Morning Rounds \u00b7 Clinical Numericals \u00b7 Summative Revision<\/title>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400;1,600&family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,400&display=swap\" rel=\"stylesheet\">\n<style>\n#ncl-sr *,#ncl-sr *::before,#ncl-sr *::after{box-sizing:border-box;margin:0;padding:0}\n#ncl-sr{\n --ob:#1A5F7A;--ob-dark:#114455;--ob-pale:#E6F3F7;--ob-mid:#236E8C;\n --ink:#0F2A35;--ink-mid:#2A4D5A;--ink-soft:#5A7D8A;\n --line:#B8D8E3;--cream:#F2F8FA;--warm:#F8FCFD;\n --correct:#2D6B47;--correct-bg:#EAF6EF;\n font-family:'Source Serif 4',Georgia,serif;\n font-size:16px;color:var(--ink);background:var(--cream);\n line-height:1.78;padding:0 0 72px;\n}\n#ncl-sr .rv-header{\n background:linear-gradient(135deg,var(--ob-dark) 0%,var(--ob) 60%,var(--ob-mid) 100%);\n color:#E4F4F9;padding:36px 24px 30px;text-align:center;\n position:relative;overflow:hidden;\n}\n#ncl-sr 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8px}\n}\n<\/style>\n\n<div id=\"ncl-sr\">\n\n <div class=\"rv-header\">\n <div class=\"rv-eyebrow\">Morning Rounds \u00b7 Numerical Series \u00b7 Clinical Physiology & Pharmacology<\/div>\n <div class=\"rv-title\">Clinical Numericals<br><em>Summative Revision Notes<\/em><\/div>\n <div class=\"rv-subtitle\">Seven rounds \u00b7 NEET-PG \/ INI-CET \/ UPSC CMS \u00b7 Formulae, normal values, traps & the Editor's Ten<\/div>\n <div class=\"rv-chips\">\n <span class=\"rv-chip\">Physiology<\/span>\n <span class=\"rv-chip\">ABG<\/span>\n <span class=\"rv-chip\">Anion Gap<\/span>\n <span class=\"rv-chip\">Fluids & Electrolytes<\/span>\n <span class=\"rv-chip\">Renal<\/span>\n <span class=\"rv-chip\">Cardiovascular<\/span>\n <span class=\"rv-chip\">Drug Calculations<\/span>\n <\/div>\n <\/div>\n\n <div class=\"rv-body\">\n\n <div class=\"rv-intro\">\n <p>These notes consolidate all seven Clinical Numericals Morning Rounds. Written for rapid pre-exam revision, not first-time learning. Each section heading links to its quiz. Track units alongside every number \u2014 that is the single habit that prevents most errors in this series.<\/p>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-01.html\">\n <div class=\"rv-sec-num\">Round 01 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Physiological Calculations <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formula Reference<\/div>\n <span class=\"rv-formula\">Cardiac Output (Fick) = VO2 \/ (CaO2 – CvO2) [units: mL\/min \/ mL\/L = L\/min]<\/span>\n <span class=\"rv-formula\">GFR (Clearance) = (U x V) \/ P [U = urine conc, V = urine flow mL\/min, P = plasma conc]<\/span>\n <span class=\"rv-formula\">Dead Space (Bohr) = VT x [(PaCO2 – PE'CO2) \/ PaCO2]<\/span>\n <span class=\"rv-formula\">Static Compliance = Tidal Volume \/ (Plateau Pressure – PEEP)<\/span>\n <span class=\"rv-formula\">Alveolar Ventilation = (VT – VD) x RR<\/span>\n\n <div class=\"rv-sub\">Normal Values<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Parameter<\/th><th>Normal range<\/th><\/tr>\n <tr><td>Cardiac output<\/td><td>4-8 L\/min<\/td><\/tr>\n <tr><td>GFR (inulin)<\/td><td>~125 mL\/min (male); ~110 mL\/min (female)<\/td><\/tr>\n <tr><td>VD\/VT ratio<\/td><td>0.20-0.35; >0.6 = severe ventilatory failure<\/td><\/tr>\n <tr><td>Static compliance<\/td><td>60-100 mL\/cmH2O; <40 = stiff lungs (ARDS)<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">PEEP must be subtracted before dividing for compliance<\/span> <span class=\"rv-pill\">Inulin: filtered, not secreted, not reabsorbed<\/span> <span class=\"rv-pill-teal\">Rapid shallow breathing: same minute ventilation, less alveolar ventilation<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-01.html\">Open Round 01<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-02.html\">\n <div class=\"rv-sec-num\">Round 02 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">ABG Interpretation & Compensation Formulae <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Compensation Formulae — All Four Disorders<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Disorder<\/th><th>Compensation formula<\/th><th>Expected change<\/th><\/tr>\n <tr><td>Resp acidosis (acute)<\/td><td>HCO3 rises 1 mEq\/L per 10 mmHg CO2 rise<\/td><td>CO2 up 20 \u2192 HCO3 = 26<\/td><\/tr>\n <tr><td>Resp acidosis (chronic)<\/td><td>HCO3 rises 3.5 mEq\/L per 10 mmHg CO2 rise<\/td><td>CO2 up 20 \u2192 HCO3 = 31<\/td><\/tr>\n <tr><td>Resp alkalosis (acute)<\/td><td>HCO3 falls 2 mEq\/L per 10 mmHg CO2 fall<\/td><td>CO2 down 12 \u2192 HCO3 = 21.6<\/td><\/tr>\n <tr><td>Resp alkalosis (chronic)<\/td><td>HCO3 falls 5 mEq\/L per 10 mmHg CO2 fall<\/td><td>CO2 down 12 \u2192 HCO3 = 18<\/td><\/tr>\n <tr><td>Met acidosis<\/td><td>Winter's: PaCO2 = (HCO3 x 1.5) + 8 \u00b12<\/td><td>HCO3 = 9 \u2192 PaCO2 = 21.5<\/td><\/tr>\n <tr><td>Met alkalosis<\/td><td>PaCO2 rises 0.7 mmHg per 1 mEq\/L HCO3 rise<\/td><td>HCO3 up 14 \u2192 PaCO2 = 49.8<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">Winter's formula: multiply HCO3 by 1.5 THEN add 8 — never skip the +8<\/span> <span class=\"rv-pill\">Met alkalosis: lung HYPOVENTILATES to retain CO2<\/span> <span class=\"rv-pill-teal\">Near-normal pH never means single simple disorder — always calculate expected compensation<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-02.html\">Open Round 02<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-03.html\">\n <div class=\"rv-sec-num\">Round 03 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Anion Gap & Mixed Acid-Base Disorders <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">AG = Na – (Cl + HCO3) Normal: 8-12 mEq\/L<\/span>\n <span class=\"rv-formula\">Corrected AG = Measured AG + 2.5 x (4 – albumin g\/dL)<\/span>\n <span class=\"rv-formula\">Delta-delta = delta-AG \/ delta-HCO3 = (AG-12) \/ (24-HCO3)<\/span>\n <span class=\"rv-formula\">Urine AG = Urine (Na + K) – Urine Cl<\/span>\n\n <div class=\"rv-sub\">Delta-Delta Interpretation<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Delta-delta ratio<\/th><th>Interpretation<\/th><\/tr>\n <tr><td><1<\/td><td>Concurrent non-AG metabolic acidosis pulling HCO3 down further<\/td><\/tr>\n <tr><td>1-2<\/td><td>Pure HAGMA — AG rise matches HCO3 fall 1:1<\/td><\/tr>\n <tr><td>>2<\/td><td>Concurrent metabolic alkalosis propping HCO3 up<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">Urine AG negative: GI cause (diarrhoea) — high NH4+ excretion<\/span> <span class=\"rv-pill\">Urine AG positive: RTA — impaired NH4+ excretion<\/span> <span class=\"rv-pill-teal\">Hypoalbuminaemia masks HAGMA — always correct AG in ICU patients<\/span> <span class=\"rv-pill-green\">MUDPILES: Methanol, Uraemia, DKA, Propylene glycol, Isoniazid\/Iron, Lactic acidosis, Ethylene glycol, Salicylates<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-03.html\">Open Round 03<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-04.html\">\n <div class=\"rv-sec-num\">Round 04 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Fluids & Electrolytes <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">Serum Osmolality = 2xNa + Glucose\/18 + BUN\/2.8 Normal: 275-295 mOsm\/kg<\/span>\n <span class=\"rv-formula\">Osmol Gap = Measured Osm – Calculated Osm Normal: <10 mOsm\/kg<\/span>\n <span class=\"rv-formula\">Corrected Na (hyperglycaemia) = Measured Na + 1.6 x [(Glucose-100)\/100]<\/span>\n <span class=\"rv-formula\">Free Water Deficit = TBW x [(Na measured\/140) – 1] TBW = 0.6 x wt (male), 0.5 x wt (female)<\/span>\n\n <div class=\"rv-sub\">Key Clinical Rules<\/div>\n <p>Elevated osmol gap (>10): toxic alcohols — methanol, ethylene glycol, ethanol, isopropanol. May precede AG elevation. <strong>Hypernatraemia correction: no faster than 0.5 mEq\/L\/hour or 10-12 mEq\/L\/day.<\/strong> Rapid correction causes cerebral oedema. Hyponatraemia correction: no faster than 8-10 mEq\/L\/day (risk of osmotic demyelination).<\/p>\n <p><span class=\"rv-pill\">Serum K in DKA: normal or high despite total body depletion<\/span> <span class=\"rv-pill\">K falls after treatment: acidosis correction + insulin + osmotic diuresis<\/span> <span class=\"rv-pill-teal\">Translocational hyponatraemia: water moves out, not sodium — corrects with glucose<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-04.html\">Open Round 04<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-05.html\">\n <div class=\"rv-sec-num\">Round 05 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Renal Calculations <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">CrCl (Cockcroft-Gault) = [(140-age) x weight] \/ (72 x Cr) x 0.85 (female)<\/span>\n <span class=\"rv-formula\">FENa = [(UNa\/SNa) \/ (UCr\/SCr)] x 100<\/span>\n <span class=\"rv-formula\">Filtration Fraction = GFR \/ RPF Normal: 15-20%<\/span>\n <span class=\"rv-formula\">24-hr protein estimate = Spot PCR (g\/g) x 1 g\/day creatinine<\/span>\n\n <div class=\"rv-sub\">AKI Classification by Urine Indices<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Index<\/th><th>Pre-renal<\/th><th>Intrinsic (ATN)<\/th><\/tr>\n <tr><td>FENa<\/td><td><1%<\/td><td>>2%<\/td><\/tr>\n <tr><td>Urine Na<\/td><td><20 mEq\/L<\/td><td>>40 mEq\/L<\/td><\/tr>\n <tr><td>Urine Osm<\/td><td>>500 mOsm\/kg<\/td><td>250-350 (isosthenuric)<\/td><\/tr>\n <tr><td>U:P Cr ratio<\/td><td>>40<\/td><td><20<\/td><\/tr>\n <\/table>\n <\/div>\n <p><strong>FENa exceptions:<\/strong> low FENa (<1%) despite intrinsic AKI in contrast nephropathy, myoglobinuria, haemoglobinuria, hepatorenal syndrome, early obstruction. <strong>Nephrotic syndrome requires all four:<\/strong> proteinuria >3.5 g\/day + hypoalbuminaemia + oedema + hyperlipidaemia. Proteinuria alone = nephrotic-range, not nephrotic syndrome.<\/p>\n <p><span class=\"rv-pill\">FF rises in renal artery stenosis: efferent constriction preserves GFR as RPF falls<\/span> <span class=\"rv-pill-teal\">ACEi in bilateral RAS: dilates efferent arteriole, abolishes compensation, GFR crashes<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-05.html\">Open Round 05<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-06.html\">\n <div class=\"rv-sec-num\">Round 06 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Cardiovascular Calculations <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">MAP = DBP + (1\/3 x Pulse Pressure) = (SBP + 2xDBP) \/ 3 Target in sepsis: >=65 mmHg<\/span>\n <span class=\"rv-formula\">SVR = [(MAP – CVP) \/ CO] x 80 Normal: 800-1200 dynes\/sec\/cm5<\/span>\n <span class=\"rv-formula\">Stroke Volume = EDV – ESV Ejection Fraction = SV\/EDV x 100 Normal EF: 55-70%<\/span>\n <span class=\"rv-formula\">Cardiac Index = CO \/ BSA Normal: 2.5-4.0 L\/min\/m2; cardiogenic shock: <2.2<\/span>\n\n <div class=\"rv-sub\">Shock Haemodynamic Patterns<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Shock type<\/th><th>CO\/CI<\/th><th>SVR<\/th><th>Example<\/th><\/tr>\n <tr><td>Distributive<\/td><td>High<\/td><td>Low<\/td><td>Sepsis, anaphylaxis, neurogenic<\/td><\/tr>\n <tr><td>Cardiogenic<\/td><td>Low<\/td><td>High<\/td><td>MI, acute HF<\/td><\/tr>\n <tr><td>Hypovolaemic<\/td><td>Low<\/td><td>High<\/td><td>Haemorrhage, dehydration<\/td><\/tr>\n <tr><td>Obstructive<\/td><td>Low<\/td><td>High<\/td><td>Massive PE, tamponade<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">Widened PP: AR, thyrotoxicosis, anaemia, AV fistula — raised SV or reduced diastolic runoff<\/span> <span class=\"rv-pill\">Narrow PP: tamponade, severe AS, cardiogenic shock<\/span> <span class=\"rv-pill-teal\">SVR x80 converts Wood units to dynes\/sec\/cm5 — never omit this factor<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-06.html\">Open Round 06<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-07.html\">\n <div class=\"rv-sec-num\">Round 07 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Clinical Drug Calculations <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">Drip rate (drops\/min) = [Volume (mL) x Drop factor] \/ Time (minutes)<\/span>\n <span class=\"rv-formula\">Volume per dose = (Dose required \/ Stock concentration) x Stock volume<\/span>\n\n <div class=\"rv-sub\">The Five-Step Infusion Method — Apply to Every Weight-Based Infusion<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Step<\/th><th>Action<\/th><th>Example (dopamine 5 mcg\/kg\/min, 70 kg, 200 mg\/250 mL)<\/th><\/tr>\n <tr><td>1<\/td><td>Dose needed<\/td><td>5 x 70 = 350 mcg\/min<\/td><\/tr>\n <tr><td>2<\/td><td>Convert units<\/td><td>350 mcg\/min \/ 1000 = 0.35 mg\/min<\/td><\/tr>\n <tr><td>3<\/td><td>Solution conc<\/td><td>200 mg \/ 250 mL = 0.8 mg\/mL<\/td><\/tr>\n <tr><td>4<\/td><td>Volume rate<\/td><td>0.35 \/ 0.8 = 0.4375 mL\/min<\/td><\/tr>\n <tr><td>5<\/td><td>Convert time<\/td><td>0.4375 x 60 = 26.25 mL\/hr<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">Drop factor 20: standard adult set; drop factor 60: microdrip\/paediatric<\/span> <span class=\"rv-pill\">Time in MINUTES for drip rate — convert hours first<\/span> <span class=\"rv-pill-teal\">Insulin 0.1 units\/kg\/hr in 70 kg \/ 100 units\/mL = 0.06 mL\/hr — correct despite appearing small<\/span> <span class=\"rv-pill-green\">Aminophylline: halve or omit loading dose if patient already on theophylline — NTI drug<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-07.html\">Open Round 07<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-editors-ten\">\n <div class=\"rv-editors-head\">\n <div class=\"rv-editors-eyebrow\">Curated Selection \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-editors-title\">Editor's Ten — Questions Worth Returning To<\/div>\n <\/div>\n <div class=\"rv-editors-body\">\n <p>Ten questions from across the series, selected because either the question itself or its debrief explanation is foundational enough that owning it changes how you approach an entire topic. At least one from each round. Exam relevance is the primary criterion.<\/p>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R1 Q1<\/div>\n <div>\n <div class=\"rv-ten-label\">Fick Principle — Cardiac Output<\/div>\n <div class=\"rv-ten-why\">The foundational formula of haemodynamics. The units trap (mL\/min divided by mL\/L gives L\/min) is the same unit-cancellation logic that runs through every calculation in Rounds 06 and 07. Miss this and every downstream formula is on shakier ground.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R1 Q5<\/div>\n <div>\n <div class=\"rv-ten-label\">Alveolar Ventilation — Rapid Shallow Breathing Trap<\/div>\n <div class=\"rv-ten-why\">The embedded calculation showing that increasing RR from 16 to 32 while halving tidal volume maintains minute ventilation but reduces alveolar ventilation from 5600 to 3200 mL\/min is the physiological reason why rapid shallow breathing is dangerous. Directly examined in anaesthesia and critical care questions.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R2 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">Winter's Formula — The +8 Step<\/div>\n <div class=\"rv-ten-why\">Expected PaCO2 = (HCO3 x 1.5) + 8 is the only simple numerical formula for any compensation calculation. Omitting the +8 produces a PaCO2 of 13.5 instead of 21.5 — making a well-compensated metabolic acidosis look like it has a superimposed respiratory acidosis. This error is common enough that it is tested by design.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R2 Q5<\/div>\n <div>\n <div class=\"rv-ten-label\">Triple Disorder — pH 7.42 Hiding Three Processes<\/div>\n <div class=\"rv-ten-why\">The series' central clinical lesson: a near-normal pH is not a licence to stop the analysis. Sepsis plus vomiting produces respiratory alkalosis, high-AG metabolic acidosis, and metabolic alkalosis simultaneously, each nearly cancelling the others. Without calculating expected compensation and checking the delta-delta ratio, all three are invisible.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R3 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">Albumin Correction — Masked HAGMA in ICU Patients<\/div>\n <div class=\"rv-ten-why\">A measured AG of 16 in a patient with albumin of 1.5 g\/dL corrects to 22.5 — a true elevated AG process hidden entirely. In critically ill, malnourished, or hypoalbuminaemic patients, the uncorrected AG routinely underestimates severity. This is not a theoretical trap; it is a daily ward error.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R4 Q5<\/div>\n <div>\n <div class=\"rv-ten-label\">Potassium in DKA — Normal Serum K Hiding Total Body Depletion<\/div>\n <div class=\"rv-ten-why\">Serum K of 5.5 mEq\/L on DKA admission masks profound total body depletion. Three mechanisms drive the fall after treatment begins: acidosis correction, insulin, and osmotic diuresis. Knowing this prevents the catastrophic error of not replacing potassium early because the serum level looks adequate.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R5 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">FENa — Exceptions Where Low FENa Does Not Mean Pre-renal<\/div>\n <div class=\"rv-ten-why\">FENa less than 1% is not a reliable pre-renal marker in contrast nephropathy, myoglobinuria, haemoglobinuria, hepatorenal syndrome, or early obstruction. Examiners test this directly. The clinical consequence of misclassifying intrinsic AKI as pre-renal and continuing aggressive fluid loading is renal and pulmonary harm.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R5 Q5<\/div>\n <div>\n <div class=\"rv-ten-label\">Nephrotic-Range Proteinuria vs Nephrotic Syndrome<\/div>\n <div class=\"rv-ten-why\">Proteinuria above 3.5 g\/day is nephrotic-range proteinuria, not nephrotic syndrome — which requires the full tetrad of proteinuria, hypoalbuminaemia, oedema, and hyperlipidaemia. This distinction is tested directly and its practical importance is high: treatment decisions, biopsy indications, and prognosis differ between the two labels.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R6 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">SVR — Shock Haemodynamic Patterns<\/div>\n <div class=\"rv-ten-why\">SVR = [(MAP-CVP)\/CO] x 80 with the four shock patterns placed side by side: distributive (high CO, low SVR) versus the three low-CO patterns (cardiogenic, hypovolaemic, obstructive each with high SVR). This is the most-examined haemodynamic framework in critical care and anaesthesia MCQs, and the x80 conversion is the most commonly omitted step.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R7 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">Dopamine Infusion — The Five-Step Method<\/div>\n <div class=\"rv-ten-why\">The five-step method (dose needed, unit conversion, solution concentration, volume rate, time conversion) is not specific to dopamine — it applies to every weight-based infusion question regardless of drug. Candidates who internalise this sequence as a single procedure answer infusion questions reliably; those who attempt them ad hoc produce unit errors on approximately half.<\/div>\n <\/div>\n <\/div>\n\n <\/div>\n <\/div>\n\n \n <div class=\"rv-footer\">\n Clinical Numericals Summative Revision \u00b7 atsixty.com \u00b7 Morning Rounds \u00b7 Numerical Series<br>\n <a href=\"mr-ncl-index.html\">← Return to Clinical Numericals Series Index<\/a>\n <\/div>\n\n <\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Morning Rounds \u00b7 Clinical Numericals \u00b7 Summative Revision Morning Rounds \u00b7 Numerical Series \u00b7 Clinical Physiology & Pharmacology Clinical NumericalsSummative Revision Notes Seven rounds \u00b7 NEET-PG \/ INI-CET \/ UPSC CMS \u00b7 Formulae, normal values, traps & the Editor's Ten Physiology ABG Anion Gap Fluids & Electrolytes Renal Cardiovascular Drug Calculations These notes consolidate all… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[98,79],"tags":[83],"class_list":["post-37439","post","type-post","status-publish","format-standard","hentry","category-numericals","category-pharmacology","tag-neet-pg"],"yoast_head":"\n<title>Physiology & Pharmacology Calculations - 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.rv-editors-head{background:#D6F0EA;padding:14px 20px 12px;border-bottom:1px solid #8ECFBB}\n#ncl-sr .rv-editors-eyebrow{font-size:0.61rem;font-weight:700;letter-spacing:0.14em;text-transform:uppercase;color:#114A3A;margin-bottom:3px}\n#ncl-sr .rv-editors-title{font-family:'Playfair Display',serif;font-size:1.15rem;font-weight:700;color:#114A3A}\n#ncl-sr .rv-editors-body{padding:16px 20px 18px}\n#ncl-sr .rv-editors-body p{font-size:0.88rem;color:var(--ink-mid);line-height:1.72;margin-bottom:10px}\n#ncl-sr .rv-ten-row{display:flex;gap:12px;padding:9px 0;border-bottom:1px solid var(--line);align-items:flex-start}\n#ncl-sr .rv-ten-row:last-child{border-bottom:none}\n#ncl-sr .rv-ten-tag{flex-shrink:0;width:64px;font-family:'Playfair Display',serif;font-size:0.82rem;font-weight:700;color:var(--ob);padding-top:2px}\n#ncl-sr .rv-ten-label{font-size:0.88rem;font-weight:600;color:var(--ink);margin-bottom:2px}\n#ncl-sr .rv-ten-why{font-size:0.82rem;color:var(--ink-mid);line-height:1.6}\n#ncl-sr .rv-footer{margin-top:32px;text-align:center;font-size:0.80rem;color:var(--ink-soft);font-style:italic;line-height:1.6}\n#ncl-sr .rv-footer a{color:var(--ob);font-style:normal;font-weight:600;text-decoration:none;border-bottom:1px solid var(--ob)}\n#ncl-sr .rv-footer a:hover{opacity:0.75}\n@media print{\n #ncl-sr .rv-header{background:#1A5F7A !important;-webkit-print-color-adjust:exact}\n #ncl-sr{padding-bottom:20px}\n #ncl-sr .rv-section{break-inside:avoid;box-shadow:none}\n}\n@media(max-width:480px){\n #ncl-sr .rv-title{font-size:1.45rem}\n #ncl-sr .rv-sec-title{font-size:1rem}\n #ncl-sr table{font-size:0.76rem}\n #ncl-sr td,#ncl-sr th{padding:6px 8px}\n}\n<\/style>\n\n<div id=\"ncl-sr\">\n\n <div class=\"rv-header\">\n <div class=\"rv-eyebrow\">Morning Rounds \u00b7 Numerical Series \u00b7 Clinical Physiology & Pharmacology<\/div>\n <div class=\"rv-title\">Clinical Numericals<br><em>Summative Revision Notes<\/em><\/div>\n <div class=\"rv-subtitle\">Seven rounds \u00b7 NEET-PG \/ INI-CET \/ UPSC CMS \u00b7 Formulae, normal values, traps & the Editor's Ten<\/div>\n <div class=\"rv-chips\">\n <span class=\"rv-chip\">Physiology<\/span>\n <span class=\"rv-chip\">ABG<\/span>\n <span class=\"rv-chip\">Anion Gap<\/span>\n <span class=\"rv-chip\">Fluids & Electrolytes<\/span>\n <span class=\"rv-chip\">Renal<\/span>\n <span class=\"rv-chip\">Cardiovascular<\/span>\n <span class=\"rv-chip\">Drug Calculations<\/span>\n <\/div>\n <\/div>\n\n <div class=\"rv-body\">\n\n <div class=\"rv-intro\">\n <p>These notes consolidate all seven Clinical Numericals Morning Rounds. Written for rapid pre-exam revision, not first-time learning. Each section heading links to its quiz. Track units alongside every number \u2014 that is the single habit that prevents most errors in this series.<\/p>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-01.html\">\n <div class=\"rv-sec-num\">Round 01 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Physiological Calculations <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formula Reference<\/div>\n <span class=\"rv-formula\">Cardiac Output (Fick) = VO2 \/ (CaO2 – CvO2) [units: mL\/min \/ mL\/L = L\/min]<\/span>\n <span class=\"rv-formula\">GFR (Clearance) = (U x V) \/ P [U = urine conc, V = urine flow mL\/min, P = plasma conc]<\/span>\n <span class=\"rv-formula\">Dead Space (Bohr) = VT x [(PaCO2 – PE'CO2) \/ PaCO2]<\/span>\n <span class=\"rv-formula\">Static Compliance = Tidal Volume \/ (Plateau Pressure – PEEP)<\/span>\n <span class=\"rv-formula\">Alveolar Ventilation = (VT – VD) x RR<\/span>\n\n <div class=\"rv-sub\">Normal Values<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Parameter<\/th><th>Normal range<\/th><\/tr>\n <tr><td>Cardiac output<\/td><td>4-8 L\/min<\/td><\/tr>\n <tr><td>GFR (inulin)<\/td><td>~125 mL\/min (male); ~110 mL\/min (female)<\/td><\/tr>\n <tr><td>VD\/VT ratio<\/td><td>0.20-0.35; >0.6 = severe ventilatory failure<\/td><\/tr>\n <tr><td>Static compliance<\/td><td>60-100 mL\/cmH2O; <40 = stiff lungs (ARDS)<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">PEEP must be subtracted before dividing for compliance<\/span> <span class=\"rv-pill\">Inulin: filtered, not secreted, not reabsorbed<\/span> <span class=\"rv-pill-teal\">Rapid shallow breathing: same minute ventilation, less alveolar ventilation<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-01.html\">Open Round 01<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-02.html\">\n <div class=\"rv-sec-num\">Round 02 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">ABG Interpretation & Compensation Formulae <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Compensation Formulae — All Four Disorders<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Disorder<\/th><th>Compensation formula<\/th><th>Expected change<\/th><\/tr>\n <tr><td>Resp acidosis (acute)<\/td><td>HCO3 rises 1 mEq\/L per 10 mmHg CO2 rise<\/td><td>CO2 up 20 \u2192 HCO3 = 26<\/td><\/tr>\n <tr><td>Resp acidosis (chronic)<\/td><td>HCO3 rises 3.5 mEq\/L per 10 mmHg CO2 rise<\/td><td>CO2 up 20 \u2192 HCO3 = 31<\/td><\/tr>\n <tr><td>Resp alkalosis (acute)<\/td><td>HCO3 falls 2 mEq\/L per 10 mmHg CO2 fall<\/td><td>CO2 down 12 \u2192 HCO3 = 21.6<\/td><\/tr>\n <tr><td>Resp alkalosis (chronic)<\/td><td>HCO3 falls 5 mEq\/L per 10 mmHg CO2 fall<\/td><td>CO2 down 12 \u2192 HCO3 = 18<\/td><\/tr>\n <tr><td>Met acidosis<\/td><td>Winter's: PaCO2 = (HCO3 x 1.5) + 8 \u00b12<\/td><td>HCO3 = 9 \u2192 PaCO2 = 21.5<\/td><\/tr>\n <tr><td>Met alkalosis<\/td><td>PaCO2 rises 0.7 mmHg per 1 mEq\/L HCO3 rise<\/td><td>HCO3 up 14 \u2192 PaCO2 = 49.8<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">Winter's formula: multiply HCO3 by 1.5 THEN add 8 — never skip the +8<\/span> <span class=\"rv-pill\">Met alkalosis: lung HYPOVENTILATES to retain CO2<\/span> <span class=\"rv-pill-teal\">Near-normal pH never means single simple disorder — always calculate expected compensation<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-02.html\">Open Round 02<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-03.html\">\n <div class=\"rv-sec-num\">Round 03 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Anion Gap & Mixed Acid-Base Disorders <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">AG = Na – (Cl + HCO3) Normal: 8-12 mEq\/L<\/span>\n <span class=\"rv-formula\">Corrected AG = Measured AG + 2.5 x (4 – albumin g\/dL)<\/span>\n <span class=\"rv-formula\">Delta-delta = delta-AG \/ delta-HCO3 = (AG-12) \/ (24-HCO3)<\/span>\n <span class=\"rv-formula\">Urine AG = Urine (Na + K) – Urine Cl<\/span>\n\n <div class=\"rv-sub\">Delta-Delta Interpretation<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Delta-delta ratio<\/th><th>Interpretation<\/th><\/tr>\n <tr><td><1<\/td><td>Concurrent non-AG metabolic acidosis pulling HCO3 down further<\/td><\/tr>\n <tr><td>1-2<\/td><td>Pure HAGMA — AG rise matches HCO3 fall 1:1<\/td><\/tr>\n <tr><td>>2<\/td><td>Concurrent metabolic alkalosis propping HCO3 up<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">Urine AG negative: GI cause (diarrhoea) — high NH4+ excretion<\/span> <span class=\"rv-pill\">Urine AG positive: RTA — impaired NH4+ excretion<\/span> <span class=\"rv-pill-teal\">Hypoalbuminaemia masks HAGMA — always correct AG in ICU patients<\/span> <span class=\"rv-pill-green\">MUDPILES: Methanol, Uraemia, DKA, Propylene glycol, Isoniazid\/Iron, Lactic acidosis, Ethylene glycol, Salicylates<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-03.html\">Open Round 03<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-04.html\">\n <div class=\"rv-sec-num\">Round 04 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Fluids & Electrolytes <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">Serum Osmolality = 2xNa + Glucose\/18 + BUN\/2.8 Normal: 275-295 mOsm\/kg<\/span>\n <span class=\"rv-formula\">Osmol Gap = Measured Osm – Calculated Osm Normal: <10 mOsm\/kg<\/span>\n <span class=\"rv-formula\">Corrected Na (hyperglycaemia) = Measured Na + 1.6 x [(Glucose-100)\/100]<\/span>\n <span class=\"rv-formula\">Free Water Deficit = TBW x [(Na measured\/140) – 1] TBW = 0.6 x wt (male), 0.5 x wt (female)<\/span>\n\n <div class=\"rv-sub\">Key Clinical Rules<\/div>\n <p>Elevated osmol gap (>10): toxic alcohols — methanol, ethylene glycol, ethanol, isopropanol. May precede AG elevation. <strong>Hypernatraemia correction: no faster than 0.5 mEq\/L\/hour or 10-12 mEq\/L\/day.<\/strong> Rapid correction causes cerebral oedema. Hyponatraemia correction: no faster than 8-10 mEq\/L\/day (risk of osmotic demyelination).<\/p>\n <p><span class=\"rv-pill\">Serum K in DKA: normal or high despite total body depletion<\/span> <span class=\"rv-pill\">K falls after treatment: acidosis correction + insulin + osmotic diuresis<\/span> <span class=\"rv-pill-teal\">Translocational hyponatraemia: water moves out, not sodium — corrects with glucose<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-04.html\">Open Round 04<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-05.html\">\n <div class=\"rv-sec-num\">Round 05 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Renal Calculations <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">CrCl (Cockcroft-Gault) = [(140-age) x weight] \/ (72 x Cr) x 0.85 (female)<\/span>\n <span class=\"rv-formula\">FENa = [(UNa\/SNa) \/ (UCr\/SCr)] x 100<\/span>\n <span class=\"rv-formula\">Filtration Fraction = GFR \/ RPF Normal: 15-20%<\/span>\n <span class=\"rv-formula\">24-hr protein estimate = Spot PCR (g\/g) x 1 g\/day creatinine<\/span>\n\n <div class=\"rv-sub\">AKI Classification by Urine Indices<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Index<\/th><th>Pre-renal<\/th><th>Intrinsic (ATN)<\/th><\/tr>\n <tr><td>FENa<\/td><td><1%<\/td><td>>2%<\/td><\/tr>\n <tr><td>Urine Na<\/td><td><20 mEq\/L<\/td><td>>40 mEq\/L<\/td><\/tr>\n <tr><td>Urine Osm<\/td><td>>500 mOsm\/kg<\/td><td>250-350 (isosthenuric)<\/td><\/tr>\n <tr><td>U:P Cr ratio<\/td><td>>40<\/td><td><20<\/td><\/tr>\n <\/table>\n <\/div>\n <p><strong>FENa exceptions:<\/strong> low FENa (<1%) despite intrinsic AKI in contrast nephropathy, myoglobinuria, haemoglobinuria, hepatorenal syndrome, early obstruction. <strong>Nephrotic syndrome requires all four:<\/strong> proteinuria >3.5 g\/day + hypoalbuminaemia + oedema + hyperlipidaemia. Proteinuria alone = nephrotic-range, not nephrotic syndrome.<\/p>\n <p><span class=\"rv-pill\">FF rises in renal artery stenosis: efferent constriction preserves GFR as RPF falls<\/span> <span class=\"rv-pill-teal\">ACEi in bilateral RAS: dilates efferent arteriole, abolishes compensation, GFR crashes<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-05.html\">Open Round 05<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-06.html\">\n <div class=\"rv-sec-num\">Round 06 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Cardiovascular Calculations <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">MAP = DBP + (1\/3 x Pulse Pressure) = (SBP + 2xDBP) \/ 3 Target in sepsis: >=65 mmHg<\/span>\n <span class=\"rv-formula\">SVR = [(MAP – CVP) \/ CO] x 80 Normal: 800-1200 dynes\/sec\/cm5<\/span>\n <span class=\"rv-formula\">Stroke Volume = EDV – ESV Ejection Fraction = SV\/EDV x 100 Normal EF: 55-70%<\/span>\n <span class=\"rv-formula\">Cardiac Index = CO \/ BSA Normal: 2.5-4.0 L\/min\/m2; cardiogenic shock: <2.2<\/span>\n\n <div class=\"rv-sub\">Shock Haemodynamic Patterns<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Shock type<\/th><th>CO\/CI<\/th><th>SVR<\/th><th>Example<\/th><\/tr>\n <tr><td>Distributive<\/td><td>High<\/td><td>Low<\/td><td>Sepsis, anaphylaxis, neurogenic<\/td><\/tr>\n <tr><td>Cardiogenic<\/td><td>Low<\/td><td>High<\/td><td>MI, acute HF<\/td><\/tr>\n <tr><td>Hypovolaemic<\/td><td>Low<\/td><td>High<\/td><td>Haemorrhage, dehydration<\/td><\/tr>\n <tr><td>Obstructive<\/td><td>Low<\/td><td>High<\/td><td>Massive PE, tamponade<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">Widened PP: AR, thyrotoxicosis, anaemia, AV fistula — raised SV or reduced diastolic runoff<\/span> <span class=\"rv-pill\">Narrow PP: tamponade, severe AS, cardiogenic shock<\/span> <span class=\"rv-pill-teal\">SVR x80 converts Wood units to dynes\/sec\/cm5 — never omit this factor<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-06.html\">Open Round 06<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-section\">\n <div class=\"rv-sec-head\">\n <a href=\"mr-ncl-07.html\">\n <div class=\"rv-sec-num\">Round 07 \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-sec-title\">Clinical Drug Calculations <span class=\"rv-arrow\">\u2197<\/span><\/div>\n <\/a>\n <\/div>\n <div class=\"rv-sec-body\">\n <div class=\"rv-sub\">Formulae<\/div>\n <span class=\"rv-formula\">Drip rate (drops\/min) = [Volume (mL) x Drop factor] \/ Time (minutes)<\/span>\n <span class=\"rv-formula\">Volume per dose = (Dose required \/ Stock concentration) x Stock volume<\/span>\n\n <div class=\"rv-sub\">The Five-Step Infusion Method — Apply to Every Weight-Based Infusion<\/div>\n <div class=\"rv-table-wrap\">\n <table>\n <tr><th>Step<\/th><th>Action<\/th><th>Example (dopamine 5 mcg\/kg\/min, 70 kg, 200 mg\/250 mL)<\/th><\/tr>\n <tr><td>1<\/td><td>Dose needed<\/td><td>5 x 70 = 350 mcg\/min<\/td><\/tr>\n <tr><td>2<\/td><td>Convert units<\/td><td>350 mcg\/min \/ 1000 = 0.35 mg\/min<\/td><\/tr>\n <tr><td>3<\/td><td>Solution conc<\/td><td>200 mg \/ 250 mL = 0.8 mg\/mL<\/td><\/tr>\n <tr><td>4<\/td><td>Volume rate<\/td><td>0.35 \/ 0.8 = 0.4375 mL\/min<\/td><\/tr>\n <tr><td>5<\/td><td>Convert time<\/td><td>0.4375 x 60 = 26.25 mL\/hr<\/td><\/tr>\n <\/table>\n <\/div>\n <p><span class=\"rv-pill\">Drop factor 20: standard adult set; drop factor 60: microdrip\/paediatric<\/span> <span class=\"rv-pill\">Time in MINUTES for drip rate — convert hours first<\/span> <span class=\"rv-pill-teal\">Insulin 0.1 units\/kg\/hr in 70 kg \/ 100 units\/mL = 0.06 mL\/hr — correct despite appearing small<\/span> <span class=\"rv-pill-green\">Aminophylline: halve or omit loading dose if patient already on theophylline — NTI drug<\/span><\/p>\n <div class=\"rv-quiz-wrap\"><a class=\"rv-quiz-link\" href=\"mr-ncl-07.html\">Open Round 07<\/a><\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"rv-editors-ten\">\n <div class=\"rv-editors-head\">\n <div class=\"rv-editors-eyebrow\">Curated Selection \u00b7 Clinical Numericals Series<\/div>\n <div class=\"rv-editors-title\">Editor's Ten — Questions Worth Returning To<\/div>\n <\/div>\n <div class=\"rv-editors-body\">\n <p>Ten questions from across the series, selected because either the question itself or its debrief explanation is foundational enough that owning it changes how you approach an entire topic. At least one from each round. Exam relevance is the primary criterion.<\/p>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R1 Q1<\/div>\n <div>\n <div class=\"rv-ten-label\">Fick Principle — Cardiac Output<\/div>\n <div class=\"rv-ten-why\">The foundational formula of haemodynamics. The units trap (mL\/min divided by mL\/L gives L\/min) is the same unit-cancellation logic that runs through every calculation in Rounds 06 and 07. Miss this and every downstream formula is on shakier ground.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R1 Q5<\/div>\n <div>\n <div class=\"rv-ten-label\">Alveolar Ventilation — Rapid Shallow Breathing Trap<\/div>\n <div class=\"rv-ten-why\">The embedded calculation showing that increasing RR from 16 to 32 while halving tidal volume maintains minute ventilation but reduces alveolar ventilation from 5600 to 3200 mL\/min is the physiological reason why rapid shallow breathing is dangerous. Directly examined in anaesthesia and critical care questions.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R2 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">Winter's Formula — The +8 Step<\/div>\n <div class=\"rv-ten-why\">Expected PaCO2 = (HCO3 x 1.5) + 8 is the only simple numerical formula for any compensation calculation. Omitting the +8 produces a PaCO2 of 13.5 instead of 21.5 — making a well-compensated metabolic acidosis look like it has a superimposed respiratory acidosis. This error is common enough that it is tested by design.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R2 Q5<\/div>\n <div>\n <div class=\"rv-ten-label\">Triple Disorder — pH 7.42 Hiding Three Processes<\/div>\n <div class=\"rv-ten-why\">The series' central clinical lesson: a near-normal pH is not a licence to stop the analysis. Sepsis plus vomiting produces respiratory alkalosis, high-AG metabolic acidosis, and metabolic alkalosis simultaneously, each nearly cancelling the others. Without calculating expected compensation and checking the delta-delta ratio, all three are invisible.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R3 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">Albumin Correction — Masked HAGMA in ICU Patients<\/div>\n <div class=\"rv-ten-why\">A measured AG of 16 in a patient with albumin of 1.5 g\/dL corrects to 22.5 — a true elevated AG process hidden entirely. In critically ill, malnourished, or hypoalbuminaemic patients, the uncorrected AG routinely underestimates severity. This is not a theoretical trap; it is a daily ward error.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R4 Q5<\/div>\n <div>\n <div class=\"rv-ten-label\">Potassium in DKA — Normal Serum K Hiding Total Body Depletion<\/div>\n <div class=\"rv-ten-why\">Serum K of 5.5 mEq\/L on DKA admission masks profound total body depletion. Three mechanisms drive the fall after treatment begins: acidosis correction, insulin, and osmotic diuresis. Knowing this prevents the catastrophic error of not replacing potassium early because the serum level looks adequate.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R5 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">FENa — Exceptions Where Low FENa Does Not Mean Pre-renal<\/div>\n <div class=\"rv-ten-why\">FENa less than 1% is not a reliable pre-renal marker in contrast nephropathy, myoglobinuria, haemoglobinuria, hepatorenal syndrome, or early obstruction. Examiners test this directly. The clinical consequence of misclassifying intrinsic AKI as pre-renal and continuing aggressive fluid loading is renal and pulmonary harm.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R5 Q5<\/div>\n <div>\n <div class=\"rv-ten-label\">Nephrotic-Range Proteinuria vs Nephrotic Syndrome<\/div>\n <div class=\"rv-ten-why\">Proteinuria above 3.5 g\/day is nephrotic-range proteinuria, not nephrotic syndrome — which requires the full tetrad of proteinuria, hypoalbuminaemia, oedema, and hyperlipidaemia. This distinction is tested directly and its practical importance is high: treatment decisions, biopsy indications, and prognosis differ between the two labels.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R6 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">SVR — Shock Haemodynamic Patterns<\/div>\n <div class=\"rv-ten-why\">SVR = [(MAP-CVP)\/CO] x 80 with the four shock patterns placed side by side: distributive (high CO, low SVR) versus the three low-CO patterns (cardiogenic, hypovolaemic, obstructive each with high SVR). This is the most-examined haemodynamic framework in critical care and anaesthesia MCQs, and the x80 conversion is the most commonly omitted step.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"rv-ten-row\">\n <div class=\"rv-ten-tag\">R7 Q2<\/div>\n <div>\n <div class=\"rv-ten-label\">Dopamine Infusion — The Five-Step Method<\/div>\n <div class=\"rv-ten-why\">The five-step method (dose needed, unit conversion, solution concentration, volume rate, time conversion) is not specific to dopamine — it applies to every weight-based infusion question regardless of drug. Candidates who internalise this sequence as a single procedure answer infusion questions reliably; those who attempt them ad hoc produce unit errors on approximately half.<\/div>\n <\/div>\n <\/div>\n\n <\/div>\n <\/div>\n\n \n <div class=\"rv-footer\">\n Clinical Numericals Summative Revision \u00b7 atsixty.com \u00b7 Morning Rounds \u00b7 Numerical Series<br>\n <a href=\"mr-ncl-index.html\">← Return to Clinical Numericals Series Index<\/a>\n <\/div>\n\n <\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Morning Rounds \u00b7 Clinical Numericals \u00b7 Summative Revision Morning Rounds \u00b7 Numerical Series \u00b7 Clinical Physiology & Pharmacology Clinical NumericalsSummative Revision Notes Seven rounds \u00b7 NEET-PG \/ INI-CET \/ UPSC CMS \u00b7 Formulae, normal values, traps & the Editor's Ten Physiology ABG Anion Gap Fluids & Electrolytes Renal Cardiovascular Drug Calculations These notes consolidate all… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[98,79],"tags":[83],"class_list":["post-37439","post","type-post","status-publish","format-standard","hentry","category-numericals","category-pharmacology","tag-neet-pg"],"yoast_head":"\n<title>Physiology & Pharmacology Calculations - 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