Serial measurements to diagnose hypertension

Ambulatory blood pressure monitoring is recommended when an accurate assessment of blood pressure is needed. As this is costly and time-consuming, Dutch researchers have been looking for a more convenient approach.

They studied 84 patients who had been referred for 24-hour ambulatory blood pressure monitoring. About half the patients were already taking antihypertensive drugs.

Before the patients began their monitoring, they had their blood pressures checked in a quiet room. It was measured every five minutes for 30 minutes, using the same automatic device that was to be used for 24-hour monitoring.

The systolic blood pressure measured in the clinic fell for the first three readings. They then settled to a plateau. Diastolic blood pressures followed a similar pattern. The mean blood pressure was the same at 15, 20, 25 and 30 minutes.

When the mean blood pressures were compared with those of ambulatory blood pressure monitoring, there was

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