Enumerate anti hypertensives from kd tripathi for AIIMS md anaesthesia exams
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KD Tripathi antihypertensive drugs classification AIIMS anesthesia pharmacology
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KD Tripathi antihypertensive drugs classification chapter 40 diuretics beta blockers ACE inhibitors ARBs CCBs vasodilators
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I now have the complete KD Tripathi classification directly from the source. Here is the full, structured answer:
Antihypertensive Drugs - KD Tripathi Classification (Chapter 40)
KD Tripathi, Essentials of Medical Pharmacology, 8th Edition
Complete Classification
1. Diuretics
| Subclass | Drugs |
|---|---|
| Thiazides | Hydrochlorothiazide, Chlorthalidone, Indapamide |
| High ceiling (Loop) | Furosemide, Bumetanide, Torasemide |
| K+ Sparing | Spironolactone, Amiloride |
2. ACE Inhibitors
Captopril, Enalapril, Lisinopril, Perindopril, Ramipril, Fosinopril
3. Angiotensin (AT1) Receptor Blockers (ARBs)
Losartan, Candesartan, Irbesartan, Valsartan, Telmisartan
4. Direct Renin Inhibitor
Aliskiren
5. Calcium Channel Blockers (CCBs)
| Subgroup | Drugs |
|---|---|
| Dihydropyridines (DHPs) | Nifedipine, Felodipine, Amlodipine, Nitrendipine, Lacidipine |
| Phenylalkylamine | Verapamil |
| Benzothiazepine | Diltiazem |
6. Beta (β) Adrenergic Blockers
Propranolol, Metoprolol, Atenolol, Bisoprolol, Nebivolol
7. β + α Adrenergic Blockers
Labetalol, Carvedilol
8. Alpha (α) Adrenergic Blockers
- Selective α1: Prazosin, Terazosin, Doxazosin
- Non-selective: Phentolamine, Phenoxybenzamine
9. Central Sympatholytics
Clonidine, Methyldopa
10. Vasodilators
| Type | Drugs |
|---|---|
| Arteriolar only | Hydralazine, Minoxidil, Diazoxide |
| Arteriolar + Venous | Sodium nitroprusside |
Obsolete/Historical only: Adrenergic neurone blockers (Reserpine, Guanethidine) and Ganglion blockers (Pentolinium) - KD Tripathi considers these of "historical importance only," though Reserpine is still marketed.
First-Line Drugs (KD Tripathi / JNC 7)
KD Tripathi identifies 4 first-choice groups based on large randomized trial evidence:
- Diuretics (thiazides)
- ACE inhibitors / ARBs
- Calcium channel blockers
- Beta blockers
AIIMS Anesthesia High-Yield Points
Drugs relevant to perioperative period:
| Drug | Periop Relevance |
|---|---|
| Clonidine (α2 agonist) | Used as premedication; reduces MAC, opioid requirements, prevents rebound HTN |
| Labetalol | Drug of choice for hypertensive emergencies in pregnancy; safe perioperatively |
| Sodium nitroprusside | Used for controlled hypotension intraop; risk of cyanide toxicity with prolonged use |
| Hydralazine | IV used in hypertensive emergencies in obstetrics |
| Nitroglycerin | Arteriolar + venous dilator; used for controlled hypotension |
| Esmolol | Ultra-short acting β1 blocker; attenuates laryngoscopy response |
| Nicardipine / Clevidipine | Parenteral DHPs used for intraop hypertension |
| Enalaprilat | Parenteral ACE inhibitor for hypertensive emergencies |
| Fenoldopam | Dopamine D1 agonist; used in hypertensive emergency, renoprotective |
| ACE inhibitors | Should ideally be withheld on day of surgery (risk of refractory intraop hypotension) |
| Beta blockers | Continue perioperatively (abrupt withdrawal causes rebound HTN/tachycardia) |
Drugs used for controlled hypotension (AIIMS favourite):
- Sodium nitroprusside (most potent, direct arteriolar+venous)
- Nitroglycerin
- Labetalol
- Esmolol
- Clevidipine / Nicardipine
- Remifentanil (adjunct)
Mechanism-Based Summary for Quick Revision
REDUCE CARDIAC OUTPUT REDUCE PERIPHERAL RESISTANCE
- Beta blockers - Vasodilators (hydralazine, SNP)
- Central sympatholytics - CCBs
- Diuretics (↓ volume) - Alpha blockers
- ACE inhibitors / ARBs
- β+α blockers (labetalol)
Source: KD Tripathi, Essentials of Medical Pharmacology, Chapter 40 - Antihypertensive Drugs. Supplemented from Katzung's Basic and Clinical Pharmacology, 16th Edition (available in textbook library).
Create a comparison table of perioperative management for different antihypertensive classes
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perioperative management antihypertensive drugs continue withhold anesthesia guidelines 2024
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I have comprehensive data from Miller's Anesthesia, Fischer's Mastery of Surgery, Medscape, and the 2024 AHA/ACC guideline. Now I can compile the full comparison table.
Perioperative Management of Antihypertensive Drug Classes
Sources: Miller's Anesthesia 10e, Fischer's Mastery of Surgery 8e, 2024 AHA/ACC Perioperative Guidelines, 2022 ESC Guidelines
Master Comparison Table
| Drug Class | Examples | Day Before Surgery | Day of Surgery (Morning) | Intraoperative | Postoperative Restart | Key Periop Concern |
|---|---|---|---|---|---|---|
| Beta Blockers | Metoprolol, Atenolol, Propranolol, Esmolol | Continue usual dose | Continue (with sip of water) | IV bolus/infusion if needed (Esmolol, Metoprolol IV) | Restart as soon as oral intake resumes | Abrupt withdrawal = rebound tachycardia, HTN, risk of MI. De novo initiation NOT recommended (POISE-1: ↑ stroke, hypotension, death) |
| Non-DHP CCBs | Verapamil, Diltiazem | Continue usual dose | Continue (with sip of water) | IV bolus if needed (Verapamil, Diltiazem IV) | Continue IV until oral resumes | Risk of bradycardia + hypotension, especially when combined with beta blockers. 2024 AHA: continue for arrhythmia/angina indications |
| DHP CCBs | Amlodipine, Nifedipine, Felodipine | Continue usual dose | Generally continue - consider withholding if baseline BP low | IV Nicardipine or Clevidipine if needed | Resume when BP has stabilized | Reflex tachycardia with short-acting DHPs; less concern with amlodipine. Parenteral nicardipine/clevidipine useful intraop |
| ACE Inhibitors | Enalapril, Ramipril, Lisinopril | Stop day before (traditional); newer evidence supports continuing | Hold morning dose | Enalaprilat IV for hypertensive emergency | Restart as soon as stable, esp. in HFrEF/CKD | High risk of refractory intraop hypotension unresponsive to vasopressors. 2024 AHA: tailored approach - hold in high-risk/hemodynamically unstable surgery |
| ARBs | Losartan, Telmisartan, Valsartan | Stop day before (traditional); newer evidence supports continuing | Hold morning dose | No IV equivalent available | Restart ASAP; critical in HFrEF/CKD | Same mechanism as ACEi - vasoplegia risk. STOP-or-NOT trial (JAMA 2024): withholding reduces intraop hypotension but no difference in mortality/MACE |
| Thiazide Diuretics | Hydrochlorothiazide, Chlorthalidone, Indapamide | Stop day before | Hold on day of surgery | - | Restart when BP stable and renal function at baseline | Volume depletion + hypokalemia + anesthetic agents = dangerous combination. Electrolyte check preop mandatory |
| Loop Diuretics | Furosemide, Torsemide | Stop day before | Hold on day of surgery | IV Furosemide if pulmonary edema develops | Restart when volume status and renal function stable | Greater volume/electrolyte risk than thiazides. Hypokalemia potentiates neuromuscular blockers |
| K+-Sparing Diuretics | Spironolactone, Amiloride, Eplerenone | Stop | Hold | - | Restart with other antihypertensives | Risk of hyperkalemia perioperatively, especially with ACEi/ARBs or renal impairment |
| Central Sympatholytics (α2 agonists) | Clonidine, Methyldopa | Continue | Continue (with sip of water) - DO NOT stop abruptly | Clonidine patch/IV Methyldopa/Nitroprusside if oral route unavailable | Restart promptly; consider transdermal clonidine patch | Abrupt withdrawal = severe rebound HTN (sympathetic surge). Transdermal patch takes 48h to reach therapeutic levels - apply early if switching. Useful as premedication (anxiolysis, ↓ MAC) |
| Alpha-1 Blockers | Prazosin, Doxazosin, Terazosin | Continue | Continue with caution | Phenylephrine/Noradrenaline for hypotension | Resume when BP stable | First-dose hypotension effect; orthostatic hypotension exacerbated by general anesthesia. Phenoxybenzamine in pheochromocytoma preop |
| β+α Blockers | Labetalol, Carvedilol | Continue | Continue | IV Labetalol for hypertensive emergencies | Continue | Drug of choice for periop HTN in pregnancy. Masks tachycardia. Labetalol IV onset 5 min, useful for controlled hypotension |
| Direct Renin Inhibitor | Aliskiren | Stop day before | Hold | No IV form | Restart when stable | Limited periop data; treat similarly to ACEi/ARBs (RAS blockade = vasoplegia risk) |
| Vasodilators | Hydralazine, Minoxidil, Diazoxide, SNP | Continue | Continue | IV SNP/Nitroglycerin/Hydralazine for intraop HTN and controlled hypotension | Resume oral when stable | SNP: risk of cyanide toxicity with prolonged infusion (>3 mcg/kg/min). Hydralazine: reflex tachycardia. Minoxidil: fluid retention |
Summary Decision Card
ALWAYS CONTINUE PERIOPERATIVELY HOLD ON DAY OF SURGERY
- Beta blockers (↑ risk if stopped) - ACE inhibitors / ARBs *
- Non-DHP CCBs - Diuretics (all classes)
- Central sympatholytics (clonidine) - Direct renin inhibitors
- Labetalol / Carvedilol
- DHP CCBs (generally continue)
*2024 AHA/ACC: ACE inhibitors/ARBs - individualized; hold
if high-risk surgery, prone to hemodynamic instability.
STOP-or-NOT trial (JAMA 2024): continuing ≠ increased mortality,
but withholding ↓ intraop hypotension and AKI risk.
Intraoperative HTN - IV Drug Options
| Drug | Class | Onset | Duration | Dose | Notes |
|---|---|---|---|---|---|
| Labetalol | α+β blocker | 5 min | 3-6 h | 5-20 mg IV bolus | DOC in pregnancy |
| Esmolol | Selective β1 blocker | 1-2 min | 10-20 min | 0.5 mg/kg load, then 50-300 mcg/kg/min | Attenuates laryngoscopy response |
| Metoprolol | Selective β1 blocker | 5 min | 3-4 h | 2.5-5 mg IV bolus | |
| Nicardipine | DHP CCB | 5-15 min | 30-40 min | 5-15 mg/h infusion | Reliable, titratable |
| Clevidipine | Ultra-short DHP CCB | 2-4 min | 5-15 min | 1-16 mg/h infusion | Ester-hydrolyzed, safe in hepatic/renal failure |
| Hydralazine | Direct vasodilator | 10-20 min | 2-4 h | 5-10 mg IV bolus | Reflex tachycardia; good in eclampsia |
| Sodium Nitroprusside | Arteriolar+venous | Seconds | 1-2 min | 0.1-10 mcg/kg/min | Controlled hypotension; cyanide toxicity risk |
| Nitroglycerin | Venous > arteriolar | 1-5 min | 3-5 min | 5-200 mcg/min | Preferred with myocardial ischemia |
| Phentolamine | α blocker | 1-2 min | 10-15 min | 1-5 mg IV bolus | Drug of choice for pheochromocytoma crisis |
| Fenoldopam | Dopamine D1 agonist | 5-10 min | 30 min | 0.1-1.6 mcg/kg/min | Renoprotective; useful in renal at-risk patients |
| Enalaprilat | Parenteral ACEi | 15-30 min | 6-8 h | 0.625-1.25 mg IV | Unpredictable response |
AIIMS-Focused High Yield Points
| Scenario | Drug of Choice |
|---|---|
| Hypertensive emergency in pregnancy | Labetalol IV, Hydralazine IV |
| Intraop HTN with myocardial ischemia | Nitroglycerin |
| Controlled hypotension (neurosurgery/spine) | Sodium nitroprusside, Esmolol, Labetalol |
| Laryngoscopy response attenuation | Esmolol, Lidocaine, Opioids |
| Pheochromocytoma intraop crisis | Phentolamine |
| Renal-protective intraop antihypertensive | Fenoldopam |
| Premedication with antihypertensive benefit | Clonidine (α2 agonist) |
| Rebound HTN after clonidine withdrawal | IV Methyldopa, SNP, Phentolamine |
| ACEi/ARB-induced intraop vasoplegia | Vasopressin, Norepinephrine, Phenylephrine |
Sources: Miller's Anesthesia 10e (block11, p.3895), Fischer's Mastery of Surgery 8e (Table 2.11), 2024 AHA/ACC Perioperative Guideline, Medscape Perioperative Medication Management.
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