TY - RPRT TI - Relation between cyclic variation in echo amplitude and segmental contraction in normal and abnormal hearts. AU - D A Lythall AU - R B Logan-Sinclair AU - C J Ilsley AU - S S Kushwaha AU - M H Yacoub AU - D G Gibson PY - 1991 DO - 10.1136/hrt.66.4.268 UR - https://pubmed.ncbi.nlm.nih.gov/1747276/ ID - 1747276 ER -