First branch of the pulmonary artery

What does "First branch of the pulmonary artery" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

The "first branch of the pulmonary artery" refers to the initial split of a major blood vessel that comes from the heart. This artery carries blood that is low in oxygen from the heart to the lungs. When it reaches the lungs, it splits into two - one pathway for each lung. This is what is meant by the "first branch" - it's the first major division of this artery that directs blood into each lung for oxygenation.

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