Association of type 2 diabetes with prolonged hospital stay and increased rate of readmission in patients with lower limb cellulitis.

Abstract

Lower limb (LL) cellulitis-related hospitalisations are prevalent in type 2 diabetes subjects. We assess its costs and factors associated with length of stay and readmissions. A retrospective case-control study at an urban hospital servicing a multi-ethnic population in New Zealand, where 7% of the adult population is estimated to have diabetes. Admissions with LL cellulitis in 2008-2013 were identified using coding records. Subsequent hospitalisations after 1 month with the same diagnosis were classified as readmissions. Glycaemic control was assessed by HbA1c measured within 6 months of the index admission. There were 4600 admissions with LL cellulitis in 3636 patients, including 719 patients (20%) with type 2 diabetes. Hospital stay was longer for type 2 diabetes patients (median 5.3 vs 3.0 days, P < 0.001), independent of age, ethnicity and HbA1c. Accompanying LL ulceration was more frequent in type 2 diabetes patients (50% vs 17%, P < 0.001); however, admissions remained longer for type 2 diabetes patients without ulceration (median 3.4 vs 2.8 days, P < 0.001). Readmission rates were also higher in type 2 diabetes patients compared to non-diabetes patients (HR 1.7, P < 0.001), even in the absence of ulceration (HR 2.2, P < 0.001). Age, HbA1c and ethnicity did not distinguish those prone to readmissions in the type 2 diabetes cohort. Type 2 diabetes patients accounted for a fifth of all admissions and one third of the estimated costs. A high proportion of patients with type 2 diabetes was admitted with LL cellulitis. They had significantly longer admissions and higher readmission rates. Age, HbA1c and ethnicity did not predict length of stay or recurrence.