TITLE

Transmural Versus Nontransmural Myocardial Infarction

AUTHOR(S)
Ahmed, S. Sultan; Brancato, Russell R.
PUB. DATE
April 1979
SOURCE
Angiology;Apr1979, Vol. 30 Issue 4, p240
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The volume-overload heart often oserved in endurance athletes may simulate a diseased heart. We used a battery of noninvasive graphic techniques-the echocardiogram, apexcardiogram, carotid pulse, electrocardiogram, vectorcardiogram, phonocardiogram, systolic time intervals, and treadmill stress testing- in 12 professional marathon runners. Twenty nonathletes matched for age, height, sex, and weight served as a control group. Left ventricular (LV) end-diastolic dimension in marathon runners averaged 5.53 � 0.5 cm compared to 4.81 � 0.04 in nonathletes (P < 0.001). LV enddiastolic volume was 172.69 � 43.3 ml compared to 113.57 � 30.41 in nonathletes (P < 0.001). Stroke volume was 122.27 � 32.8 compared to 78.42 � 20.44 in nonathletes (P < 0.001). The thickness of the posterior LV wall was 1.0 � 0.2 compared to 0.7 �0.1 in nonathletes (P < 0.001). LV mass (g) was significantly increased. 212.43 � 55.8, compared to 123.48 � 24.54 in nonathletes (P < 0.01). The left atrium and aortic root were also relatively larger in athletes (P < 0.01). The right ventricular end-diastolic dimension was enlarged in marathon runners (2.02 � 0.65). No statistically significant differences were noted in ejection fraction, percentage of internal diameter shortening (%AD), or PEP/LVFT. The carotid tracing revealed a bisferious pulse in 5 marathon runners. The apexcardiogram showed a bifid systolic thrust in 3 and absence of abnormal A wave. That these abnormalities were related to the overload type of heart was proved by echocardiography. Farly repolarization syndrome (abnormal RS-T segment elevation) and notched T waves in FCG had as a counterpart a semilunar configuration in VCG. Three athletes met ECG criteria and 1 met VCG criteria of LVH. The treadmill exercise ECG was negative in all 12 athletes. Biventricular enlargement and increased left ventricular mass are found in the marathon runner's heart. However, myocardial contractility at rest is not statistically different from contractility in nonatheletes.
ACCESSION #
16390717

 

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