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Related Concept Videos

Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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...
Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

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...
Heart Failure I: Introduction01:27

Heart Failure I: Introduction

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...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Heart Failure IV: Classification and Diagnostic Evaluation01:30

Heart Failure IV: Classification and Diagnostic Evaluation

Heart failure can be classified in various ways, with the most common classifications based on physical activity limitations, disease progression, severity, and treatment strategies.The Functional Classification of Heart Failure divides patients into four categories based on physical activity limitation due to symptom burden.Class I: Patients in this class have cardiac disease but no physical activity limitations. Ordinary activities like walking, climbing stairs, or routine tasks do not cause...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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 blood...

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Related Experiment Video

Updated: Jul 13, 2026

Myocardial Infarction and Functional Outcome Assessment in Pigs
12:03

Myocardial Infarction and Functional Outcome Assessment in Pigs

Published on: April 25, 2014

Cardiac autonomic dysfunction and functional outcome after ischaemic stroke.

A Bassi1, F Colivicchi, M Santini

  • 1I.R.C.C.S. Santa Lucia Foundation, Rome, Italy. a.bassi@hsantalucia.it

European Journal of Neurology
|July 31, 2007
PubMed
Summary

Cardiac autonomic imbalance, measured by heart-rate variability (HRV), predicts poor functional recovery in ischaemic stroke survivors post-rehabilitation. Early HRV assessment can guide recovery expectations.

Related Experiment Videos

Last Updated: Jul 13, 2026

Myocardial Infarction and Functional Outcome Assessment in Pigs
12:03

Myocardial Infarction and Functional Outcome Assessment in Pigs

Published on: April 25, 2014

Area of Science:

  • Cardiology
  • Neurology
  • Rehabilitation Medicine

Background:

  • Ischaemic stroke often leads to impaired cardiac autonomic balance.
  • Understanding factors influencing functional outcome post-stroke is crucial for effective rehabilitation.

Purpose of the Study:

  • To assess the impact of cardiac autonomic derangement on functional outcomes after rehabilitation in recent ischaemic stroke survivors.
  • To identify predictors of unfavorable functional recovery.

Main Methods:

  • 85 first-ever ischaemic stroke survivors underwent 24-hour Holter monitoring before a 60-day rehabilitation program.
  • Time-domain measures of heart-rate variability (HRV) were analyzed.
  • Multivariate analysis identified predictors of unfavorable functional outcome (Barthel Index <75).

Main Results:

  • 44.7% of patients had an unfavorable functional outcome post-rehabilitation.
  • Independent predictors of poor outcome included older age, stroke severity, lower admission Barthel Index, higher admission Rankin Scale score, and lower standard deviation of RR intervals (a measure of HRV).
  • Lower HRV values were strongly associated with unfavorable functional outcomes.

Conclusions:

  • Cardiac autonomic derangement, indicated by reduced HRV, is a significant predictor of poor functional recovery after stroke rehabilitation.
  • Pre-rehabilitation HRV assessment may offer valuable prognostic information for stroke survivors.
  • Integrating HRV assessment into stroke care could improve personalized rehabilitation strategies and patient expectations.