Reversible postural orthostatic tachycardia syndrome

Figure 1 The significant increase in heart rate on head-up tilt (red line) associated with drop in systolic and diastolic blood pressure (in blue). Note the return of both heart rate and blood pressure on returning to supine position. MAP: Mean arterial pressure; reSYS (right Y-axis): Systolic blood pressure; reDIAS (left Y-axis): Diastolic blood pressure; HR: Heart rate; CSM: Carotid sinus massage.