Before operation, patients had severe pulmonary hypertension (96.9%), moderate and severe heart failure (71.9%), weak pulses at lower limbs (73.1%), severe respiratory failure (75%), pneumonia (59.4%), metabolic acidosis (43.8); acute renal failure (40.6%), cardiogenic shock (28.1%), sepsis (28.1%), malnutrition (34.4%), mental and motor retardation (3%).