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Hypertension/High Blood Pressure Health Center

Using Internet, Apps to Manage BP Has Dangers: Study

Researchers find measurement errors, misleading information
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WebMD News from HealthDay

By Amy Norton

HealthDay Reporter

FRIDAY, May 16, 2014 (HealthDay News) -- People who turn to the Internet or iPhone apps for help in controlling their blood pressure may be led astray in some cases, two preliminary studies suggest.

In one study, researchers who did a sweep of YouTube videos on high blood pressure found that one-third offered "misleading" information. Most often, that meant the video advocated supplements or other alternative therapies that haven't been scientifically proven to lower blood pressure.

"It's quite concerning," said lead researcher Dr. Nilay Kumar, who is scheduled to present the findings Monday at the annual meeting of the American Society of Hypertension in New York City.

"The videos that were misleading seemed to get a lot more hits than the videos from authoritative sources," said Kumar, a physician with the Cambridge Health Alliance in Massachusetts.

Those authoritative sources included the American Heart Association, medical universities and professional medical societies, Kumar said.

The other study, scheduled for presentation at the same meeting, looked at the accuracy of two home blood pressure devices that people connect to their iPhones. In each case, an app keeps track of their numbers and can send the information to their doctor.

Overall, the study found, both devices were inaccurate when compared with traditional doctor's-office measurements. Across 112 readings taken by the same person, one device gave numbers that were too high -- by an average of 3 to 5 points -- while the other gave numbers that were 5 points too low.

The bottom line? The study "sends a loud and clear message that such technology needs to be vetted against the standard technology before accepting these blood pressure readings at face value," said Dr. Domenic Sica, president-elect of the American Society of Hypertension.

"This technology clearly needs better refinement," said Sica, who was not involved in either new study.

According to the U.S. Centers for Disease Control and Prevention, almost one-third of U.S. adults have high blood pressure. But only about half of them have the condition under control.

Elevated blood pressure increases your risk for heart disease and stroke, the leading causes of death in the United States.

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