![]() Study III: Bland-Altman analysis revealed a mean difference (95% limits of agreement) between Doppler-US and ECG HR of 1.5 (−16 to 19) bpm. Study II: The mean (SD) Doppler-US HR using AV and PV modes also showed no difference when compared to ECG HR. Measurements and Main Results: Study I: Mean (SD) Doppler-US HR at position A, B, and C showed no difference when compared to ECG HR. Comparisons were made between Doppler-US and the clinical gold standard for HR assessments, electrocardiography (ECG). ![]() Interventions: Study I: Doppler-US (USCOM ® 1A) HR was assessed on upper (A), middle (B), and lower (C) third of the sternum study II: Doppler-US HR was assessed using AV and PV examination modes study III: HR was assessed during asphyxia. Study I evaluated optimal transducer position, Study II compared aortic (AV) and pulmonary (PV) examination modes, and Study III examined accuracy during asphyxia, for HR assessment. We aimed to evaluate accuracy and optimal use of Doppler-US for HR assessments during neonatal asphyxia in a pre-clinical model.ĭesign: HR assessments were performed in 16 term newborn piglets that were anesthetized, intubated, and instrumented. While existing HR assessment methods have several limitations, the Doppler ultrasound (Doppler-US) might be a promising alternative. Accurate heart rate (HR) assessment guides resuscitation interventions, thereby reducing morbidities and mortality. Objectives: Approximately 10% of newborn infants require resuscitation at birth. 3Women and Children's Health Research Institute (WCHRI), University of Alberta, Edmonton, AB, Canada.2Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.1Centre for the Studies of Asphyxia and Resuscitation, Neonatal Research Unit, Royal Alexandra Hospital, Edmonton, AB, Canada.Johnson 1,2,3 Megan O'Reilly 1,2 Tze-Fun Lee 1,2 Maryna Yaskina 3 Po-Yin Cheung 1,2 Georg M.
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