[Transient myocardial ischemia in newborn infants]

Area of Science:

• Neonatal Cardiology
• Pediatric Electrocardiography
• Cardiovascular Physiology

Background:

• Neonatal hypoxia is a significant risk factor for cardiovascular complications.
• Myocardial ischemia in newborns can present with subtle or severe clinical signs.
• Electrocardiography (ECG) is a key diagnostic tool in assessing neonatal cardiac health.

Purpose of the Study:

• To investigate the incidence and characteristics of myocardial ischemia in newborns with low Apgar scores.
• To correlate clinical findings and electrocardiographic changes with hypoxic events.
• To evaluate the prognostic value of ECG abnormalities and the effectiveness of early detection.

Main Methods:

• Randomized clinical and electrocardiographic study of 30 newborns with Apgar scores ≤5.
• Detailed clinical examination including assessment for cardiac signs like tricuspid regurgitation and heart failure.
• Systematic ECG analysis for ST-T wave abnormalities, low voltage, and pathological Q waves.

Main Results:

• Twenty-five newborns (83%) exhibited ECG changes indicative of myocardial ischemia.
• Generalized low voltage was common (21 cases), while pathological Q waves were rare (5 cases).
• Seventeen newborns presented with clinical cardiac signs; 5 infants died, with autopsy confirming subendocardial infarction.

Conclusions:

• A strong relationship exists between neonatal hypoxia and myocardial ischemia.
• Systematic ECG and clinical evaluation are justified for early detection and management of myocardial ischemia in at-risk neonates.
• Most survivors showed normalization of ECG findings within 15 days, suggesting potential for recovery with timely intervention.