Fjola D Sigurdardottir
, Suzanne M Bertisch, Michelle L Reid, Christopher R deFilippi, Joao A C Lima, Susan Redline, Torbjørn Omland
Studien er publisert i Sleep
Study objectives: To assess whether the association between insomnia and subclinical myocardial injury, as measured by cardiac troponin T (cTnT), differs across insomnia phenotypes.
Methods: We measured cTnT in 2188 participants in the Multi-Ethnic Study of Atherosclerosis (MESA) study who had completed sleep questionnaires and undergone unattended polysomnography (PSG) and 7-day actigraphy. Insomnia symptoms were defined as reporting at least one of the following ≥5 nights/week over the past four weeks: trouble falling asleep, waking up several times a night, having trouble getting back to sleep after you woke up too early or taking sleeping pills to help them sleep. OSA was defined as an apnea hypopneas index (AHI) >15. Participants were classified into insomnia phenotypes, including comorbid insomnia and OSA (COMISA) and insomnia associated with actigraphy estimated short sleep (<6hrs) or sleep fragmentation.
Results: The mean age was 68.6 years (SD 9.2), 53.6% were male. 47.8% met threshold levels for insomnia symptoms, and 43.1% had an AHI >15. In adjusted linear regression models COMISA (ß 0.08 (SE 0.03), p<0.01) or insomnia with short sleep duration (ß 0.07 (SE 0.03), p<0.05) were each associated with higher cTnT compared to a reference group with no insomnia. Insomnia with fragmented sleep (ß 0.03 (SE 0.02)) was not associated with higher cTnT (p>0.05) in adjusted analyses. OSA was associated with higher cTnT (ß 0.09 (SE 0.03), p<0.01) in adjusted models.
Conclusions: COMISA and insomnia with short sleep duration, but not insomnia symptoms alone or fragmented sleep, were associated with increased circulating cTnT in older adults.