[ Scientific Activity - Actividad Científica ] [ Brief Communications - Temas Libres ]Influence of age in the values obtained during blood pressure measurement done with two different types of sphygmomanometers.
Jesus Paulo César; Junqueira Jr Luiz F; Meneses Silvya C O; Carvalho Jane S; Jesus Cristine A C
Department of Internal Medicine and Department of
University of Brasilia
Introduction: The influence of age in Blood Pressure (BP) measured with different types of sphygmomanometers must be better defined.
Objective: To compare the age effect in BP values using 2 sphygmomanometers - Column of Mercury (CM) and Electronic for Finger (EF).
Subjects and Methods: We studied 166 volunteers (90/female; 76/male). The subjects were divided in 2 groups according to their ages: Group I (GI): <45 years old (134 subjects) and Group II (GII): ³ 45 years old (32 subjects). We did three BP measurements in each subject using each one of the two devices. Mean values of systolic BP (SBP) and diastolic BP (DBP) were compared intra and inter-group using t test. BP were correlated with Pearson test (a <0.05).
Results: Mean (± sd) values of SBP/DBP (mmHg) in GI were: a)CM= 108 (± 12.7)/71 (± 10.1) and b)EF= 114 (± 14.3)/72 (± 13.1); and in GII: a)CM= 126 (± 23.1)/83 (± 19.6) and b)EF= 124 (± 21.9)/81 (± 14.8), respectively. Comparing BP measurements inter-group (GI versus GII) we observed significant differences between mean values: SBP-CM/GI versus SBP-CM/GII (p<0.001); SBP-EF/GI versus SBP-EF/GII (p=0.02) and DBP-CM/GI versus DBP-CM/GII (p<0.001); DBP-EF/GI and DBP-EF/GII (p=0.003). Comparing intra-group - GI: we verified significant difference between the SBP means obtained with the two devices (p<0.001), no difference was observed in relation to DBP (p=0.40), in GII: no statistical differences were observed between SBP and DBP (p=0.75 and 0.53; respectively). The correlation coefficients between SBP and DBP measured with CM and EF in GI were 0.58 e 0.51 (p<0.001) respectively; and in GII were 0.41 and 0.58 (p=0.02 and p<0.001) respectively.
Conclusion: The observed differences between the mean SBP in this groups may derive from the alteration in arterial viscoelastic properties resulting from arterial aging. The correlation between SBP and DBP done with CM and EF were positive and weak, independently of age.
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