Document Detail

Effects of acute on chronic respiratory failure on hypercapnia and 3-month survival.
MedLine Citation:
PMID:  16162708     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: There is a lack of information on respiratory function and mechanics after COPD exacerbations. STUDY OBJECTIVES: To find their role in short-term survival and occurrence of chronic hypercapnia after these events. PATIENTS AND INTERVENTIONS: Seventy-three COPD patients recovering from a recent severe exacerbation underwent evaluation of breathing pattern, breathing mechanics, lung function, and arterial blood gas levels at the time of discharge from a respiratory ICU (RICU). RESULTS: The 3-month mortality rate after RICU discharge was 11%. The percent of ideal body weight (%IBW) [R = 6.04; p = 0.01] and occlusion pressure (R = 5.41; p = 0.02) provided significant distinction between deceased patients and survivors; the final discriminant equation showed that %IBW was able to predict patient death or survival with an accuracy of 90%. With decreasing order of power, the ratio of inspiratory time to total breathing cycle time (Ti/Ttot) [R = 8.87; p = 0.003], pressure-time product of the inspiratory muscles (R = 7.12; p = 0.009), maximal esophageal pressure (R = 6.00; p = 0.01), esophageal pressure (R = 5.50; p = 0.02), Pa(O2)/fraction of inspired oxygen (R = 4.72; p = 0.03), and pressure time index (PTI) [R = 4.57; p = 0.03] provided a significant distinction between hypercapnia and normocapnia at discharge. The discriminant equation, including Ti/Ttot and PTI, could correctly separate hypercapnic or normocapnic patients with an accuracy of 76%. CONCLUSIONS: In COPD patients who are recovering from a severe exacerbation, hypercapnia is strongly related to inspiratory muscle work, strength, and breathing pattern; and only body weight predicts short-term survival.
Michele Vitacca; Luca Bianchi; Luca Barbano; Mara Ziliani; Nicolino Ambrosino
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chest     Volume:  128     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-15     Completed Date:  2005-11-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1209-15     Citation Subset:  AIM; IM    
Respiratory Department, Salvatore Maugeri Foundation, Istituto di Ricovero e Cura a Carattere Scientifico, Scientific Institute of Gussago, Via Pinidolo 23, 25064 Gussago (BS), Italy.
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MeSH Terms
Blood Gas Analysis
Body Weight
Chronic Disease
Hypercapnia / etiology,  mortality*,  physiopathology
Predictive Value of Tests
Prospective Studies
Respiratory Function Tests
Respiratory Insufficiency / complications,  mortality*,  physiopathology
Respiratory Mechanics / physiology*
Survival Analysis

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