10 Diphtheria Symptoms
Reviewed: Dr. Mera
Symptom #7: Cyanosis
Cyanosis refers to the purplish or bluish discoloration of the mucous membranes and skin due to low oxygen saturation. It is most commonly seen in the lips and fingers. There are two types of cyanosis: central and peripheral. Central cyanosis occurs when there is poor blood oxygenation in the lungs, which causes discoloration in the mouth. Peripheral cyanosis occurs when inadequate or obstructed circulation causes discoloration in the hands and feet.
There are many possible causes of cyanosis, such as pneumonia, pulmonary embolism, heart failure, hypoventilation, and myocardial ischemia. In diphtheria, cyanosis occurs as membranes in the airway block respiration, causing difficulty breathing and low oxygenation.
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