Digital stethoscopes offer new opportunities for computerized analysis of heart sounds. Segmentation of heart sound recordings into periods related to the first and second heart sound (S1 and S2) is fundamental in the analysis process. However, segmentation of heart sounds recorded with handheld stethoscopes in clinical environments is often complicated by background noise. A duration-dependent hidden Markov model (DHMM) is proposed for robust segmentation of heart sounds. The DHMM identifies the most likely sequence of physiological heart sounds, based on duration of the events, the amplitude of the signal envelope and a predefined model structure. The DHMM model was developed and tested with heart sounds recorded bedside with a commercially available handheld stethoscope from a population of patients referred for coronary arterioangiography. The DHMM identified 890 S1 and S2 sounds out of 901 which corresponds to 98.8% (CI: 97.8-99.3%) sensitivity in 73 test patients and 13 misplaced sounds out of 903 identified sounds which corresponds to 98.6% (CI: 97.6-99.1%) positive predictivity. These results indicate that the DHMM is an appropriate model of the heart cycle and suitable for segmentation of clinically recorded heart sounds.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1088/0967-3334/31/4/004 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Automated system for diagnosing pulmonary fibrosis using crackle analysis in recorded lung sounds based on iterative envelope mean fractal dimension filter.
Physiol Meas
January 2025
Universita Cattolica del Sacro Cuore, Rome, Italy, Largo Francesco Vito, 1, 00168 Roma RM, Italy, Rome, 00168, ITALY.
Patients with pulmonary fibrosis (PF) often experience long waits before getting a correct diagnosis, and this delay in reaching specialized care is associated with increased mortality, regardless of the severity of the disease. Early diagnosis and timely treatment of PF can potentially extend life expectancy and maintain a better quality of life. Crackles present in the recorded lung sounds may be crucial for the early diagnosis of PF.
View Article and Find Full Text PDFEnhancing Psychophysiological Well-Being Through Nature-Based Soundscapes: An Examination of Heart Rate Variability in a Cross-Over Study.
Psychophysiology
January 2025
Active Life Lab, South-Eastern Finland University of Applied Sciences, Mikkeli, Finland.
Stress and psychological disorders are substantial public health concerns, necessitating innovative therapeutic strategies. This study investigated the psychophysiological benefits of nature-based soundscapes, drawing on the biophilia hypothesis. Using a randomized, acute cross-over design, 53 healthy participants experienced either a nature-based or a reference soundscape for 10 min, with a 2-min washout period.
View Article and Find Full Text PDFPsychological induction of interoceptive hunger cues and their effect on food desire.
Appetite
January 2025
School of Psychology, Macquarie University, Sydney, NSW, 2109, Australia.
Certain interoceptive hunger cues are caused by gut physiology. These interoceptive cues may have psychological consequences, namely an ability to enhance the desire to eat, which are independent of their physiological cause. Testing this idea is difficult because the physiological processes are normally linked to any consequence.
View Article and Find Full Text PDFImmediate management of a cirrhosis-induced severe pericardial effusion: a case report and review of the literature.
J Med Case Rep
January 2025
Cardiac Surgery Department, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran.
Introduction: Cardiac tamponade is a life-threatening condition resulting from fluid accumulation in the pericardial sac, leading to decreased cardiac output and shock. Various etiologies can cause cardiac tamponade, including liver cirrhosis, which may be induced by autoimmune hepatitis. Autoimmune hepatitis is a chronic inflammatory liver disease characterized by interface hepatitis, elevated transaminase levels, autoantibodies, and increased immunoglobulin G levels.
View Article and Find Full Text PDFNoise Reduction in Abdominal Acoustic Recordings of Maternal Placental Murmurs.
Biomed Phys Eng Express
January 2025
Department of Health Science and Technology, Aalborg University, Selma Lagerløfs Vej 249, Aalborg, 9260, DENMARK.
Unlabelled: Fetal phonocardiography is a well-known auscultation technique for evaluation of fetal health. However, murmurs that are synchronous with the maternal heartbeat can often be heard while listening to fetal heart sounds. Maternal placental murmurs (MPM) could be used to detect maternal cardiovascular and placental abnormalities, but the recorded MPMs are often contaminated by ambient interference and noise.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!