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Antihypertensives and Antianginals in Anesthesia: EM Pearls [ Medical Education ](https://mdster.com/blog?category=medical-education) Antihypertensives and Antianginals in Anesthesia: EM Pearls ============================================================= Perioperative beta blockers, calcium channel blockers, and nitrates through the lens of ischemia, hypotension, and coronary perfusion [ MDster Editorial Team ](https://mdster.com/about) · Mar 14, 2026 · 7 min read · 89 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Board Review ](https://mdster.com/blog?tag=board-review) [ Emergency Medicine ](https://mdster.com/blog?tag=emergency-medicine) [ Anesthesia Pharmacology ](https://mdster.com/blog?tag=anesthesia-pharmacology) [ Cardiovascular Drugs ](https://mdster.com/blog?tag=cardiovascular-drugs) [ Perioperative Care ](https://mdster.com/blog?tag=perioperative-care) Share this article Share this post The patient who infarcts around induction usually does not look dramatic at first. He gets tachycardic with laryngoscopy, a little hypotensive after propofol, a little ST depression after incision, and only later does the troponin tell the story. Antihypertensives and antianginals matter in anesthesia because they are really **myocardial oxygen supply-demand drugs**. In the ED, OR, and peri-intubation window, your job is not to chase a number on the monitor. Your job is to blunt sympathetic stress without stealing coronary perfusion. [\[1\]](#cite-1 "Reference [1]") Start with the physiology that boards actually test --------------------------------------------------- Perioperative ischemia is usually a mismatch problem. **Demand** rises with tachycardia, contractility, and wall stress. **Supply** falls when diastolic perfusion time shortens, aortic diastolic pressure drops, coronary stenoses limit flow, or LVEDP rises and compresses the subendocardium. Beta blockers mainly lower demand, nitrates lower wall stress and filling pressure, and calcium channel blockers do one of two very different jobs depending on the subclass: vasodilation or rate-slowing. If you keep that framework in your head, the drug choice becomes much more obvious. [\[1\]](#cite-1 "Reference [1]") ClassDominant effectWhy anesthesia cares**Beta blockers**Lower HR and contractilityUseful for sympathetic surges, but chronic therapy should be continued and de novo day-of-surgery initiation is a mistake. [\[1\]](#cite-1 "Reference [1]")**Non-DHP CCBs**Slow SA/AV node and depress contractilityGood for rate control or vasospasm in the right patient, but bradycardia and LV dysfunction matter. [\[2\]](#cite-2 "Reference [2]")**DHP CCBs**Arterial vasodilationBetter pressure drugs than rate drugs; watch hypotension and reflex physiology. [\[2\]](#cite-2 "Reference [2]")**Nitrates**Venodilation first, then afterload reduction at higher dosesCan relieve ischemia if pressure reserve exists; can worsen it if diastolic pressure collapses. [\[3\]](#cite-3 "Reference [3]") Beta blockers: continue them, but do not improvise with them ------------------------------------------------------------ The highest-yield perioperative beta-blocker point is simple: **continue chronic therapy unless shock, severe bradycardia, or another clear contraindication intervenes**. Withdrawal is associated with worse outcomes, and postoperative tachycardia should trigger a search for pain, hypovolemia, blood loss, or sepsis before you reflexively increase the dose. This is where short-acting agents such as esmolol make practical sense: they let you test whether the physiology really wants rate control instead of committing the patient to a long tail of bradycardia or hypotension. [\[1\]](#cite-1 "Reference [1]") What you should not do is start a high-dose beta blocker hours before surgery in a beta-blocker-naive patient and congratulate yourself for being “cardioprotective.” In **POISE**, metoprolol started 2 to 4 hours pre-op reduced MI but increased stroke and death. That is the exam trap and the clinical trap: a drug that lowers demand can still hurt the patient if it buys that effect with hypotension and bradycardia. Current perioperative guidance therefore favors continuation of established therapy and avoidance of last-minute initiation. [\[4\]](#cite-4 "Reference [4]") > **Clinical Pearl:** A tachycardic patient after induction needs a diagnosis before a beta blocker. Pain, hypovolemia, bleeding, hypoxia, and light anesthesia are often the real pathology. [\[1\]](#cite-1 "Reference [1]") Calcium channel blockers: the subclass matters more than the label ------------------------------------------------------------------ Do not lump all CCBs together. **Verapamil and diltiazem** are non-dihydropyridines; they slow SA/AV nodal conduction and add negative inotropy. **Amlodipine, nifedipine, nicardipine, and clevidipine** are dihydropyridines; they are mostly vasodilators. In anesthesia terms, non-DHP drugs can synergize with beta blockers, propofol, opioids, and volatile agents to produce bradycardia, AV block, or an unhappy ventricle. DHP drugs are better thought of as afterload reducers. Boards love this distinction because it explains why verapamil and diltiazem behave like rate drugs while nicardipine behaves like a pressure drug. [\[2\]](#cite-2 "Reference [2]") Perioperatively, chronic CCB therapy is usually maintained, especially in patients with **vasospastic angina**, although some guidance suggests individualizing the day-of-surgery dose when hypotension risk is high. The board-relevant pearl is sharper: in vasospastic angina, **CCBs suppress episodes; beta blockers are not the preferred first-line move**. If the stem says chest pain at rest, transient ST changes, and suspected coronary spasm, think CCB first and nitrates as adjuncts, not reflex beta blockade. [\[1\]](#cite-1 "Reference [1]") Nitrates and coronary perfusion: helpful until you drop the diastolic pressure ------------------------------------------------------------------------------ Nitroglycerin relieves angina mainly by changing ventricular loading conditions, not by magically reversing plaque rupture. By lowering preload and LVEDP, it reduces wall stress and can improve subendocardial perfusion; in invasive human exercise studies, nitroglycerin maintained coronary pressure and increased coronary flow despite lower systemic pressure. For chronic coronary disease, sublingual nitroglycerin remains the immediate rescue drug, while long-acting nitrates are reasonable antianginal therapy or add-on therapy when symptoms persist. [\[3\]](#cite-3 "Reference [3]") But nitro is only a good anti-ischemic drug if you still have **pressure reserve**. Most left ventricular coronary flow occurs during diastole, so if nitrate-induced vasodilation drops aortic diastolic pressure more than it lowers LVEDP, you may worsen perfusion even while the blood pressure looks “treated.” That is why the preload-dependent, marginal-pressure patient is not a reflex nitrate patient. Traditional ACS guidance warns against nitrates in RV infarction for exactly this reason; newer meta-analysis suggests the evidence base is weaker than the dogma, but the physiology still argues for caution when the patient already looks hypotensive or RV-dependent. [\[5\]](#cite-5 "Reference [5]") Clinical Correlations --------------------- In Emergency Medicine, this pharmacology shows up fast. The hypertensive chest-pain patient before RSI may benefit from titratable beta blockade if the problem is catecholamine surge and perfusion is preserved. The patient with suspected vasospasm or severe afterload excess may respond better to a CCB or nitrate. The patient with occult shock, blood loss, or RV dependence can decompensate with any of the above. The mistake is always the same: choosing the drug that lowers the number instead of the drug that fixes the physiology. That is exactly how peri-intubation ischemia, post-induction collapse, and board questions are built. [\[1\]](#cite-1 "Reference [1]") Key Takeaways ------------- - **Continue chronic beta blockers** perioperatively when possible; abrupt withdrawal is harmful. [\[1\]](#cite-1 "Reference [1]") - **Do not start high-dose beta blockers right before surgery**; POISE showed less MI but more stroke and death. [\[4\]](#cite-4 "Reference [4]") - **Know your CCB subclass**: non-DHP agents slow conduction and depress contractility, while DHP agents primarily vasodilate. [\[2\]](#cite-2 "Reference [2]") - **Vasospastic angina is a CCB-and-nitrate problem**, not a reflex beta-blocker problem. [\[6\]](#cite-6 "Reference [6]") - **Nitroglycerin can improve ischemia by lowering wall stress and LVEDP**, but excessive hypotension can reduce coronary perfusion. [\[3\]](#cite-3 "Reference [3]") - In the perioperative patient, **treat the physiology first**: tachycardia from pain or hemorrhage is not a beta-blocker deficiency. [\[1\]](#cite-1 "Reference [1]") Conclusion ---------- If you remember one mental model, make it this: these drugs are not just antihypertensives or antianginals. They are tools for manipulating **heart rate, loading conditions, and coronary perfusion pressure**. Use them when the physiology matches, and do not let a prettier blood pressure cost the myocardium its diastolic flow. [\[1\]](#cite-1 "Reference [1]") References (12) ------------------- 1. 1. [ academic.oup.com/eurheartj/article/43/39/3826/6675076 ](https://academic.oup.com/eurheartj/article/43/39/3826/6675076) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ pmc.ncbi.nlm.nih.gov/articles/PMC7121118 ](https://pmc.ncbi.nlm.nih.gov/articles/PMC7121118/) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ pmc.ncbi.nlm.nih.gov/articles/PMC5491223 ](https://pmc.ncbi.nlm.nih.gov/articles/PMC5491223/) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ pubmed.ncbi.nlm.nih.gov/18479744 ](https://pubmed.ncbi.nlm.nih.gov/18479744/) [↩](#cite-ref-4-1 "Back to text") 5. 5. [ pmc.ncbi.nlm.nih.gov/articles/PMC5966026 ](https://pmc.ncbi.nlm.nih.gov/articles/PMC5966026/) [↩](#cite-ref-5-1 "Back to text") 6. 6. [ www.heart.org/-/media/PHD-Files-2/Science-News/2/2023/2023\_chronic\_coronary\_disease\_guideline\_slide\_set.pdf ](https://www.heart.org/-/media/PHD-Files-2/Science-News/2/2023/2023_chronic_coronary_disease_guideline_slide_set.pdf) [↩](#cite-ref-6-1 "Back to text") 7. 7. Thompson A, Fleischmann KE, Smilowitz NR, et al. 2024 AHA/ACC/ACS/ASNC/HRS/SCA/SCCT/SCMR/SVM Guideline for Perioperative Cardiovascular Management for Noncardiac Surgery. Journal of the American College of Cardiology. 2024. 8. 8. Halvorsen S, Mehilli J, Cassese S, et al. 2022 ESC Guidelines on cardiovascular assessment and management of patients undergoing non-cardiac surgery. European Heart Journal. 2022;43(39):3826-3924. 9. 9. Virani SS, Newby LK, Arnold SV, et al. 2023 AHA/ACC/ACCP/ASPC/NLA/PCNA Guideline for the Management of Patients With Chronic Coronary Disease. Circulation. 2023;148:e9-e119. 10. 10. Devereaux PJ, Yang H, Yusuf S, et al. Effects of extended-release metoprolol succinate in patients undergoing non-cardiac surgery (POISE trial): a randomised controlled trial. Lancet. 2008;371(9627):1839-1847. 11. 11. Patterson KN, Williams RP, Lockie T, et al. Physiology of Angina and Its Alleviation With Nitroglycerin: Insights From Invasive Catheter Laboratory Measurements During Exercise. Circulation. 2017;136(1):24-34. 12. 12. Wilkinson-Stokes M, Betson J, Sawyer S. Adverse events from nitrate administration during right ventricular myocardial infarction: a systematic review and meta-analysis. Emergency Medicine Journal. 2023;40(2):108-113. 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