| Wenckebach, Karel | <person> Dutch internist, 1864-1940. See: Wenckebach block, Wenckebach period, Wenckebach phenomenon. (05 Mar 2000) |
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| Pelger, Karel | <person> Dutch physician, 1885-1931. See: Pelger-Huet nuclear anomaly. (05 Mar 2000) |
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| Trunecek, Karel | <person> Czechoslovakian physician, *1865. See: Trunecek's sign. (05 Mar 2000) |
| Wenckebach block | A form of block in any cardiac tissue (most often the atrioventricular junction) in which there is progressive lengthening of conduction until the beat is dropped. (05 Mar 2000) |
| Wenckebach period | A sequence of cardiac cycles in the electrocardiogram ending in a dropped beat due to A-V block, the preceding cycles showing progressively lengthening P-R intervals; the P-R interval following the dropped beat is again shortened. (05 Mar 2000) |
| Wenckebach phenomenon | Progressive lengthening of conduction time in any cardiac tissue (most often the A-V node or junction) with ultimate dropping of a beat (A-V Wenckebach) or reversion to the initial conduction time (as in QRS Wenckebach). (05 Mar 2000) |