Wenckebach, Karel F.
(veng'kĕ-bok‵ 
)
Dutch internist, 1864–1940.
W. period A form of incomplete heart block in which, as detected by electrocardiography, there is progressive lengthening of the P-R interval until there is no ventricular response; and then the cycle of increasing P-R intervals begins again. SYN: Wenckebach phenomenon.