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Role of ion channels in heart failure and channelopathies
Ann-Kathrin Rahm1, Patrick Lugenbiel1, Patrick A Schweizer1
1Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
Insights
Heart failure (HF) causes electrical and contractile dysfunction, increasing risks for dangerous arrhythmias. Understanding ion channel remodeling in HF is crucial for developing targeted therapies to improve patient outcomes.
Area of Science:
- Cardiology
- Molecular Biology
- Electrophysiology
Background:
- Heart failure (HF) involves impaired cardiac contractile and electrical function.
- HF patients face risks of life-threatening ventricular and atrial arrhythmias, such as atrial fibrillation (AF).
- HF induces significant structural and electrical remodeling, creating a substrate for arrhythmias.
Purpose of the Study:
- To discuss ion channel remodeling processes in heart failure.
- To explore channelopathies associated with heart failure.
- To highlight the need for further research into HF pathophysiology for individualized therapies.
Main Methods:
- Review of distinct ion channel remodeling processes in HF.
- Analysis of structural remodeling, including fibrosis.
- Examination of intracellular calcium handling abnormalities.
Main Results:
- HF leads to remodeling of ion channels, gap junctions, and calcium handling.
- Fibrosis and electrical remodeling create an arrhythmogenic substrate.
- Both ventricular and atrial arrhythmias are common and contribute to mortality.
Conclusions:
- Ion channel remodeling is a key feature of heart failure pathophysiology.
- Further research is essential to identify molecular pathways for improved HF management.
- Individualized therapy based on ion channel composition is a future goal.
Abstract:
Heart failure (HF) is a complication of multiple cardiac diseases and is characterized by impaired contractile and electric function. Patients with HF are not only limited by reduced contractile function but are also prone to life-threatening ventricular arrhythmias. HF itself leads to remodeling of ion channels, gap junctions, and intracellular calcium handling abnormalities that in combination with structural remodeling, e.g., fibrosis, produce a substrate for an arrhythmogenic disorders. Not only ventricular life-threatening arrhythmias contribute to increased morbidity and mortality but also atrial arrhythmias, especially atrial fibrillation (AF), are common in HF patients and contribute to morbidity and mortality. The distinct ion channel remodeling processes in HF and in channelopathies associated with HF will be discussed. Further basic research and clinical studies are needed to identify underlying molecular pathways of HF pathophysiology to provide the basis for improved patient care and individualized therapy based on individualized ion channel composition and remodeling.
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