The New Blood Pressure Target in Primary Care

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I'm Dr Neil Skolnik. Today we are going to talk about the new Blood Pressure Targets in Adults With Hypertension: A Clinical Practice Guideline From the AAFP (American Academy of Family Physicians). There are very few things that we treat more often than hypertension, so you'd think the guidelines would have been clear a long time ago. Less than 10 years ago, in 2014, JNC 8 recommended target blood pressure (BP) for individuals under 60 to be < 140/90, and for those older than 60, < 150/90.

Then, based primarily on the SPRINT trial (which included only people with or at significantly elevated risk for atherosclerotic cardiovascular disease), in 2017 the American Heart Association's hypertension guidelines lowered the target BP to < 130/80 for most individuals. It's a little more nuanced than that, but most of us don't remember the nuance. I've written about my reservations with that statement in the AHA's journal, Circulation.

Now the AAFP has updated its recommendations and they recommend a BP < 140/90. This is not a small change, as it often takes additional medication to achieve lower BP targets, and additional medicines lead to additional adverse effects. I'm going share with you some details from the new guideline, and then I'm going share my opinion about it.

The AAFP guideline applies to adults with hypertension, with or without cardiovascular disease. In the comprehensive literature review, the trials ran for an average of 3.7 years, and about 75% of the patients in the trials did not have preexisting cardiovascular disease.

The key to their recommendations is that target BPs lower than 140/90 did not show a statistically significant decrease in total mortality. In regard to serious adverse events, though, lower targets led to a nominal increase that didn't reach statistical significance. Serious adverse events were defined as death or events that required hospitalization or resulted in significant disability. In regard to all other adverse events, including syncope and hypotension, there was a significant increase, with a relative risk of 1.44 (a 44% increase in adverse events). This reflected an absolute risk increase of 3% compared with the standard target group (specifically 9.8% vs 6.8%), with a number needed to harm of 33 over 3.7 years.

Another potential harm of low BP targets was the need for an average of one additional medicine to reach lower BP targets. One systematic review cited an eightfold higher withdrawal rate due to adverse events in the lower target BP groups.

The AAFP guidelines said that in the comprehensive review of the literature, while there was no difference in mortality or stroke with lower BP targets, a small additional benefit was observed in myocardial infarction — a 16% lower incidence, with a number needed to treat of 137 over 3.7 years.