Simple evaluation on combined wound with seawater immersion

Jiwei CHENG; Xinan LAI; Chunzhi LI; Baoming WU

ABSTRACT

BACKGROUND:

To establish experimental animal model for rapid evaluation of combined wound with seawater immersion so as to benefit wound healing and recovery.

OBJECTIVE:

To explore the plan of simple evaluation of combined wound with seawater immersion.

DESIGN:

Group division and controlled experiment was designed.

SETTING:

Second Department of Orthopaedics, the 113 Hospital of Chinese PLA; Research Institute of Surgery, Daping Hospital, Third Military Medical University of Chinese PLA MATERIALS Totally 32 health hybridized adult dogs were employed,mass weighted varied from 12 to 15 kg, of either sex.

METHODS:

The experiment was performed partially in the specific sea area of the Fifth and Sixth Room , Research Institute of Surgery of Daping Hospital of the Third Military Medical University of Chinese PLA from October 2001 to June 2002. The dogs were randomized into burn-blast combined wound group and projectile-burn combined wound group and each group was subdivided into immersion group (10 dogs) and the control (6 dogs). Burn-blast combined wound group The model of burn and mild blast injury was prepared. In the control, the dogs were put in a room at 25 ℃ directly after injury; But in immersion group, the dogs were immersed immediately in simulated seawater with holder. Projectile-burn combined wound group The model of burn and mild projectile injury was prepared. The managements were same as the previous after injury in the control and immersion group. The change of physiologic indexes was observed in 28 hours after injury. The indexes related to death were picked up for correlative analysis and establishing wound scoring scale, inducing body temperature, heart rate, mean arterial pressure (MAP), chloride concentration, PaO2 and causative factor, 0-5 score were designed, the higher the score was, the higher mortality would be.MAIN OUTCOME

MEASURES:

① Analysis of dead cases in each group. ② Wound scoring. ③ Verification of wound in scoring scale.

RESULTS:

32 dogs all entered result analysis. ① Analysis of dead cases and relationship Totally, 12 dogs were died. The peak of death was in 10-12hours, no matter the immersion happened or not. 5 indexes were associated significantly with death, named body temperature, heart rate, MAP, PaO2 and chloride concentration (P ＜ 0.05). ② Comparison of wound scoring, predictive mortality and actual mortality in each group The results in burn-blast control were (5.89±3.25) score, 0 and 17% successively. Those in projectileburn control were (6.78±2.02), 25% and 33% successively. Those in burn blast immersion group were (9.50±4.20) scores, 50% and 30% and those in projectile-burn immersion group were (11.13±3.57) scores, 50% and 60%.

CONCLUSION:

① The established scoring scale is apt to obtain common physiological indexes so as to evaluate the wound rapidly, which is applica ble for either seawater immersed cases or non-immersed cases, indicating extensively applications. ② The correction of evaluation is acceptable with verification. ③ The scale is based on animal experimental data, for which,it is still different from the one of real wound evaluation.