Sun21November0452PM 17

Oxygen therapy may improve cyanosis due to:

True / False

Atrial septal defect with right to left shunting Correct

Left ventricular failure Correct

Bronchopneumonia Correct

Interstitial pulmonary fibrosis Correct

Methaemoglobinaemia Correct

Explanation

Oxygen therapy may improve cyanosis due to pneumonia, pulmonary fibrosis and left ventricular failure.

A patient with an ASD and Eisenmengers syndrome will have pulmonary hypertension. Hypoxia developing from a right to left shunt can be improved as oxygen is a potent pumonary vasodilator.

Oxygen will not improve hypoxia due to methaemoglobinaemia (as all of the available haemoglobin may already be fully oxygenated).

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