Serial electrocardiographic changes in healthy and stressed neonates

Area of Science:

• Neonatal cardiology
• Pediatric electrocardiography
• Myocardial ischemia assessment

Background:

• The electrocardiogram (ECG) is crucial for assessing neonatal cardiac health.
• T-wave characteristics on ECG can indicate myocardial function and stress.
• Understanding normal T-wave evolution in neonates is essential for identifying pathology.

Purpose of the Study:

• To analyze serial changes in T-wave vector and polarity in healthy and stressed neonates.
• To identify potential ECG markers for neonatal myocardial ischemia.
• To determine the reliability of T-wave alterations as indicators of ischemia over time.

Main Methods:

• Collected 162 electrocardiograms from 44 healthy and 17 stressed term neonates.
• Recorded ECGs at three time points: 5-8 hours, 24-33 hours, and 71-96 hours post-birth.
• Assessed sequential changes in T-wave amplitude, frontal, and horizontal axes.

Main Results:

• Both healthy and stressed neonates showed sequential changes in T-wave amplitude and axes.
• Stressed neonates exhibited a lag in T-wave amplitude normalization, with prolonged T-wave flattening.
• A similar lag was observed in the stressed group regarding normal T-wave axis progression.

Conclusions:

• Alterations in T-wave amplitude and axis in neonates may indicate myocardial ischemia.
• These T-wave changes are reliable indicators of neonatal myocardial ischemia only after the initial 24 hours of life.
• Serial ECG monitoring is valuable for detecting subtle cardiac changes in stressed newborns.