Nation

Blood pressure guidelines raised

For years, people have been told to strive for a blood pressure below 140/90. But new guidelines say the top number, the systolic pressure, should be below 150.

Bruce Smith/Associated Press/File 2013

For years, people have been told to strive for a blood pressure below 140/90. But new guidelines say the top number, the systolic pressure, should be below 150.

New guidelines suggest that people older than 60 can have a higher blood pressure than previously recommended before starting treatment to lower it. The advice, criticized by some physicians, changes treatment goals that have been in place for more than 30 years.

Until now, people were told to strive for blood pressures below 140/90, with some taking multiple drugs to achieve that. But the committee, which spent five years reviewing evidence, concluded that the goal for people over 60 should be a systolic pressure of less than 150. And the diastolic goal should remain less than 90.

Advertisement

Systolic blood pressure, the top number, indicates the pressure on blood vessels when the heart contracts. Diastolic, the bottom number, refers to pressure on blood vessels when the heart relaxes between beats.

The committee, composed of 17 academics, was tasked with updating guidelines formulated a decade ago. Their report was published online Wednesday in The Journal of the American Medical Association.

Get Ground Game in your inbox:
Daily updates and analysis on national politics from James Pindell.
Thank you for signing up! Sign up for more newsletters here

Hypertension experts said they did not have a precise figure on how many Americans would be affected by the new guidelines. But Dr. William White, president of the American Society of Hypertension, said it was “a huge number for sure.”

Dr. Paul A. James, chairman of the Department of Family Medicine at the University of Iowa and cochairman of the guidelines committee, said, “If you get patients’ blood pressure below 150, I believe you are doing as well as can be done based on scientific evidence.”

The group added that people older than 60 who are taking drugs and have lowered their blood pressure to less than 150 could continue taking the medications if they were not experiencing side effects.

Advertisement

But, it cautioned, although efforts to lower blood pressure have had a remarkable effect, reducing strokes and heart disease, there is a difference between lowering blood pressure with drugs and having lower pressure naturally.

Medications that lower blood pressure can have side effects that counteract some of the benefits, said Dr. Suzanne Oparil, cochairwoman of the committee and director of the vascular biology and hypertension program at the University of Alabama at Birmingham School of Medicine. For that reason, maximum benefits may occur with less intense treatment and higher blood pressure. “The mantra of blood pressure experts in the past has been that lower is better,” Oparil said. “Recent studies don’t seem to support that.”

For example, two Japanese studies found that older people who reduced their systolic pressure to less than 140 fared no better than those who reduced it to between 140 and 160, or between 140 and 149.

Some experts not on the committee say that the blood pressure guidelines are based on limited science — studies did not specifically test the effects of getting blood pressure below 140/90 — but that this does not mean that goal should be abandoned.

“When I discuss this with my colleagues and friends in the community, most are pretty livid,” said Dr. George Bakris, director of the hypertension center at the University of Chicago. “Is this the golden age of Sparta? What is going on?”

The old blood pressure targets made a huge difference in patients’ health, said Dr. Marvin Moser, a hypertension expert, who was chairman of the first blood pressure guidelines committee in 1977 and a member of the six committees after that, but not of the most recent one.

“The thing about hypertension is that it is a dull disease, but the results of treatment are spectacular,” he said. The incidence of strokes has fallen by 70 percent since 1972, and heart failure rates have fallen by more than 50 percent.

“It used to be that every third or fourth hospital bed had someone with hypertension in it,” Moser said. “Today it is very rare to find someone with malignant hypertension” — that is, dangerously high and uncontrolled blood pressure.

It is inexpensive now to treat the disorder, Moser added, because 90 percent of blood pressure drugs are available as generics.

But, James said, some people may be better off taking fewer drugs or lower doses. Many older people have a variety of chronic illnesses and take multiple medications, which can interact and potentially cause harm, he said.

Some people, too, end up with blood pressures so low when they stand that they get dizzy. “A lady who gets dizzy and falls and fractures her hip — that’s a terrible thing,” James said.

The guidelines committee’s paper is accompanied by three editorials, two of which praise the process.

The third — by Dr. Eric D. Peterson of Duke University, Dr. J. Michael Gaziano of the VA Boston Healthcare System and Brigham and Women’s Hospital, and Dr. Philip Greenland of Northwestern University — said the committee should have considered evidence that fell short of randomized, controlled clinical trials.

“We’re not starting from square one,” Gaziano said in a telephone interview. “We’ve got a history of how to manage patients. The bar for changing that should be pretty high.”

Loading comments...
Real journalists. Real journalism. Subscribe to The Boston Globe today.