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Heart Failure Drugs: Inotropic Agents01:26

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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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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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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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The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
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β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation,...
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Electrically contractile polymers augment right ventricular output in the heart.

Arjang Ruhparwar1, Patricia Piontek, Matthias Ungerer

  • 1Department of Cardiac Surgery, University Hospital of Heidelberg, Heidelberg, Germany.

Artificial Organs
|April 3, 2014
PubMed
Summary

Electrically contractile polypyrrole polymers significantly enhanced right ventricular contraction in a rat model. This novel biomaterial approach offers new possibilities for myocardial tissue engineering and cardiac support.

Keywords:
Animal modelContractile polymersHeart failure approachesRight ventricleTissue engineering

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Area of Science:

  • Biomaterials Science
  • Cardiovascular Engineering
  • Tissue Engineering

Background:

  • Current artificial heart muscle development primarily uses stem cell-derived cardiomyocytes seeded on matrices.
  • Non-biological approaches to cardiac tissue engineering remain underexplored.
  • The study investigates electrically contractile polymers for cardiomyoplasty.

Purpose of the Study:

  • To evaluate the efficacy of electrically contractile polymer-based actuators for positive inotropic support of the right ventricle.
  • To assess the feasibility of using polypyrrole (PPy) actuators in a cardiac environment.

Main Methods:

  • Complex trilayer polypyrrole (PPy) bending polymers were fabricated for high-speed applications.
  • Strips of PPy polymers were attached to the right ventricle (RV) in a rat model (n=5).
  • RV pressure was invasively monitored, and polymer contraction was activated during diastole or systole to assess its impact on RV pressure generation.

Main Results:

  • In group 1 (diastolic activation), polymers generated a significant pressure (AUC: 2768 ± 875 U).
  • In group 2 (systolic activation), concomitant polymer contraction significantly increased RV pressure AUC compared to controls (5987 ± 1334 U vs. 4318 ± 691 U, P ≤ 0.01).

Conclusions:

  • Electrically contractile polymers can significantly augment right ventricular contraction.
  • This non-biological approach presents a promising avenue for myocardial tissue engineering.
  • Potential future applications may involve combination therapies with stem cell-derived cardiomyocytes.