A 26-year-old woman comes to the emergency department because of a 12-hour history of light-headedness and dizziness. She sits in the waiting room for 2 hours before a physician can see her. On standing, she feels faint and immediately returns to a seated position. Her blood pressure is 98/69 mm Hg and increases to 118/82 mm Hg within 5 minutes. The release of which of the following best explains these findings? A) Atrial natriuretic peptide B) Bradykinin C) Brain natriuretic peptide D) Insulin E) Norepinephrine
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Orthostatic hypotension occurs when there is a sudden drop in blood pressure upon standing, causing inadequate blood flow to the brain. In response to this drop in blood pressure, the body releases certain substances to help increase blood pressure and maintain Show more…
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