Document Detail


Positive end-expiratory pressure and response to inhaled nitric oxide: changing nonresponders to responders.
MedLine Citation:
PMID:  10776429     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Inhaled nitric oxide (INO) has been shown to improve oxygenation in two thirds of patients with acute respiratory distress syndrome (ARDS). Failure to respond to INO is multifactorial. We hypothesized that the addition of positive end expiratory pressure (PEEP) might modify the response to INO in patients who had previously failed to respond to INO. METHODS: Patients with ARDS who failed to respond to INO at 1 ppm (PaO2 increase of < 20%) were selected. Each patient underwent a PEEP trial using an improvement in static lung compliance as the end point. One hour after the new PEEP level was reached, hemodynamic and blood gas values were obtained. INO was then reinstituted at 1 ppm, and hemodynamic and blood gas variables were obtained 1 hour later. RESULTS: Six of nine patients demonstrated an increase in PaO2/FIO2 (161 +/- 27 to 186 +/- 29) with a mean increase in PEEP of 3.7 cm H2O. Each patient responding to PEEP further improved PaO2/FIO2 (186 +/- 29 to 223 +/- 36) with INO at 1 ppm. The three patients who failed to improve after the PEEP increase also failed to respond to a second trial of INO. There were no changes in cardiac output or systemic vascular resistance. Pulmonary artery pressures decreased slightly (39 +/- 5 vs 38 +/- 7 vs 35 +/- 9 mm Hg). Pulmonary vascular resistance decreased significantly after reintroduction of INO (298 +/- 131 vs 310 +/- 122 vs 249 +/- 105 dynes/sec/cm-5) in patients who responded positively. CONCLUSIONS: The response of ARDS patients to INO can be improved if optimum alveolar recruitment is achieved by the addition of PEEP. PEEP and INO have a synergistic effect on PaO2/FIO2. Patients who fail to respond to INO may benefit from an optimum PEEP trial.
Authors:
J A Johannigman; K Davis; R S Campbell; F A Luchette; S B Frame; R D Branson
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Surgery     Volume:  127     ISSN:  0039-6060     ISO Abbreviation:  Surgery     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-05-08     Completed Date:  2000-05-08     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0417347     Medline TA:  Surgery     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  390-4     Citation Subset:  AIM; IM    
Affiliation:
Department of Surgery, University of Cincinnati Medical Center, OH 45267-0558, USA.
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MeSH Terms
Descriptor/Qualifier:
Administration, Inhalation
Adult
Aged
Blood Pressure
Bronchodilator Agents / administration & dosage,  therapeutic use*
Combined Modality Therapy
Female
Humans
Lung Compliance
Male
Middle Aged
Nitric Oxide / administration & dosage,  therapeutic use*
Oxygen / blood
Positive-Pressure Respiration*
Pulmonary Artery / physiopathology
Respiratory Distress Syndrome, Adult / etiology,  physiopathology,  therapy*
Vascular Resistance
Chemical
Reg. No./Substance:
0/Bronchodilator Agents; 10102-43-9/Nitric Oxide; 7782-44-7/Oxygen
Comments/Corrections
Comment In:
Surgery. 2000 Nov;128(5):871-2   [PMID:  11056458 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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