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Aggressive blood pressure control: Too much of a good thing?

Peter Ubel, MD
Conditions
May 10, 2016
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Aggressive control of blood pressure has saved millions of lives and has prevented millions of people from experiencing heart attacks, strokes, and kidney failure, among other things. Admittedly, controlling blood pressure is not the sexy part of medical care, but when primary care doctors like me help people get their blood pressure under control, we do just as much good as any of our colleagues who practice as cardiovascular surgeons. (No offense to those surgeons, of course, who do worlds of good for their patients!)

But blood pressure reduction can be too much of a good thing. For example, when patients with diabetes receive overly aggressive blood pressure treatment, the harms of that treatment — the side effects of low blood pressure — loom larger than the potential benefits.

And I’m not talking just side effects like feeling a little bit fatigued from taking the pill. Aggressive blood pressure treatment can increase the risk of hazardous falls, for example. Consequently, physicians sometimes need to take their foot off the gas and reduce the intensity of patients’ blood pressure medications.

Unfortunately, a study from JAMA Internal Medicine shows that doctors frequently have difficulty backing off. The study looked at diabetes patients and assessed whether doctors reduced the intensity of hypertension treatments when people’s blood pressure dropped below recognized thresholds. They also looked at whether doctors reduced the intensity of patients’ diabetes medications when their blood sugar levels — their A1C results — got worrisomely low. In looking at how aggressively doctors treated patients, the researchers also estimated how long patients had to live, based on their age and how sick they were. They estimated this because someone in the last, say, five years of his life is not going to get much benefit from aggressive blood pressure or diabetes control, because of the benefits of such control (versus more moderate control) accrue over many years, while the harms, the side effects, happen much more quickly.

The researchers discovered that physicians had a hard time backing off on, “de-intensifying,” aggressive treatment. For instance, when people’s blood pressure levels got less than 120/65, less than 1/4 of doctors reduced the dosage of patients’ blood pressure pills, even when patients were so old or sick that they probably had fewer than five years to live:

Physicians-Can’t-Stop-Overtreating-Diabetes-and-Hypertension-1

Physicians were a little better at backing off on aggressive diabetes treatment, but still backed off only 1/3 of the time for patients with very low blood sugars (A1C less than 6), even among patients expected to live less than five years:

Physicians-Can’t-Stop-Overtreating-Diabetes-and-Hypertension-2

We all need to remember that too much medical care is a bad thing. When health care interventions work, they sometimes work too well. We have to know when to start people on medications, and when to take them off.

Peter Ubel is a physician and behavioral scientist who blogs at his self-titled site, Peter Ubel and can be reached on Twitter @PeterUbel. He is the author of Critical Decisions: How You and Your Doctor Can Make the Right Medical Choices Together. This article originally appeared in Forbes.

Image credit: Shutterstock.com

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Aggressive blood pressure control: Too much of a good thing?
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