| Effects of acute on chronic respiratory failure on hypercapnia and 3-month survival. | |
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MedLine Citation:
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PMID: 16162708 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Michele Vitacca; Luca Bianchi; Luca Barbano; Mara Ziliani; Nicolino Ambrosino |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Chest Volume: 128 ISSN: 0012-3692 ISO Abbreviation: Chest Publication Date: 2005 Sep |
Date Detail:
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Created Date: 2005-09-15 Completed Date: 2005-11-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0231335 Medline TA: Chest Country: United States |
Other Details:
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Languages: eng Pagination: 1209-15 Citation Subset: AIM; IM |
Affiliation:
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Respiratory Department, Salvatore Maugeri Foundation, Istituto di Ricovero e Cura a Carattere Scientifico, Scientific Institute of Gussago, Via Pinidolo 23, 25064 Gussago (BS), Italy. mvitacca@fsm.it |
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Blood Gas Analysis Body Weight Chronic Disease Humans Hypercapnia / etiology, mortality*, physiopathology Predictive Value of Tests Prognosis Prospective Studies Recurrence Respiratory Function Tests Respiratory Insufficiency / complications, mortality*, physiopathology Respiratory Mechanics / physiology* Survival Analysis |
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