Prolonged mechanical ventilation alters diaphragmatic structure and function.

Abstract:

OBJECTIVE:To review current knowledge about the impact of prolonged mechanical ventilation on diaphragmatic function and biology. MEASUREMENTS:Systematic literature review. CONCLUSIONS:Prolonged mechanical ventilation can promote diaphragmatic atrophy and contractile dysfunction. As few as 18 hrs of mechanical ventilation results in diaphragmatic atrophy in both laboratory animals and humans. Prolonged mechanical ventilation is also associated with diaphragmatic contractile dysfunction. Studies using animal models revealed that mechanical ventilation-induced diaphragmatic atrophy is due to increased diaphragmatic protein breakdown and decreased protein synthesis. Recent investigations have identified calpain, caspase-3, and the ubiquitin-proteasome system as key proteases that contribute to mechanical ventilation-induced diaphragmatic proteolysis. The scientific challenge for the future is to delineate the mechanical ventilation-induced signaling pathways that activate these proteases and depress protein synthesis in the diaphragm. Future investigations that define the signaling mechanisms responsible for mechanical ventilation-induced diaphragmatic weakness will provide the knowledge required for the development of new medicines that can maintain diaphragmatic mass and function during prolonged mechanical ventilation.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Powers SK,Kavazis AN,Levine S

doi

10.1097/CCM.0b013e3181b6e760

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

S347-53

issue

10 Suppl

eissn

0090-3493

issn

1530-0293

pii

00003246-200910001-00009

journal_volume

37

pub_type

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