{"id":37010,"date":"2026-06-10T18:41:36","date_gmt":"2026-06-10T13:11:36","guid":{"rendered":"https:\/\/atsixty.com\/?p=37010"},"modified":"2026-06-10T18:42:20","modified_gmt":"2026-06-10T13:12:20","slug":"respiratory-pharmacology","status":"publish","type":"post","link":"https:\/\/atsixty.com\/index.php\/cms\/respiratory-pharmacology\/","title":{"rendered":"Respiratory Pharmacology"},"content":{"rendered":"\n\n\n<!-- BOLUS \u00b7 Respiratory Pharmacology \u00b7 Raju -->\n<div id=\"bolus03\" style=\"font-family:'Segoe UI',Arial,sans-serif;max-width:620px;margin:0 auto;padding:8px 4px;\">\n\n<style>\n#bolus03 *{box-sizing:border-box;}\n\n#bolus03 .bl-header{\n  background:linear-gradient(135deg,#1565C0 0%,#1976D2 60%,#1E88E5 100%);\n  border-radius:10px;\n  padding:18px 20px 15px;\n  margin-bottom:16px;\n  text-align:center;\n  width:100%;\n  display:block;\n  box-shadow:0 2px 8px rgba(21,101,192,0.18);\n}\n#bolus03 .bl-header .bl-topic{\n  font-size:0.7rem;\n  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.bl-next.show{display:inline-block;}\n#bolus03 .bl-next:hover{background:#0d47a1;}\n\n#bolus03 .bl-result{display:none;text-align:center;padding:22px 8px;}\n#bolus03 .bl-result.show{display:block;}\n#bolus03 .bl-result h3{font-size:1.1rem;color:#1565C0;margin-bottom:4px;}\n#bolus03 .bl-result .bl-end-tag{\n  font-size:0.84rem;color:#555;\n  font-style:italic;margin-bottom:18px;\n  line-height:1.5;\n}\n#bolus03 .bl-score-big{\n  font-size:2.8rem;font-weight:700;\n  color:#1a1a2e;line-height:1;\n}\n#bolus03 .bl-score-sub{font-size:0.8rem;color:#aaa;margin-top:3px;}\n#bolus03 .bl-score-detail{\n  margin-top:14px;font-size:0.86rem;\n  color:#555;line-height:1.9;\n}\n#bolus03 .bl-restart{\n  margin-top:18px;\n  background:#1565C0;color:#fff;\n  border:none;border-radius:7px;\n  padding:10px 28px;\n  font-size:0.9rem;font-weight:600;cursor:pointer;\n}\n#bolus03 .bl-restart:hover{background:#0d47a1;}\n<\/style>\n\n<div class=\"bl-header\">\n  <div class=\"bl-topic\">Respiratory Pharmacology \u00b7 Paediatrics<\/div>\n  <h2>Bolus<\/h2>\n  <div class=\"bl-tagline\">One patient. Ten visits. One story.<\/div>\n<\/div>\n\n<div class=\"bl-patient\" id=\"bolus03-patient\">\u21b3 Raju, 8. Wheezing since age 4. First proper visit.<\/div>\n<div class=\"bl-progress\" id=\"bolus03-progress\"><\/div>\n<div id=\"bolus03-cards\"><\/div>\n\n<div class=\"bl-result\" id=\"bolus03-result\">\n  <h3 id=\"bolus03-title\">Raju can breathe easy.<\/h3>\n  <div class=\"bl-end-tag\" id=\"bolus03-endtag\"><\/div>\n  <div class=\"bl-score-big\" id=\"bolus03-score-big\"><\/div>\n  <div class=\"bl-score-sub\" id=\"bolus03-score-sub\"><\/div>\n  <div class=\"bl-score-detail\" id=\"bolus03-score-detail\"><\/div>\n  <button class=\"bl-restart\" id=\"bolus03-restart\">\u21bb Visit Again<\/button>\n<\/div>\n\n<script>\n(function(){\n  var NS = 'bolus03';\n\n  var data = [\n    {\n      context: \"Raju, 8 years old, is brought by his mother with recurrent episodes of wheezing, chest tightness, and cough \u2014 worse at night and with exercise. Symptoms have occurred since age 4. Spirometry shows reversible airflow obstruction.\",\n      q: \"Raju is diagnosed with mild persistent asthma. Which drug is the first-line long-term controller medication?\",\n      opts: [\"Short-acting beta-2 agonist (salbutamol) as needed\",\"Low-dose inhaled corticosteroid (ICS) daily\",\"Oral theophylline daily\",\"Leukotriene receptor antagonist (montelukast) daily\"],\n      ans: \"Low-dose inhaled corticosteroid (ICS) daily\",\n      exp: \"Inhaled corticosteroids \u2014 budesonide, beclomethasone, fluticasone \u2014 are the cornerstone of long-term asthma control at all ages. They reduce airway inflammation, decrease exacerbation frequency, and improve lung function. Low-dose ICS daily is the step 2 treatment for mild persistent asthma in children. Salbutamol remains the rescue inhaler but is not a controller \u2014 relying on it alone signals inadequate control.\"\n    },\n    {\n      context: \"Raju is started on budesonide inhaler 100 mcg twice daily. His mother asks about side effects. She is particularly worried about growth suppression.\",\n      q: \"What is the recommended approach to minimise the risk of systemic side effects from inhaled corticosteroids in children?\",\n      opts: [\"Switch to oral prednisolone instead\",\"Use the lowest effective dose and rinse mouth after each use\",\"Avoid ICS entirely and use montelukast only\",\"Give ICS only during acute attacks\"],\n      ans: \"Use the lowest effective dose and rinse mouth after each use\",\n      exp: \"At recommended low-to-medium doses, ICS have minimal systemic absorption and are considered safe for long-term use in children. The lowest effective dose minimises any hypothalamic-pituitary-adrenal axis suppression. Mouth rinsing after each dose reduces local oropharyngeal candidiasis and decreases swallowed drug absorption. Growth velocity should be monitored periodically, but the risks of uncontrolled asthma far outweigh those of low-dose ICS.\"\n    },\n    {\n      context: \"Three months later Raju's symptoms are better controlled but not completely. He still wheezes with moderate exercise. His paediatrician considers stepping up therapy.\",\n      q: \"When stepping up from low-dose ICS in a child with uncontrolled asthma, what is the preferred addition?\",\n      opts: [\"Add oral theophylline\",\"Add a long-acting beta-2 agonist (LABA) such as salmeterol\",\"Double the ICS dose immediately\",\"Add oral montelukast\"],\n      ans: \"Add a long-acting beta-2 agonist (LABA) such as salmeterol\",\n      exp: \"Addition of a LABA (salmeterol or formoterol) to ICS is the preferred step-up in children aged 5 and above with inadequate control on low-dose ICS alone. LABAs act on \u03b22 receptors causing prolonged bronchodilation (12 hours) without replacing the anti-inflammatory action of ICS. Importantly, LABAs must never be used as monotherapy in asthma \u2014 always in combination with ICS \u2014 due to risk of masking worsening inflammation.\"\n    },\n    {\n      context: \"Raju has an acute asthma attack at school. He is brought to the emergency department with moderate wheeze, respiratory rate 34\/min, SpO2 93%. He is given nebulised salbutamol.\",\n      q: \"What is the mechanism of action of salbutamol in acute bronchospasm?\",\n      opts: [\"Inhibits mast cell degranulation\",\"Selective \u03b22-adrenoceptor agonist causing airway smooth muscle relaxation\",\"Blocks leukotriene receptors reducing mucosal oedema\",\"Inhibits phosphodiesterase increasing cAMP\"],\n      ans: \"Selective \u03b22-adrenoceptor agonist causing airway smooth muscle relaxation\",\n      exp: \"Salbutamol selectively activates \u03b22-adrenoceptors on airway smooth muscle, activating adenylate cyclase and increasing intracellular cAMP, which leads to smooth muscle relaxation and rapid bronchodilation within minutes. Its selectivity for \u03b22 over \u03b21 receptors minimises cardiac side effects at therapeutic doses. Nebulised delivery achieves direct airway deposition, making it the drug of choice for acute bronchospasm in all age groups.\"\n    },\n    {\n      context: \"Raju's acute attack is managed with nebulised salbutamol and supplemental oxygen. His SpO2 improves to 97%. His doctor adds a short course of oral prednisolone.\",\n      q: \"What is the primary rationale for giving systemic corticosteroids in an acute asthma attack?\",\n      opts: [\"Immediate bronchodilation within minutes\",\"Reduce airway inflammation and prevent late-phase reaction over hours\",\"Suppress the cough reflex\",\"Prevent secondary bacterial infection\"],\n      ans: \"Reduce airway inflammation and prevent late-phase reaction over hours\",\n      exp: \"Systemic corticosteroids in acute asthma act on airway inflammation \u2014 reducing oedema, mucus secretion, and inflammatory cell infiltration \u2014 but their onset of action is 4\u20136 hours, not immediate. Their principal value is preventing the late-phase asthmatic reaction and reducing the risk of relapse after the acute episode. A short course of 3\u20135 days is typical; tapering is not required for courses under 1 week.\"\n    },\n    {\n      context: \"Raju is discharged. His mother notices he sometimes forgets his preventer inhaler. His doctor considers adding montelukast for additional convenience.\",\n      q: \"What is the mechanism of action of montelukast?\",\n      opts: [\"Selective \u03b22-adrenoceptor agonist\",\"Cysteinyl leukotriene receptor antagonist (CysLT1 blocker)\",\"Mast cell stabiliser\",\"PDE-4 inhibitor\"],\n      ans: \"Cysteinyl leukotriene receptor antagonist (CysLT1 blocker)\",\n      exp: \"Montelukast blocks CysLT1 receptors, preventing leukotrienes (LTC4, LTD4, LTE4) from binding. Leukotrienes are potent inflammatory mediators released from mast cells and eosinophils that cause bronchoconstriction, airway oedema, and mucus secretion. Montelukast is particularly useful in exercise-induced asthma and in asthma with coexistent allergic rhinitis. It is oral, once daily, and well tolerated \u2014 improving adherence compared to inhalers.\"\n    },\n    {\n      context: \"Raju is now 12. His asthma has been well controlled for two years on ICS + LABA. He is a keen footballer and uses salbutamol before matches. He asks if this is safe.\",\n      q: \"Salbutamol is permitted in competitive sport but requires what documentation under WADA rules?\",\n      opts: [\"It is completely prohibited and cannot be used\",\"No documentation needed \u2014 it is freely permitted\",\"A Therapeutic Use Exemption (TUE) is required if dose exceeds 1600 mcg\/24 hours\",\"An outright ban applies only to oral salbutamol\"],\n      ans: \"A Therapeutic Use Exemption (TUE) is required if dose exceeds 1600 mcg\/24 hours\",\n      exp: \"Salbutamol is permitted under WADA regulations via inhaler up to a threshold of 1600 mcg over 24 hours without a TUE. Above this threshold \u2014 or if used in other formulations \u2014 a TUE is required. Salmeterol (LABA) is similarly permitted up to 200 mcg\/24 hours inhaled. This is a high-yield exam point and a practical one for athletes with asthma. Formoterol is permitted up to 54 mcg\/24 hours inhaled.\"\n    },\n    {\n      context: \"At 14, Raju develops worsening control despite good adherence. Allergy testing shows sensitisation to house dust mite. His specialist considers allergen immunotherapy.\",\n      q: \"Which form of allergen immunotherapy is approved for children with allergic asthma and rhinitis, and what is its route of administration?\",\n      opts: [\"Omalizumab \u2014 subcutaneous injection\",\"Subcutaneous allergen immunotherapy (SCIT) \u2014 injection series\",\"Sublingual immunotherapy (SLIT) \u2014 under-tongue drops or tablets\",\"Intranasal corticosteroids \u2014 nasal spray\"],\n      ans: \"Sublingual immunotherapy (SLIT) \u2014 under-tongue drops or tablets\",\n      exp: \"Sublingual immunotherapy (SLIT) with house dust mite extract is approved for children and adults with allergic rhinitis and mild-to-moderate allergic asthma. It is preferred over subcutaneous immunotherapy (SCIT) in children due to safety profile \u2014 SCIT carries a risk of systemic allergic reactions requiring clinic administration. SLIT is self-administered at home, improving convenience. Treatment duration is typically 3 years to achieve sustained benefit.\"\n    },\n    {\n      context: \"Raju is now 16 and developing severe persistent asthma with frequent exacerbations despite high-dose ICS\/LABA. IgE is markedly elevated. He is referred for biologic therapy.\",\n      q: \"Which biologic agent targets IgE and is approved for severe allergic asthma in adolescents?\",\n      opts: [\"Mepolizumab (anti-IL-5)\",\"Dupilumab (anti-IL-4\/IL-13)\",\"Omalizumab (anti-IgE)\",\"Benralizumab (anti-IL-5 receptor)\"],\n      ans: \"Omalizumab (anti-IgE)\",\n      exp: \"Omalizumab is a monoclonal antibody that binds free IgE, preventing it from attaching to mast cell and basophil receptors and thereby blocking the allergic cascade. It is approved for severe persistent allergic asthma in patients aged 6 and above with elevated IgE and confirmed allergen sensitisation. It reduces exacerbation rates, steroid burden, and improves quality of life. It is given as a subcutaneous injection every 2\u20134 weeks based on body weight and IgE level.\"\n    },\n    {\n      context: \"Raju is now 18 and transitioning to adult care. He has been on Omalizumab for 2 years with excellent control. 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Ten visits. One story. \u21b3 Raju, 8. Wheezing since age 4. First proper visit. Raju can breathe easy. \u21bb Visit Again<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","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":[78,18,20],"tags":[],"class_list":["post-37010","post","type-post","status-publish","format-standard","hentry","category-bolus","category-cms","category-pediatrics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Respiratory Pharmacology - atsixty<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atsixty.com\/index.php\/cms\/respiratory-pharmacology\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Respiratory Pharmacology - atsixty\" \/>\n<meta property=\"og:description\" content=\"Respiratory Pharmacology \u00b7 Paediatrics Bolus One patient. Ten visits. One story. \u21b3 Raju, 8. Wheezing since age 4. First proper visit. 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