Pulse Oximetry Measures a Lower Heart Rate at Birth Compared with Electrocardiography

• Published in: The Journal of pediatrics Vol. 166; no. 1; pp. 49 - 53
• Main Authors: van Vonderen, Jeroen J., Hooper, Stuart B., Kroese, Jacco K., Roest, Arno A.W., Narayen, Ilona C., van Zwet, Erik W., te Pas, Arjan B.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.01.2015
• Subjects: Bradycardia - physiopathology; Electrocardiography - methods; Female; Heart Rate - physiology; Humans; Infant, Newborn; Infant, Premature; Male; Netherlands; Oximetry - methods; Pediatrics; Prospective Studies; Time Factors; Netherlands; HRECG; ECG; HRPO; HR; SIQ; bpm; PO; HR ECG; HR PO; HRs measured by electrocardiography; Heart rate; Beats per minute; Electrocardiography; Pulse oximetry; HRs measured with pulse oximetry; Signal identification and quality
• ISSN: 0022-3476; 1097-6833; 1097-6833
• DOI: 10.1016/j.jpeds.2014.09.015

To examine the effect of time after birth on heart rate (HR) measured by pulse oximetry (PO) (HRPO) and electrocardiography (ECG) (HRECG). HRECG and HRPO (collected at maximum sensitivity) were assessed in 53 term and preterm infants at birth. ECG electrodes and a PO sensor were attached as soon as possible and HRECG and HRPO were compared every 30 seconds from 1-10 minutes after birth. Data were compared using a Wilkinson signed-rank test. Clinical relevance (eg, HR <100 beats per minute [bpm] was tested using a McNemar test). Seven hundred fifty-five data pairs were analyzed. Median (IQR) gestational age was 37 (31-39) weeks. Mean (SD) starting time of PO and ECG data collection was 99 (33) vs 82 (26) seconds after birth (P = .001). In the first 2 minutes after birth, HRPO was significantly lower compared with HRECG (94 (67-144) vs 150 (91-153) bpm at 60 seconds (P < .05), 81 (60-109) vs 148 (83-170) bpm at 90 seconds (P < .001) and 83 (67-145) vs 158 (119-176) at 120 seconds (P < .001). A HR <100 bpm was more frequently observed with a PO than ECG in the first 2 minutes (64% vs 27% at 60 seconds (P = .05), 56% vs 26% at 90 seconds (P < .05) and 53% vs 21% at 120 seconds (P < .05). HR by ECG was verified by ultrasound for outflow from a subset of infants. In infants at birth, HRPO is significantly lower compared with ECG with clinically important differences in the first minutes.