Behandlung der neonatalen Asphyxie unter besonderer Berücksichtigung der therapeutischen Hypothermie

Therapeutic hypothermia for encephalopathic newborns with congenital heart defect: A cross-sectional survey on current practices and opinions in Germany

BACKGROUND

Therapeutic hypothermia (TH) reduces neonatal mortality and long-term neurodevelopmental impairment in infants with moderate-to-severe hypoxic-ischemic encephalopathy (HIE) caused by perinatal asphyxia. There is an increasing trend to apply TH in other indications and populations, such as infants with mild HIE or neonates with congenital heart defects (CHD), even though there is little evidence to support or refute this.

OBJECTIVE

The aim of this survey was to analyze practice variations with respect to TH use in neonates with CHD and to assess expert opinions on this topic across tertiary neonatal departments in Germany.

METHODS/DESIGN

A web-based survey was sent to all tertiary neonatal departments in Germany. The questionnaire contained 32 multiple-choice questions. The survey inquired current practices on TH in newborns with CHD and expert opinions on various clinical scenarios.

MAIN RESULTS

A total 80 (51.3%) neonatal departments partially completed the survey, and 69 (44.2%) respondents filled out the whole questionnaire. All 80 (100.0%) departments perform TH. TH is offered by 76 (95.0%) respondents to encephalopathic newborns with simple CHD. In infants with critical/complex CHD, TH is offered after perinatal asphyxial HIE and in newborns with encephalopathy after severe acidosis associated with cardiac complications by 25 (31.3%), or 17 (22.1%) respondents, respectively, whereas a clear majority of centers reject TH in these infants. Unclear effects of TH on any ongoing prostaglandin therapy (57.6 and 52.3%, respectively), an increased risk for adverse reactions during TH (51.6 and 52.3%, respectively) and lack of evidence (33.3 and 53.8%, respectively) are the most frequently cited reasons for not performing TH in these infants. The majority of experts from neonatal departments providing comprehensive care for neonates with severe CHD support the initiation of TH in encephalopathic neonates.

DISCUSSION

The considerable heterogeneity in the use of TH in neonates with CHD emphasizes the need for further research to optimize treatment strategies for these patients.

Fluid Supply and Feeding Practices in Cooled Asphyxiated Newborns

Therapeutic hypothermia (TH) for 72 h is the standard treatment to reduce neurological deficits in term newborns with hypoxic-ischemic encephalopathy. There is a large variability regarding nutritional supply during TH treatment in asphyxiated newborns. We performed a retrospective multicentre study in four level I (highest level of care in Germany) NICUs, including 135 asphyxiated term newborns undergoing TH. We analyzed enteral and parenteral nutritional supply during and after TH. We correlated nutritional supply with risk factors for encephalopathy, pH, Sarnat score, mechanical ventilation, seizures, and sedation. A total of 120 of 135 neonates received enteral nutritional supply within the first 24 h, and the majority of children were fully enterally fed within the first 10 days. The grade of encephalopathy and mechanical ventilation had a significant influence on the amount of enteral fluids (p = 0.01), whereas the pH and appearance of seizures did not affect the amount of nutritional supply significantly. Furthermore, we did not observe any correlation between enteral intake and abdominal complications such as necrotizing enterocolitis. We observed a large variability of feeding regimes in the four participating NICUs. Early enteral feeding among newborns undergoing TH was performed in each NICU and was well tolerated without increased rates of complications.

[... because We Should not Forget! Neonatal Organ Donation]

Obwohl sich fast 40% aller Todesfälle im Kindes- und Jugendalter während der Neugeborenenperiode ereignen, kommt es in der Neonatologie nur selten zur Organspende. Wir berichten über ein Neugeborenes, bei dem nach perinataler Asphyxie der endgültige, nicht behebbare Ausfall der Gesamtfunktion des Großhirns, des Kleinhirns und des Hirnstamms ("Hirntod") gemäß Transplantationsgesetz diagnostiziert wurde. Das Herz wurde nach der sogenannten zweiten richtliniengemäßen "Hirntoddiagnostik" zur Organspende entnommen und erfolgreich transplantiert. Besondere juristische Herausforderungen ergaben sich aus dem Umstand der anonymen Geburt, den notwendigen Regelungen der Vormundschaft sowie der Zuordnung des Totenfürsorgerechts. Medizinisch standen die speziellen Regelungen der Diagnostik des irreversiblen Hirnfunktionsausfalls bei Neugeborenen und der optimale Erhalt der Organfunktion vor Entnahme im Vordergrund. Für die Pflegenden stellte sich der Ablauf grundlegend anders dar als bei einer Therapiezieländerung mit anschließender palliativen Versorgung in Anwesenheit der Eltern. Angesichts der großen emotionalen Herausforderungen erwiesen sich die Einbindung aller Beteiligten in die Entscheidungsabläufe und die Übernahme der besonderen Verantwortung als hilfreich.Although almost 40% of all deaths prior to 18 years of age occur within the neonatal period, organ donation is rare in neonatology. Herein we report about a newborn infant with perinatal asphyxia and permanent, irreversible loss of brain function (cerebrum, cerebellum and brain stem), managed according to the criteria and instructions defined by the German law of donor organ transplantation. After confirmation of irreversible loss of brain function, the heart was successfully transplanted. Specific legal challenges resulted from the instance of an anonymous birth, the guardianship required, and the specific regulations of welfare of the deceased individual. The most prominent medical challenges consisted in the specific regulatory purposes for the diagnosis of the irreversible loss of brain function in neonates and the optimal maintenance of organ functions prior to donation. From the nursing point of view, the proceeding differed entirely compared to redirection of care into palliation while parents are present. Involving all stakeholders in every step of decision making was regarded as emotionally helpful.

Long-Term Outcome after Asphyxia and Therapeutic Hypothermia in Late Preterm Infants: A Pilot Study

Therapeutic hypothermia (THT) is the recommended treatment for neuroprotection in (near) term newborns that experience perinatal asphyxia with hypoxic-ischemic encephalopathy. The benefit of THT in preterm newborns is unknown. This pilot study aims to investigate long-term outcomes of late preterm asphyctic infants with and without THT compared to term infants. The single-center, retrospective analysis examined medical charts of infants with perinatal asphyxia born between 2008 and 2015. Long-term outcome was assessed using the Bayley Scales of Infant Development 2 at the age of (corrected) 24 months. Term (n = 31) and preterm (n = 8) infants with THT showed no differences regarding their long-term outcomes of psychomotor development (Psychomotor Developmental Index 101 ± 16 vs. 105 ± 11, p = 0.570), whereas preterm infants had a better mental outcome (Mental Developmental Index 105 ± 13 vs. 93 ± 18, p = 0.048). Preterm infants with and without (n = 69) THT showed a similar mental and psychomotor development (Mental Developmental Index 105 ± 13 vs. 96 ± 20, p = 0.527; Psychomotor Developmental Index 105 ± 11 vs. 105 ± 15, p = 0.927). The study highlights the importance of studying THT in asphyctic preterm infants. However, this study shows limitations and should not be used as a basis for decision-making in the clinical context. Results of a multicenter trial of THT for preterm infants (ID No.: CN-01540535) have to be awaited.