Research Article

The Relationship between the 24 h Blood Pressure Variability and Carotid Intima-Media Thickness: A Compared Study

Table 1

Clinical characteristics of all the subjects and the two subgroups: normal IMT group and abnormal IMT group.

CharacteristicsAll subjects ( )IMT < 1.0 mm ( )IMT ≥ 1.0 mm ( )P value

Age (years)58.7 ± 12.152.4 ± 10.663.2 ± 11.10.000**
Male gender (%)53.338.564.70.273
Smoking (%)23.311.532.40.573
IMT ≥ 1.0 mm (%)56.70100<0.001**
Presence of plaque (%)46.719.267.6<0.001**
Hypertensive patients (%)76.769.282.40.196
CCA IMT (mm)0.9 ± 0.20.76 ± 0.111.08 ± 0.15<0.001**
Bulb IMT (mm)0.8 ± 0.30.62 ± 0.100.89 ± 0.29<0.001**
ICA IMT (mm)0.6 ± 0.10.54 ± 0.080.64 ± 0.10<0.001**
24 h SBP (mmHg)120.2 ± 16.3121.3 ± 17.4119.3 ± 15.60.813
24 h DBP (mmHg)76.6 ± 12.978.4 ± 14.475.2 ± 11.60.148
24 h PP (mmHg)43.6 ± 9.242.8 ± 7.644.1 ± 10.40.142
Daytime SBP (mmHg)121.2 ± 16.0122.1 ± 17.0120.4 ± 15.40.763
Daytime DBP (mmHg)77.5 ± 12.879.2 ± 14.276.2 ± 11.70.131
Daytime PP (mmHg)43.7 ± 9.143.0 ± 7.844.2 ± 10.10.125
Nighttime SBP (mmHg)116.7 ± 18.7118.6 ± 19.2115.2 ± 18.40.860
Nighttime DBP (mmHg)73.5 ± 13.676.1 ± 15.171.5 ± 12.20.204
Nighttime PP (mmHg)43.2 ± 10.442.4 ± 8.043.8 ± 11.90.234
SBP decrease (%)3.6 ± 6.83.5 ± 5.53.8 ± 7.80.838
DBP decrease (%)5.0 ± 6.94.5 ± 5.05.3 ± 8.10.723

IMT: intima-media thickness; CCA: common carotid artery; ICA: internal carotid artery; SBP: systolic blood pressure; DBP: diastolic blood pressure; PP: pulse pressure. **Correlation is significant at the 0.01 level.