Sickle cell acute complications: Case

This boy has acute chest syndrome, the leading cause of death in sickle cell disease, emerging on the second day of a pain-crisis admission. The new right lower lobe infiltrate, the fever, the breathlessness, the cough, and the hypoxia together meet the definition, and the saturation of 89 percent on room air with the tachypnoea and the falling haemoglobin mark this as a moderate-to-severe episode that needs oxygen, antibiotics, and preparation for transfusion at once. The emergence after admission is typical, because the rib pain caused splinting and atelectasis that seeded the lung. ^[4]

Interpretation of the findings

The key findings are the new infiltrate, the hypoxia, the tachypnoea, and the falling haemoglobin, and together they define the acute chest syndrome and gauge its severity. The saturation of 89 percent on room air is below the target of 92 percent and confirms significant hypoxia, and the respiratory rate of 44 is raised for a four-year-old. The fall in the haemoglobin from a baseline of 75 g per litre to 62 g per litre reflects the haemolysis and the sequestration in the inflamed lung, and it signals that a transfusion is likely. ^[4]

The underlying pain crisis remains, and the combination of the chest and the limb pain explains why the boy splinted his chest and developed the atelectasis that precipitated the acute chest. There is no sign yet of a stroke or a sequestration, but the boy is at risk of both, and the assessment searches for the focal deficit and the enlarging spleen. The interpretation is that the boy has moved from a manageable pain crisis to a potentially fatal complication, and the response must match the change. ^[1]