The blood pressure, heart rate, and cerebral flow velocities in patients at presyncope during standing and head up tilt
| Standing (n = 10) | Head up tilt (n = 11) | ||||||
|---|---|---|---|---|---|---|---|
| Before presyncope | At presyncope | Before presyncope | At presyncope | ||||
| SBP (mmHg) | 123 (13) | 76 (22)2-165 | 117 (21) | 85 (19)2-165 | |||
| DBP (mmHg) | 77 (12) | 52 (21)2-150 | 75 (17) | 55 (15)2-150 | |||
| MBP (mmHg) | 96 (13) | 61 (23)2-160 | 88 (17) | 67 (17)2-150 | |||
| Heart rate (bpm) | 97 (15) | 89 (26)2-150 | 94 (15) | 86 (22)2-150 | |||
| MCAs (cm/s) | 60 (21) | 54 (17) | 61 (24) | 58 (21) | |||
| MCAd (cm/s) | 27 (10) | 12 (7)2-165 | 26 (14) | 11 (7)2-165 | |||
| MCAm (cm/s) | 37 (13) | 25 (8)2-160 | 37 (17) | 26 (10)2-160 | |||
| PI (unit) | 0.88 (0.16) | 1.88 (0.79)2-165 | 0.93 (0.11) | 1.99 (0.66)2-165 | |||
Data presented as mean (SD).
Compared with before presyncope:
↵2-150 p < 0.05;
↵2-160 p < 0.01;
↵2-165 p < 0.001
bpm, beats/minute; DBP, diastolic blood pressure; MBP, mean blood pressure; MCAd, middle cerebral artery diastolic blood flow velocity; MCAm, middle cerebral artery mean blood flow velocity; MCAs, middle cerebral artery systolic blood flow velocity; PI, pulsatility index; SBP, systolic blood pressure.