AHA hypertension: what patients should know

Hypertension often causes no noticeable symptoms, so a proper series of blood-pressure readings matters more than how you feel on a particular day.

Blood pressure records the force of blood against artery walls as the heart pumps and rests. A persistently raised reading can gradually strain the heart, blood vessels, brain, kidneys and eyes.

One elevated measurement does not by itself establish a diagnosis. Pain, stress, caffeine, exercise, a full bladder and an unsuitable cuff can alter a reading. A clinician may repeat measurements or recommend home monitoring before deciding what they mean.

Arrange a routine clinical review if readings stay raised. Bring a list of medicines and supplements, because decongestants, anti-inflammatory painkillers and some other products can affect blood pressure.

For home checks, sit quietly, support your back and arm, place the cuff on bare skin and record readings at consistent times. Do not stop prescribed medication because a reading improves. Regular movement, less dietary salt, adequate sleep, weight management where relevant, and avoiding tobacco all support control.

Call emergency services for chest pressure, severe breathlessness, fainting, a sudden severe headache, new confusion, loss of vision, facial droop, arm weakness or difficulty speaking. These symptoms require urgent assessment whether or not you have checked your blood pressure.

If a home monitor repeatedly shows a markedly elevated result but you feel well, remain seated, repeat it correctly after resting, and contact an urgent medical service for prompt instructions rather than changing doses yourself.

Ask what target is appropriate for you, whether home monitoring would help, how often to record readings, and whether kidney tests, an eye check or assessment for sleep apnoea is relevant. Also ask what to do after a missed dose or during an illness that causes vomiting or dehydration.