Early Bradycardia Predicts Need for Positive Pressure Ventilation in Newborns

The Critical First Minutes: Assessing Neonatal Transition and Resuscitation

The transition from intrauterine to extrauterine life is a vulnerable period, with an estimated 10 million infants annually requiring assistance to breathe at birth [1]. Current neonatal resuscitation guidelines from organizations like the American Academy of Pediatrics recommend initial steps such as drying and tactile stimulation to trigger spontaneous breathing in non-breathing newborns [2]. While this fundamental intervention is widely applied to improve respiratory effort and vital signs [3, 4], a persistent clinical challenge is rapidly identifying which newborns will respond to stimulation alone and which require escalation to more advanced interventions like positive pressure ventilation [5]. A new study provides quantitative data on the physiological responses to these initial maneuvers, offering a clearer understanding of early indicators that can help optimize care and improve neonatal outcomes [6, 7].

Study Design and Data Collection Methods

To investigate real-world resuscitation practices and their physiological effects, researchers conducted a prospective observational study at the tertiary level Stavanger University Hospital in Norway. This study design allowed for the systematic collection of data on events as they occurred naturally in the delivery room, without altering clinical protocols. The study enrolled newborns with a gestational age of 34 weeks or greater between September 2022 and July 2024, focusing on a near-term and term infant population. This approach provided a robust dataset reflecting contemporary neonatal care in a high-resource setting.

To capture objective and granular data, the research team utilized a multi-modal monitoring strategy. The application and duration of tactile stimulation were registered using thermal videos in the delivery room and supplemented by visible light cameras positioned over resuscitation tables. This dual-video method provided a comprehensive, non-invasive record of all interventions. Critically, heart rate, the primary physiological outcome, was obtained using a dry-electrode electrocardiogram (ECG). This technology allows for rapid and continuous cardiac monitoring without the need for skin-abrading gels, a significant advantage when managing time-sensitive situations in newborns.

Intervention Patterns in the Delivery Room

The study's analysis of 449 newborns, for whom complete video and heart rate data were available, offers a detailed snapshot of initial resuscitation needs. The findings confirm that the majority of near-term and term infants transition successfully with minimal support. A notable portion, 70 of 449 newborns (16%), required no resuscitative interventions at all. The most common intervention was tactile stimulation, which alone was sufficient for 345 of 449 newborns (77%) to establish adequate spontaneous breathing. This reinforces the central role of stimulation in standard neonatal care.

A smaller, but clinically significant, group required more advanced respiratory support. Continuous positive airway pressure was administered to 14 newborns (3.1%), while a further 20 newborns (4.4%) required positive pressure ventilation (PPV). These figures quantify the typical distribution of interventions in this population and establish a baseline for understanding which infants ultimately deviate from the most common pathway of responding to stimulation alone.

Heart Rate Response to Tactile Stimulation

A central question addressed by the study was whether tactile stimulation elicits a measurable physiological response. The analysis demonstrated a direct and statistically significant effect of stimulation on neonatal heart rate. This effect was most pronounced in infants who were not yet hemodynamically vigorous. Specifically, among newborns with a heart rate below 140 beats per minute (bpm) at the time stimulation was initiated, the intervention was associated with a median heart rate increase of 7 bpm. This finding was highly significant (p<0.001), confirming that tactile stimulation provides a tangible cardiorespiratory benefit beyond simply being a noxious stimulus. The data suggest that this simple maneuver actively supports the physiological transition by helping to increase cardiac output in infants who may be experiencing a slower start.

Bradycardia as a Predictor for Advanced Resuscitation

Moving beyond the general response to stimulation, the researchers sought to identify an early, actionable signal for clinicians indicating the need for escalation. They tested the hypothesis that transient bradycardia in the first minute of life could predict the eventual need for positive pressure ventilation (PPV). The study defined this early warning sign specifically as a heart rate below 100 beats per minute (bpm) lasting for at least 10 seconds.

The findings established a strong predictive link. Newborns who experienced this brief period of bradycardia within the first minute of life had a four-fold increased likelihood of requiring PPV compared to infants who responded to tactile stimulation alone. This association was statistically robust (p=0.009). This result provides a clear, time-sensitive clinical marker. The presence of even transient bradycardia in the first 60 seconds appears to be a critical sign that an infant may not be able to recover with stimulation alone and is on a trajectory toward needing more definitive respiratory support.

Clinical Implications for Delivery Room Management

This study provides valuable, quantitative support for current neonatal resuscitation practices while also offering a key refinement for clinical decision-making. The findings confirm that tactile stimulation is not only the most frequently used intervention but is also physiologically effective, associated with a median heart rate increase of 7 bpm (p<0.001) in newborns with initial heart rates below 140 bpm. This validates its continued use as a first-line measure for the vast majority of infants who are slow to transition.

However, the most clinically actionable insight is the identification of a specific, early predictor for failure of stimulation. The observation that bradycardia (defined as HR <100 bpm for 10 seconds) in the first minute of life confers a four-fold likelihood of requiring positive pressure ventilation (p=0.009) gives clinicians a concrete data point to guide escalation of care. For the practicing physician, this means that while continuing to rely on stimulation, the appearance of this specific bradycardic pattern should be viewed as a critical signal to prepare for and potentially initiate PPV without delay. This evidence-based trigger can help ensure that the small subset of newborns who truly need advanced support receive it more promptly.

References

1. Lee AC, Cousens S, Wall S, et al. Neonatal resuscitation and immediate newborn assessment and stimulation for the prevention of neonatal deaths: a systematic review, meta-analysis and Delphi estimation of mortality effect. BMC Public Health. 2011. doi:10.1186/1471-2458-11-s3-s12

2. Lee H, Strand ML, Finan E, et al. Part 5: Neonatal Resuscitation: 2025 American Heart Association and American Academy of Pediatrics Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. PEDIATRICS. 2025. doi:10.1542/peds.2025-074352

3. Cramer SJE, Dekker J, Dankelman J, Pauws SC, Hooper SB, Pas ABT. Effect of Tactile Stimulation on Termination and Prevention of Apnea of Prematurity: A Systematic Review.. Frontiers in pediatrics. 2018. doi:10.3389/fped.2018.00045

4. Dekker J, Hooper SB, Martherus T, Cramer SJE, Geloven NV, Pas ABT. Repetitive versus standard tactile stimulation of preterm infants at birth – A randomized controlled trial. Resuscitation. 2018. doi:10.1016/j.resuscitation.2018.03.030

5. Boller M, Burkitt JM, Byers CG, et al. RECOVER Guidelines: Newborn Resuscitation in Dogs and Cats. Evidence and Knowledge Gap Analysis With Treatment Recommendations. Journal of Veterinary Emergency and Critical Care. 2025. doi:10.1111/vec.70012

6. Reco MDON, Soares DDA. Randomized Controlled Trial Protocol on the Effects of a Sensory Motor Intervention Associated with Kangaroo Skin-to-Skin Contact in Preterm Newborns. International Journal of Environmental Research and Public Health. 2024. doi:10.3390/ijerph21050538

7. Sweet DG, Carnielli V, Greisen G, et al. European Consensus Guidelines on the Management of Respiratory Distress Syndrome – 2019 Update. Neonatology. 2019. doi:10.1159/000499361