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Low vs. High blood pressure avoidance in non-cardiac surgery: Neurocognitive outcomes unchanged, finds study

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2025-06-04T21:15:57+05:30  |  Updated On 5 Jun 2025 1:38 PM IST
Low vs. High blood pressure avoidance in non-cardiac surgery: Neurocognitive outcomes unchanged,  finds study
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A large international study has found that two different approaches to managing blood pressure in older adults undergoing non-cardiac surgery, one avoiding low blood pressure (hypotension) and the other high blood pressure (hypertension), lead to similar outcomes in terms of in-hospital delirium and cognitive changes one year after surgery.

The findings were published on June 3 in Annals of Internal Medicine.

The randomized controlled trial, a substudy of the POISE-3 trial, included 2,603 patients across 54 centres in 19 countries undergoing non-cardiac surgery. Participants were 70 years old on average, taking at least one blood pressure medication, and considered at high risk for vascular complications.

The study compared two strategies that used different targets for mean arterial pressure (MAP), the blood pressure level anesthesiologists aim to maintain during surgery.

  • A hypotension-avoidance strategy, that aimed at maintaining a higher intraoperative blood pressure target (MAP ≥80 mm Hg), and, on the day of surgery and during the first two postoperative days, paused patient’s chronic renin–angiotensin system inhibitors (among the most used blood pressure medications, for which there was non-definitive evidence of possible harm when continued perioperatively), and continued other antihypertensive medications based on the patient’s blood pressure.
  • A hypertension-avoidance strategy, which aimed at a lower target (MAP ≥60 mm Hg) during surgery and continued all chronic blood pressure medications.

“This is the largest existing trial evaluating interventions targeting neurocognitive outcomes after non-cardiac surgery,” said Maura Marcucci, scientist and principal investigator with PHRI, a joint institute of McMaster University and Hamilton Health Sciences.

The study found no significant differences between the groups in delirium during the first three days after surgery or in cognitive decline one year later. The most likely explanation is that the two strategies eventually produced differences in blood pressure that were too little and limited in time to result into differences in clinical outcomes including neurocognitive outcomes.

“The findings suggest that either strategy can be used without increasing the risk of neurocognitive complications after non-cardiac surgery,” added Marcucci. “This gives the physicians more flexibility to tailor care to each patient’s needs.”

The findings not only provide clarity for doctors but also reassure patients, many of whom worry about how their chronic medications are managed when they undergo surgery, especially when overseen by physicians who are not their regular cardiologists or family doctors.

“We all know someone on blood pressure medications and who has had surgery. For patients and their families, this study shows that choosing one approach over the other doesn’t increase the risk of confusion or memory loss after surgery, which are the most feared outcomes of surgery or anesthesia.”

Reference:

Maura Marcucci, Matthew T.V. Chan, Thomas W. Painter, et al. Effects of a Hypotension-Avoidance Versus a Hypertension-Avoidance Strategy on Neurocognitive Outcomes After Noncardiac Surgery. Ann Intern Med. [Epub 3 June 2025]. doi:10.7326/ANNALS-24-02841

Annals of Internal Medicineblood pressurenon-cardiac surgeryhypertension
Source : Annals of Internal Medicine
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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