Trajectories of parasympathetic nervous system function before, during, and after feeding in infants with transposition of the great arteries

Biobehavioral Efficacy of the Elevated Side-Lying Position for Feeding Preterm Infants: Study Protocol

AIM

Present a study protocol investigating the biobehavioral efficacy of side-lying vs. supine positions on physiologic and behavioural responses of preterm infants during their transition from tube to full oral feeding, and identify associated infant characteristics.

DESIGN

Within-subject cross-over design.

METHODS

Sixty preterm infants born at ≤35 weeks gestational age (GA) from a level 3 NICU are observed during their transition to full oral feeding. Each undergoes two feedings within 24 h: One in the supine position and one in the side-lying position. Continuous physiologic and video data are collected 30 min before and after feeding. Physiologic measures include heart rate, respiratory rate, oxygen saturation, and autonomic nervous system regulation (heart rate variability and splanchnic-cerebral oxygen ratio). Behavioural responses are assessed via microanalysis of the sucking and breathing waveforms and videotaped feedings (Suck-breathe coordination and Early Feeding Skills assessment tool). Data are analysed using linear mixed-effects models. IRB was obtained in September 2021, with funding awarded by the National Institute of Nursing Research in July 2021.

CONCLUSION

This study will enhance our understanding of the effects of the side-lying position on preterm infant feeding, providing guidance for its clinical use as a feeding strategy.

IMPLICATIONS

Provides vital knowledge to guide evidence-based practices in enhancing oral feeding in preterm infants and inform future pivotal efficacy trials.

IMPACT

If effective, this intervention could significantly enhance the management of feeding challenges in preterm infants across neonatal care settings.

REPORTING METHOD

Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) 2013.

PATIENT OR PUBLIC CONTRIBUTION

While direct parent involvement was not documented in our protocol, informal feedback on data collection procedures from parents was incorporated. Additionally, extensive engagement with healthcare professionals during study design addressed patient safety, logistical challenges, and ethical standards in NICU settings.

TRIAL REGISTRATION

ClinicalTrials.gov identifier: NCT04942106; registered on 28 June 2021. Available at: https://clinicaltrials.gov/ct2/show/NCT04942106.

Oral feeding dysfunction in post-operative infants with CHDs: a scoping review

Post-operative oral feeding difficulties in neonates and infants with CHD is common. While pre-operative oral feeding may be normal, oral feeding challenges manifest in the post-operative period without a clearly defined aetiology. The objective of this scoping review was to examine post-operative oral feeding in full-term neonates and infants with a CHD. Electronic databases query (1 January 1975-31 May 2021), hand-search of the reference lists of included studies, contact with experts, and review of relevant conferences were performed to identify quantitative studies evaluating post-operative oral feeding in full-term neonates and infants with a CHD. Associations with additional quantitative variables in these studies were also examined. Twenty-five studies met inclusion criteria. Eighty per cent were cohort studies that utilised retrospective chart review from a single institution. The primary variable of interest in all studies was oral feeding status upon discharge from neonatal hospitalisation. The most common risk factors evaluated with poor feeding at time of discharge were birth weight (36% of included studies), gestational age (44%), duration of post-operative intubation (48%), cardiac diagnosis (40%), and presence of genetic syndrome or chromosomal anomaly (36%). The most common health-related outcomes evaluated were length of hospital stay (40%) and length of ICU stay (16%). Only the health-related outcomes of length of hospital stay and length of ICU stay were consistently significantly associated with poor post-operative oral feeding across studies in this review. A clear aetiology of poor post-operative oral feeding remains unknown.

Neonatal heart rate variability: a contemporary scoping review of analysis methods and clinical applications

BACKGROUND

Neonatal heart rate variability (HRV) is widely used as a research tool. However, HRV calculation methods are highly variable making it difficult for comparisons between studies.

OBJECTIVES

To describe the different types of investigations where neonatal HRV was used, study characteristics, and types of analyses performed.

ELIGIBILITY CRITERIA

Human neonates ≤1 month of corrected age.

SOURCES OF EVIDENCE

A protocol and search strategy of the literature was developed in collaboration with the McGill University Health Center's librarians and articles were obtained from searches in the Biosis, Cochrane, Embase, Medline and Web of Science databases published between 1 January 2000 and 1 July 2020.

CHARTING METHODS

A single reviewer screened for eligibility and data were extracted from the included articles. Information collected included the study characteristics and population, type of HRV analysis used (time domain, frequency domain, non-linear, heart rate characteristics (HRC) parameters) and clinical applications (physiological and pathological conditions, responses to various stimuli and outcome prediction).

RESULTS

Of the 286 articles included, 171 (60%) were small single centre studies (sample size <50) performed on term infants (n=136). There were 138 different types of investigations reported: physiological investigations (n=162), responses to various stimuli (n=136), pathological conditions (n=109) and outcome predictor (n=30). Frequency domain analyses were used in 210 articles (73%), followed by time domain (n=139), non-linear methods (n=74) or HRC analyses (n=25). Additionally, over 60 different measures of HRV were reported; in the frequency domain analyses alone there were 29 different ranges used for the low frequency band and 46 for the high frequency band.

CONCLUSIONS

Neonatal HRV has been used in diverse types of investigations with significant lack of consistency in analysis methods applied. Specific guidelines for HRV analyses in neonates are needed to allow for comparisons between studies.

Daily and Weekly Rehabilitation Delivery for Young Children With Gross Motor Delay: A Randomized Clinical Trial Protocol (the DRIVE Study)

PURPOSE

The proposed project tests the principle that frequency of rehabilitation is an important regulator of therapeutic response in infants.

METHODS

We will randomize 75 infants with cerebral palsy, 6 to 24 months of age and/or Gross Motor Function Classification System levels III to V (higher severity), to determine the short-term and long-term effects of 3 dosing protocols consisting of an identical number of 2-hour sessions of the same motor learning-based therapy applied over a different total number of calendar weeks.

RESULTS AND CONCLUSIONS

The results will inform clinicians, families, and scientists about dosing and will provide needed recommendations for frequency of rehabilitation to optimize motor function and development of young children with cerebral palsy.

Heart Rate Variability as a Feeding Intervention Outcome Measure in the Preterm Infant

BACKGROUND

Feeding interventions for preterm infants aim to reduce the physiologic stress of feeding to promote growth. Heart rate variability (HRV) is a potential noninvasive measure of physiologic stress that may be useful for evaluating efficacy of feeding interventions.

PURPOSE

To evaluate whether HRV is a sensitive measure of physiologic stress compared with standard physiologic outcomes in the context of a feeding intervention study.

METHODS

This was a secondary analysis of a within-subjects, cross-over design study comparing usual care feeding with a gentle, coregulated (CoReg) feeding approach in 14 infants born less than 35 weeks' postmenstrual age. HRV indices were calculated from electrocardiogram data and compared with standard physiologic outcomes, including oxygen saturation (Spo2), respiratory rate (RR), apnea, heart rate (HR), and bradycardia. Data were analyzed using linear mixed modeling.

RESULTS

Infants fed using the CoReg approach had fewer apneic events and higher RR, suggesting they were able to breathe more during feeding. No statistically significant differences were found in SpO2, HR, bradycardia, or high frequency power (the most commonly reported measure of HRV). Infants fed using the usual care approach had significantly higher SD12, a measure of HRV indicating randomness in the HR, which is a potential indicator of elevated stress.

IMPLICATIONS FOR PRACTICE

SD12 was more sensitive to stress than SpO2, HR, and bradycardia. The utility of HRV as a measure of feeding outcomes in clinical practice needs further exploration.

IMPLICATIONS FOR RESEARCH

Further exploration of HRV as an intervention outcome measure is needed, particularly evaluating nonlinear indices, such as SD12.