Fig. 2: Three examples of 24-hour ambulatory blood pressuring records, staring from about 10 A.M.

A. Diagrammatic representation of mean hourly systolic and diastolic blood pressures over a 24-hour period in persons with normal blood pressure (normotensive) and those with high blood pressure (hypertensive). (Reproduced from Hayreh et al.58)

B. Actual ambulatory blood pressure and heart rate monitoring records (based on individual readings) over a 24-hour period in a patient with non-arteritic AION in the right eye. The blood pressure is perfectly normal during the waking hours but shows a marked fall during sleep at night. (Reproduced from Hayreh et al.50)

C. Ambulatory BP and heart rate monitoring records over a 24-hour period in a patient on two regimens of verapamil (a calcium channel blocker) regimens, as indicated on the chart. The upper record shows that when she was using verapomil at bedtime, there was marked degree of fall of blood pressure during sleep which improved markedly on stopping the bedtime dose, as seen in the lower chart. (Reproduced from Hayreh et al.28)

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