Clinical diagnostic accuracy of respiratory failure in critically ill hematopoietic stem cell transplant patients.

Rationale: Acute respiratory failure (ARF) is a frequent complication following hematopoietic cell transplantation (HCT). We aimed to characterize the etiologies of ARF in patients who died in the intensive care unit following HCT based on autopsy findings. We then evaluated agreement between the clinical and pathologic diagnosis.
Methods: We performed a chart review of all HCT patients who died and underwent autopsy in our ICU between 2006-2016. We evaluated the presumed clinical diagnosis and confidence in the diagnosis by chart review, the pathologic diagnosis on autopsy, and whether the clinical-pathologic diagnoses were concordant. When there was discordance, we evaluated whether knowledge of the pathology could have changed management.
Results: Thirteen patients underwent autopsy after dying. Infection was the presumed cause in 11/13 cases. The clinical and pathologic diagnoses were concordant in 6/13(46%). In the seven discordant cases (all clinically diagnosed as infection), autopsy revealed two non-infectious inflammatory causes, one post-transplant lymphoproliferative disorder, and three non-bacterial infectious etiology. Pathologic findings may have changed management in 7/13(54%) cases.
Conclusions: In a subset of HCT-recipients who died from respiratory failure, discordance was frequent between clinical and pathologic diagnoses. The risks and benefits of obtaining tissue to improve our diagnostic accuracy requires further evaluation.
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