Prevention Magazine asked five top blood-pressure specialists and found out the five biggest mistakes doctors make in hypertension treatment-and what you can do to prevent them. Doctors Rely on Too Few Blood-Pressure Readings Here’s what happens. “Patients get one high reading. Their doctors put them on medication. They come back; they’re fine; the doctors say the medication has done the trick. But in many cases, if those people had come back even without medication, their pressures would have been fine;’ says Thomas G. Pickering, M.D., professor of medicine at the hypertension center at New York Hospital-Cornell Medical Center in Manhattan and author of Good News About High Blood Pressure (Simon & Schuster, 1996).
That’s because a blood-pressure reading is just one brief snapshot in time. One reading may not at all represent what’s going on most days. Government guidelines for treatment suggest multiple readings during each doctor’s visit.
“Even then, our research has shown that for some people, doctors’ readings are often the least representative of their overall level of blood pressure,” says Dr. Pickering. The reason: About 20 percent of people with high blood pressure suffer from “white-coat hypertension.” Doctors’ offices make them nervous.
Their blood pressure spikes. But they don’t usually need to be medicated. One way to get around that is to ask the doctor’s nurse or technician to take your blood pressure. Another is to take your own blood pressure. There are other reasons for blood-pressure spikes and you have to deal with these, too. And they’re sneaky. Your blood pressure can temporarily jump up-and show a spike on the pressure gauge-because you had a cup of coffee less than a half hour before the test. (It’s the caffeine that’s the culprit, so watch out for other sources, too.) You can also get an unusually high reading if, during a measurement, you talk or have a full bladder. Some over-the-counter medications, especially those with warnings for people with hypertension, may raise your BP, so be sure to tell your doctor if you’re taking any.
Another source of spikes is cuff size. Regardless of who takes your blood pressure, the wrong cuff size on the measuring device-often one too small-can throw your readings off. Say you have large, muscular arms. If you’re measured with a “regular” adult cuff when you need a “large;’ your readings may be falsely high. And misfits do happen. “What you really want is to have your arm fitted with the proper-sized cuff by your physician;’ says Donald J. DiPette, M.D., director of the division of general internal medicine, which includes the hypertension section, at the University of Texas Medical Branch at Galveston. A simple way to do this is to have your doctor measure the distance around the middle of your upper arm and select the size cuff that’s right for you. If your doctor notes your arm measurement in your chart, there’s no need to remeasure at every visit, unless your weight or the size of your muscles has changed significantly. Don’t be shy. You may have to speak up to get good BP measurements. That may mean reminding your doctor or his assistant to take more than one. If your initial readings are high, get another right before you leave-measurements taken at the end of the visit are often lower. Your doctor has to repeat these multiple readings over several visits and then average your results to better estimate your “true” blood pressure.
An alternative to this multiple-visit approach is 24-hour ambulatory monitoring. This involves wearing a small, comfortable monitor that automatically and consistently reads your pressure night and day, while you sleep and even at work-where telephones and deadlines can get your blood boiling. “This is actually the fastest way to get an accurate diagnosis,” says Sheldon G. Sheps, M.D., chief of the hypertension division at the Mayo Clinic in Rochester, Minnesota. “There’s also a big movement for home monitoring;’ says Dr. Pickering. You can buy manual or electronic home units that provide fairly reliable readings. (See “Your Monitor Options” on page 25.) With a home monitor, you can average out various readings taken during the course of a day. Your measures may very well be different in the morning and evening, at work and after exercise. But you’ll be able to get the total picture, especially if you track pressure for a few weeks and average out all the different readings.