Table 2.
Preoperative comorbidity of enrolled participants.
| Preoperative comorbidity△ | CFNB group | PCIA group | P value |
|---|---|---|---|
| n/N (%) | n/N (%) | ||
| Cardiovascular system | |||
| Hypertension | 41/140 (34.2) | 29/140 (24.2) | 0.098 |
| Coronary artery disease | 7/140 (5.8) | 7/140 (5.8) | 1.000 |
| Arrhythmia | |||
| Atrial fibrillation | 1/140 (0.8) | 1/140 (0.8) | 1.000∗ |
| Ventricular premature | 0/140 (0) | 3/140 (2.5) | 0.247∗ |
| Sinus bradycardia | 0/140 (0) | 2/140 (1.7) | 0.498∗ |
| Respiratory system | |||
| Asthma | 2/140 (1.7) | 0/140 (0) | 0.498∗ |
| COPD | 4/140 (3.3) | 8/140 (5.7) | 0.238 |
| Respiratory failure | 1/140 (0.8) | 1/140 (0.8) | 1.000∗ |
| Urological system | |||
| Renal syndrome | 0/140 (0) | 1/140 (0.8) | 0.500∗ |
| Renal failure | 0/140 (0) | 1/140 (0.8) | 0.500∗ |
| Endocrine system and autoimmune disease | |||
| Diabetes | 18/140 (15) | 9/140 (7.5) | 0.068 |
| Rheumatoid arthritis | 0/140 (0) | 3/140 (2.1) | 0.247∗ |
| Thromboembolic events | |||
| Cerebral embolism | 2/140 (1.7) | 0/140 (0) | 0.498∗ |
| Myocardial infraction | 0/140 (0) | 0/140 (0) | |
| Venous thrombosis | 0/140 (0) | 2/140 (1.7) | 0.498∗ |
| Peripheral artery embolism | 0/140 (0) | 0/140 (0) |
△Categorical variables as number of events (n), Chi square test was used; events less than 5 were compared with Fisher's exact test, *P < 0.05.