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Related Concept Videos

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

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The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
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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...
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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Related Experiment Video

Updated: Apr 11, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Cardiac resynchronization therapy and cardiac sympathetic function.

Cristian Martignani1, Igor Diemberger1, Cristina Nanni2

  • 1Institute of Cardiology, University Hospital S. Orsola-Malpighi Bologna, University of Bologna, Bologna, Italy.

European Journal of Clinical Investigation
|June 4, 2015
PubMed
Summary
This summary is machine-generated.

Cardiac resynchronization therapy (CRT) improves cardiac sympathetic nerve activity in heart failure responders. Non-responders show no significant changes, suggesting CRT is most effective when the neuroautonomic system is preserved.

Keywords:
11C-hydroxyephedrinecardiac resynchronization therapyheart failureneuroautonomic systempositron emission tomography

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Area of Science:

  • Cardiology
  • Nuclear Medicine
  • Neuroscience

Background:

  • Cardiac resynchronization therapy (CRT) improves outcomes in advanced heart failure but mechanisms remain unclear.
  • Approximately one-third of patients do not benefit from CRT, highlighting the need to understand response predictors.
  • Limited data exist on CRT's impact on sympatho-vagal function, a potential key mechanism.

Purpose of the Study:

  • To investigate the effect of CRT on cardiac sympathetic nerve activity using (11)C-hydroxyephedrine positron emission tomography.
  • To identify predictors of CRT response related to sympathetic nervous system function.
  • To evaluate changes in cardiac sympathetic nerve activity at short and medium term after CRT.

Main Methods:

  • Ten patients with dilated cardiomyopathy underwent clinical and echocardiographic assessment before and after CRT.
  • (11)C-hydroxyephedrine positron emission tomography was used to evaluate cardiac sympathetic nerve activity.
  • Patients were assessed acutely and at 3 months post-CRT.

Main Results:

  • CRT responders demonstrated higher left ventricular radiotracer uptake at baseline and post-CRT compared to non-responders.
  • Responders showed progressive improvement in the homogeneity of left ventricular tracer uptake.
  • Non-responders did not exhibit significant changes in cardiac sympathetic nerve activity.

Conclusions:

  • CRT enhances cardiac sympathetic nerve activity in responders, indicating improved sympathetic function.
  • Non-responders to CRT do not show significant alterations in cardiac sympathetic nerve activity.
  • CRT appears more effective in patients with a structurally preserved but functionally impaired neuroautonomic system.