the presence of mitral valve prolapse in one patient with lown-ganong-levine syndrome and the persistence of prolapse in the presence and absence of pre-excitation in another patient with intermittent type b wolff-parkinson-white syndrome suggest that mitral valve prolapse in pre-excitation syndrome may not be secondary to the abnormal activation pattern of the left ventricle , which has been suggested as a possible mechanism by some investigators .
C0024054
lown-ganong-levine syndrome
C0032915
pre-excitation