Noninvasive Continuous Arterial Blood Pressure Monitoring with Nexfin
Martina JR et al. – Arterial blood pressure can be measured noninvasively and continuously using physiologic pressure reconstruction. Changes in pressure can be followed and values are comparable to invasive monitoring.
Intra-arterial pressure (IAP) and noninvasive Nexfin arterial pressure (NAP) were measured in cardiothoracic surgery patients, because invasive pressures are available.
NAP-IAP differences were analyzed during 30min.
Tracking was quantified by within-subject precision (SD of individual NAP-IAP differences) and correlation coefficients.
The ranges of pressure change were quantified by within-subject variability (SD of individual averages of NAP and IAP).
Accuracy and precision were expressed as group average ±SD of the differences and considered acceptable when smaller than 5±8mmHg, the Association for the Advancement of Medical Instrumentation criteria.
NAP and IAP were obtained in 50 (34-83 yr, 40 men) patients.
For systolic, diastolic, mean arterial, and pulse pressure, median (25-75 percentiles) correlation coefficients were 0.96 (0.91-0.98), 0.93 (0.87-0.96), 0.96 (0.90-0.97), and 0.94 (0.85-0.98), respectively.
Within-subject precisions were 4±2, 3±1, 3±2, and 3±2mmHg, and within-subject variations 13±6, 6±3, 9±4, and 7±4mmHg, indicating precision over a wide range of pressures.
Group average ±SD of the NAP-IAP differences were -1±7, 3±6, 2±6, and -3±4mmHg, meeting criteria.
Differences were not related to mean arterial pressure or heart rate.
MDLinx connects healthcare professionals and patients to tomorrow's important medical news, while providing the pharmaceutical and healthcare industries with highly targeted interactive marketing, education, content, and medical research solutions.