Relationship between circadian blood pressure variability and function of islet α and β cell in type 2 diabetes with dyssomnia

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AimsTo investigate the relationship between circadian blood pressure (BP) variability and function of islet α and β cell in type 2 diabetes (T2D) with dyssomnia. MethodsPatients with T2D were divided into dyssomnia group and non-dyssomnia group by PSQI. OGTT, insulin and glucagon-releasing test were tested, and ambulatory BP was monitored for 24hours to compare two groups with α and β cell, circadian BP variability and fasting and post-meal BP variability. The correlation and regression analysis were made between PSQI and other indicators. ResultsIn dyssomnia group, ① Glucagon, glucagon/insulin ratio and AUCG were significantly higher (P<0.05). ② Fasting insulin (13.32±4.54 mIU/L), AUCI (8.51±0.54) and HOMA-IR (4.62±1.11) were high (P<0.05). But ISI (−4.27±0.77) was low (P<0.05). ③ Mean 24-hour and nighttime SBP and DBP, as well as their standard deviations and coefficients of variation, were all higher in the dyssomnia group (P<0.05). Multiple stepwise regression analysis showed that PSQI score was positively related to AUCG, HOMA-IR, nighttime SBP, and negatively related to ISI and nocturnal BP fall (P<0.05). ConclusionDyssomnia may cause abnormal circadian BP variability through various mechanisms. Improving dyssomnia can help to better function the islet α and β cell and restore normal circadian BP variability.