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Biomedical subjects

P C Voukydis

Publications and source records attributed to P C Voukydis.

At least 19 recordsLinked to original sources
PubMed1975

Determination of the locus of the heart vector from body surface measurements: model experiments.

Based on the Gabor-Nelson equations a technique is described for measuring the location of the resultant heart dipole (locus-cardiogram). The technique uses three rows of eight electrodes, a head and a foot lead. Experiments with a male and a female human torso model showed good agreement between actual andmeasured dipole locations. The presence of intrathoracic electricla inhomogeneities shifts theapparetn locus of the dipole toward the highly conductive mass. The conductivity of the volume conductor and the dipole monent value do not introduce any error into the computed locus of the dipole. It is concluded that the technique is accurate and simple enough to be used for experimental and clinical observation.

Body Surface Area↗
PubMed1975

Unmasking of slow intrinsic ventricular excitation by magnetic inhibition of R-wave inhibited demand pacemakers.

In patients with permanent pacemakers and slow intrinsic ventricular excitation, the pacemaker rhythm dominates ventricular excitation. Diagnostic considerations may require that the electrocardiographic morphology of the intrinsic beats be known, such as during the exclusion of the myocardial infarction. If the pacemaker is a Cordis R wave inhibited (Stanicor) type, it is possible to allow the intrinsic rhythm to emerge by external magnetic inhibition of the pacemaker. Such inhibition can be achieved by rotating a magnet back and forth through a 180 degree arc with the magnetized poles on the surface of the chest wall above the pacing unit. Successful pacemaker inhibition by the magnet will abolish the pacemaker rhythm. It is concluded that magnetic inhibition of R wave inhibited pacemakers may be a useful diagnostic tool in patients with Stanicor pacemaker rhythms.

Arrhythmia, Sinus↗