Table 1 Mean values ± standard deviation of 20 in vitro Doppler flow measurements of the average peak velocity at each perfusion speed in glass pipes of 1.5 – 5.5 mm. The perfusion speed was adjusted up to 700 ml/min (2.5 – 5.5 mm diameter) and up to 200 ml/min in pipes of 1.5 mm diameter. The flow velocity was calculated of the blood flow (Perf.) and the luminal area of the pipe. The velocity value at the critical Reynolds number (
) is marked for each diameter.
) is marked for each diameter.From: Turbulent flow as a cause for underestimating coronary flow reserve measured by Doppler guide wire
Diameter: | 1.5 mm | 2.5 mm | 3.5 mm | 4.5 mm | 5.5 mm | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Velocity of CRN | 125.8 cm/s | 75.5 cm/s | 53.9 cm/s | 41.9 cm/s | 34.3 cm/s | ||||||||||
Perf. (ml/min) | Velocity (cm/s) | APV | Velocity (cm/s) | APV | Velocity (cm/s) | APV | Velocity (cm/s) | APV | Velocity (cm/s) | APV | |||||
|  |  | Mean | ± SD |  | Mean | ± SD |  | Mean | ± SD |  | Mean | ± SD |  | Mean | ± SD |
50 | 47.2 | 94.7 | ± 1.23 | 17.0 | 35.7 | ± 0.65 | 8.7 | 17.4 | ± 0.48 | 5.2 | 11.4 | ± 0.48 | 3.5 | 7.1 | ± 0.08 |
100 | 94.3 | 183.7 | ± 1.56 | 34.0 | 68.0 | ± 0.63 | 17.3 | 34.1 | ± 0.97 | 10.5 | 21.6 | ± 0.73 | 7.0 | 14.0 | ± 0.0 |
150 | 141.5 | 259.6 | ± 3.88 | 50.9 | 97.0 | ± 1.52 | 26.0 | 51.6 | ± 0.73 | 15.7 | 32.6 | ± 0.66 | 10.5 | 20.7 | ± 0.57 |
200 | 188.6 | 328.9 | ± 7.56 | 67.9 | 120.5 | ± 2.38 | 34.7 | 67.1 | ± 0.67 | 21.0 | 42.3 | ± 0.71 | 14.0 | 27.2 | ± 0.51 |
250 |  |  |  | 84.9 | 145.2 | ± 3.79 | 43.3 | 82.1 | ± 0.77 | 26.2 | 51.7 | ± 0.78 | 17.5 | 33.5 | ± 0.87 |
300 |  |  |  | 101.9 | 169.6 | ± 5.28 | 52.0 | 96.5 | ± 0.97 | 31.4 | 62.3 | ± 0.78 | 21.1 | 39.1 | ± 1.56 |
350 |  |  |  | 118.8 | 195.3 | ± 6.91 | 60.6 | 110.5 | ± 0.80 | 36.7 | 70.9 | ± 0.73 | 24.6 | 44.5 | ± 2.36 |
400 |  |  |  | 135.8 | 220.8 | ± 8.29 | 69.3 | 124.3 | ± 1.61 | 41.9 | 82.3 | ± 0.71 | 28.1 | 50.8 | ± 2.58 |
450 |  |  |  | 152.8 | 246.7 | ± 11.04 | 78.0 | 140.7 | ± 0.90 | 47.2 | 87.1 | ± 1.34 | 31.6 | 55.6 | ± 3.41 |
500 |  |  |  | 169.8 | 271.1 | ± 12.50 | 86.6 | 152.1 | ± 1.51 | 52.4 | 96.4 | ± 1.96 | 35.1 | 61.9 | ± 2.74 |
550 |  |  |  | 186.7 | 296.5 | ± 14.73 | 95.3 | 163.6 | ± 1.62 | 57.6 | 105.5 | ± 1.57 | 38.6 | 67.1 | ± 3.63 |
600 |  |  |  | 203.7 | 340.6 | ± 14.79 | 103.9 | 178.8 | ± 2.32 | 62.9 | 115.6 | ± 1.83 | 42.1 | 73.4 | ± 3.98 |
650 |  |  |  | 220.7 | 362.6 | ± 15.40 | 112.6 | 192.7 | ± 1.56 | 68.1 | 124.8 | ± 1.96 | 45.6 | 79.5 | ± 4.10 |
700 |  |  |  | 237.7 | 368.3 | ± 25.65 | 121.3 | 206.9 | ± 2.08 | 73.4 | 133.8 | ± 2.32 | 49.1 | 85.8 | ± 4.91 |