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[Autonomic control of cardiac function involves modulation of hyperpolarization activated channels in vitro]
N I Ziiatdinova1, A L Zefirov, F G Sitdikov
1Kazan State Medical University, 420012, Kazan, 49 Butlerov St., Russia.
Rossiiskii Fiziologicheskii Zhurnal Imeni I.M. Sechenova
|April 25, 2003
Summary
Hyperpolarization-activated currents (Ih) influence heart rate regulation. Blocking these currents and stimulating the vagus nerve both decrease heart rate, suggesting autonomic nervous system modulation.
Area of Science:
- Physiology
- Cardiovascular Science
- Neuroscience
Context:
- Heart rate regulation is complex, involving autonomic nervous system (ANS) and ion channel activity.
- Hyperpolarization-activated currents (Ih) play a role in cardiac pacemaking.
Purpose:
- To investigate the role of hyperpolarization-activated currents (Ih) in heart rate regulation.
- To explore the interaction between Ih and autonomic nervous system (ANS) control of heart rate.
Summary:
- Blocking Ih with ZD 7288 decreased heart rate in rats.
- Vagus nerve stimulation and vagotomy demonstrated dose-dependent effects on heart activity.
- Isoproterenol administration revealed a dependency of heart activity on Ih levels.
Impact:
- Findings suggest a modulatory role of the ANS on hyperpolarization-activated channel activity.
- This research provides insights into the mechanisms of heart rate control.
- Understanding Ih and ANS interactions may inform treatments for cardiac arrhythmias.