Severe Thrombocytopenia in the NICU

Area of Science:

• Neonatal Medicine
• Hematology
• Pediatric Critical Care

Background:

• Severe thrombocytopenia (platelets ≤ 50,000/microL) in Neonatal Intensive Care Unit (NICU) patients presents significant clinical challenges.
• Limited research has exclusively focused on NICU populations with extremely low platelet counts.

Purpose of the Study:

• To investigate the prevalence, characteristics, and outcomes of severe thrombocytopenia in NICU patients.
• To determine the relationship between platelet counts, bleeding events, and mortality in this specific patient group.

Main Methods:

• Retrospective identification of all patients with severe thrombocytopenia admitted to Intermountain Healthcare level III NICUs between 2003 and 2007.
• Analysis of patient demographics, platelet counts, bleeding occurrences (cutaneous, pulmonary, gastrointestinal, intraventricular), causes of thrombocytopenia, platelet transfusions, and mortality.

Main Results:

• Severe thrombocytopenia occurred in 2.4% of 11,281 NICU admissions, with prevalence inversely related to birth weight.
• Acquired consumptive thrombocytopenias were the most frequent cause; cutaneous bleeding was more common with counts <20,000/microL.
• Mortality did not correlate with the lowest platelet count but was proportionate to the number of platelet transfusions received; no deaths were attributed to exsanguination.

Conclusions:

• The incidence of severe thrombocytopenia in NICU settings is inversely proportional to birth weight, with acquired consumptive types predominating.
• Very low platelet counts may contribute to cutaneous bleeding, but pulmonary, gastrointestinal, and intraventricular hemorrhages appear multifactorial and less influenced by platelet levels.
• The number of platelet transfusions, rather than the nadir platelet count, is a significant predictor of mortality in NICU patients with severe thrombocytopenia.