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Related Concept Videos

Overview of Systemic and Pulmonary Circulation01:15

Overview of Systemic and Pulmonary Circulation

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The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
The oxygenated blood is sent...
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Coronary Circulation01:21

Coronary Circulation

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The heart, an organ critical to survival, gets nourishment not from the blood it pumps but from a separate circulation system known as coronary circulation. This is the shortest circulation in the body and is responsible for supplying the heart with the nutrients it needs to function effectively.
Coronary circulation begins at the base of the aorta, where two main arteries arise—the left and right coronary arteries. These arteries encircle the heart in the coronary sulcus and supply the...
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Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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Physiology of the Heart: The Cardiac Cycle01:18

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The cardiac cycle describes the events from one heartbeat to the next. It includes three main phases: diastole, atrial systole, and ventricular systole, all driven by changes in chamber pressures and the function of heart valves.
Diastole: The Relaxation Phase
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Aortic Regurgitation I: Introduction01:15

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IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
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Related Experiment Video

Updated: May 5, 2026

Direct Re-implantation of Left Coronary Artery into the Aorta in Adults with Anomalous Origin of Left Coronary Artery from the Pulmonary Artery ALCAPA
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Flow reversal in coronary collaterals.

P Urban1, B Meier, L Finci

  • 1Cardiology Centre, University Hospital, Geneva, Switzerland.

European Heart Journal
|December 1, 1987
PubMed
Summary
This summary is machine-generated.

Collateral flow reversal after angioplasty is a rare event. This case highlights a new cause due to a secondary lesion, with significant clinical implications.

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Area of Science:

  • Cardiovascular Medicine
  • Interventional Cardiology
  • Vascular Biology

Background:

  • Percutaneous coronary intervention (PCI) is a common treatment for coronary artery disease.
  • Collateral circulation plays a vital role in myocardial perfusion in the presence of stenotic lesions.
  • Angioplasty aims to restore antegrade flow, potentially altering collateral dynamics.

Observation:

  • A case of collateral flow reversal was observed seven months post-angioplasty.
  • The reversal was attributed to the progression of a new lesion in a different coronary artery.
  • This specific scenario following angioplasty has not been previously documented.

Findings:

  • The study identified a novel mechanism for collateral flow reversal.
  • Progression of a secondary lesion, not the treated one, induced the observed phenomenon.
  • This suggests dynamic changes in coronary collateral function after intervention.

Implications:

  • The findings necessitate careful consideration of collateral circulation in patients with complex coronary artery disease.
  • Clinical monitoring strategies may need adjustment to account for potential collateral flow alterations.
  • Understanding these dynamics is crucial for optimizing long-term outcomes after angioplasty.