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Background and Objective: A new noninvasive continuous blood pressure monitor (KKU-KMTL NICBP) has been developed using applanation tonometry principle and force sensing resistor. This study aimed to evaluate the validity, reliability of measurement in a cardiovascular model and intra-rater reliability in human.
Methods: Fluid pressure was measured continuously and simultaneously by KKU-KMITL NICBP and a standard pressure monitor while increasing the fluid circulating into the model 5 steps from 0.1-0.5 ml, and at constant volume of 0.1 ml, every 10 seconds 10 minutes a time, 10 times. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were recorded every minute for 10 minutes a time 2 times in 10 healthy volunteers (aged 23.09±1.45 years). Validity and reliability of measurements were analyzed by comparison, Pearson correlation coefficient (r) and intra-class correlation coefficient (ICC), coefficient of variation (CV) and mean difference between 2 measurements of Bland-Altman method.
Results: The results show no differences in pressure measured by the both monitors and has high correlation coefficient (r=0.997) in the model. The reliability of measurements was very good with ICC=0.998. Intra-rater reliability in human were good with ICC, CV were 0.825, 9.03 % for SBP and 0.775, 9.73% for DBP respectively. The mean difference between 2 measurements of SBP was 1.70 ± 3.86 mmHg and of DBP 0.7 ± 4.50 mmHg.
Conclusions: It is concluded that a new KKU-KMITL NICBP has a high validity and reliability of measurement in a cardiovascular model and good intra-rater reliability of blood pressure measurement in man. Further study is warrant.
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