Postsepsis bradycardia in children with leukemia

Area of Science:

• Pediatric critical care medicine
• Hematology-oncology
• Infectious diseases

Background:

• Sinus bradycardia was observed in children with hematologic malignancies recovering from sepsis.
• The etiology of this postsepsis bradycardia syndrome was not well-defined.

Purpose of the Study:

• To define the clinical characteristics of postsepsis bradycardia in pediatric oncology patients.
• To investigate potential causes and predisposing factors for this condition.

Main Methods:

• Retrospective chart review of pediatric intensive care unit (ICU) admissions.
• Identified children with persistent bradycardia (heart rate <5th percentile for age for >1 hour) after sepsis.
• Analyzed patient demographics, diagnoses, blood cultures, and clinical course.

Main Results:

• Seven children with acute leukemia developed postsepsis bradycardia.
• Common pathogens included Streptococcus mitis, Escherichia coli, and Klebsiella pneumoniae.
• Bradycardia resolved spontaneously within 24-72 hours without specific treatment; echocardiograms and ECGs were normal.

Conclusions:

• Postsepsis bradycardia in this cohort may stem from altered beta-adrenergic receptor function or unique humoral factors.
• Acute leukemia and prior sepsis treatment might predispose patients to this syndrome.
• The bradycardia was clinically insignificant, obviating the need for invasive diagnostic or therapeutic measures.