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Related Concept Videos

Heart Failure I: Introduction01:27

Heart Failure I: Introduction

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Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...
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Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Regulation of Stroke Volume01:27

Regulation of Stroke Volume

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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
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Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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2-Vessel Occlusion/Hypotension: A Rat Model of Global Brain Ischemia
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Brain-Heart Interaction: Cardiac Complications After Stroke.

Zhili Chen1, Poornima Venkat1, Don Seyfried1

  • 1From the Gerontology and Neurological Institute, Tianjin Medical University General Hospital, China (Z.C., T.Y., J.C.); Department of Neurology, Henry Ford Hospital, Detroit, MI (P.V., D.S., M.C., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.).

Circulation Research
|August 5, 2017
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Summary

Neurocardiology explores brain-heart interactions. Stroke can cause cardiac dysfunction, leading to severe outcomes or milder conditions like Takotsubo cardiomyopathy, highlighting the critical link between brain injury and heart health.

Keywords:
brain injurybrain ischemiaheart failureinflammationstroke

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Area of Science:

  • Neurocardiology
  • Cardiovascular Medicine
  • Neurology

Background:

  • Cardiovascular complications are the second leading cause of post-stroke mortality.
  • Emerging evidence suggests a causal relationship between brain damage and heart dysfunction.
  • Understanding brain-heart interactions is crucial for stroke patient outcomes.

Purpose of the Study:

  • To review cardiac dysfunction following stroke (ischemic stroke, brain hemorrhage, subarachnoid hemorrhage).
  • To explore the mechanisms underlying brain-heart interactions post-stroke.
  • To discuss clinical manifestations and biomarkers of cardiac complications.

Main Methods:

  • Literature review of clinical and experimental evidence.
  • Analysis of stroke location and lateralization effects on brain-heart interaction.
  • Discussion of neurobiological and systemic mechanisms.

Main Results:

  • Stroke-induced cardiac damage can range from fatal outcomes to recoverable conditions like neurogenic stress cardiomyopathy.
  • The location and lateralization of brain lesions influence brain-heart interactions.
  • Multiple mechanisms, including the HPA axis, catecholamine surge, and inflammation, mediate these interactions.

Conclusions:

  • Cardiac dysfunction is a significant complication of stroke with diverse clinical implications.
  • Understanding the mechanisms of brain-heart interaction is vital for managing stroke patients.
  • Further research into neurocardiology can improve stroke care and patient prognosis.