Table 4 Central hemodynamic variables measured by tonometry at rest and by oscillometry during daytime ambulatory monitoring in 83 participants

From: 24-h ambulatory recording of aortic pulse wave velocity and central systolic augmentation: a feasibility study

 

Mean±s.d.

Absolute difference

Relative difference

 

Variable

TM

OM

Mean±s.d.

95% CI

Mean±s.d.

95% CI

P

Systolic BP, mm Hg

115.4±14.5

113.9±10.9

1.4±10.0

–0.7 to 3.7

0.9±8.9

–1.0 to 2.9

0.19

Diastolic BP, mm Hg

77.8±10.2

81.9±9.2

–4.0±7.3

–5.6 to –2.4

–5.3±9.2

–7.3 to –3.2

<0.0001

Pulse pressure, mm Hg

37.6±7.4

32.1±6.6

5.5±7.4

3.9 to 7.1

15.6±21.3

10.9 to 20.0

<0.0001

AI, %

26.5±12.6

25.3±7.2

0.7±9.3

–1.5 to 2.8

–13.2±65.5

–28.2 to 1.7

0.54

AI at 75 bpm, %

22.2±11.5

26.8±7.5

–4.6±9.4

–6.6 to –2.5

–14.0±142.9

–45.6 to 17.6

<0.0001

PWV, m s−1

7.9±2.1

7.4±1.6

0.6±1.3

0.3 to 0.9

6.5±15.1

3.2 to 10.0

0.0002

  1. Abbreviations: AI, augmentation index; BP, blood pressure; CI, confidence interval.
  2. TM (average of two readings) and OM (average of daytime ambulatory readings) refer to measurements obtained by the tonometric SphygmoCor technique at the radial artery or by the oscillometric Mobil-O-Graph monitor at the brachial artery, respectively. PWV is the carotid–femoral pulse wave velocity measured by TM (average of two readings) or aortic pulse wave velocity estimated by OM (average of daytime ambulatory readings).
  3. Relative difference was computed from paired readings as (TM–OM)/[(TM+OM)/2] × 100.
  4. P-values are for the differences between TM and OM.
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