[Risk factors for postoperative indwelling catheter following enhanced recovery after total knee arthroplasty]

To evaluate the risk factors for postoperative indwelling catheter following enhanced recovery after primary unilateral total knee arthroplasty (TKA) under general anesthesia.

Patients who underwent primary unilateral TKA under general anesthesia between January 2017 and August 2018 were enrolled in the study. Among them, 205 patients who met the selection criteria were included in the study, and the clinical data were collected, including gender, age, body mass index, preoperative range of motion, Hospital for Special Surgery (HSS) score, American Society of Anesthesiologists (ASA) score, disease type, comorbidity, hemoglobin, hematocrit, blood volume, length of operation and operation time, whether to keep drainage after surgery, intraoperative blood loss, total blood loss, and preoperative, intraoperative, postoperative fluid infusions, and total fluid infusion on the day of surgery, urine volume on the day of surgery. Univariate analysis and logistic regression analysis were used to screen the risk factors for postoperative indwelling catheter. Length of stay and incidences of complications (intermuscular vein thrombosis, deep vein thrombosis, pulmonary embolism, incision swelling and exudation, electrolyte disorder, nausea and vomiting, and urinary tract infection) were compared between the patients with or without indwelling catheter.

Indwelling catheter occurred in 41 (20%) of 205 patients. Single factor analysis showed that the influence factors were age, gender, keeping drainage after surgery, total fluid infusion and urine volume on the day of surgery ( P<0.05). The multiple factors analysis showed that the males and more urine volume on the day of surgery were the significant risk factors for indwelling catheter after primary TKA ( P<0.05). In addition, postoperative length of stay was shorter and the incidence of urinary tract infection was lower in non-indwelling catheter group than in indwelling catheter group, showing significant differences ( P<0.05).

The male patients with more urine on the day of surgery have higher risk for indwelling catheter after primary unilateral TKA under general anesthesia with an enhanced recovery program.