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Difficulty: MediumPediatric Hematology and Oncology

A 99-year-old boy with a known history of sickle cell anemia (HbSS) is brought to the emergency department by his parents. 11 hour ago, he suddenly developed slurred speech and weakness in his right arm and leg. On presentation, his temperature is 37.1∘C37.1^\circ\text{C} (98.8∘F98.8^\circ\text{F}), blood pressure is 110/70 mmHg110/70\text{ mmHg}, heart rate is 105/min105/\text{min}, and respiratory rate is 18/min18/\text{min}. Physical examination reveals an alert child with a right-sided facial droop and dense right-sided hemiparesis. Arrange the following management steps in the most appropriate chronological sequence for this patient.

  1. 1Perform initial stabilization and evaluate airway, breathing, and circulation
  2. 2Obtain an urgent non-contrast computed tomography (CT) scan of the head
  3. 3Perform an emergent exchange blood transfusion
  4. 4Initiate a chronic monthly blood transfusion program

Answer

The correct sequence is: initial stabilization, followed by a non-contrast head CT, then an emergent exchange transfusion, and finally the initiation of a chronic monthly transfusion program.
The patient is experiencing an acute ischemic stroke, a severe neurological emergency associated with sickle cell disease. The immediate priority is to ensure the airway is patent and hemodynamics are stable. Once the ABCs are secured, a non-contrast CT of the head is the fastest and most appropriate test to exclude an intracranial hemorrhage. After hemorrhage is ruled out, the definitive treatment is an emergent exchange blood transfusion. This procedure physically removes the sickled red blood cells and replaces them with healthy red blood cells, rapidly decreasing the proportion of hemoglobin S to less than 30%30\% without causing hyperviscosity. Finally, because the risk of recurrent stroke is extremely high in these patients without secondary prophylaxis, they must be placed on a chronic monthly transfusion program to continually suppress endogenous sickled red blood cell production.

Step-by-Step Solution

1
Recognize the clinical presentation of an acute ischemic stroke in a patient with sickle cell disease.
The acute onset of focal neurologic deficits (slurred speech, hemiparesis) in a child with HbSS strongly suggests an acute stroke.
Sickle cell disease causes sickling of red blood cells leading to vaso-occlusion, and the cerebral vasculature is a common site, leading to ischemic infarction.
2
Prioritize initial emergency management steps.
The first step is stabilization (ABCs), followed immediately by ruling out hemorrhage using a non-contrast head CT.
Stabilization ensures survival, and a head CT dictates whether the stroke is ischemic or hemorrhagic, which critically alters subsequent management.
3
Determine the definitive acute and long-term therapies.
For an ischemic stroke, emergent exchange transfusion is required acutely, followed by chronic transfusions long-term.
Exchange transfusion rapidly removes sickled cells and replaces them with normal RBCs to lower HbS to less than 30%30\%, while chronic transfusions prevent recurrence.

Key Concept

The acute management of ischemic stroke in sickle cell disease requires emergent exchange blood transfusion to rapidly lower Hemoglobin S levels, followed by long-term chronic transfusion therapy to prevent recurrence.
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Topics

Pediatric Hematology and Oncology

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