Severe hypoglycaemia and diabetic ketoacidosis in adults presenting to a hospital emergency department: Adverse prognostic markers for survival in type 2 diabetes and the role of SGLT2 inhibitors.

Aims: To determine the prognosis associated with severe hypoglycaemia (SH) and diabetic ketoacidosis (DKA) in adults presenting to a hospital emergency department (ED).

Methods: Medical records of adults with type 1 (T1D) and type 2 (T2D) diabetes who attended the ED with SH and DKA between 1 January 2019 and 30 June 2023, were reviewed for comorbidities, long-term survival, mortality and causes of death.

Results: A total of 429 episodes of DKA occurred in 293 people and 643 episodes of SH in 515 people. DKA predominated in T1D (77.6%) and SH in T2D (54.3%). In T2D, 32.3% of DKA events were associated with sodium-glucose cotransporter-2 inhibitor (SGLT2-i) medication. In both SH and DKA, patients with T2D were older and had more comorbidities than T1D, particularly cardiorenal disease, heart failure, cognitive impairment and cancer (all p < 0.005). Compared with T1D, mortality was higher in T2D after SH (48.4% vs. 19.9%, p < 0.005) and after DKA (30.8% vs. 13.4%, p = 0.001) with shorter median times to fatal outcome (SH: 134 vs. 511 days; DKA: 43 vs. 266 days, both p < 0.005). Long-term survival was lower (p < 0.005) and mortality risk was higher in T2D after index presentation with SH (HR 3.43 [95% CI: 2.43-4.84], p < 0.005) and DKA (HR 3.00 [95% CI: 1.77-5.10], p < 0.005). Irrespective of diabetes type, most causes of death in SH and DKA were non-cardiovascular.

Conclusions: SH and DKA events requiring hospital treatment herald a poor prognosis with greater mortality in T2D adults with multimorbidity. A significant number of DKA episodes in T2D occurred in people receiving SGLT2-i medication.