[The incidence and risk factors of acute renal injury in patients with multiple soft tissue injuries].

OBJECTIVE

To investigate the incidence and risk factors of acute kidney injury (AKI) in patients with multiple soft tissue contusion.

METHODS

A total of 513 patients diagnosed as multiple soft tissue contusion in the First Affiliated Hospital of Xinjiang Medical University from January 1, 2008 to January 1, 2013 were retrospectively analyzed. Demographics, clinical data and laboratory examinations before and after AKI were collected and analyzed.

RESULTS

The age of all subjects was 31.30(12-78) years old with the male to female ratio of 2.1: 1. AKI occurred in 74 cases with an incidence rate of 14.4%. No AKI was observed in patients with assault injuries, while AKI was found in 27 cases (36.5%) with car accident injuries and 4 cases (5.4%) with other injuries. AKI showed in 1 case(1.4%) with damaged area under 1%, in 4 cases (5.4%) with damaged area ranged from 1% to <3%, 10 cases (13.5%) with damaged area ranged from 3% to 5% and 19 cases (25.7%) with damaged area over 5% with significant difference among the groups (P < 0.01). Incidence rate of AKI was significantly higher in patients with chronic kidney disease (CKD) than those without CKD (54.5% vs 20.3%, P < 0.01). Two of the AKI cases died, with a mortality rate of 2.7%. Multivariate logistic regression analysis showed that the followings were the independent risk factors for the occurrence of AKI in patients with multiple soft tissue injuries: age (OR = 1.996), basic serum creatinine (OR = 0.976), basic evaluated GFR (eGFR) (OR = 0.964), serum potassium (OR = 2.117), myoglobin (OR = 0.950) and damaged area (OR = 1.811).

CONCLUSIONS

Incidence rate of AKI is quite high in multiple soft tissue contusion. Age, basic serum creatinine, basic eGFR, serum potassium, myoglobin and damaged area are the independent risk factors for the occurrence of AKI in patients with multiple soft tissue injury.