Sun14November1246PM 35

When investigating a patient with asthma:

True / False

Pulsus paradoxus is specific to asthma Correct

A pneumothorax is best seen on a chest x ray taken at end-expiration Incorrect answer selected

An eosinophilia differentiates extrinsic asthma from intrinsic asthma Correct

Flow-volume loops provide information on the calibre of small peripheral airways Incorrect answer selected

Mid-expiratory flow rate is independent of patient effort Correct

Explanation

The mid-expiratory flow rate is the expiratory flow rate in the middle of expiration. It mainly measures small airway calibre and is independent of the effort exerted by the patient. Maximum flow-volume loops provide information on inspiratory resistance, airway collapsibility and small airway calibre.

Pulsus paradoxus describes a fall in systolic blood pressure with inspiration and a difference of greater than 5 mmHg is abnormal. It is seen in normal individuals but an exaggerated response is seen in asthma, constrictive pericarditis and cardiac tamponade.

A small pneumothorax may only be visible on an end-expiratory chest x ray and frequently does not require intervention. However, if positive pressure ventilation is planned, the pneumothorax may enlarge significantly or develop into a life-threatening tension pneumothorax.

Eosinophilia is the most common haematological abnormality found in asthma and is a feature of both extrinsic (allergic) and intrinsic asthma.

Answer Statistics

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Average score: 58.01%

Times answered: 282