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Abstract: Poster Presentations |

Lung Sound Patterns in Common Pulmonary Disorders FREE TO VIEW

Raymond L. Murphy, MD
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Brigham and Womens/ Faulkner Hospitals, Boston, MA


Chest


Chest. 2003;124(4_MeetingAbstracts):190S. doi:10.1378/chest.124.4_MeetingAbstracts.190S-a
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Abstract

PURPOSE:  Lung sounds reflect underlying pulmonary pathophysiology. In previous work we noted consistent pattern differences in 285 subjects with a variety of common pulmonary disorder. Normals had very low wheeze and crackle rates. Wheeze rates were high in bronchial asthma. They were not uncommon in congestive heart failure. The highest crackle rates were seen in interstitial pulmonary fibrosis. Our purpose in this study is to determine if the patterns of abnormality seen in this larger population were similar to our previous observations.

METHODS:  615 patients were studied with a Stethograph (STG) computer which automatically analyzes wheezes, rhonchi and crackles (Stethographics, Inc, Model STG1602).

RESULTS:  Table 1Table 1 –patients positive for abnormal sounds and average rates*CHF (n=71) % (rate)Asthma (n=51) % (rate)Pn (n=99) % (rate)IPF (n=19) % (rate)COPD (n=92) % (rate)Normals (n=283) % (rate)Wheeze inspiration11(4)41(11)16(5)0(0)18(4)1(0)Wheeze expiration15(6)49(25)2(7)0(0)33(15)1(0)rhonchi inspiration10(4)6(4)16(5)0(0)12(3)2(0)rhonchi expiration15(3)14(7)18(7)0(0)13(7)1(0)crackles inspiration68(5)35(2)70(6)100(24)58(4)12(1)crackles expiration21(2)18(2)53(3)58(7)28(2)2(0)*

Wheeze and rhonchi-are calculated percent per breath they occupy; crackles-number per breath.

shows percent patients positive for crackles and wheezes in each category. These findings are similar to previous observations. Squawks were found in 15% of patients with pneumonia, and were absent or rare in the other conditions. They are a specific but not sensitive sign of lower respiratory infection.

CONCLUSION:  We conclude as we did in previous work that there are consistent differences in the acoustical patterns in a variety of common lung disorders that can be detected with a computerized lung sound analyzer.CLINICAL IMPLICATION: This has been the promise of aiding clinicians in diagnosis and monitoring a variety of common pulmonary disorders.

DISCLOSURE:  Dr. Murphy, and Dr. Vyshedskiy have a financial interest in Stethographics. Supported in part by a grant from Stethographics, Inc.

Wednesday, October 29, 2003

12:30 PM - 2:00 PM


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