Measurement of respiratory acoustic signals. Effect of microphone air cavity width, shape, and venting.

Abstract:

STUDY OBJECTIVE:We have previously investigated the effects of microphone type and coupler air chamber depth on lung sound characteristics. We now report the results of experiments exploring the effects of air chamber width, shape, and venting on lung sounds. DESIGN:We used a single electret microphone with a variety of plastic couplers. The couplers were identical except for the diameter and shape of the air chamber. We used cylindrical chambers of 5, 10, and 15 mm in diameter at the skin and conical chambers of 8, 10, and 15 mm in diameter. We compared the inspiratory lung sound spectra obtained using each of the couplers. We also examined the tendency of various needle vents to transmit ambient noise into the microphone chamber. SETTING:Anechoic chamber. MEASUREMENTS AND RESULTS:The shape and diameter had little important effect on the lung sound spectrum below 500 Hz. From approximately 500 to 1,500 Hz, the 5-mm diameter couplers showed slightly less sensitivity than the 10- and 15-mm diameter couplers. All conical couplers provided approximately 5 to 10 decibel more sensitivity than the cylindrical couplers. All vents allowed some ambient noise to enter the chamber but the amount was trivial using the narrowest, longest vent. CONCLUSIONS:These data suggest that the optimal electret microphone coupler chamber for lung sound acquisition should be conical in shape, between 10 and 15 mm in diameter at the skin, and either not vented or vented with a tube no wider than 23-g or shorter than 20 mm.

journal_name

Chest

journal_title

Chest

authors

Kraman SS,Wodicka GR,Oh Y,Pasterkamp H

doi

10.1378/chest.108.4.1004

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

1004-8

issue

4

eissn

0012-3692

issn

1931-3543

pii

S0012-3692(15)44743-9

journal_volume

108

pub_type

杂志文章

相关文献

CHEST文献大全
  • Congenital aneurysm of the left sinus of Valsalva. Report of a patient with 19-year survival without surgery.

    abstract::An unruptured aneurysm of the left sinus of Valsalva was diagnosed by angiography in a 16-year-old male subject 19 years ago. A recent repeated angiographic study documented no change in the aneurysm over the 19-year interval, and the patient has remained asymptomatic. We are aware of no other long-term follow-up repo...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.90.1.143

    authors: Martin LW,Hsu I,Schwartz H,Wasserman AG

    更新日期:1986-07-01 00:00:00

  • Diagnosis of Pneumocystis carinii infection in HIV-seropositive patients by identification of P carinii in pleural fluid.

    abstract::Pneumocystis carinii pneumonia (PCP) is the most common pulmonary complication of AIDS and is typically diagnosed by the identification of P carinii organisms in sputum, bronchoalveolar lavage fluid, or tissue obtained with transbronchial biopsy. We describe two HIV-seropositive patients with pleural effusions in whom...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.103.6.1890

    authors: Schaumberg TH,Schnapp LM,Taylor KG,Golden JA

    更新日期:1993-06-01 00:00:00

  • Positional dyspnea and oxygen desaturation related to carcinoma of the lung. Up with the good lung.

    abstract::Body position can lead to respiratory symptoms and affect gas exchange in disease states. We describe a patient with carcinoma of the left lung in whom dyspnea and oxygen desaturation developed in the right lateral position only. Fiberoptic bronchoscopic study demonstrated a tumor mass protruding into the left main-st...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.83.5.826

    authors: Mahler DA,Snyder PE,Virgulto JA,Loke J

    更新日期:1983-05-01 00:00:00

  • Clinical and radiographic manifestations of uncommon pulmonary nontuberculous mycobacterial disease in AIDS patients.

    abstract:STUDY OBJECTIVE:To determine the clinical and radiographic findings of nontuberculous mycobacteria (NTM) other than Mycobacterium avium complex (MAC) and Mycobacterium kansasii in AIDS compared with non-AIDS patients. DESIGN:A retrospective chart review of all patients in whom NTM other than MAC complex and M kansasii...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.114.1.138

    authors: El-Solh AA,Nopper J,Abdul-Khoudoud MR,Sherif SM,Aquilina AT,Grant BJ

    更新日期:1998-07-01 00:00:00

  • Nonfebrile mitral valve endocarditis due to Neisseria subflava.

    abstract::Native valve endocarditis normally presents with fever and only later in its course demonstrates dysfunction of the affected valve. We describe a case of endocarditis due to Neisseria subflava, a Gram-negative diplococcal saprophyte of the oral cavity, which was unsuspected clinically and found unexpectedly during a m...

    journal_title:Chest

    pub_type: 杂志文章,评审

    doi:10.1378/chest.109.1.280

    authors: Amsel BJ,Moulijn AC

    更新日期:1996-01-01 00:00:00

  • Cannonball-Like Lung Nodules in a Patient With a Colorectal Tumor.

    abstract:CASE PRESENTATION:A 72-year-old man underwent endoscopic resection of a 10-mm polypoid sessile lesion of the rectum. Histologic examination found a well-differentiated, low-grade (G1), neuroendocrine tumor. A thoracoabdominal CT scan was performed for staging purposes. The chest CT scan revealed a so-called cannonball-...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1016/j.chest.2019.05.007

    authors: Scamporlino A,Mengoli MC,Calabrese O,Della Casa G,Aramini B,Spallanzani A,Morandi U,Stefani A

    更新日期:2019-10-01 00:00:00

  • Elevated basic fibroblast growth factor levels in patients with pulmonary arterial hypertension.

    abstract:STUDY OBJECTIVES:Cellular growth in the vascular wall, including endothelial and smooth-muscle cell proliferation, is recognized as a component of the obstructive vasculopathy observed in the small vessels of the lungs in pulmonary arterial hypertension (PAH). We hypothesized that angiogenic growth factors may have a r...

    journal_title:Chest

    pub_type: 杂志文章,多中心研究

    doi:10.1378/chest.126.4.1255

    authors: Benisty JI,McLaughlin VV,Landzberg MJ,Rich JD,Newburger JW,Rich S,Folkman J

    更新日期:2004-10-01 00:00:00

  • Echocardiographic findings in a patient with Candida endocarditis of the aortic valve.

    abstract::The echocardiographic appearance of fungal endocarditis of the aortic valve is described in a patient who subsequently died from this disease. In addition, the progressive growth of the vegetation on serial echocardiograms was recorded, and premature closure of the mitral valve was absent, notwithstanding perforation ...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.70.2.300

    authors: Arvan S,Cagin N,Levitt B,Kleid JJ

    更新日期:1976-08-01 00:00:00

  • The clinical use of lung MRI in cystic fibrosis: what, now, how?

    abstract::To assess airway and lung parenchymal damage non-invasively in cystic fibrosis (CF), chest MRI has been historically out of the scope of routine clinical imaging due to technical difficulties such as the low proton density and respiratory and cardiac motion. However, technological breakthroughs have recently emerged t...

    journal_title:Chest

    pub_type: 杂志文章,评审

    doi:10.1016/j.chest.2020.12.008

    authors: Dournes G,Walkup LL,Benlala I,Willmering MM,Macey J,Bui S,Laurent F,Woods JC

    更新日期:2020-12-17 00:00:00

  • Minimal effect of alcohol ingestion on breathing during the sleep of postmenopausal women.

    abstract::Eighteen asymptomatic postmenopausal women volunteered to ingest 2 ml of 100-proof vodka per kg of body weight in orange juice on one night and a placebo on another. Overnight sleep monitoring was performed immediately thereafter. Alcohol ingestion caused reduction in total sleep time from 329 to 281 minutes and a dec...

    journal_title:Chest

    pub_type: 临床试验,杂志文章

    doi:10.1378/chest.88.2.181

    authors: Block AJ,Hellard DW,Slayton PC

    更新日期:1985-08-01 00:00:00

  • Angiographic morphologic features of infarct-related arteries and timely reperfusion in acute myocardial infarction: predictors of slow-flow and no-reflow phenomenon.

    abstract:BACKGROUND:Growing evidence suggests that no-reflow reperfusion after direct percutaneous coronary intervention (d-PCI) is associated with an unfavorable clinical outcome. The purpose of this study was to evaluate whether prerevascularization angiographic morphologic features of infarct-related arteries (IRAs) and time...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.122.4.1322

    authors: Yip HK,Chen MC,Chang HW,Hang CL,Hsieh YK,Fang CY,Wu CJ

    更新日期:2002-10-01 00:00:00

  • The effect on expiratory flow rates of smoking three cigarettes in rapid succession.

    abstract::The effect of smoking three cigarettes in rapid succession on maximal and partial expiratory flow rates was studied in ten healthy smokers. The mean decrease in maximal midexpiratory flow and partial midexpiratory and end-expiratory flow was statistically significant. The response was maximal after the first cigarette...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.72.5.610

    authors: Hamosh P,Taveira Da Silva AM

    更新日期:1977-11-01 00:00:00

  • Histologic assessment of tumor-associated CD45(+) cell numbers is an independent predictor of prognosis in small cell lung cancer.

    abstract:BACKGROUND:Small cell lung carcinoma (SCLC) continues to have a poor prognosis, with a 2-year survival of < 20%. Studies have suggested that SCLC may affect the immune system to allow it to evade immunologic responses. We hypothesized that any such effect would be characterized by a decrease in the lymphoid cells assoc...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.12-0681

    authors: Wang W,Hodkinson P,McLaren F,Mackean MJ,Williams L,Howie SEM,Wallace WAH,Sethi T

    更新日期:2013-01-01 00:00:00

  • Factitious methemoglobinemia caused by hyperlipemia.

    abstract::Hyperlipemia in an acyanotic patient with diabetic ketoacidosis, alcoholism, and pancreatitis produced a falsely elevated concentration of methemoglobin (19 percent) and a lower-than-expected oxygen saturation measured with an automated spectrophotometer (IL-282 CO-Oximeter). In addition, there was a "normal" hemoglob...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.86.1.84

    authors: Spurzem JR,Bonekat HW,Shigeoka JW

    更新日期:1984-07-01 00:00:00

  • Evaluating prethrombotic state in lung cancer using molecular markers.

    abstract::Clotting abnormalities are well-recognized complications that occur with high frequency in patients suffering from underlying malignant diseases. New and highly sensitive molecular markers of hemostasis, thrombin-antithrombin III complex (TAT III), D-dimer fragments (DD), and plasmin-alpha 2-antiplasmin complex (PIC) ...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.103.1.196

    authors: Gabazza EC,Taguchi O,Yamakami T,Machishi M,Ibata H,Suzuki S

    更新日期:1993-01-01 00:00:00

  • Continuous Fick cardiac output measurement during exercise by monitoring of mixed venous oxygen saturation and oxygen uptake.

    abstract::To determine whether continuous Fick cardiac output measurement is applicable to exercise testing, cardiac output data obtained by the continuous Fick method (Qcf) during exercise were compared with data obtained by the thermodilution method (Qth). Seventeen patients with old myocardial infarction underwent a 1-min or...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.104.2.419

    authors: Nakanishi N,Yoshioka T,Okano Y,Nishimura T

    更新日期:1993-08-01 00:00:00

  • Detection of right-to-left shunt with radionuclide angiocardiography in refractory hypoxemia.

    abstract::A significant right-to-left shunt at the atrial level was diagnosed by radionuclide angiocardiographic examination in a patient with hypoxemia whose perfusion scan showed no pulmonary uptake. The shunt occurred through a patent foramen ovale due to increased right ventricular afterload, subsequently confirmed at autop...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.88.5.784

    authors: Salimi Z,Thomasson J,Vas W,Salimi A

    更新日期:1985-11-01 00:00:00

  • Acute lung injury outside of the ICU: incidence in respiratory isolation on a general ward.

    abstract:BACKGROUND:Epidemiologic investigations of acute lung injury (ALI) and ARDS have focused on mechanically ventilated patients in ICUs, and have reported high mortality rates. We sought to determine the incidence and lethality of these syndromes in the respiratory isolation areas of general wards, a non-ICU setting that ...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.08-0280

    authors: Quartin AA,Campos MA,Maldonado DA,Ashkin D,Cely CM,Schein RMH

    更新日期:2009-02-01 00:00:00

  • O2 uptake kinetics in response to exercise. A measure of tissue anaerobiosis in heart failure.

    abstract::Oxygen uptake (VO2) reflects the rate of aerobic regeneration of high-energy phosphate compounds (primarily adenosine triphosphate [ATP]). Since lactate increase is thought to result from an inadequate rate of aerobic ATP regeneration, it might be expected that lactate increase would be associated with a delayed attai...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.103.3.735

    authors: Zhang YY,Wasserman K,Sietsema KE,Ben-Dov I,Barstow TJ,Mizumoto G,Sullivan CS

    更新日期:1993-03-01 00:00:00

  • Depression is more common in girls with nonatopic asthma.

    abstract:BACKGROUND:Asthma may increase the risk of comorbid depressive disorders in children. Children suffering from asthma or depression are more often overweight. We examined whether depression was more likely in children with atopic and nonatopic asthma, independent of abdominal adiposity. METHODS:A cross-sectional analys...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.11-0219

    authors: Bahreinian S,Ball GDC,Colman I,Becker AB,Kozyrskyj AL

    更新日期:2011-11-01 00:00:00

  • Small airways obstruction syndrome.

    abstract:STUDY OBJECTIVES:To clarify the significance of a functional lung pattern characterized by a decreased vital capacity (VC) and an increased residual volume (RV), but with a normal FEV1/VC ratio. SETTING:A university teaching hospital. SUBJECTS:Patients with bronchial asthma, pulmonary emphysema, and small airways dis...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.116.1.231

    authors: Stănescu D

    更新日期:1999-07-01 00:00:00

  • Tissue plasminogen activator for the treatment of deep venous thrombosis of the lower extremity: a systematic review.

    abstract:OBJECTIVE:To assess, by systematic review, the efficacy and safety of recombinant tissue plasminogen activator (rt-PA) in the treatment of lower extremity deep venous thrombosis (DVT). A secondary objective is to assess the optimal dose and route of administration of rt-PA. METHODS:Included studies were randomized, co...

    journal_title:Chest

    pub_type: 杂志文章,评审

    doi:10.1378/chest.119.2.572

    authors: Forster A,Wells P

    更新日期:2001-02-01 00:00:00

  • Bronchial hyperresponsiveness in asthmatic children. Correlation with macrophages and eosinophils in broncholavage fluid.

    abstract::Bronchial responsiveness assessed by histamine bronchial challenge testing in 22 children with chronic stable asthma was compared with the number of inflammatory cells per milliliter of broncholavage fluid obtained by fiberoptic bronchoscopy. Hyperresponsiveness was closely correlated with increased counts of eosinoph...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.96.5.988

    authors: Ferguson AC,Wong FW

    更新日期:1989-11-01 00:00:00

  • Left ventricular function during stable sustained ventricular tachycardia. Hemodynamic and echo-Doppler analysis.

    abstract::To assess the left ventricular function during sustained stable ventricular tachycardia (VT), ten patients, aged 58 to 74, underwent simultaneous echo-Doppler and hemodynamic studies during sinus rhythm and induced sustained stable monomorphic VT. The VT cycle length was 447 +/- 92 ms (mean +/- SD). During VT, cardiac...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.96.2.275

    authors: Baron SB,Huang SK,Comess KA

    更新日期:1989-08-01 00:00:00

  • Marginal utility of montelukast for persistent asthma.

    abstract:BACKGROUND:The efficacy of a new pharmacologic agent for asthma, in this instance the leukotriene receptor antagonist montelukast, is determined in controlled trials in research subjects. The utility of a new drug is determined by multiple uncontrollable factors in individual patients. OBJECTIVE:To assess the utility ...

    journal_title:Chest

    pub_type: 临床试验,杂志文章

    doi:10.1378/chest.121.2.334

    authors: Mathison DA,Koziol JA

    更新日期:2002-02-01 00:00:00

  • Soluble form of fas and fas ligand in BAL fluid from patients with pulmonary fibrosis and bronchiolitis obliterans organizing pneumonia.

    abstract:STUDY OBJECTIVES:The Fas-Fas ligand (FasL) pathway is a representative system of apoptosis-signaling receptor molecules. We previously described that this pathway may play an important role in the pathogenesis of fibrosing lung diseases. In this study, we hypothesized that soluble form of Fas (sFas) and FasL (sFasL) ma...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.118.2.451

    authors: Kuwano K,Kawasaki M,Maeyama T,Hagimoto N,Nakamura N,Shirakawa K,Hara N

    更新日期:2000-08-01 00:00:00

  • Effects on the renin-angiotensin system of agents acting at central and peripheral adrenergic receptors.

    abstract::Although the principal actions of clonidine are linked to its centrally mediated suppression of sympathetic activity, its inhibition of the renin axis also may contribute to its antihypertensive effects. In patients with essential hypertension studied in a clinical research center, clonidine-induced decreases in diast...

    journal_title:Chest

    pub_type: 杂志文章

    doi:

    authors: Weber MA,Drayer JI,Hubbell FA

    更新日期:1983-02-01 00:00:00

  • "High-Risk" Clinical and Inflammatory Clusters in COPD of Chinese Descent.

    abstract:BACKGROUND:COPD is a heterogeneous disease demonstrating inter-individual variation. A high COPD prevalence in Chinese populations is described, but little is known about disease clusters and prognostic outcomes in the Chinese population across Southeast Asia. We aim to determine if clusters of Chinese patients with CO...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1016/j.chest.2020.01.043

    authors: Tiew PY,Ko FWS,Narayana JK,Poh ME,Xu H,Neo HY,Loh LC,Ong CK,Mac Aogáin M,Tan JHY,Kamaruddin NH,Sim GJH,Lapperre TS,Koh MS,Hui DSC,Abisheganaden JA,Tee A,Tsaneva-Atanasova K,Chotirmall SH

    更新日期:2020-07-01 00:00:00

  • Potassium-induced cardioplegia in patients undergoing correction of congenital heart defects.

    abstract::Beginning in July 1977, cold potassium-induced cardioplegia has been used in 60 consecutive patients undergoing correction of congenital heart defects in whom the aorta was cross clamped. Ages ranged from 4 weeks to 18 years (mean 5.8 years); 40 percent were less than 24 months of age. Surgery included correction of v...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.78.2.316

    authors: Crawford FA Jr,Barnes TY,Heath BJ

    更新日期:1980-08-01 00:00:00

  • Clinical significance of a multiple biomarker assay in patients with lung cancer. A study with logistic regression analysis.

    abstract::The relative usefulness of a combination of some tumor markers, such as CEA, AFP, ferritin and NSE for the diagnosis of lung cancer was assessed by multiple logistic analysis. Serum concentration of these markers was determined in 68 patients with lung cancer (50 with NSCLC and 18 with SCLC, in 68 patients with benign...

    journal_title:Chest

    pub_type: 杂志文章

    doi:10.1378/chest.97.3.639

    authors: Lombardi C,Tassi GF,Pizzocolo G,Donato F

    更新日期:1990-03-01 00:00:00