Table 1 Pre-operative measurements taken from CoA twin and control at 9 months of age

From: Hypertension and coarctation of the aorta: an inevitable consequence of developmental pathophysiology

Measured variable

CoA twin

Control twin

Weight (Kg)

10.2

10.8

BSA (m2)

0.47

0.51

BP (mm Hg)a

123/60

98/39

Arm PWV (ms−1)a

5.6

4.2

sBRS (ms mm Hg−1)a

5.2

16.8

CI (lm−2)a

3.4

3.8

HRV—RMSSD (ms)a

19.0

23.5

HRV—TP (ms2)a

48.9

58.0

HRV—LF (ms2)a

10.0

11.6

HRV—HF (ms2)a

24.7

31.7

HRV—LF/HFa

0.41

0.36

BPV—TP (mm Hg2)a

17.5

4.9

BPV—LF (mm Hg2)a

4.9

1.2

BPV—HF (mm Hg2)a

7.3

2.6

  1. Abbreviatons: BP, blood pressure; BSA, body surface area; CI, cardiac index; CoA, coarctation of the aorta; HF, high frequency; HRV, heart rate variability; LF, low frequency; PWV, pulse wave velocity; RMSSD, root mean squared difference of successive NN intervals; sBRS, spontaneous baroreceptor reflex sensitivity; TP, total power.
  2. aRepeated measures expressed as mean.