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Ischemic papillary muscle necrosis in stressed newborn infants
Insights
Ischemic myocardial necrosis (IMN) is common in stressed newborns who die early. This condition, often affecting papillary muscles, correlates with birth asphyxia and heart failure signs.
Area of Science:
- Cardiovascular Pathology
- Neonatal Medicine
- Pediatric Cardiology
Background:
- Transient tricuspid insufficiency in newborns is linked to ischemic papillary muscle necrosis.
- A retrospective analysis was conducted on autopsied infants who died within seven days of birth.
Purpose of the Study:
- To investigate the incidence and characteristics of ischemic myocardial necrosis (IMN) in early neonatal deaths.
- To identify clinical factors associated with IMN in this vulnerable population.
Main Methods:
- Retrospective clinical and histological analysis of 82 autopsied infants (1973-1977).
- Exclusion of infants with congenital heart disease, erythroblastosis fetalis, and congenital viral infections.
- Detailed examination of myocardial tissue for ischemic necrosis, particularly in papillary muscles.
Main Results:
- 31 out of 82 infants (37.8%) exhibited ischemic myocardial necrosis.
- The apical region of an anterior papillary muscle was the most frequent site of IMN.
- IMN incidence increased with infant age and size; asphyxia, AV valve insufficiency murmurs, and congestive heart failure correlated with IMN.
Conclusions:
- Ischemic myocardial necrosis is a frequent finding in stressed infants experiencing early mortality.
- Episodic myocardial hypoperfusion is a likely cause of IMN in neonates.
- Clinical signs like birth asphyxia and heart failure are important indicators of potential IMN.
Abstract:
The recent association of transient tricuspid insufficiency in newborn infants with ischemic papillary muscle necrosis prompted a detailed retrospective clinical and histologic analysis of autopsied infants who died within seven days of birth between 1973 and 1977. Infants with congenital heart disease, erythroblastosis fetalis, and known congenital viral infections were excluded. Thirty-one of 82 infants had at least one site of ischemic myocardial necrosis: 11 had lesions only in the right ventricle, 13 had lesions only in the left ventricle, and seven had bilateral lesions. The apical region of an anterior papillary muscle was the most common site. IMN occurred more commonly in older, larger infants. Asphyxia at birth, a murmur of atrioventricular valve insufficiency, and signs of congestive heart failure correlated well with the presence of IMN, but few other perinatal events predicted its occurrence. This report suggests that IMN is a common event in stressed infants who die early in life and probably is related to episodic hypoperfusion of the myocardium.