Preoperative Antihypertensive Management
In patients with hypertension undergoing major surgery, continue most antihypertensive medications until surgery, but consider discontinuing ACE inhibitors and ARBs perioperatively, never abruptly stop beta blockers or clonidine, and do not start beta blockers on the day of surgery. 1, 2, 3
Critical Medication-Specific Recommendations
MUST CONTINUE (Class I)
- Beta blockers: If patient is chronically on beta blockers, continuation is mandatory 1, 2, 4. Abrupt discontinuation causes potentially harmful rebound hypertension and is classified as Class III: Harm 1, 2, 5
- Clonidine: Abrupt preoperative discontinuation is potentially harmful (Class III: Harm) due to severe rebound hypertension 1, 2, 6
REASONABLE TO CONTINUE (Class IIa)
- Most other antihypertensives: Calcium channel blockers, other agents - continue until surgery 1, 2, 3
MAY CONSIDER DISCONTINUING (Class IIb)
- ACE inhibitors and ARBs: Perioperative discontinuation may be considered due to increased risk of intraoperative hypotension and acute kidney injury with hemodynamic challenges 1, 7. This remains controversial with limited level 1 evidence, but the mechanism of action during anesthesia-induced vasodilation supports this approach 7
NEVER START (Class III: Harm)
- Beta blockers on day of surgery: Do not initiate beta blockers on the day of surgery in beta blocker-naïve patients - this significantly increases perioperative risk based on POISE trial data 1, 2, 4
Blood Pressure Thresholds for Surgery
For severely elevated BP (SBP ≥180 mmHg or DBP ≥110 mmHg), deferring elective major surgery may be considered (Class IIb) 1, 2, 3. However, for minor to moderate BP elevations, postponing surgery is not warranted as these patients are not at substantially higher cardiovascular risk 8.
The 2024 ESC guidelines emphasize that avoiding large BP fluctuations perioperatively is more important than absolute BP values, and planning should account for baseline office BP 8.
Intraoperative Management
Patients with intraoperative hypertension should be managed with IV medications (Class I) 1, 2, 5. Preferred agents include:
- Clevidipine - most effective per meta-analysis for perioperative hypertension without adverse events 2, 4
- Esmolol - particularly for tachycardia with hypertension
- Nicardipine - reliable calcium channel blocker
- Nitroglycerin - especially with coronary disease
These agents allow rapid titration during anesthesia induction and airway manipulation, when intraoperative hypertension most frequently occurs 1, 5, 6.
Postoperative Resumption
Restart preoperative antihypertensive medications as soon as clinically reasonable to avoid complications from postoperative hypertension 3. Exercise caution in older adults (≥65 years) and patients with low-normal perioperative BPs where hypotension risk is elevated 3.
Common Pitfalls to Avoid
- Never abruptly stop beta blockers or clonidine - this is the most dangerous error, causing severe rebound hypertension 1, 2
- Do not initiate beta blockers perioperatively in beta blocker-naïve patients
- Do not routinely defer surgery for mild-moderate hypertension - target organ damage matters more than BP numbers 8, 9
- Assess contributing factors before treating perioperative hypertension pharmacologically: volume status, pain control, oxygenation, bladder distention 2, 4
The evidence consistently supports medication continuation over discontinuation, with specific exceptions for ACE inhibitors/ARBs where the decision requires clinical judgment based on surgery type and patient hemodynamic stability.