Preoperative frailty assessment could be a predictive factor for the prognosis of elderly patients undergoing coronary artery bypass grafting: a retrospective case-control study

Table 5 Preoperative frailty assessment and postoperative complications

		Non-frail (n = 150)	Frail (n = 150)	P value
Circulatory system	Hypotension, n (%)	63 (42.00)	108 (72.00)	0.000**
	Arrhythmia, n (%)	9 (6.00)	51 (34.00)	0.000**
	Sudden cardiac arrest, n (%)	1 (0.67)	26 (17.33)	0.000**
Blood system	Anemia, n (%)	41 (27.33)	92 (61.33)	0.000**
	Low platelet count, n (%)	37 (24.67)	95 (63.33)	0.000**
Respiratory system	Acute respiratory distress syndrome, n (%)	20 (13.33)	67 (44.67)	0.000**
Nervous system	Postoperative cognitive dysfunction, n (%)	23 (15.33)	69 (46.00)	0.000**
Immune system	Infection, n (%)	17 (11.33)	79 (52.67)	0.000**
Liver system	Hyperbilirubinemia, n (%)	22 (14.67)	42 (28.00)	0.005**
Kidney system	High creatinine, n (%)	21 (14.00)	55 (36.67)	0.000**

Data are presented as number (%). Hypotension is defined as mean arterial pressure lower than 70 mmHg. Arrhythmia refers to the occurrence of postoperative atrial and ventricular arrhythmia. Sudden cardiac arrest refers to the sudden cessation of heart beating after surgery, regardless of whether it can be rescued after cardiopulmonary resuscitation. Anemia is a condition in which a hemoglobin level is less than 70 g/L and blood transfusion is required. Low platelet count is defined as a platelet count of less than 100*10^9/L. Acute respiratory distress syndrome is defined by an oxygenation index (PaO2/FiO2) of less than 300. Postoperative cognitive dysfunction refers to the occurrence of delirium and unconsciousness after surgery. Infection is defined as an increased white-cell count and a positive bacterial culture. Hyperbilirubinemia is defined as a bilirubin value higher than 34.2 umol/L. High creatinine is defined as a creatinine value higher than 133 umol/L
**P < 0.01

ISSN: 1471-2253