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Sleep and vascular disorders.

Gérard E Plante1

  • 1Department of Medicine (Nephrology), Institute of Geriatrics, University of Sherbrooke, Sherbrook, Québec, Canada JIH 5N4. gerard.plante@usherbrooke.ca

Metabolism: Clinical and Experimental
|September 19, 2006
PubMed
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Sleep disturbances can cause cardiovascular diseases like hypertension and arrhythmias. Early identification of heart rate abnormalities during sleep can help prevent future cardiovascular events.

Area of Science:

  • Cardiology
  • Sleep Medicine
  • Physiology

Background:

  • Cardiovascular diseases (CVD) like heart failure and coronary insufficiency can impair sleep.
  • Physiologic events during sleep and chronic sleep deprivation can increase the risk of CVD, including hypertension, atherosclerosis, stroke, and cardiac arrhythmias.
  • Abnormalities in heart rate during sleep in normotensive individuals can predict future CVD.

Purpose of the Study:

  • To explore the bidirectional relationship between sleep and cardiovascular health.
  • To identify sleep-related factors that contribute to or exacerbate cardiovascular conditions.
  • To investigate potential early detection and preventive strategies for CVD linked to sleep.

Main Methods:

  • Utilizing spontaneously hypertensive rats to study sympathetic nervous system (SNS) activity during sleep.

Related Experiment Videos

  • Employing maneuvers like hypoxia induction to elicit abnormal blood pressure responses during sleep.
  • Analyzing human subject data, including nocturnal arterial blood pressure patterns ('dippers' vs. 'nondippers') and their association with sleep quality and SNS activity.

    • Main Results:

    • Heart rate abnormalities during sleep in normotensive subjects are predictive of later CVD.
    • Abnormal blood pressure responses during sleep, elicited by maneuvers like hypoxia, can identify impending cardiovascular problems.
    • Spontaneously hypertensive rats exhibit different responses to SNS stimulation during sleep compared to normal rats.
    • 'Nondippers' (those with no nocturnal blood pressure drop) show poor sleep, increased SNS activity, and higher CVD mortality risk.
    • Chronic sleep deficit is a risk factor for obesity and metabolic syndrome.
    • Obstructive sleep apnea (OSA) is linked to obesity and increases stroke/transient ischemic attack risk.

    Conclusions:

    • Sleep is a critical factor in cardiovascular health, with bidirectional influences.
    • Identifying sleep-related cardiovascular risks, such as heart rate abnormalities and 'nondipping' blood pressure, allows for preventive measures.
    • Further research into circadian rhythm disruptions, melatonin, and sleep apnea is crucial for understanding and managing CVD.