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acoustic cardiography

Shang Wang, Ming Liu, Fang Fang, Qing Shang, Jing Ping Sun, John E Sanderson, Cheuk Man Yu
BACKGROUND: Rapid risk stratification in patients with heart failure is critically important but challenging. The aim of our study is to ascertain whether acoustic cardiography can identify heart failure (HF) patients at high risk for mortality. METHODS: A total of 474 HF patients were enrolled into our study (76±11years old). Acoustic cardiographic parameters included S3 score (ie, third heart sound exists) and systolic dysfunction index (SDI) (correlated closely with left ventricular systolic dysfunction)...
September 15, 2016: International Journal of Cardiology
Yong-Na Wen, Alex Pui-Wai Lee, Fang Fang, Chun-Na Jin, Cheuk-Man Yu
Cardiac auscultation by stethoscope is widely used but limited by low sensitivity and accuracy. Phonocardiogram was developed in an attempt to provide quantitative and qualitative information of heart sounds and murmurs by transforming acoustic signal into visual wavelet. Although phonocardiogram provides objective heart sound information and holds diagnostic potentials of different heart problems, its examination procedure is time-consuming and it requires specially trained technicians to operate the device...
April 1, 2014: International Journal of Cardiology
Remo Beeler, Andreas W Schoenenberger, Peter Bauer, Richard Kobza, Michael Bergner, Xavier Mueller, Reinhard Schlaepfer, Michel Zuber, Susanne Erne, Paul Erne
AIMS: Device-based pacing-induced diaphragmatic stimulation (PIDS) may have therapeutic potential for chronic heart failure (HF) patients. We studied the effects of PIDS on cardiac function and functional outcomes. METHODS AND RESULTS: In 24 chronic HF patients with CRT, an additional electrode was attached to the left diaphragm. Randomized into two groups, patients received the following PIDS modes for 3 weeks in a different sequence: (i) PIDS off (control group); (ii) PIDS 0 ms mode (PIDS simultaneously with ventricular CRT pulse); or (iii) PIDS optimized mode (PIDS with optimized delay to ventricular CRT pulse)...
March 2014: European Journal of Heart Failure
Wen-bo Zhang, Geng Xu, Ying Zhou
No abstract text is available yet for this article.
August 2013: Zhonghua Xin Xue Guan Bing za Zhi
Jung Hee Seo, Vijay Vedula, Theodore Abraham, Rajat Mittal
A multiphysics simulation approach is developed for predicting cardiac flows as well as for conducting virtual echocardiography (ECHO) and phonocardiography (PC) of those flows. Intraventricular blood flow in pathological heart conditions is simulated by solving the three-dimensional incompressible Navier-Stokes equations with an immersed boundary method, and using this computational hemodynamic data, echocardiographic and phonocardiographic signals are synthesized by separate simulations that model the physics of ultrasound wave scattering and flow-induced sound, respectively...
August 2013: International Journal for Numerical Methods in Biomedical Engineering
William Chan, Maryam Woldeyohannes, Rebecca Colman, Patti Arand, Andrew D Michaels, John D Parker, John T Granton, Susanna Mak
OBJECTIVE: To examine the relationship between acoustic characteristics of the first and second heart sounds (S1 and S2) and underlying cardiac structure and haemodynamics in patients with isolated pulmonary arterial hypertension (PAH) and controls. DESIGN: Prospective multicentre cohort study. SETTING: Tertiary referral and community hospitals. PARTICIPANTS: We prospectively evaluated 40 PAH patients undergoing right-heart catheterisation with contemporaneous digital acoustic cardiography (intensity and complexity) and two-dimensional transthoracic echocardiography...
2013: BMJ Open
Shang Wang, Fang Fang, Ming Liu, Yat Yin Lam, Jing Wang, Qing Shang, Jing Ping Sun, John E Sanderson, Cheuk Man Yu
BACKGROUND: Low left ventricular ejection fraction (LVEF) and the presence of restrictive LV filling pattern are poor prognosticators in heart failure patients with reduced EF (HFREF). We sought to investigate whether acoustic cardiography can identify these high-risk HFREF subgroups. METHODS: A total of 127 HFREF patients (EF<50%) were enrolled into our study. All patients underwent acoustic cardiographic and echocardiographic examinations. Acoustic cardiographic parameters included S3 score (probability that the third heart sound exists), electromechanical activation time (EMAT, interval from Q wave to the first heart sound; %EMAT is the proportion of cardiac cycle that EMAT occupies), and systolic dysfunction index (SDI, a derived variable from the combination of %EMAT, S3 score, QRS duration and QR interval)...
October 3, 2013: International Journal of Cardiology
Stefan Toggweiler, Yvonne Odermatt, Andreas Brauchlin, Thilo Zander, Andrea Müller, Michel Zuber, Ralph Winterhalder, Paul Erne
BACKGROUND: Investigate the usefulness of echocardiography and acoustic cardiography to monitor patients exposed to anthracycline chemotherapy. HYPOTHESIS: Serial echocardiographies to monitor systolic function may not be neccessary in all patients undergoing anthracycline chemotherapy. METHODS: In a prospective study, consecutive patients undergoing anthracycline-containing chemotherapy were evaluated with echocardiography and acoustic cardiography at baseline, after completion of chemotherapy, and after a median follow-up of 3...
April 2013: Clinical Cardiology
Shang Wang, Yat-Yin Lam, Ming Liu, Fang Fang, Jing Wang, Qing Shang, Jing-Ping Sun, John E Sanderson, Cheuk-Man Yu
BACKGROUND: The prevalence of heart failure (HF) is increasing as the population ages, but its rapid diagnosis and phenotype identification remain challenging. We sought to determine whether acoustic cardiography can accurately identify HF and its phenotypes. METHODS: Three cohorts of patients were studied [94 with hypertension, 109 with HF and normal ejection fraction (HFNEF, EF ≥ 50%) and 89 with HF and reduced ejection fraction (HFREF, EF<50%)]. All participants received acoustic cardiography and echocardiography examinations...
August 10, 2013: International Journal of Cardiology
Roger Dillier, Michel Zuber, Patricia Arand, Susanne Erne, Paul Erne
BACKGROUND: Adequately recording diastolic heart sounds and systolic time intervals over longer periods is difficult. Thus, information on the circadian variation of these parameters in an ambulatory population is lacking. Moreover, age-related changes in the prevalence of diastolic heart sounds and measurements of systolic time intervals in an asymptomatic population have not been studied in continuous recordings. HYPOTHESIS: Diastolic heart sounds and systolic time intervals will have age and circadian variations that reflect known changes in cardiac function due to aging and circadian rhythms...
June 2011: Clinical Cardiology
Roger Dillier, Michel Zuber, Patricia Arand, Susanne Erne, Paul Erne
INTRODUCTION. The circadian variation of heart function and heart sounds in patients with and without heart failure (HF) is poorly understood. We hypothesized HF patients would exhibit less circadian variation with worsened cardiac function and sleep apnea. METHODS. We studied 67 HF patients (age 67.4 ± 8.2 years; 42% acute HF) and 63 asymptomatic control subjects with no history of HF (age 61.6 ± 7.7 years). Subjects wore a heart sound/ECG/respiratory monitor. The data were analyzed for sleep apnea, diastolic heart sounds, and systolic time intervals...
August 2011: Annals of Medicine
Michel Zuber, Paul Erne
AIM: To assess if performance of 12-lead exercise tolerance testing (ETT) can be improved by simultaneous acoustic cardiography and to compare the diagnostic performances of electrocardiography (ECG) during ETT and acoustic cardiography for detection or exclusion of angiographically proven coronary artery disease (CAD). METHODS: We conducted an explorative study with retrospective data analysis using a convenience sample of consecutive patients (n = 59, mean age: 62 years) from an outpatient clinic in Switzerland, who were referred for ETT by their general practitioner on suspicion of CAD, and in whom, coronary angiography was carried out...
May 26, 2010: World Journal of Cardiology
Douglas L Kosmicki, Sean P Collins, Michael C Kontos, Michel Zuber, Peter Kipfer, Christine Attenhofer Jost, Andrew D Michaels
The signs and symptoms of systolic heart failure are frequently insensitive and nonspecific, making an accurate bedside diagnosis of left ventricular systolic dysfunction (LVSD) challenging. B-type natriuretic peptide (BNP) is often used, but is not diagnostically useful when in the indeterminate range. The authors investigated the diagnostic test characteristics of acoustic cardiographic parameters to identify patients with LVSD. Four hundred thirty-three patients with contemporaneous measurements of computerized acoustic cardiography, BNP, and echocardiography were included...
November 2010: Congestive Heart Failure
S Gupta, N Gupta, P Arand, A D Michaels
BACKGROUND: Rheumatic mitral stenosis severity has been assessed by the systolic time interval between the QRS onset and the first heart sound (QS1) by phonocardiography. We hypothesized that non-invasive computerized acoustic cardiography could evaluate mitral stenosis severity compared with echocardiography and invasive haemodynamics in patients undergoing percutaneous transvenous mitral commissurotomy (PTMC). METHODS: 27 patients underwent computerized acoustic cardiography, echocardiography, and invasive haemodynamic measurements prior to and after PTMC...
January 2011: Journal of Medical Engineering & Technology
Roger Dillier, Richard Kobza, Susanne Erne, Michel Zuber, Patricia Arand, Paul Erne
Objectives. Assessment of left ventricular (LV) systolic function in patients with atrial fibrillation can be difficult. Acoustic cardiography provides several parameters for quantifying LV systolic function. We evaluated the ability of acoustic cardiography to detect LV systolic dysfunction in patients with and without atrial fibrillation. Design. We studied 194 patients who underwent acoustic cardiography and cardiac catheterization including measurement of angiographic ejection fraction (EF) and maximum LV dP/dt...
2010: Cardiology Research and Practice
Michel Zuber, Markus Roos, Richard Kobza, Stefan Toggweiler, Rolf Meier, Paul Erne
The authors investigated acoustic cardiography, the digital analysis of electrocardiogram (ECG) and heart sounds, to detect phrenic nerve stimulation (PNS) and assess its hemodynamic significance. They studied 42 patients and induced 46 instances of PNS induced through cardiac pacing at various locations in the heart. These 46 instances of PNS were either independently documented using fluoroscopy or were symptomatic. The authors collected acoustic cardiography data including the electromechanical activation time (interval from Q onset to the first heart sound [S1]) as a percentage of the RR interval (%EMAT) to assess systolic function...
July 2010: Congestive Heart Failure
W Frank Peacock, Karina M Soto
Early in the management of acute illness, it is critically important that volume status is accurately estimated. If inappropriate therapy is given because of errors in volume assessment, acute mortality rates are increased. Unfortunately, as the gold standard of radioisotopic volume measurement is costly and time-consuming, in the acute care environment clinicians are forced to rely on less accurate measures. In this manuscript, the authors review the currently available techniques of volume assessment for patients presenting with acute illness...
July 2010: Congestive Heart Failure
Alan S Maisel, W Frank Peacock, Kevin S Shah, Paul Clopton, Deborah Diercks, Brian Hiestand, Michael C Kontos, Christian Mueller, Richard Nowak, Wen Jone Chen, Sean P Collins
BACKGROUND: Dyspneic emergency department (ED) patients present a diagnostic dilemma. The S3, although highly specific for acute heart failure (AHF) and predicting death and readmission, is often difficult to auscultate. The HEart failure and Audicor technology for Rapid Diagnosis and Initial Treatment (HEARD-IT) multinational trial evaluated the S3 via acoustic cardiography (Audicor). Our goal in this secondary analysis was to determine if the strength of the S3 can provide diagnostic/prognostic information in problematic heart failure subgroups...
October 2011: American Journal of Emergency Medicine
W Frank Peacock, Karina M Soto
The estimation of volume status is of critical importance in the early management of acute illness. Inappropriate therapy, given when errors in volume assessment go unrecognized, is associated with increased acute mortality rates. Unfortunately, the gold standard of radioisotopic volume measurement is neither rapid nor inexpensive, thus leaving the clinician to rely on less accurate measures. This chapter reviews the available methods of volume assessment in the acute care environment. In addition to the history, physical exam, and standard radiographic techniques for volume assessment, the newer technologies of acoustic cardiography, bedside ultrasound, and bioimpedance are presented...
2010: Contributions to Nephrology
Andrew D Michaels, Farman U Khan, Brian Moyers
BACKGROUND: Clinical assessment of diastolic heart sounds is challenging. HYPOTHESIS: We sought to examine whether visual inspection of acoustic cardiographic tracings augments the accuracy of medical students' and physicians' detection of third and fourth heart sounds (S(3), S(4)) compared to auscultation alone. METHODS: A total of 90 adults referred for left heart catheterization underwent digital precordial heart sound recordings by computerized acoustic cardiography...
March 2010: Clinical Cardiology
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