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[Effect of hypoxia on intercellular interaction in the myocardium]
Biulleten' Eksperimental'Noi Biologii I Meditsiny
|July 1, 1976
Summary
Hypoxia decreases electrogenic membrane resistance and increases intracellular resistance in rabbit papillary muscle. This derangement in intercellular interaction is crucial for understanding cardiac arrhythmia mechanisms during ischemia.
Area of Science:
- Cardiovascular Physiology
- Biophysics
Background:
- Cardiac tissue exhibits anisotropic electrical properties.
- Hypoxia can disrupt normal cellular function and electrical signaling in the heart.
Purpose of the Study:
- To investigate the passive electrical properties of rabbit papillary muscle under hypoxic conditions.
- To elucidate the impact of hypoxia on membrane and intracellular resistances.
Main Methods:
- Measurements of input resistance and electrotonic decay length.
- Application of a two-dimensional anisotropic syncytium model.
Main Results:
- Electrogenic membrane resistance decreased 1.4-fold within 10 minutes of hypoxia onset.
- Longitudinal (sigma x) and transverse (sigma y) intracellular resistances increased by 1.39- and 1.3-fold, respectively.
- Increased intracellular resistance is attributed to elevated contact membrane resistance.
Conclusions:
- Hypoxia significantly alters passive electrical properties of cardiac muscle.
- Changes in intercellular interaction under hypoxia are critical for understanding cardiac arrhythmias.
- Findings are relevant to conditions like heart ischemia and myocardial infarction.