競艇選手の前胸壁陥凹に伴う機能的心雑音について

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Two-hundred professional motorboat race men have undergone physical examination. Simultaneously, ECG and PCG have been examined. Their characteristic features of stature were depressed sternum, roud back and some deformities of big joints resulted from long termed enforced peculiar posture and extreme vibration of motorboat. The sternal depressions were measured by special rule, and the estimations were 8.3 mm in average. In same aged medical students, these depressions were 3.0mm in average. The depression degree of the sternum seems to be increased with the term of the professional life. Another outstanding feature of the physical examination was the grade 2-3 systolic heart murmurs. These murmurs were audible in 78 per cent of them. In control group, this ratio decreased in 43 per cent. Maximum points of the murmurs were existed along the left sternal border in 96 per cent. These murmurs should be included in functional murmur. It is well known that the functional murmur occupies less than two third of the systolic phase usually. This expression was reformed as follow; SM duration/Q-A time α/3. In this series, α was less than 2 in all of them. On the contrary, in 50 cardiac diseases with systolic murmurs in our clinic, the "α" exceeded 2. But not always, this ratio may provide the functional murmur. Even in another conditions, the murmurs of this series should be included in the category of the innocent murmur. All of ECG but one which showed ventricular beat presented normal sinus rhythm. Peculiar findings of ECG were M or W type of QRS complex in V_1 and V_2 (34 per cent) but incomplete right bundle branch block have existed in only 6 cases (5.7 per cent). These M or W typed QRS complex were seen in 86 per cent of the group whose professional careers have exceeded over 6 years. No relation was found between the ECG findings and heart murmur. This series having functional murmurs in high rate will be interested object for further studies of innocent murmur.
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競艇選手の前胸壁陥凹に伴う機能的心雑音について

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