DM / DNB Cardiology Entrance Mock Test 9

DM / DNB Cardiology Entrance Mock Test 9

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Question 1Mechanism of pulmonary hypertension in COPD:AAll of the aboveBLoss of small vesselsCMechanical effect of high lung volumeDAlveolar hypoxiaQuestion 1 Explanation:  Mechanisms of pulmonary hypertension in chronic obstructive pulmonary disease are as follows:

1. Alveolar hypoxia is a potent stimulus for pulmonary vasoconstriction. Oxygen is one of the most potent pulmonary vasodilators.
2. Hypercarbia due to carbon dioxide retention causes acidosis and consequent pulmonary hypertension.
3. Mechanical effect of the high lung volume on pulmonary vessels causes increase in pulmonary arterial pressures.
4. Loss of small vessels in the vascular bed in regions of lung destruction increases the ...

Source: Cardiophile MD - January 27, 2016 Category: Cardiology Authors: Prof. Dr. Johnson Francis, MD, DM, FACC, FRCP Edin, FRCP London Tags: Cardiology MCQ DM / DNB Cardiology Entrance Featured Source Type: blogs