ABSTRACT
Pulmonary infections are second in importance only to septicemia as a cause of infectious
morbidity and mortality in patients with hematological disorders. The differential
diagnosis of the pneumonitis syndrome includes not only infection but also a multitude
of noninfectious causes. In addition, the diagnosis may be difficult, owing to the
subtlety of the clinical signs as a consequence of the impaired inflammatory response.
Radiographic findings are often nonspecific, and invasive procedures and microbiological
exams are required to establish the cause of pulmonary disease and to choose a specific
therapy. However, invasive diagnostic procedures are often precluded by the poor general
conditions and (particularly in acute leukemia patients) by concurrent thrombocytopenia.
The approach to all infectious complications, including those of the lower respiratory
tract, in immunocompromised patients with hematological diseases, is based on aggressive
prevention strategies and the empirical administration of broad-spectrum antimicrobials
eventually followed by a clinically or microbiologically guided treatment modification.
With regard to the antimicrobial treatment, given the variety of infectious and noninfectious
causes of pulmonary infiltrates in patients with hematological diseases, the diversity
of the underlying immunocompromised state, and the spectrum of clinical findings,
no single general therapeutic algorithm can be applied.
KEYWORDS
Pneumonia - neutropenia - leukemia - “hematopoietic stem cell transplant”
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Pietro MartinoM.D.
Dipartimento di Biotecnologie Cellulari ed Ematologia, University “La Sapienza”
Via Benevento 6, 00161, Rome, Italy
Email: martino@bce.med.uniroma1.it