Topic
Opening snap
About: Opening snap is a research topic. Over the lifetime, 172 publications have been published within this topic receiving 2859 citations.
Papers published on a yearly basis
1 / 2
Papers
TL;DR: The first derivative thoracic impedance cardiogram may be used not only as a reference tracing to help identify heart sounds on the phonocardiogram, but also for directly timing the intervals within the cardiac cycle.
Abstract: When an alternating current of high frequency is applied to the thorax, the first derivative of the impedance to this current is affected by the cardiac cycle resulting in a characteristic wave form. Phonocardiograms, electrocardiograms, and first derivative thoracic impedance cardiograms were recorded simultaneously in 91 subjects. The first derivative thoracic impedance cardiograms were found to have sharply demarcated points which occur synchronously with the first heart sound, aortic second sound, pulmonic second sound, mitral opening snap, third heart sound, and fourth heart sound. The first derivative thoracic impedance cardiogram may thus be used not only as a reference tracing to help identify heart sounds on the phonocardiogram, but also for directly timing the intervals within the cardiac cycle.
221 citations
TL;DR: In this article, 17 cases of atrial myxoma were reviewed to delineate features that facilitate the correct diagnosis, each patient had features of a classic triad of obstructive, constitutional, and embolic effects.
Abstract: Seventeen cases of atrial myxoma were reviewed to delineate features that facilitate the correct diagnosis. Each patient had features of a classic triad of obstructive, constitutional, and embolic effects. Common findings included a short (two years or less) clinical course in 10, no rheumatic fever in 16, syncope or paroxysmal dizziness in 9, systemic emboli with sinus rhythm in 3, and symptoms of systemic illness in 10. On auscultation, left atrial myxoma mimicked rheumatic mitral valve disease, but discriminating clues were variable auscultatory findings in five patients and an accentuated S, or apparent opening snap with notable mitral regurgitation in four. Features of systemic illness, anemia, or leukocytosis in ten patients and a high sedimentation rate or elevated immunoglobulin level in eight suggested myxoma. Angiography confirmed the preoperative diagnosis. As long as 15 years since surgery, there have been no recurrences following definitive tumor resection at our hospital. (JAMA230:695-701, 1974)
148 citations
TL;DR: A case of left atrial myxohemangioendothelioma, diagnosed ante mortem by removing a tumor embolus to the bifurcation of the aorta, which had been misdiagnosed as having had rheumatic heart disease with paroxysmal atrial fibrillation and embolization to the right middle cerebral artery.
Abstract: A case of left atrial myxohemangioendothelioma, diagnosed ante mortem by removing a tumor embolus to the bifurcation of the aorta, is reported. The patient had been misdiagnosed as having had rheumatic heart disease with paroxysmal atrial fibrillation and embolization to the right middle cerebral artery. In retrospect, because of the characteristics of the second heart sound and absence of an opening snap, a rheumatic etiology should have been questioned. The literature regarding embolization of atrial myxomas has been reviewed.
129 citations
TL;DR: The hypothesis that in the common type of bundle-branch block there is asynchronism in the beginning of ejection from the two ventricles due to delay on the left side is supported.
102 citations
24 Sep 2000
TL;DR: The relatively new transform, the ST, proved to be the best in meeting the objectives, mainly because it yielded highly distinct patterns for each kind of sound.
Abstract: Central to this study was a pathological sound called opening snap (OS). The first objective was to detect this sound in recordings in which it occurred too close in rime to one of the normal sounds, the second heart sound (S2). The second objective was to differentiate between the OS and another sound, the third heart sound (S3), the timing of which is similar to that of OS. Both OS and S3 occur shortly after S2. Three techniques were used and their performance was compared: The Short Time Fourier Transform (STFT), the S Transform (ST) and the Continuous Wavelet Transform (CWT). These transforms yield time-frequency or time-scale representations of the signal. In addition, the ST and the CWT are multiresolution transforms. The ST proved to be the best in meeting the objectives, mainly because it yielded highly distinct patterns for each kind of sound. Being a relatively new transform, the ST had not been applied to heart sounds in the past.
99 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2020 | 3 |
| 2019 | 4 |
| 2018 | 2 |
| 2017 | 3 |
| 2016 | 4 |