407 Surgical Site Infection of Renal Transplant Patients Stratified by BMI

Aim

Surgical site infection increases with BMI with values ranging from 20% to greater than 40%. There are increasing numbers of obese patients (BMI >30) undergoing transplants and this audit aims to review the incidence and grade of surgical site infection (SSI) of renal transplant recipients stratified by BMI.

Method

65 renal transplants were performed between April 2020-March 2021 with 58 kidneys from deceased donors and 7 kidneys from live donors. A retrospective review of clinical attendances, GP letters, prescriptions, imaging, and re-admissions was completed. Nearly one-third of the patients had pre-transplant diabetes (32%), and their median BMI was 28 (range 19–40.7). The incidence of SSI was reported after 3 months follow up and graded using the Clavien-Dindo Classification.

Results

The overall rate of SSI was 15%. SSI was 12.8% in patients with BMI<30, 15.8% in BMI 30–34.9, 33.3% in BMI 35–35.9, and 0 in BMI>40 (only one recipient). There was no significant correlation between diabetes and SSI, with 19% of SSI reported in diabetic patients versus 14% in patients without diabetes (p-value=0.7). Two patients had a Clavien-Dindo grade I infection, 1 grade II, and 7 Grade III, with no grade IV or V SSI. No patients required operative management of SSI.

Conclusions

The overall rates of SSI stratified by BMI were within expected limits. Diabetes was not an independent predictor of SSI. No complication required general anesthesia or surgical treatment. When SSI did occur in obese patients it did cause considerable morbidity through number of attendances for dressing changes over 3 months.

663 Potential for Prophylactic Antibiotics in Renal Transplantation: A Retrospective Study of Kidney Perfusion Fluid Cultures and Kidney Cold Ischaemic Time

Aim

Infection is a significant cause of morbidity in kidney transplantation, and it is believed that an increased cold ischemic time is an independent risk factor. Identification of common pathogens in perfusion fluids, as well as the safe limit of cold ischaemic time can be used to reduce the risk of postoperative complications. There are currently no guidelines for prophylactic antibiotics.

Method

This is a retrospective review of the microbiological analysis of kidney perfusion fluids samples for a recipient transplant between 2017–2020. 100 patients were identified in this time period and this data was compared against the cold ischaemic time of the donor kidney.

Results

23% (22/96) samples were positive for bacteria with the majority being gram positive cocci. The most common bacteria grown was Coagulase Negative Staphylococcus (44% - 11/25). However, a broad spectrum of bacteria was grown including Hafnia, Pseudomonas, Klebsiella, Kocuria and E-coli. 3% (3/96) of samples grew two different species of bacteria.

The mean cold ischemic time for all transplants was 799 minutes with a range of 281–1618 minutes. The mean for infected samples was 935 mins with a range of 645–1410. Samples that grew 2 bacteria had a range of 913–941 mins.

Conclusions

There is potential to reduce the risk of infection with the use of broad-spectrum induction antibiotics and it is important that potential bacterial species and common resistance profiles are covered. There is a possible correlation between increased cold ischaemic time and bacterial growth in perfusion fluid however further research is warranted.