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Table 3 Effect of Mental Stress on Carotid Artery Vascular Response

From: Cerebrovascular mental stress reactivity is impaired in hypertension

Variable

Normal (N = 20)

Hypertensive (N = 28)

 
 

Baseline

Peak

P-value

Baseline

Peak

P-value

P-value Normo v. Hyper

Systolic BP

118.2 ± 12.5

131.3 ± 22.1

0.0035

140.0 ± 22.2

155.3 ± 29.2

<.0001

0.5849

Diastolic BP

72.6 ± 9.7

78.5 ± 10.6

0.0029

82.2 ± 16.2

92.1 ± 18.2

<.0001

0.1241

Mean BP

87.6 ± 9.1

96.2 ± 11.4

0.0003

100.8 ± 16.5

113.7 ± 19.9

<.0001

0.2477

Heart Rate

69.1 ± 12.1

80.1 ± 16.6

<.0001

66.4 ± 12.6

77.4 ± 14.4

<.0001

0.9933

CA Diam

0.63 ± 0.06

0.66 ± 0.07

0.0001

0.69 ± 0.06

0.68 ± 0.07

0.0633

<.0001

PSV

72.2 ± 15.6

75.8 ± 13.2

0.1196

74.2 ± 17.9

70.2 ± 17.4

0.162

0.0495

EDV

19.2 ± 6.0

21.2 ± 5.0

0.0341

22.1 ± 5.7

22.0 ± 8.2

0.5868

0.0841

TAM

18.5 ± 4.9

22.7 ± 6.2

0.0008

19.6 ± 5.1

20.6 ± 8.8

0.4529

0.0764

RI

0.73 ± 0.08

0.72 ± 0.08

0.113

0.81 ± 0.23

0.74 ± 0.18

0.1574

0.338

PI

1.73 ± 0.60

1.51 ± 0.41

0.0581

1.95 ± 0.96

1.61 ± 0.81

0.0471

0.8033

Flow

351.4 ± 113.6

453.6 ± 136.2

<.0001

444.2 ± 142.9

458.1 ± 194.8

0.5851

0.0136

  1. Values are mean ± SD. Numbers in brackets represent number of participating subjects in each group. Data represents the effects of the mental stress task that produced the maximum increase in blood flow in the three groups. PSV, peak systolic velocity; EDV, end-diastolic velocity; TAM, time average mean velocity; RI, resistive index; PI, pulsatility index; TAM, time averaged mean velocity. Flow = 3.14× 60× (radius)2× TAM. Units same as in Tables 1 and 2.
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Cardiovascular Ultrasound

ISSN: 1476-7120

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