Resting Heart Rate and Sleep Disorders in Maturity-Onset Diabetes of the Young

Background: Sleep disturbances have been linked to higher resting heart rate (RHR), a marker of cardiovascular risk. Obstructive sleep apnea (OSA) and insomnia are common in other types of diabetes, but they have not been studied in Maturity Onset Diabetes of the Young (MODY), a unique subtype characterized by patients being lean and not using insulin. Objective: To evaluate sleep disorders and RHR in MODY. Methods: Participants were recruited from the Monogenic Diabetes Registry at the University of Chicago. The presence and severity of OSA was objectively assessed by a validated home screening device. Insomnia was assessed by a validated survey (Insomnia Severity Index). Resting (sleeping) heart rate was assessed by Fitbit activity tracker for 2 weeks. Results: Considering all patients (n=51; Table 1), OSA was found in 37% (31% mild, 2% moderate, 4% severe). Insomnia was found in 47% of patients (10% clinical insomnia and 37% subthreshold insomnia). Overall, the mean RHR was 66±9 bpm, with transcription factor (TF) related MODY (HNF1A, HNF4A, HNF1B) having significantly higher RHR compared to GCK-MODY (70±10 bpm vs. 63±8.7 bpm; p=0.01). Conclusion: OSA and insomnia are common in patients with MODY despite their lack of traditional risk factors for sleep disorders. TF-related MODY has a higher RHR compared to GCK-MODY. Future research should investigate the pathophysiology of sleep-diabetes relationship in MODY. Disclosure M.A.Arosemena: None. K.Wroblewski: None. E.Tasali: None. L.H.Philipson: Advisory Panel; Nevro Corp., Research Support; Novo Nordisk, Dompé, Provention Bio, Inc., Imcyse, Novo Nordisk Foundation.