To keep watch on a possible rejection, the patient must go every week in the first month or two for the taking of a small piece from the heart by way of an inserted tube.
為了隨時測知排斥情形，換心人在頭一、兩個月內，每星期都要做一次「心內膜切片」：從右頸靜脈插入一根帶小尖夾的導管，一直深入心臟，在心室中隔上夾下一小塊、約半顆芝麻大小的組織，做病理切片。