Evaluation of inter- and intra-operator variability in a pulse wave velocity assessment device
DOI:
https://doi.org/10.25758/set.1671Keywords:
Inter-operator variability, Intra-operator variability, Pulsed wave velocity, Device validationAbstract
Background – Pulsed wave velocity (PWV) assessment devices are valuable instruments for the determination of the cardiovascular risk of each individual. PWV is one of the existing parameters in the guidelines for the management of hypertension. It’s important to evaluate inter and intra-operator variability so the devices can increase their value. This study aims to classify inter and intra-operator variability of the PWV assessment device, Complior® SP. Methods – Observational descriptive and transversal study was performed with a sample of 38 individuals aged between 18 and 30 years old, with no cardiovascular risk factors. The data collection was performed at the Lisbon School of Health Technology. The procedure was adapted from the ARTERY society protocol for the PWV measurement device validation. To evaluate the reproducibility of the device, the mean values obtained by two operators were compared. The device precision is classified as excellent if the difference of the mean values is <0.5m/s with standard deviation (SD) ≤0.8m/s, acceptable if <1.0m/s and SD ≤1.5m/s and poor if ≥1.0m/s or SD >1.5m/s. Results – Twenty-five female and 13 male individuals took part in this study with a mean age of 22.6±2.79 years old. For operator A (p=0.863) the mean values of PWV were 6.018±0.88m/s and for operator B were 6.115±1.03m/s. The PWV mean difference values between and SD between operators was 0.137±0.15m/s (p=0,245). Conclusion – The Complior® SP has excellent reproducibility and reduced intra and inter-operator variability, being considered valid for cardiovascular risk assessment.
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