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Area of Science:

  • Pediatrics
  • Infectious Diseases
  • Critical Care Medicine

Background:

  • Malignant pertussis, a severe form of Bordetella pertussis infection, presents with multi-organ failure and high mortality.
  • Hyperleukocytosis is a critical feature of malignant pertussis, demanding immediate intervention.
  • Whole blood exchange transfusion is a traditional leukoreduction method but carries significant risks.

Purpose of the Study:

  • To evaluate the clinical experience of using hydroxyurea as a pharmacological alternative to whole blood exchange for leukoreduction in infants with malignant pertussis.
  • To assess the efficacy and safety of hydroxyurea in managing hyperleukocytosis in this patient population.

Main Methods:

  • A prospective case series was conducted in a French pediatric intensive care unit (PICU).
  • Critically ill infants (n=27) with severe pertussis were analyzed.
  • Treatment strategies included hydroxyurea therapy or whole blood exchange transfusion for managing hyperleukocytosis.

Main Results:

  • Twelve infants had malignant pertussis; seven received hydroxyurea and five underwent whole blood exchange.
  • Hydroxyurea successfully reduced leukocyte counts within 7 days.
  • Overall mortality was 25% (3 of 12 infants), with hydroxyurea demonstrating effective leukoreduction.

Conclusions:

  • Hydroxyurea serves as an effective alternative therapy for managing hyperleukocytosis in infants with malignant pertussis.
  • This pharmacological approach offers a potentially safer option compared to whole blood exchange transfusion.
  • The study highlights hydroxyurea's role in addressing a critical complication of severe pertussis infections.