The laser displacement technique is a new method to registrate low-frequency precordial movements. In 16 young healthy men, the apexcardiogram was obtained subsequently by the conventional and by the laser displacement technique. Basic differences in time intervals and amplitude relations were analysed with the paired t test. In the laser apexcardiogram, the peak of systolic upstroke came later (21 ± 19 ms, p < 0.001), the proportion of the amplitude of systolic upstroke to total deflection was smaller (12.2 ± 15.4%, p < 0.01). and the upstroke elicited by atrial contraction was proportionally larger (3.8 ± 6.3%, p < 0.05) than in the conventional apexcardiogram. Timing of the onset of the systolic upstroke and of the protodiastolic nadir were similar in both apexcardiograms. The observed differences are the consequence of the different physical basis of the two methods. The laser apexcardiogram seems to be more sensitive to the diastolic events since its diastolic amplitudes are proportionally larger.

Keywords:
Laser, Apexcardiography
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1991
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