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Medicine

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Respiratory

Question
9 out of 11
 

Most common cause of cyanosis? (NEET 2013)



A Chronic bronchitis
B Emphysema

C Asthma
D Interstitial Lung fibroses

Ans. A

Chronic bronchitis

That is why patients of chronic bronchitis are known as blue bloaters. Cyanosis is not an important feature of emphysema that is why they are known as Pink puffers !!!

Cyanosis

Central Cyanosis Peripheral Cyanosis

Causes are

1). Decreased arterial Oxygen saturation

a. Decreased atmospheric pressure, high altitude

b. Impaired pulmonary function

i. Alveolar hypoventilation (chronic bronchitis)

MC cause

ii. Impaired O2 diffusion

c. Anatomic shunts

i. CHD'S (Rt à Lt)

ii. Pulmonary A-V fistula

d. Multiple small intrapulmonary shunts

2). Hemoglobin abnormalities

a. Methemoglobinemia

b. Sulfhemoglobinemia

c. Carboxyhemoglobinemia

Causes are­

It results from vasoconstriction and diminished peripheral blood flow e.g.

1). Reduced cardiac output

2). Cold exposure

3). Redistribution of blood flow from extremities

4). Arterial obstruction

5). Venous obstruction

Extra Edge:

1). Pulse oximetry allows non-invasive assessment of peripheral O2 saturation (SpO2).

2). It provides a useful tool for monitoring those who are acutely ill or at risk of deterioration.

3). On most pulse oximeters, the alarm is set at 90%.

4). Erroneous readings may be caused by: dyshaemoglobinaemias, and carbon monoxidepoisoning.

Controversy about the definition of cyanosis: Traditionally cyanosis is define as de oxygenated Hb >5gm% but in Harrison 18th edition page no 288, it says to be >4gm%.

Respiratory Flashcard List

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