Peculiarities of melatonin levels in preterm infants

BACKGROUND

Melatonin plays an important role in organism functioning, child growth, and development. Of particular importance is melatonin for preterm infants. The aim of our research was to study the peculiarities of melatonin levels depending on various factors in preterm infants with gestational age (GA) of less than 34 weeks.

METHODS

The study involved 104 preterm infants with GA less than 34 weeks who were treated in the neonatal intensive care unit (NICU). The level of melatonin in urine samples was determined by an enzyme-linked immunosorbent assay.

RESULTS

Melatonin concentration was significantly lower in extremely and very preterm infants compared to moderate preterm (3.57 [2.10; 5.06] ng/ml vs. 4.96 [3.20; 8.42] ng/ml, p = 0.007) and was positively correlated with GA (Spearman r = 0.32; p < 0.001). Positive correlations were revealed between melatonin levels and Apgar scores at the 1st (Spearman r = 0.31; p = 0.001) and 5th minutes after birth (Spearman r = 0.35; p < 0.001). Melatonin levels were lower in newborns with respiratory distress syndrome (p = 0.011). No significant correlations were found between melatonin concentration and birth weight (Spearman r = 0.15; p = 0.130). There were no associations of melatonin concentrations and mode of delivery (p = 0.914), the incidence of early-onset sepsis (p = 0.370) and intraventricular hemorrhages (p = 0.501), and mechanical ventilation (p = 0.090). The results of multiple regression showed that gestational age at birth was the most significant predictor of melatonin level in preterm infants (B = 0.507; p = 0.001).

CONCLUSION

Gestational age and the Apgar score were associated with decreased melatonin levels in preterm infants. The level of melatonin in extremely and very preterm infants was lower compared to moderate preterm infants.

The relationship of melatonin concentration in preterm infants and adverse outcomes in the late neonatal period

Introduction

The aim of research was to assess the melatonin concentrations in the early neonatal period as a predictor of adverse outcomes of late neonatal period in preterm infants and to estimate its optimal predictive cut-off values.

Materials and methods

A total of 115 preterm infants admitted to the neonatal intensive care unit were screened for eligibility, five did not meet the criteria, six parents declined the participation. So, a total of 104 preterm infants with gestational age 25-34 weeks were included in research. The concentration of melatonin in urine was determined by the Enzyme Immunoassay method (Human Melatonin Sulfate ELISA kit, Elabscience, China). The Mann-Whitney U-test and analysis of the receiver operating characteristic (ROC) curve were used in statistical analysis.

Results

Analysis of the ROC curves has revealed optimal cut-off values for urinary melatonin concentration to predict late outcomes. Melatonin concentration below 3.58 ng/ml with sensitivity of 72% can predict development of retinopathy of prematurity (ROP) (AUC = 0.73; 95% confidence intervals (CI) 0.61-0.86). Good diagnostic accuracy (AUC = 0.80; 95% CI 0.67-0.93) has been shown for bronchopulmonary dysplasia (BPD). The optimal cut-off value for melatonin concentration in BPD prediction is 3.71 ng/ml (sensitivity 80%, specificity 64%). Urinary melatonin concentration below 3.79 ng/ml can be associated with late-onset sepsis (AUC = 0.76; 95% CI 0.64-0.87; sensitivity 72%; specificity 62%). There were no significant associations between melatonin concentration and necrotizing enterocolitis (P = 0.912).

Conclusion

Urinary melatonin concentration below the certain cut-off values in the early neonatal period may serve as one of the predictors of adverse outcomes such as BPD, ROP, and late-onset sepsis in the late neonatal period in preterm infants.

Skin-to-skin contact-An effective intervention on pain and stress reduction in preterm infants

Introduction

The outcomes of pain and stress in preterm infants in the neonatal intensive care units (NICUs) compel the continued search for pain- and stress-reducing interventions.

The objective of the study

To investigate how skin-to-skin contact (SSC) influences chronic pain and stress in preterm infants in the NICU.

Materials and methods

The study included 140 preterm infants in the NICU with gestational age less than 34 weeks. The overall design was a baseline-response design. Urine and saliva were collected before (baseline) and after SSC to measure pain and stress markers by enzyme immunoassay method. The behavioral indicators of chronic pain were assessed using the EDIN (Échelle Douleur Inconfort Nouveau-Né-neonatal pain and discomfort).

Results

There was a significant decrease in the dopamine level in preterm infants after SSC in comparison with baseline values (85.99 [69.35; 112.20] pg/ml vs. 132.20 [104.80; 183.70] pg/ml), p < 0.001. The β-endorphin and serotonin levels increased after SSC (40.09 [26.81; 70.63] pg/ml vs. 29.87 [20.61; 46.94] pg/ml, p = 0.009 and 25.49 [20.45; 40.08] ng/ml vs. 22.30 [15.13; 31.65] ng/ml, p = 0.011, respectively). A significant decrease in cortisol levels in saliva and urine after SSC in comparison with baseline values (0.125 [0.079; 0.225] μg/dl vs. 0.371 [0.188; 1.002] μg/dl, p = 0.000 and 27.06 [14.59; 35.35] ng/ml vs. 35.25 [19.78; 61.94] ng/ml, p = 0.001, with a simultaneous increase of oxytocin level (57.00 [36.55; 88.49] pg/ml vs. 38.20 [28.78; 56.04] pg/ml, p = 0.009 were revealed. The total pain EDIN score in infants after SSC was below 6 points, significantly decreasing compared to the baseline (p < 0.05).

Conclusion

Preterm infants in the NICU experience stress and pain, which were confirmed by the EDIN pain scale and laboratory markers. The level of dopamine and cortisol as pain and stress hormones were reliably high, and normalized after regular SSC. Simultaneously, pain-relieving and anti-stress markers of oxytocin, β-endorphin and serotonin reliably increased in preterm infants in response to the SSC.

An international study on implementation and facilitators and barriers for parent‐infant closeness in neonatal units

Importance

Parent‐infant closeness and active parent participation in neonatal care are important for parent and infant health.

Objective

To give an overview of current neonatal settings and gain an in‐depth understanding of facilitators and barriers to parent‐infant closeness, zero‐separation, in 19 countries.

Methods

Neonatal intensive care unit (NICU) professionals, representing 45 NICUs from a range of geographic regions in Europe and Canada, were purposefully selected and interviewed June–December 2018. Thematic analysis was conducted to identify, analyze and report patterns (themes) for parent‐infant closeness across the entire series of interviews.

Results

Parent‐infant separation during infant and/or maternity care is very common (42/45 units, 93%), despite the implementation of family integrated care (FICare) practices, including parent participation in medical rounds (17/45, 38%), structured education sessions for parents (16/45, 36%) and structured training for healthcare professionals (22/45, 49%). NICU professionals encountered four main themes with facilitators and barriers for parent‐infant closeness on and between the hospital, unit, staff, and family level: Culture (jointly held characteristics, values, thinking and behaviors about parental presence and participation in the unit), Collaboration (the act of working together between and within different levels), Capacities (resources and policies), and Coaching (education to acquire and transfer knowledge and skills).

Interpretation

Implementing parent‐infant closeness in the NICU is still challenging for healthcare professionals. Further optimization in neonatal care towards zero‐separation and parent‐infant closeness can be achieved by enforcing the ‘four Cs for Closeness’: Culture, Collaboration, Capacities, and Coaching.

Maternal Stress Experience in the Neonatal Intensive Care Unit after Preterm Delivery

OBJECTIVE

 Preterm delivery with the admission of a child in the neonatal intensive care unit (NICU) is extremely challenging for parents. Being separated from the baby and seeing her infant feeling pain and being sick together with the complexity of the NICU environment, the mother experiences great anxiety, fear, and stress. The purpose of the study was to assess NICU-related stress and to identify maternal and infant factors associated with increased stress in mothers of preterm infants.

STUDY DESIGN

 The maternal stress level was assessed in 122 mothers of preterm infants using the Parental Stressor Scale: NICU (PSS: NICU) in which items were distributed in three subscales as follows: Sights and Sounds of NICU-subscale 1 (S1), Infant Appearance and Behavior-S2, and Parental Role Alteration-S3.

RESULTS

 Maternal total PSS: NICU score was 3.46 ± 0.71. Parenteral Role Alteration was the most stressful (4.20 ± 0.79) followed by Infant Appearance and Behavior (3.51 ± 0.91) and Sights and Sounds subscale (2.28 ± 0.95); p (S1-S2) < 0.001, p (S1-S3) < 0.001, and p (S2-S3) < 0.001. Total PSS: NICU and Infant Appearance and Behavior scores correlated positively with maternal age (r = 0.189; p = 0.040 and r = 0.204; p = 0.027, respectively) and duration of NICU treatment (r = 0.188; p = 0.044 and r = 0.190; p = 0.042). More visits in NICU by a mother were associated with a lower PSS: NICU score (p = 0.049) and neonatal seizures and invasive ventilation in infants were associated with higher stress scores (p = 0.007 and p = 0.042).

CONCLUSION

 Mothers of preterm infants admitted in the NICU experience significant stress which is correlated with maternal age and NICU treatment duration and is associated with frequency of NICU visits, presence of neonatal seizures, and need for ventilator support. Parental role alteration is the greatest stressor followed by Infant Appearance and Behavior and NICU-surrounding stressor factors which show the need for interventions and counseling focused on mothers' role, their involvement in infant's care, and thus, family-centered care implementation.

KEY POINTS

· Mothers of preterm infants experience significant stress.. · Parental role alteration is the greatest maternal stressor.. · Maternal stress is correlated with age and NICU duration, and is associated with the frequency of NICU visits and infant's health status.

Skin-to-skin contact to support preterm infants and reduce NICU-related stress

OBJECTIVE

Hospitalization in the neonatal intensive care unit (NICU) with numerous painful medical interventions, being separated from parents, leads to the high risk of chronic stress for preterm infants. Today, many NICUs use more appropriate developmental care and pain management, but the early and long-term outcomes of stress in these vulnerable infants require searching for more stress-reducing interventions in neonatal care. The objective of the study was to investigate how skin-to-skin contact (SSC) can influence the biologic stress levels in preterm infants in the NICU by assessing cortisol and oxytocin levels.

PARTICIPANTS AND METHODS

The study included 71 preterm infants with gestational age less than 34 + 0/7 weeks who were recruited from level III NICU. The overall design was a baseline-response design. Saliva and urine were collected before (baseline) and after skin-to-skin contact to measure salivary cortisol and urinary oxytocin by enzyme immunoassay method.

RESULTS

The infants' baseline hormonal status was represented by the following indicators: the level of salivary cortisol was 0.402 [0.227; 1,271] μg/dl, urinary oxytocin 48.88 [32.97; 88.11] pg/ml. There was a decrease in salivary cortisol levels to 0.157 [0.088; 0.351] μg/dl compared to baseline (p ˂ 0.001) with a simultaneous increase of the urinary oxytocin level -73.59 [45.18; 108.8] pg/ml (p = 0.028) in response to SSC.

CONCLUSION

Preterm infants in the NICU experience significant stress, characterized by hormonal imbalance: an increased level of the stress hormone cortisol and a decreased level of the anti-stress hormone oxytocin. Skin-to-skin contact helps to ameliorate the hormonal stress in preterm infants by activating the oxytocin release with simultaneous reduction of cortisol secretion.

Assessment and Correction of Stress in Preterm Infants and Their Mother

Objective: To investigate how skin-to-skin contact influences the stress levels in preterm infants in the neonatal intensive care unit and their mothers.

Materials and Methods: The study included 60 preterm infants with gestational age less than 32 weeks, who were treated in the neonatal intensive care unit, and their mothers. The overall design was a baseline-response design. Saliva was collected before (baseline) and after skin-to-skin contact to measure free cortisol by enzyme immunoassay method.

Results: Infant baseline salivary cortisol level was 0.587 [0.239; 1.714] μg/dL. It was significantly higher in neonates who had invasive ventilation (1.00 [0.38; 2.44]) μg/dL compared to non-ventilated infants (0.335 [0.156; 1.236]) μg/dL, P = .022 and was positively correlated with the duration of ventilation (r = 0.70; P = .0000). Maternal baseline salivary cortisol level was 0.212 [0.123; 0.378] μg/dL. There was significant decreasing of salivary cortisol after Kangaroo mother care with skin-to-skin contact in infants (0.162 [0.111; 0.231]) μg/dL, P < .001 and mothers (0.096 [0.077; 0.156]) μg/dL, P < .001.

Conclusion: Preterm infants in the neonatal intensive care unit and their mothers experience stress which can be confirmed by the increased baseline cortisol levels. Kangaroo mother care with skin-to-skin contact reduces the stress and normalizes salivary cortisol levels in both the infant in the neonatal intensive care unit and the mother.

Kangaroo mother care can improve the short-term outcomes of very preterm infants

BACKGROUND

Kangaroo mother care (KMC) is a cornerstone of preterm infant management. The purpose of this study was to estimate the effectiveness of daily prolonged KMC in very preterm infants and its influence on neonatal morbidity and short-term outcomes, and breastfeeding optimization.

METHODS

Research included 52 very preterm infants. According to the KMC duration newborns were divided into two groups; Group1 of 22 infants (42.3%) - KMC lasted more than 3 hours/day, Group 2 of 30 infants (57.7%) - KMC lasted less than 3 hours/day.

RESULTS

Nosocomial sepsis occurred less frequently in Group 1 versus Group 2 (OR = 10.50; 95% CI 1.23-89.67, p = 0.012). Incidences of BPD, NEC, IVH I-II grades, the duration of parenteral nutrition, and growth parameters have not been different between groups (p > 0.05). Breastfeeding rates at discharge prevailed in Group 1 (OR = 3.70; 95% CI 1.16-11.86, p = 0.025). The most important factors for nosocomial sepsis: combination of parenteral nutrition duration and daily prolonged KMC, as a preventing factor (p = 0.002). Combination of the neonatal intensive care unit (NICU) treatment duration, type of enteral feeding, and mother's age add as factors that have important influence on breastfeeding prolongation (p = 0.009).

CONCLUSION

Nosocomial infection prevention and breastfeeding optimization are profitable outcomes of daily prolonged KMC in very preterm infants. No significant differences in the BPD, NEC, IVH I-II grades incidences, duration of parenteral nutrition, and growth parameters were found between studied groups. Combination of long-lasting KMC and short-term parenteral nutritionis a significant factor for nosocomial sepsis prophylaxis.

Regular and prolonged skin-to-skin contact improves short-term outcomes for very preterm infants: A dose-dependent intervention

INTRODUCTION

Skin-to-skin contact (SSC) is a cornerstone of neurodevelopment and family-oriented care for preterm infants. The purpose of the present study was to investigate the effectiveness of skin-to-skin contact in preterm babies depending on regularity, duration, and the period of the first contact.

MATERIALS AND METHODS

This retrospective study involved 26 premature infants with gestational age 24/0-28/6 weeks who were treated in the neonatal intensive care unit and neonatal department. All infants had SSC with their parents.

RESULTS

According to the first SSC, newborns were divided into two groups: group 1 (SSC began in the 1st week of life) and group 2 (SSC began after the 1st week of life). Group A (SSC was performed regularly, i.e., everyday) and group B (SSC was irregular, i.r., once every 2 or 3 days) were based on the regularity of SSC. Depending on the duration of SSC, group І (SSC was more than 3h per day) and group II (SSC was less than 3h per day) were formed. Early SSC correlated with lower incidence of secondary infections (OR=6.75; 95% CI 1.06-42.84; P=0.051), bronchopulmonary dysplasia (OR=10.67; 95% CI 1.70-66.72; P<0.015), and cholestasis (P=0.022). Regular SSC correlated with lower incidence of secondary infections (OR=15.0; 95% CI 1.50-149.70; P=0.014). Duration of SSC was correlated with lower rates of secondary infections (OR=7.00; 95% CI 1.20-40.83; P=0.043) and better rates of breastfeeding (OR=7.00; 95% CI 1.20-40.83; P=0.043).

CONCLUSION

Early, regular, and prolonged SSC has a positive impact on premature infants' health. In particular, early SSC is associated with a reduced risk of BPD development, cholestasis, and nosocomial infection. Prolonged daily skin-to-skin contact is associated with a lower incidence of nosocomial infection and promotes breastfeeding.

[ABNORMALITIES OF THYROID HORMONE METABOLISM DURING COMMUNITY‒ACQUIRED PNEUMONIA: NONTHYROIDAL ILLNESS SYNDROME AND INTRACELLULAR IODINE DISTRIBUTION IN CHILDREN]

The aim of the study ‒ to investigate the changes of thyroid function and to reveal the relationship in between intracellular distribution of iodine in the blood with the severity of the course of pneumonia in children. We investigated 70 patients in age 6-14 years with moderate and severe CAP and 35 healthy children. The levels of free thyroxine (fT4), free triiodo-thyronine (fT3) and thyroid stimulating hormone, thyroid gland ultrasound and urinary iodine were estimated. Inorganic iodine, total and organificated iodine was investigated. The article presents that severe pneumonia in children is characterized by a transient low level of fT3 2,89 pmol/L (p˂0,05). In a dynamics initially low levels of fT3 raise up to normal data. The general condition and clinical symptoms of the patients was improving after treatment of pneumonia and thyroid status was normalized. Mild iodine deficiency has been established in all children. The intracellular pool of iodine with severe pneumonia showed an inverse relationship between the levels of iodine distribution for organificated and inorganic iodine and a close connection between the levels of total and organic iodine (p<0,001). Nonthyroid illness syndrome developed for patients with severe community-acquired pneumonia. The revealed changes in indices of the intracellular pool of iodine and its distribution in the body are directly proportional to the severity of CAP.