Table 3 Heart rate, cardiac PVF and ASV obtained with data from the previous PC-MRI study.

From: Respiratory influence on cerebrospinal fluid flow – a computational study based on long-term intracranial pressure measurements

PatID

Heart rate (beats per minute)

Respiratory rate #(breaths per minute)

Cardiac PVF (mL/s)

ASV (μL)

Cardiac gradient*(mmHg/m)

Respiratory gradient# (mmHg/m)

Static gradient* (mmHg/m)

11

103

25

0.16

30.9

1.65

0.58

0.006

13

77

19

0.35

94.7

4.51

1.58

0.015

21

74

18

0.39

110.4

2.92

1.02

0.005

Avg.

85 ± 16

21 ± 4

0.30 ± 0.13

78.7 ± 42.1

3.03 ± 1.43

1.06 ± 0.50

0.009 ± 0.006

  1. The cardiac induced pressure gradient was computed with computational fluid dynamics. The respiratory rate and gradient were estimated on the assumption that the three patients in the PC-MRI study had the same ratio between the cardiac and respiratory components as the 9 patients included in the dICP analysis. The last row shows average and standard deviation of average values from each individual patient. All values in the table have been rounded after as exact computations as possible. PVF: peak volumetric flow rate. ASV: aqueductal stroke volume. *Estimated from computational fluid dynamics. #Estimated from average ratios between cardiac and respiratory frequency or gradients from ICP recordings.
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