Document Detail


Influence of cardiomegaly on disordered breathing during exercise in chronic heart failure.
MedLine Citation:
PMID:  20952768     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIMS: Heart failure (HF) patients breathe with a rapid shallow pattern during exercise. This study examined the relationship between cardiac size and tachypnoeic breathing in HF patients during exercise.
METHODS AND RESULTS: Thirty-seven HF patients [age = 55 ± 13 years, ejection fraction (EF) = 27 ± 10%, New York Heart Association (NYHA) class = 2.3 ± 1.2] and 42 controls (CTL) (age = 56 ± 14 years, EF = 63 ± 8%) were recruited. Participants underwent maximal exercise testing, pulmonary function testing, and chest radiography for calculation of total thoracic cavity volume (TTCV), diaphragm, heart, and lung volumes. Heart failure patients were divided into two groups: Group A = cardiac volume < median (n = 18) and Group B = cardiac volume ≥ median of the HF patients (n = 19). There was no difference between groups for TTCV (CTL = 8203 ± 1489 vs. Group A = 8694 ± 1249 vs. Group B = 8195 ± 1823 cm(3)). Cardiac volume was different between groups for both absolute (CTL = 630 ± 181 vs. Group A = 894 ± 186 vs. Group B = 1401 ± 382 cm(3), P< 0.001 for all comparisons) and %TTCV (CTL = 8 ± 2 vs. Group A = 10 ± 1 vs. Group A = 18 ± 5%, P< 0.001 for all comparisons). Similarly, total lung volume as a %TTCV was significantly different among the groups (CTL = 70 ± 4 vs. Group A = 65 ± 5 vs. Group A = 58 ± 7%, P< 0.01 for all comparisons). In HF patients, there was a trend (P = 0.10) towards an independent association between cardiac size and tidal volume (V(T)) at 75% of VO(2) peak whereas this relationship was statistically significant at VO(2) peak (P = 0.02) as patients with larger cardiac size had reduced V(T).
CONCLUSION: This study demonstrates the close relationship between cardiac size and breathing pattern during exercise in HF patients. These results suggest cardiac size may pose a significant constraint on the lungs during exercise and may contribute to tachypnoeic breathing.
Authors:
Thomas P Olson; Bruce D Johnson
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2010-10-16
Journal Detail:
Title:  European journal of heart failure     Volume:  13     ISSN:  1879-0844     ISO Abbreviation:  Eur. J. Heart Fail.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-02-21     Completed Date:  2011-06-23     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  100887595     Medline TA:  Eur J Heart Fail     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  311-8     Citation Subset:  IM    
Affiliation:
Division of Cardiovascular Diseases, Department of Internal Medicine, Joseph 4-221, Mayo Clinic and Foundation, Rochester, MN 55905, USA. olson.thomas2@mayo.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Cardiomegaly / complications,  physiopathology
Case-Control Studies
Chronic Disease
Exercise / physiology*
Exercise Test
Female
Heart Failure / complications,  physiopathology*
Humans
Linear Models
Male
Middle Aged
Respiration*
Respiratory Function Tests
Grant Support
ID/Acronym/Agency:
1KL2RR024151/RR/NCRR NIH HHS; HL71478/HL/NHLBI NIH HHS
Comments/Corrections

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