<正> Objective: To summarize practical experiences of clinical application of artificial heart and discuss itsindications and prevention of complications. Methods: Before operation, all the four patients underwent regulartreatment of internal medicine, and after its failure they were implanted with artificial hearts. Operations were per-formed under genera1 anesthesia and external circulation at low temperature. Left ventricle assistant devices(LVAD) were used for three patients, and double ventricle assistant device (DVAP) for one. Two patients wereembeded with Berlin artificial hearts (Melipot company). The other two were implanted with Medos artificial hearts(Medos company). Results: All the patients had no infection and haemorrhage, while their cardiac functions were re-