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Which statement indicates a diagnosis of orthostatic hypotension?
a. The patient has a 20mmH decrease in the systolic blood pressure or a 10mmH decrease in the diastolic blood pressure when supine.
b. The patient has a 20mmH decrease in the systolic blood pressure or a 10mmH decrease in the diastolic blood pressure when standing.
c. The patient has a 20mmH increase in the systolic blood pressure or a 10mmH increase in the diastolic blood pressure when supine.
d. The patient has a 20mmH increase in the systolic blood pressure or a 10mmH increase in the diastolic blood pressure when standing.