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Figure 1 Hemodynamic response to NTG during the 60° tilt test. At 0 min, nitroglycerine is administered. (A) mean arterial pressure (MAP); (B) stroke volume (SV); (C) cardiac output (CO); (D) systemic vascular resistance (SVR); (E) heart rate (HR); (F) baroreflex sensitivity (BRS). Circles = minute averages and SEM. Open circles = negative tilt test; solid circles = positive tilt test.
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