Tabriz University of Medical Sciences Journal of Cardiovascular and Thoracic Research 2008-5117 6 4 2014 12 27 Effect of peripheral edema on cuff-based/ oscillometric blood pressure measurements accuracy 217 221 10.15171/jcvtr.2014.015 EN Shamsi Ghaffari Majid Malaki Afshin Rezaeifar Shahin Abdollahi Fakhim Journal Article 10.15171/jcvtr.2014.015 2014 09 21 Introduction: Blood pressure( BP )measurement is essential for epidemiological studies and clinical decisions . It seems that tissue characters can effect on BP resultso and we try to find edema effect on BP measured by three methods of oscillometric , auscultation and arterial . Method and materials: Blood pressure of 55 children candidated for open heart surgery were measured and compared with three methods : Arterial as standard and reference ,oscillometric and auscultatory . Peripheral edema as an tissue character which defined as higher than +2 as marked edema and equal or lower than +2 considered as no edema . statistical method :Data expressed by Mean (95% of confidence interval(CI 95%). Comparison between two group was done by T independent test and ANOVA test for more than two groups. Mann whitney U and paired T test test used for serially comparisons of methods . P less than 0.05 is significant. Results: 55 children aged 29.4±3.9 months ,they divided to two groups 10 children with peripheral edema beyond 2+ and 45 cases without edema. Oscillometric method overestimate systolic BP the Mean (CI 95%) difference of arterial to oscillomeric was 4.8(8/-1 , p 0.02) in edematous and 4.2(7/1 p 0.004) in non edematous. In diastolic BP oscillometric method underestimate -9(-1.8/-16.5, p0.03) in edematous group and 2.6(-0.7/+5,p 0.2) in non edematous. Conclusion : Oscillometric device standards can not cover all special clinical conditions and age groups .It underestimate diastolic BP significantly in edematous children, it was 9.2 mmHg in average as our study.