Heart Rate Assessment during Neonatal Resuscitation

Separation of thoracic and abdominal measurements in neonatal vital sign monitoring using radar vision fusion system

Non-contact, rapid and accurate measurement of respiratory rates (RR) and heart rates (HR) in neonates has significant clinical importance. Existing methods predominantly focus on thoracic respiratory signal measurement. This thoracic-focused approach, when applied to neonates who exhibit predominantly abdominal breathing, leads to a low signal-to-interference ratio (SIR) that compromises the accuracy of RR measurement compared with using abdominal signal. Moreover, neonatal and staff motion in clinical environments pose challenges for the robustness of monitoring systems. In this paper, a method for the separation of thoracic and abdominal measurements based on MIMO radar is proposed to make use of the RR information contained within the abdominal signal, while extracting HR information from thoracic signal, in which case RR can be extracted more precisely from abdominal signal with a high SIR. In order to ensure proper separation of radar beams under the interference from neonatal and staff motion, this paper presents an integrated measurement system that combines a monocular camera and MIMO radar to achieve precise and real-time guidance for the radar beams. Experimental results demonstrate significant improvements in RR measurement accuracy and system robustness. We report maximum root mean square errors of 2.16 Beats Per Minute(BPM) for RR measurements and 3.54 BPM for HR measurements.

Combining activity and grimace scores reflects perinatal stability in infants <32 weeks gestational age

BACKGROUND

Over 95% of infants less than 32 weeks gestational age-very preterm infants (VPTI)-require cardiorespiratory support at birth. Clinical condition at birth is assessed by the Apgar score, but the precision and accuracy of activity and grimace has not been evaluated. We hypothesised activity and grimace could predict the level of cardiorespiratory support required for stabilisation.

METHODS

Two hundred twenty-nine videos of VPTI resuscitations at Monash Children's Hospital and The Royal Women's Hospital, Melbourne were evaluated, with 78 videos eligible for assessment. Activity and grimace were scored (0, 1, or 2) by seven consultant neonatologists, with inter-rater reliability assessed. Activity and grimace were correlated with the maximum level of cardiorespiratory support required for stabilisation.

RESULTS

Kendall's Coefficient of Concordance (W) showed strong interobserver agreement for activity (W = 0.644, p < 0.001) and grimace (W = 0.722, p < 0.001). Neither activity nor grimace independently predicted the level of cardiorespiratory support required. Combining activity and grimace showed non-vigorous infants (combined score <2) received more cardiorespiratory support than vigorous (combined score ≥ 2).

CONCLUSION

Scoring of activity and grimace was consistent between clinicians. Independently, activity and grimace did not correlate with perinatal stabilisation. Combined scoring showed non-vigorous infants had greater resuscitation requirements.

IMPACT

Our study evaluates the precision and accuracy of activity and grimace to predict perinatal stability, which has not been validated in infants <32 weeks gestational age. We found strong score agreement between assessors, indicating video review is a practical and precise method for grading of activity and grimace. Combined scoring to allow a dichotomous evaluation of infants as non-vigorous or vigorous showed the former group required greater cardiorespiratory support at birth.

Does ECG monitoring affect resuscitation for neonates with pulseless electrical activity in the delivery room? A simulated, pilot, crossover randomised trial

OBJECTIVE

To evaluate whether ECG monitoring impacts resuscitative steps during simulated neonatal resuscitation in the setting of pulseless electrical activity (PEA) in the delivery room.

DESIGN

This pilot, crossover randomised controlled trial recruited providers in teams of three who participated in two simulation scenarios (PEA with and without ECG monitoring). Teams were randomised to one scenario and then crossed over. All sessions were video-recorded. The primary outcome was time to pulse check once the manikin was programmed to become pulseless. The secondary outcomes were total pulse checks, time to positive pressure ventilation, intubation, chest compressions and administration of epinephrine, and teams' quotes and behaviours during resuscitation. The primary outcome was analysed using Kaplan-Meier survival curve. The secondary outcomes were compared with Wilcoxon signed-rank test. The quotes were analysed using content analysis with pattern coding.

RESULTS

Eighty-two healthcare providers were approached and 30 consented (10 teams). The mean time to check the pulse once the manikin was pulseless was 38.5 s (SD 30.1) without ECG vs 88.1 s (SD 46.1) with ECG (p<0.01). There was a significantly decreased number of pulse checks with the ECG compared with without (p<0.01). Time to intubation, chest compressions, start of positive pressure ventilation and epinephrine administration was not different between the groups. Quotes/behaviours revealed false reassurance and over-reliance on ECG monitoring, repeated pulse check errors and troubleshooting behaviours.

CONCLUSIONS

ECG monitoring in simulated neonatal resuscitation results in delayed recognition of a pulseless state, decreased number of pulse checks and a possible false sense of security. Simulated resuscitation clinical endpoints are unaffected.

Prevalence of bradycardia in 4876 newborns in the first minute after birth and association with positive pressure ventilation: a population-based cross-sectional study

OBJECTIVE

To determine the prevalence of bradycardia in the first minute after birth and association with positive pressure ventilation (PPV).

METHOD

A population-based cross-sectional study was conducted from June 2019 to December 2021 at Stavanger University Hospital, Norway. Parents consented to participation during pregnancy, and newborns ≥28 weeks' gestation were included at birth. Heart rate (HR) was captured immediately after birth and continuously for the first minute(s). Time of birth was registered on a tablet. Provision of PPV was captured using video.

RESULTS

Of 4876 included newborns, 164 (3.4%) did not breathe (two-thirds) or breathed ineffectively (one-third) and received PPV at birth. HR in the first minute had a wide distribution. The prevalence of first measured HR <100 and <60 beats/minute at median 16 s was 16.3% and 0.6%, respectively. HR increased in most cases. At 60 s, 3.7% had HR <100 beats/minute, of which 82% did not require PPV. In total, 25% of newborns had some registered HR <100 beats/minute during the first minute, of which 95% did not require PPV. Among newborns who received PPV, 76% and 62% had HR ≥100 beats/minute at 60 s and at start PPV, respectively.

CONCLUSION

Bradycardia with HR <100 bpm in the first minute of life was frequent, but mostly self-resolved. Among the 4% of newborns that remained bradycardic at 60 s, only 20% received PPV. Two-thirds of resuscitated newborns had HR ≥100 beats/minute at start PPV. None of the ventilated newborns were breathing adequately at start PPV.

TRIAL REGISTRATION NUMBER

NCT03849781.

Amplification of Heart Sounds Using Digital Stethoscope in Simulation-Based Neonatal Resuscitation

OBJECTIVE

The accuracy, timeliness, and reliability of the current methods of heart rate (HR) determination in neonatal resuscitation are debatable, each having its own limitations. We aim to compare three methods of HR assessment: (1) traditional stethoscope, (2) electrocardiogram and traditional stethoscope, and (3) digital stethoscope with loudspeaker amplification of heart sounds.

STUDY DESIGN

This was a simulated crossover experiment using a high-fidelity manikin. Each team with a physician, a nurse, and a respiratory therapist performed the resuscitations using the three methods (three different scenarios) in different order. The person controlling the HR via manikin controller was blinded, but the single recorder and the providers were not.

RESULTS

Eighteen resuscitations were completed (six teams of three methods each). The time to first HR recording (p < 0.001), total number of HR recorded (p < 0.001), and time to recognize dips in HR was significantly improved in the digital stethoscope group (p = 0.009).

CONCLUSION

Use of digital stethoscope with amplification improved documentation of HR and earlier recognition of HR changes.

KEY POINTS

· Amplified heartbeats during neonatal resuscitation improved documentation.. · Amplified infant heartbeats resulted in earlier recognition of HR changes (increase or decrease).. · Providers using this method had greater satisfaction..

Evaluating a Novel Infant Heart Rate Detector for Neonatal Resuscitation Efforts: Protocol for a Proof-of-Concept Study

BACKGROUND

Over 10 million newborns worldwide undergo resuscitation at birth each year. Pediatricians may use electrocardiogram (ECG), pulse oximetry (PO), and stethoscope in determining heart rate (HR), as HR guides the need for and steps of resuscitation. HR must be obtained quickly and accurately. Unfortunately, the current diagnostic modalities are either too slow, obtaining HR in more than a minute, or inaccurate. With time constraints, a reliable robust heart rate detector (HRD) modality is required. This paper discusses a protocol for conducting a methods-based comparison study to determine the HR accuracy of a novel real-time HRD based on 3D-printed dry-electrode single-lead ECG signals for cost-effective and quick HR determination. The HRD's HR results are compared to either clinical-grade ECG or PO monitors to ensure robustness and accuracy.

OBJECTIVE

The purpose of this study is to design and examine the feasibility of a proof-of-concept HRD that quickly obtains HR using biocompatible 3D-printed dry electrodes for single-lead neonatal ECG acquisition. This study uses a novel HRD and compares it to the gold-standard 3-lead clinical ECG or PO in a hospital setting.

METHODS

A cross-sectional study is planned to be conducted in the neonatal intensive care unit or postpartum unit of a large community teaching hospital in Toronto, Canada, from June 2023 to June 2024. In total, 50 newborns will be recruited for this study. The HRD and an ECG or PO monitor will be video recorded using a digital camera concurrently for 3 minutes for each newborn. Hardware-based signal processing and patent-pending embedded algorithm-based HR estimation techniques are applied directly to the raw collected single-lead ECG and displayed on the HRD in real time during video recordings. These data will be annotated and compared to the ECG or PO readings at the same points in time. Accuracy, F1-score, and other statistical metrics will be produced to determine the HRD's feasibility in providing reliable HR.

RESULTS

The study is ongoing. The projected end date for data collection is around July 2024.

CONCLUSIONS

The study will compare the novel patent-pending 3D-printed dry electrode-based HRD's real-time HR estimation techniques with the state-of-the-art clinical-grade ECG or PO monitors for HR accuracy and examines how fast the HRD provides reliable HR. The study will further provide recommendations and important improvements that can be made to implement the HRD for clinical applications, especially in neonatal resuscitation efforts. This work can be seen as a stepping stone in the development of robust dry-electrode single-lead ECG devices for HR estimations in the pediatric population.

INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID)

DERR1-10.2196/45512.

Simulation-Based Neonatal Resuscitation Education for Undergraduate Anesthesia Students: A Pre- and Post-Evaluation of Knowledge and Clinical Skills

Background. Nearly one in five hundred babies unexpectedly need resuscitation at birth, and the need for resuscitation is often unpredictable. A large majority of these deaths occur in low-resource settings and are preventable. Appropriate resuscitation techniques are crucial to the survival of newborn infants. Therefore, producing skilled health professionals in teaching institutions is mandatory to perform this activity. Objective. The study aimed a pre- and post-evaluation of knowledge and clinical skills performance of anesthesia students completing simulation-based neonatal resuscitation training at a Teaching Referral Hospital. Methods. A pre-post-intervention study was conducted on undergraduate final-year anesthesia students at Comprehensive and Specialized Teaching Referral Hospital, Ethiopia. We used a validated checklist to follow the students’ performance (American Heart Association, 2005, and Ogunlesi et al., 2012). The data were collected through this checklist. The collected data were analyzed with statistical package for social sciences (SPSS) version 20. Categorical variables were analyzed with chi-square test, and a $p$ -value <0.05 was considered as statistically significant. Results. A total of 51 students participated in the study. Twenty of them were females. The pre-intervention knowledge of the respondents about aspects of evaluation for neonatal resuscitation was 90.2%, and post-intervention was 94.1%; the knowledge of the respondents about aspects of appropriate actions at pre- and post-interventions was 73.4% and 83.1%, respectively. Conclusions and recommendations: This study showed that there was improvement of post-interventions knowledge and clinical skills of undergraduate anesthesia students for both aspects of evaluation and appropriate actions for neonatal resuscitation. We recommend that students who attached clinical anesthesia practice should take at least simulation-based training at skill laboratories timely.

Prise en charge périnatale du nouveau-né lors d’une naissance en milieu extrahospitalier

Les accouchements inopinés extrahospitaliers représentent environ 0,3 % des accouchements en France. La prise en charge du nouveau-né en préhospitalier par une équipe Smur fait partie de l’activité courante. L’évaluation initiale du nouveau-né comprend systématiquement la mesure de sa fréquence cardiaque (FC) et respiratoire (FR), l’appréciation de son tonus ainsi que la mesure de sa température axillaire. En cas de doute ou de transition incomplète un monitoring cardiorespiratoire sera immédiatement mis en place (FC, FR, SpO2). Nous faisons ici une mise au point sur les données connues et avons adapté les pratiques, si besoin, au contexte extrahospitalier, car la majeure partie des données rapportées dans la littérature concernent les prises en charge en maternité ou en milieu hospitalier. Nous abordons les points essentiels de la prise en charge des nouveau-nés, à savoir la réanimation cardiopulmonaire, le clampage tardif du cordon ombilical, la lutte contre l’hypothermie et l’hypoglycémie; ainsi que des situations particulières comme la prématurité, la conduite à tenir en cas de liquide méconial ou de certaines malformations congénitales. Nous proposons aussi quels peuvent être : le matériel nécessaire à la prise en charge des nouveau-nés en extrahospitalier, les critères d’engagement d’un renfort pédiatrique à la régulation ainsi que les méthodes de ventilation et d’abord vasculaire que l’urgentiste doit maîtriser. L’objectif de cette mise au point est de proposer des prises en charge les plus adaptées au contexte préhospitalier.

Perceptions and experiences of Congolese midwives implementing a low-cost battery-operated heart rate meter during newborn resuscitation

BACKGROUND

900,000 newborns die from respiratory depression each year; nearly all of these deaths occur in low- and middle-income countries. Deaths from respiratory depression are reduced by evidence-based resuscitation. Electronic heart rate monitoring provides a sensitive indicator of the neonate's status to inform resuscitation care, but is infrequently used in low-resource settings. In a recent trial in the Democratic Republic of the Congo, midwives used a low-cost, battery-operated heart rate meter (NeoBeat) to continuously monitor heart rate during resuscitations. We explored midwives' perceptions of NeoBeat including its utility and barriers and facilitators to use.

METHODS

After a 20-month intervention in which midwives from three facilities used NeoBeat during resuscitations, we surveyed midwives and conducted focus group discussions (FGDs) regarding the incorporation of NeoBeat into clinical care. FGDs were conducted in Lingala, the native language, then transcribed and translated from Lingala to French to English. We analyzed data by: (1) coding of transcripts using Nvivo, (2) comparison of codes to identify patterns in the data, and (3) grouping of codes into categories by two independent reviewers, with final categories determined by consensus.

RESULTS

Each midwife from Facility A used NeoBeat on an estimated 373 newborns, while each midwife at facilities B and C used NeoBeat an average 24 and 47 times, respectively. From FGDs with 30 midwives, we identified five main categories of perceptions and experiences regarding the use of NeoBeat: (1) Providers' initial skepticism evolved into pride and a belief that NeoBeat was essential to resuscitation care, (2) Providers viewed NeoBeat as enabling their resuscitation and increasing their capacity, (3) NeoBeat helped providers identify flaccid newborns as liveborn, leading to hope and the perception of saving of lives, (4) Challenges of use of NeoBeat included cleaning, charging, and insufficient quantity of devices, and (5) Providers desired to continue using the device and to expand its use beyond resuscitation and their own facilities.

CONCLUSION

Midwives perceived that NeoBeat enabled their resuscitation practices, including assisting them in identifying non-breathing newborns as liveborn. Increasing the quantity of devices per facility and developing systems to facilitate cleaning and charging may be critical for scale-up.

Comparison of Heart Rate Feedback from Dry-Electrode ECG, 3-Lead ECG, and Pulse Oximetry during Newborn Resuscitation

Background: Assessment of heart rate (HR) is essential during newborn resuscitation, and comparison of dry-electrode ECG technology to standard monitoring by 3-lead ECG and Pulse Oximetry (PO) is lacking. Methods: NeoBeat, ECG, and PO were applied to newborns resuscitated at birth. Resuscitations were video recorded, and HR was registered every second. Results: Device placement time from birth was median (quartiles) 6 (4, 18) seconds for NeoBeat versus 138 (97, 181) seconds for ECG and 152 (103, 216) seconds for PO. Time to first HR presentation from birth was 22 (13, 45) seconds for NeoBeat versus 171 (129, 239) seconds for ECG and 270 (185, 357) seconds for PO. Proportion of time with HR feedback from NeoBeat during resuscitation from birth was 85 (69, 93)%, from arrival at the resuscitation table 98 (85, 100)%, and during positive pressure ventilation 100 (95, 100)%. For ECG, these proportions were, 25 (0, 43)%, 28 (0, 56)%, and 33 (0, 66)% and for PO, 0 (0, 16)%, 0 (0, 16)%, and 0 (0, 18)%. All p < 0.0001. Conclusions: NeoBeat was faster to place, presented HR more rapidly, and provided feedback on HR for a larger proportion of time during ongoing resuscitation compared to 3-lead ECG and PO.

The Differences of Left Lateral and Head Elevation Position toward Heart Rate of Newborns with Asphyxia in the Perinatology Room RSUD Dr. Soediran Mangun Sumarso Wonogiri

BACKGROUND: Asphyxia delivery results in hypoxic-ischemic encephalopathy and multiorgan failure. The organ most affected by hypoxia is the cardiovascular system. Newborns with asphyxia have a lack of oxygen (hypoxia) and have an increased heart rate (tachycardia). Giving baby positions, such as supination position, pronation, right lateral, left lateral, and head elevation, are expected to improve the hemodynamic of newborns with asphyxia. AIM: This study was to determine the difference in effect between left lateral position and the head elevation position on the heart rate of newborns with asphyxia in the perinatology room of RSUD Dr. Soediran Mangun Sumarso Wonogiri. METHODS: This research is a quasi-experimental quantitative study with a pre- and post-test non-equivalent control group design. Sampling using non-probability sampling technique with consecutive sampling. The sample was divided into two groups, namely, the intervention group with 30 respondents who got the left lateral position and the control group with 30 respondents who got the head elevation position. Data analysis was performed using the Statistical Package for the Social Sciences parametric test with paired t-test and independent t-test. RESULTS: The results of paired t-test analysis in the intervention group obtained p = 0.003 (p < 0.05) and in the control group obtained p < 0.001 (p < 0.05), which means that both have a significantly on changes in the heart rate of newborns with asphyxia. The results of the independent t-test analysis obtained p = 0.191 (p < 0.05), which means that there is no significant difference in the heart rate of newborns with asphyxia in the intervention and control groups. CONCLUSION: Both interventions, giving the left lateral position and the head elevation position, have a significantly effect on changes in the heart rate of newborns with asphyxia.

A critical review of the 2020 International Liaison Committee on Resuscitation treatment recommendations for resuscitating the newly born infant

The 2020 recommendations from the International Liaison Committee on Resuscitation are an improved version of the 2015 version. The algorithm and 15 procedures are unchanged from 2015, but there are six procedures with new or changed recommendations. One new recommendation is briefing/debriefing following neonatal resuscitation. Procedures with changed suggestions/recommendations are as follows: suctioning of non-vigorous infants delivered through meconium-stained amniotic fluid, sustained inflation of preterm infants, optimising epinephrine (adrenaline), vascular access and discontinuing resuscitative efforts. CONCLUSION: In this review, we summarise the present recommendations and offer additional comments and views regarding heart rate detection, cord clamping, oxygenation and thermal control.

Neonatal resuscitation practices in Uganda: a video observational study

BACKGROUND

Neonatal mortality, often due to birth asphyxia, remains stubbornly high in sub-Saharan Africa. Guidelines for neonatal resuscitation, where achieving adequate positive pressure ventilation (PPV) is key, have been implemented in low-resource settings. However, the actual clinical practices of neonatal resuscitation have rarely been examined in these settings. The primary aim of this prospective observational study was to detail the cumulative proportion of time with ventilation during the first minute on the resuscitation table of neonates needing PPV at the Mulago National Referral Hospital in Kampala, Uganda.

METHODS

From November 2015 to January 2016, resuscitations of non-breathing neonates by birth attendants were video-recorded using motion sensor cameras. The resuscitation practices were analysed using the application NeoTapAS and compared between those taking place in the labour ward and those in theatre through Fisher's exact test and Wilcoxon rank-sum test.

RESULTS

From 141 recorded resuscitations, 99 were included for analysis. The time to initiation of PPV was 66 (42-102) s overall, and there was minimal PPV during the first minute in both groups with 0 (0-10) s and 0 (0-12) s of PPV, respectively. After initiating PPV the overall duration of interruptions during the first minute was 28 (18-37) s. Majority of interruptions were caused by stimulation (28%), unknown reasons (25%) and suction (22%).

CONCLUSIONS

Our findings show a low adherence to standard resuscitation practices in 2015-2016. This emphasises the need for continuous educational efforts and investments in staff and adequate resources to increase the quality of clinical neonatal resuscitation practices in low-resource settings.