protodiastolic gallop

pro·to·di·a·stol·ic gal·'lop

gallop rhythm in which the gallop sound occurs in early diastole and is an abnormal third heart sound.

pro·to·di·a·stol·ic gal·lop

(prō'tō-dī'ă-stol'ik gal'ŏp) Rhythm in which the gallop sound is an abnormal third heart sound.