and wait 60 seconds; otherwise, congestion of blood in the veins of the arm can cause subsequent diastolic readings to be falsely high.
Occasionally it may be necessary to take blood pressure both while lying down and standing, especially if the patient is on medication. Some antihypertensive drugs cause the blood pressure to drop suddenly when the patient stands, and this is called postural hypotension. In some patients over 65 years of age, markedly hardened vessels may require higher cuff pressures to stop the blood flow through the artery. This results in falsely high systolic pressure readings.

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