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Related Experiment Videos

Negative pressure pulmonary hemorrhage.

D R Schwartz1, A Maroo, A Malhotra

  • 1Pulmonary and Critical Care Unit, Massachusetts General Hospital, Boston 02114-2696, USA. schwartz@massmed.org

Chest
|April 20, 1999
PubMed
Summary

Negative pressure pulmonary edema, following airway obstruction, can cause diffuse alveolar hemorrhage. This rare complication may result from stress failure of the alveolar-capillary membrane.

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Area of Science:

  • Pulmonary Medicine
  • Critical Care Medicine
  • Pathophysiology

Background:

  • Negative pressure pulmonary edema (NPPE) is a known complication of acute upper airway obstruction (UAO).
  • The pathophysiology of NPPE involves increased negative intrathoracic pressure leading to fluid transudation into the lungs.
  • Diffuse alveolar hemorrhage (DAH) is a distinct clinical entity characterized by bleeding into the alveolar spaces.

Observation:

  • This report describes a case of NPPE complicated by diffuse alveolar hemorrhage.
  • The patient experienced significant negative intrathoracic pressures due to upper airway obstruction.
  • Pulmonary hemorrhage was identified as a consequence of the NPPE event.

Findings:

  • Diffuse alveolar hemorrhage has not been previously reported as a complication of UAO or NPPE.
  • The proposed etiology for this case of NPPE with DAH is stress failure.
  • Stress failure suggests mechanical disruption of the alveolar-capillary membrane due to extreme pressure gradients.

Implications:

  • This finding expands the spectrum of potential complications associated with UAO and NPPE.
  • Recognizing stress failure as a mechanism is crucial for understanding NPPE-induced DAH.
  • Further research is needed to elucidate the precise mechanisms and incidence of NPPE-related DAH.

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