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Related Concept Videos

Stroke: Introduction and Types01:29

Stroke: Introduction and Types

A stroke is an acute neurological event caused by the sudden disruption of cerebral blood flow, leading to rapid loss of neuronal function. Neurons depend on continuous oxygen and glucose supply, so even brief interruptions can cause irreversible injury within minutes. Strokes are classified into ischemic and hemorrhagic types.Ischemic StrokeIschemic strokes are most common and occur due to arterial occlusion, depriving brain tissue of oxygen and nutrients. This leads to energy failure, ionic...
Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
Sleep Apnea01:21

Sleep Apnea

Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...

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A Middle Cerebral Artery Occlusion Technique for Inducing Post-stroke Depression in Rats
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Published on: May 22, 2019

Sleep and stroke.

Antonio Culebras1

  • 1Department of Neurology, Upstate Medical University, Syracuse, New York 13210, USA. aculebras@aol.com

Seminars in Neurology
|September 11, 2009
PubMed
Summary

Sleep apnea significantly increases stroke risk and worsens outcomes post-stroke. Addressing sleep apnea may reduce blood pressure and stroke recurrence, but treatment tolerance in stroke patients is a challenge requiring further investigation.

Area of Science:

  • Neurology
  • Sleep Medicine
  • Cardiovascular Science

Background:

  • Sleep disturbances, particularly sleep apnea, are increasingly recognized as significant factors influencing brain function and cerebrovascular health.
  • Circadian rhythm disruptions are linked to a higher incidence of stroke, especially in the morning hours.
  • Sleep apnea is associated with key stroke risk factors like hypertension, ischemic heart disease, and diabetes.

Purpose of the Study:

  • To explore the multifaceted relationship between sleep, sleep apnea, and cerebrovascular pathology, with a focus on stroke.
  • To review the evidence for a causal link between sleep apnea and stroke.
  • To examine the impact of sleep apnea on stroke recovery and mortality, and the potential benefits of treatment.

Main Methods:

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  • Review of epidemiological studies and existing literature on sleep, sleep apnea, and stroke.
  • Analysis of the dose-response relationship between sleep apnea severity and systemic hypertension.
  • Evaluation of the effects of positive airway pressure ventilation on blood pressure and stroke risk in post-stroke patients.

    • Main Results:

    • A dose-response relationship exists between sleep apnea severity and the risk of developing systemic hypertension.
    • There is established evidence for a causal link between sleep apnea and stroke.
    • Sleep apnea is highly prevalent in stroke patients, negatively impacting rehabilitation, increasing secondary stroke risk, and mortality.

    Conclusions:

    • Sleep apnea is a critical, modifiable risk factor for stroke and a significant complication post-stroke.
    • While noninvasive positive airway pressure ventilation can lower blood pressure and stroke risk, patient tolerance in the stroke population is poor.
    • Further research is needed to identify effective strategies for managing sleep apnea in stroke survivors to improve outcomes and reduce mortality.