Circadian Biology in Obstructive Sleep Apnea-Associated Cardiovascular Disease

Area of Science:

• Chronobiology
• Cardiology
• Sleep Medicine

Background:

• A dysregulated circadian system is independently linked to Obstructive Sleep Apnea (OSA) and cardiovascular disease (CVD).
• The coexistence of OSA and CVD is common, particularly in patients with untreated OSA, but the role of circadian disruption remains unclear.
• Circadian rhythms influence numerous physiological functions, including blood pressure and heart rate, suggesting a potential mechanistic link.

Purpose of the Study:

• To provide a comprehensive overview of circadian dysregulation in OSA and its association with CVD.
• To explore potential clock-regulated mechanisms connecting OSA and CVD.
• To discuss animal models and future research directions for understanding this relationship.

Main Methods:

• Literature review and synthesis of existing research on circadian rhythms, OSA, and CVD.
• Identification of potential molecular and physiological pathways linking circadian dysregulation to cardiovascular health in the context of OSA.
• Discussion of relevant animal models for experimental investigation.

Main Results:

• Circadian dysregulation is a significant factor potentially mediating the relationship between OSA and CVD.
• Multiple clock-regulated mechanisms, including oxygen sensing, inflammation, cardiovascular processes, oxidative stress, metabolic regulation, hormone signaling, and epigenetics, are implicated.
• The review highlights the complexity of the interplay between circadian biology, sleep apnea, and heart disease.

Conclusions:

• Circadian dysregulation is a plausible mechanism contributing to the frequent coexistence of OSA and CVD.
• Further research, including studies in animal models, is needed to elucidate these complex relationships.
• Understanding these connections may lead to novel therapeutic strategies for patients with OSA and cardiovascular conditions.