Which of the following is responsible for draining deoxygenated blood from myocardium into the cardiac chambe… - RIMS Nursing Officer - 2022

RIMS Nursing Officer - 2022

Applied Anatomy

Easy

Appeared in: RIMS Nursing Officer - 2022

Explanation

The primary function of coronary veins is to collect deoxygenated blood and metabolic waste products from the heart muscle (myocardium).
After perfusing the heart tissue, this blood is channeled into a network of cardiac veins.
Most of these veins converge into the coronary sinus, a large vessel that empties the deoxygenated blood directly into the right atrium.
Some smaller veins, such as the anterior cardiac veins and Thebesian veins, also drain directly into the heart chambers.

Option A: Coronary arteries are responsible for supplying oxygenated blood to the myocardium, not draining deoxygenated blood from it.
Option C: Pulmonary arteries carry deoxygenated blood away from the right ventricle to the lungs for oxygenation. They are part of the pulmonary circuit, not the coronary circuit.
Option D: Pulmonary veins carry oxygenated blood from the lungs to the left atrium. They carry the wrong type of blood and are not involved in draining the myocardium.

Clinical Relevance

Nursing practice connection: Knowing Anatomy and Physiology of Coronary Circulation helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding coronary circulation is fundamental for nurses, especially in cardiology. Blockage of coronary arteries causes myocardial infarction (heart attack), and knowledge of venous drainage is crucial for understanding cardiac physiology and certain surgical procedures.
In conditions like right-sided heart failure, elevated pressure in the right atrium can impede venous drainage from the coronary sinus, potentially worsening myocardial ischemia by increasing congestion in the heart wall.
What if? - If a patient undergoes coronary artery bypass grafting (CABG), the surgeon creates new pathways for blood to reach the heart muscle. A nurse must monitor for signs of adequate reperfusion and be aware that venous drainage patterns can be altered post-surgery.

How to Approach the Question

First, identify the key terms in the question: 'draining', 'deoxygenated blood', and 'myocardium'.
Recall the basic functions of arteries and veins: arteries carry blood away from the heart, and veins carry blood toward the heart.
Differentiate between the two major circulatory loops connected to the heart: the pulmonary circulation (to/from the lungs) and the systemic circulation (to/from the body). The coronary circulation is a part of the systemic circuit that specifically serves the heart muscle.
'Myocardium' refers to the heart muscle itself. Therefore, you are looking for vessels that are part of the coronary circulation.
The term 'draining' indicates you are looking for veins. Combine this with 'coronary' to arrive at 'Coronary veins'.
Evaluate the other options to confirm: Pulmonary vessels are for the lungs, and coronary arteries supply blood, they don't drain it.

Concept Tested & Keywords

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E6 Anatomy Applied Ashalatha 4e pp. 162-164, 161-163