[External cardiotocography in movement. Autocorrelation technic, an initial step for external telemetric...

Ultrasonocardiograms with autocorrelation technique were registered in 60 women from 24th to 41th week of pregnancy. Registration was first done in lying position for 10 minutes, then for another 10-20 minutes in sitting position, thereafter in standing position and finally during walking around. The registration quality was good with rare gaps: median range of gaptime 1-3, 6% in the lying, 0-6% in the sitting, 0-4% in the standing and 1.8-6.4% in the walking patient. Fitting corrections of the transducer were needed nearly only when changing from lying to sitting position. In 18 parturients external ultrasonocardiography in autocorrelation technique and telemetric direct fECG-cardiography gave nearly identical registrations.