Clues to Differential Diagnosis of Central Cyanosis: Onset of cyanosis, Clubbing, Secondary erythrocytosis, Auscultation, X-ray, Echocardiography, Arterial gas
 - Cyanotic heart defect
 - Pulmonary diseases
 - Pulmonary AV malformations (PAVMs)
 - Methemoglobinemia

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