A randomized trial of oropharyngeal airways to assist stabilization of preterm infants in the delivery room

Supraglottic airway in neonatal porcine model

BACKGROUND

Positive pressure ventilation (PPV) in the delivery room is routinely performed using a face mask attached to a ventilation device. In 2023, the Consensus of Science and Treatment Recommendations for neonatal resuscitation stated that a supraglottic airway (SGA) can be used for PPV if resources and training permits. However, there is very limited data on tidal volume (VT) delivery using SGAs. We aimed to compare VT delivery using five ventilation devices (i.e., self-inflating bag (SIB)), T-Piece resuscitator, flow-inflating bag (FIB), NextStepTM, and Fabian ventilator with an SGA at two compliance levels using a neonatal piglet model.

DESIGN/METHODS

Randomized crossover experimental animal trial using 10 mixed-breed neonatal piglets (1-3 days; 1.8-2.4 kg). Piglets were anesthetized, SGA placed, instrumented, and randomized to PPV for one minute with SIB with or without a respiratory function monitor (RFM), T-Piece resuscitator ± RFM, FIB ± RFM, NextStepTM, and Fabian Ventilator at two compliance levels. Compliance changes were achieved by placing a wrap around the piglets' chest and tightening it. Our primary outcome was targeted VT delivery of 5 mL/kg at 0.5 and 1.5 mL/cmH2O lung compliance.

RESULTS

At 0.5 mL/cmH2O compliance, mean(SD) expired VT with the NextStepTM was 5.0(0.1)mL/kg compared to Fabian 5.1(0.2), SIB 6.3(1.8), SIB + RFM 5.3(0.8), T-Piece 5.9(1.5), T-Piece+RFM 5.5(0.6), FIB 7.7(1.8), FIB + RFM 8.5(2.9)mL/kg. At 1.5 mL/cmH2O compliance, mean(SD) expired VT with the NextStepTM was 5.1(0.2)mL/kg compared to Fabian 5.1(0.2),SIB 11.6(3.4), SIB + RFM 7.1(1.8), T-Piece 9.8(1.8), T-Piece+RFM 7.9(1.3), FIB 12.6(3.2), FIB + RFM 9.2(1.4)mL/kg.

CONCLUSION

The NextStepTM provides consistent VT during PPV with little variation despite compliance changes. Clinical studies are warranted.

IMPACT

Current guidelines recommend fixed peak inflation pressure in resuscitation, linked to lung and brain injury. The NextStepTM Neonatal Resuscitator, a cost-effective device, offers volume-targeted positive pressure ventilation with consistent tidal volumes delivery. With two different compliances, the NextStepTM Neonatal Resuscitator delivered a consistent tidal volume similar to a mechanical ventilator. The NextStepTM Neonatal Resuscitator outperformed self-inflating or flow-inflating bags and T-Piece resuscitators to deliver targeted tidal volumes. The NextStepTM Neonatal Resuscitator could be an alternative ventilation device for neonatal resuscitation.

Positive Pressure Ventilation in Preterm Infants in the Delivery Room: A Review of Current Practices, Challenges, and Emerging Technologies

BACKGROUND

A major proportion of preterm neonates require positive pressure ventilation (PPV) immediately after delivery. PPV may be administered through a face mask (FM) or nasal prongs. Current literature indicates that either of these are associated with similar outcomes.

SUMMARY

Nonetheless, FM remains the most utilized and the best choice. However, most available FM sizes are too large for extremely preterm infants, which leads to mask leak and ineffective PPV. Challenges to providing effective PPV include poor respiratory drive, complaint chest wall, weak thoracic muscle, delayed liquid clearance, and surfactant deficiency in preterm infants. Mask leak, airway obstruction, poor technique, and inappropriate size are correctable causes of ineffective PPV. Visual assessment of chest rise is often used to assess the efficacy of PPV. However, its accuracy is debatable. Though end tidal CO2 may adjudge the effectiveness of PPV, clinical studies are limited. The compliance of a preterm lung is highly dynamic. The inflating pressure set on T-piece is constant throughout the resuscitation, but the lung volume and dynamics changes with every breath. This leads to huge fluctuations of tidal volume delivery and can trigger inflammatory cascade in preterm infants leading to brain and lung injury. Respiratory function monitoring in the delivery room has potential for guiding and optimizing delivery room resuscitation. This is, however, limited by high costs, complex information that is difficult to interpret during resuscitation, and absence of clinical trials.

KEY MESSAGES

This review summarizes the existing literature on PPV in preterm infants, the various aspects related to it such as the pathophysiology, interfaces, devices utilized to deliver it, appropriate technique, emerging technologies, and future directions.

Alternatives to neonatal intubation

Opportunities to learn and maintain competence in neonatal intubation have decreased. As many clinicians providing care to the newborn infant are not skilled in intubation, alternative strategies are critical. Most preterm infants breathe spontaneously, and require stabilisation rather than resuscitation at birth. Use of tactile stimulation, deferred cord clamping, and avoidance of hypoxia can help optimise breathing for these infants. Nasal devices appear a promising alternative to the face mask for early provision of respiratory support. In term and near-term infants, supraglottic airways may be the most effective initial approach to resuscitation. Use of supraglottic airways during resuscitation can be taught to a range of providers, and may reduce need for intubation. While face mask ventilation is an important skill, it is challenging to perform effectively. Identification of the best approach to training the use of these devices during neonatal resuscitation remains an important priority.

Heart Rate Changes following Facemask Placement in Infants Born at ≥32+0 Weeks of Gestation

INTRODUCTION

Recent reports have raised concerns of cardiorespiratory deterioration in some infants receiving respiratory support at birth. We aimed to independently determine whether respiratory support with a facemask is associated with a decrease in heart rate (HR) in some late-preterm and term infants.

METHODS

Secondary analysis of data from infants born at ≥32+0 weeks of gestation at 2 perinatal centres in Melbourne, Australia. Change in HR up to 120 s after facemask placement, measured using 3-lead electrocardiography, was assessed every 3 s until 60 s and every 5 s thereafter from video recordings.

RESULTS

In the 15 s after facemask placement, 10/68 (15%) infants had a decrease in mean HR by >10 beats per minute (bpm) compared with their individual baseline mean HR in the 15 s before facemask placement. In 4 (6%) infants, HR decreased to <100 bpm. Nine out of 68 (13%) infants had an increase in mean HR by >10 bpm; 7 of these infants had a baseline HR <120 bpm. In univariable comparisons, the following characteristics were found not to be risk factors for a decrease in HR by >10 bpm: prematurity; type of respiratory support; hypoxaemia; early cord clamping; mode of birth; HR <120 bpm before mask placement. Six out of 63 infants (10%) who had HR ≥120 bpm after facemask placement had a late decrease in HR to <100 bpm between 30 and 120 s after facemask placement.

CONCLUSION

Facemask respiratory support at birth is temporally associated with a decrease in HR in a subset of late-preterm and term infants.

Guedel oropharyngeal airway: The validation of facial landmark-distances to estimate sizing in children - Visualisation by magnetic resonance imaging (GUEDEL-I): A prospective observational study

OBJECTIVE

To validate the ERC-recommended facial landmark-distance for oropharyngeal airway sizing in children.

METHODS

We conducted a prospective observational study in anaesthetised, spontaneously breathing children ≤12 years undergoing cranial MRI. Oropharyngeal airways were inserted following the distance from the maxillary incisors to the mandibular angle. Primary outcome was the rate of properly sized oropharyngeal airways on MRI, defined as the distal end positioned within 10 mm from the epiglottis without contacting it. Secondary outcomes were the occurrence of tongue protrusion, oropharyngeal airways clinical efficacy, and related adverse events. Furthermore, we calculated probabilities for the estimation of proper size when considering five facial landmark-distances and optimal rules based on biometric parameters.

RESULTS

In 94 children with a mean (SD) age of 4.7 (±3) years, 47.9% [95%-CI 38%-57.9%] oropharyngeal airways were properly sized, while 23.4% [95%-CI 15.9%-33%] were undersized, and 28.7% [95%-CI 20.5%-38.7%] oversized. Tongue protrusion occurred in 59.1% [95%-CI 38.2%-77.2%] of undersized and 15.6% [95%-CI 7.6%-29.2%] of properly sized oropharyngeal airways. No oropharyngeal airway required replacement. Comparing probabilities for five landmark-distances, "maxillary incisors to the angle of the mandible" proved superior for proper sizing at 41.2% [95%-CI 32%-51.7%]. The best-fit formula was "22.43 + 17.54 × log(weight[kg])" with a probability of 61.7% [95%-CI 51.5%-70.9%].

CONCLUSION

Although the facial landmark-distance "maxillary incisors to the angle of the mandible" does not reliably predict oropharyngeal airway size, no clinical problems have been encountered. Since it can be considered the least inaccurate facial landmark-distance, it can serve as an approximation, but the efficacy of oropharyngeal airways should be evaluated clinically.

REGISTERED CLINICAL TRIAL

German Clinical Trials Register; DRKS00025918.

One-person versus two-person mask ventilation in preterm infants at birth: a pilot randomised controlled trial

BACKGROUND

Mask leak and airway obstruction are common with mask ventilation in newborn infants, leading to suboptimal ventilation. We aimed to perform a pilot study measuring respiratory mechanics during one-person and two-person mask ventilation in preterm infants at birth.

METHODS

Infants less than 30 weeks' gestation were eligible for the study. In the two-person method, one person holds the mask in place and the other provides positive pressure ventilation compared with the standard one-person mask hold. A respiratory function monitor was used in line with a T-piece resuscitator to measure mask leak and airway obstruction. Deferred consent was obtained.

RESULTS

Twenty-five infants were recruited. The mean (SD) birth weight was 920.4 g (188.3), and mean (SD) gestational age was 27.3 weeks (3.0). Percentage mask leak was higher in the one-person mask method (26.4±18.5) compared with the two-person mask method (17.6±9.3) (p=0.018). The mean (SD) expired tidal volume (V_Te, mL) in breaths with leak was 3.9 (1.57) in the one-person method compared with 3.05 (1.0) the two-person method (p=0.31). A significantly lower mean (SD) end-tidal carbon dioxide (EtCO_2, mm Hg) was measured at 25.3 (9.9) in breaths with mask leak, compared with 30.8 (12.1) in breaths without leak. The breaths with airway obstruction had lower mean EtCO₂ (25.9 vs 30.8, p=0.003) and lower mean V_Te (1.71 vs 6.95, p<0.001).

CONCLUSION

Mask leak and airway obstruction are common in resuscitation of preterm infants at birth. The use of the two-person mask technique is effective and it could be a useful option if mask ventilation with the one-person method is not effective.

TRIAL REGISTRATION NUMBER

ACTRN12614000245695.

Tidal volumes during delivery room stabilization of (near) term infants

BACKGROUND

We sought to assess tidal volumes in (near) term infants during delivery room stabilization.

METHODS

Secondary analysis of a prospective study comparing two facemasks used for positive pressure ventilation (PPV) in newborn infants ≥ 34 weeks gestation. PPV was provided with a T-piece device with a PIP of 30 cmH2O and positive end-expiratory airway pressure of 5 cmH2O. Expired tidal volumes (Vt) were measured with a respiratory function monitor. Target range for Vt was defined to be 4 - 8 ml/kg.

RESULTS

Twenty-three infants with a median (IQR) gestational age of 38.1 (36.4 - 39.0) weeks received 1828 inflations with a median Vt of 4.6 (3.3 - 6.2) ml/kg. Median Vt was in the target range in 12 infants (52%), lower in 9 (39%) and higher in 2 (9%). Thirty-six (25-27) % of the inflations were in the target rage over the duration of PPV while 42 (25 - 65) % and 10 (3 - 33) % were above and below target range.

CONCLUSIONS

Variability of expiratory tidal volume delivered to term and late preterm infants was wide. Reliance on standard pressures and clinical signs may be insufficient to provide safe and effective ventilation in the delivery room.

TRIAL REGISTRATION

This is a secondary analysis of a prospectively registered randomized controlled trial (ACTRN12616000768493).

Wenn die Maskenbeatmung beim Neugeborenen schwierig ist

Die entscheidende und zumeist einzig notwendige Maßnahme für die erfolgreiche Reanimation eines Neugeborenen nach der Geburt ist die effektive Ventilation der Lunge [1]. Bereits eine kurze Maskenbeatmung führt, bei einem zunächst nicht oder nicht suffizient spontan atmenden Neugeborenen, in den meisten Fällen zum Einsetzen einer effektiven Eigenatmung und damit zu einer raschen klinischen Stabilisierung. In den meisten Fällen gelingt eine Maskenbeatmung problemlos, allerdings bereitet sie immer wieder auch Schwierigkeiten.

In Kursen, die sich mit der Versorgung des kritisch kranken Neugeborenen befassen (u. a. die Newborn-Life-Support-Kurse des Austrian Resuscitation Council (ARC), des German Resuscitation Council (GRC) und der Deutschen Interdisziplinären Vereinigung für Intensiv- und Notfallmedizin (DIVI)) [2], liegt daher ein Schwerpunkt auf Maßnahmen zur Optimierung einer nichtinvasiven Beatmung, die häufig nur unzureichend bekannt sind.

Dieser Artikel widmet sich Strategien, wie eine nichtinvasive Beatmung beim Neugeborenen optimiert werden kann, und schlägt mit dem deutschsprachigen Akronym „RALPH“ eine Möglichkeit vor, wie Schwierigkeiten bei der Maskenbeatmung strukturiert und zielgerichtet überwunden werden können.

Effects of tactile stimulation on spontaneous breathing during face mask ventilation

OBJECTIVE

We sought to determine the effect of stimulation during positive pressure ventilation (PPV) on the number of spontaneous breaths, exhaled tidal volume (VTe), mask leak and obstruction.

DESIGN

Secondary analysis of a prospective, randomised trial comparing two face masks.

SETTING

Single-centre delivery room study.

PATIENTS

Newborn infants ≥34 weeks' gestation at birth.

METHODS

Resuscitations were video recorded. Tactile stimulations during PPV were noted and the timing, duration and surface area of applied stimulus were recorded. Respiratory flow waveforms were evaluated to determine the number of spontaneous breaths, VTe, leak and obstruction. Variables were recorded throughout each tactile stimulation episode and compared with those recorded in the same time period immediately before stimulation.

RESULTS

Twenty of 40 infants received tactile stimulation during PPV and we recorded 57 stimulations during PPV. During stimulation, the number of spontaneous breaths increased (median difference (IQR): 1 breath (0-3); p_adj<0.001) and VTe increased (0.5 mL/kg (-0.5 to 1.7), p_adj=0.028), whereas mask leak (0% (-20 to 1), p_adj=0.12) and percentage of obstructed inflations (0% (0-0), p_adj=0.14) did not change, compared with the period immediately prior to stimulation. Increased duration of stimulation (p_adj<0.001) and surface area of applied stimulus (p_adj=0.026) were associated with a larger increase in spontaneous breaths in response to tactile stimulation.

CONCLUSIONS

Tactile stimulation during PPV was associated with an increase in the number of spontaneous breaths compared with immediately before stimulation without a change in mask leak and obstruction. These data inform the discussion on continuing stimulation during PPV in term infants.

TRIAL REGISTRATION NUMBER

Australian and New Zealand Clinical Trial Registry (ACTRN12616000768493).

Safe emergency neonatal airway management: current challenges and potential approaches

This review examines the airway adjuncts currently used to acutely manage the neonatal airway. It describes the challenges encountered with facemask ventilation and intubation. Evidence is presented on how to optimise intubation safety and success rates with the use of videolaryngoscopy and attention to the intubation environment. The supraglottic airway (laryngeal mask airway) is emerging as a promising neonatal airway adjunct. It can be used effectively with little training to provide a viable alternative to facemask ventilation and intubation in neonatal resuscitation and be used as an alternative conduit for the administration of surfactant.

Delivery Room Care for Premature Infants Born after Less than 25 Weeks' Gestation-A Narrative Review

Premature infants born after less than 25 weeks' gestation are particularly vulnerable at birth and stabilization in the delivery room (DR) is challenging. After birth, infants born after <25 weeks' gestation develop respiratory and hemodynamic instability due to their immature physiology and anatomy. Successful stabilization at birth has the potential to reduce morbidities and mortalities, while suboptimal DR care could increase long-term sequelae. This article reviews current neonatal resuscitation guidelines and addresses challenges during DR stabilization in extremely premature infants born after <25 weeks' gestation at the threshold of viability.

A multi-centre randomised controlled trial of respiratory function monitoring during stabilisation of very preterm infants at birth

AIM

To determine whether the use of a respiratory function monitor (RFM) during PPV of extremely preterm infants at birth, compared with no RFM, leads to an increase in percentage of inflations with an expiratory tidal volume (Vte) within a predefined target range.

METHODS

Unmasked, randomised clinical trial conducted October 2013 - May 2019 in 7 neonatal intensive care units in 6 countries. Very preterm infants (24-27 weeks of gestation) receiving PPV at birth were randomised to have a RFM screen visible or not. The primary outcome was the median proportion of inflations during manual PPV (face mask or intubated) within the target range (Vte 4-8 mL/kg). There were 42 other prespecified monitor measurements and clinical outcomes.

RESULTS

Among 288 infants randomised (median (IQR) gestational age 26⁺² (25⁺³-27⁺¹) weeks), a total number of 51,352 inflations were analysed. The median (IQR) percentage of inflations within the target range in the RFM visible group was 30.0 (18.0-42.2)% vs 30.2 (14.8-43.1)% in the RFM non-visible group (p = 0.721). There were no differences in other respiratory function measurements, oxygen saturation, heart rate or FiO₂. There were no differences in clinical outcomes, except for the incidence of intraventricular haemorrhage (all grades) and/or cystic periventricular leukomalacia (visible RFM: 26.7% vs non-visible RFM: 39.0%; RR 0.71 (0.68-0.97); p = 0.028).

CONCLUSION

In very preterm infants receiving PPV at birth, the use of a RFM, compared to no RFM as guidance for tidal volume delivery, did not increase the percentage of inflations in a predefined target range.

TRIAL REGISTRATION

Dutch Trial Register NTR4104, clinicaltrials.gov NCT03256578.

European Resuscitation Council Guidelines 2021: Newborn resuscitation and support of transition of infants at birth

The European Resuscitation Council has produced these newborn life support guidelines, which are based on the International Liaison Committee on Resuscitation (ILCOR) 2020 Consensus on Science and Treatment Recommendations (CoSTR) for Neonatal Life Support. The guidelines cover the management of the term and preterm infant. The topics covered include an algorithm to aid a logical approach to resuscitation of the newborn, factors before delivery, training and education, thermal control, management of the umbilical cord after birth, initial assessment and categorisation of the newborn infant, airway and breathing and circulation support, communication with parents, considerations when withholding and discontinuing support.

[Newborn resuscitation and support of transition of infants at birth]

The European Resuscitation Council has produced these newborn life support guidelines, which are based on the International Liaison Committee on Resuscitation (ILCOR) 2020 Consensus on Science and Treatment Recommendations (CoSTR) for Neonatal Life Support. The guidelines cover the management of the term and preterm infant. The topics covered include an algorithm to aid a logical approach to resuscitation of the newborn, factors before delivery, training and education, thermal control, management of the umbilical cord after birth, initial assessment and categorisation of the newborn infant, airway and breathing and circulation support, communication with parents, considerations when withholding and discontinuing support.

Delivery Room Management of Asphyxiated Term and Near-Term Infants

Approximately 800,000 newborns die annually due to birth asphyxia. The resuscitation of asphyxiated term newly born infants often occurs unexpected and is challenging for healthcare providers as it demands experience and knowledge in neonatal resuscitation. Current neonatal resuscitation guidelines often focus on resuscitation of extremely and/or very preterm infants; however, the recommendations for asphyxiated term newborn infants differ in some aspects to those for preterm infants (i.e., respiratory support, supplemental oxygen, and temperature management). Since the update of the neonatal resuscitation guidelines in 2015, several studies examining various resuscitation approaches to improve the outcome of asphyxiated infants have been published. In this review, we discuss current recommendations and recent findings and provide an overview of delivery room management of asphyxiated term newborn infants.