ICU Primary PrepCast #025- CVS Physiology Part 1
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Oct 30, 2019 The podcast delves into coronary circulation, electrical conduction system of the heart, ECG physiology, and cardiac cycle events. Topics include oxygen extraction ratios, pacemaker potentials, and studying physiology with humor.
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Coronary Circulation Overview
- The heart's coronary arteries originate at the aorta's base, branching into smaller vessels supplying the myocardium.
- The left main coronary artery divides into the circumflex and left anterior descending arteries, while the right coronary artery supplies the right heart and often the posterior descending artery.
Coronary Blood Flow Regulation
- Coronary blood flow is autoregulated based on oxygen demand via mechanisms like metabolic factors and myogenic regulation.
- Metabolic factors like adenosine and nitric oxide cause vasodilation, while myogenic regulation adjusts vessel diameter based on pressure changes.
Exam Preparation Tip
- Rishi advises primary exam candidates to thoroughly study coronary circulation.
- He highlights its importance in exams, appearing as short answer questions or in vivas.