2009 Southern Regional Meeting Abstracts

Purpose of Study: The purpose of this study is to evaluate the response of their T waves to the stress of exercise.
Methods Used: Inclusion criteria included a structurally normal heart and age less than or equal to 18. Data recorded included baseline ECG characteristics, demographics, peak heart rates and METS achieved, and heart rates at which T waves “normalized” during EST. All were exercised using Modified Bruce Protocol with continuous monitoring of their ECG’s. Simple statistical analysis was utilized.
Summary of Results: We identified 13 patients with structurally normal hearts that were referred due to T wave inversion on a resting ECG (8males and 5 females). Of race were Caucasian (6), African American (6), and Hispanic (1). Ages ranged from 8 to 18 with a mean of 14 and a median of 15.5. Eleven of thirteen (85%) of patients experienced complete T wave reversion with two of thirteen (15%) experienced partial (3/6 limb leads) reversion during EST. Mean peak heart rate was 192 beats per minute (bpm) (range 169-214) and mean maximum METS achieved was 13.2 (range 9-18.5). The average heart rate at which T wave reversion was met was 152 bpm (range 113-187) and a median of 153. The mean METS that T waves were reverted was achieved at 5.2 (range 1 .0-12.3) and a median of 4.5.
Conclusions: Exercise Stress Testing pediatric patients with functionally and structurally normal hearts with T wave inversion on resting ECG resulted in complete or partial (100
%) reversion of their T waves. This phenomenon occurs at an average heart rate of 152 bpm. It occurs in all sexes and ethnicities encountered. A large multi-centered study would remedy to improve the power of this study.

Results

Mean maximal rate	192 bpm
Range	169-214
Mean rate at T wave change	152 bpm
Range	113-187
Mean METs	13.2
Range	9-18.5
Mean METs at T wave change	5.2
Range	1 .0-12.3