- Assessment of systolic and diastolic function in clinically healthy horses using ambulatory acoustic cardiography. [Journal Article]
- EVEquine Vet J 2018 Sep 01
- CONCLUSIONS: Overnight Audicor® recordings are feasible in horses. Combining ambulatory ECG and phonocardiography allows non-invasive, continuous assessment of variables representing systolic and diastolic cardiac function. ECG rhythm analyses require overreading by a specialist, but acoustic cardiography variables are based on automated algorithms independent of examiner input. Further studies are required to establish the clinical value of acoustic cardiography in horses. This article is protected by copyright. All rights reserved.
- An automatic segmentation method for heart sounds. [Journal Article]
- BEBiomed Eng Online 2018 Aug 06; 17(1):106
- CONCLUSIONS: The proposed method shows reliable performance on the segmentation of heart sounds. Compared with previous works, this method can be applied to not only normal heart sounds, but also the sounds with S3, S4 and murmurs, thus greatly increasing the applied range.
- Murmur Associated with Diastolic Paradoxical Jet Flow in a 43-Year-Old Man with Hypertrophic Cardiomyopathy. [Case Reports]
- THTex Heart Inst J 2018; 45(2):102-105
- A diastolic paradoxical jet flow, often seen in patients with hypertrophic cardiomyopathy, is a unique flow from the apex toward the base of the left ventricle during isovolumic relaxation. To date, ...
A diastolic paradoxical jet flow, often seen in patients with hypertrophic cardiomyopathy, is a unique flow from the apex toward the base of the left ventricle during isovolumic relaxation. To date, this phenomenon appears to have been noninvasively detected only on echocardiograms. We report the case of a 43-year-old man with hypertrophic cardiomyopathy and a diastolic paradoxical jet flow, in whom cardiac auscultation revealed a soft S4, a systolic ejection murmur, and a low-pitched early diastolic murmur immediately after S2 at the apex. On comparing his echocardiographic findings with those on phonocardiograms and apexcardiograms, we confirmed that the unusual murmur coincided with the diastolic jet flow. To our knowledge, this is the first case in which heart murmurs associated with a diastolic paradoxical jet flow have been clearly described. Because these flows can increase the risk of adverse outcomes, detecting any associated murmurs by methods other than echocardiography is worthwhile, even in the era of advanced imaging techniques.
- Interventricular Vessel of the Heart. [Journal Article]
- CRCardiol Res 2018; 9(2):111-115
- The communication from right to left through the interventricular septum of the heart became identified by the anatomical study for 4 years. One thousand nine hundred years ago, Galen stated that blo...
The communication from right to left through the interventricular septum of the heart became identified by the anatomical study for 4 years. One thousand nine hundred years ago, Galen stated that blood seeps through the perforations in the interventricular septum of the heart. However, William Harvey, working 400 years ago, failed to find any. The interventricular vessel is a slit between the fibers of the muscle feasible to be patent by relaxing and widening of the helical heart at the right atrial filling phase at the end of the diastole. The case exhibited the flow of venous blood passing from right to left through the interventricular vessel at the right atrial filling phase concordant to the fourth heart sound. The earliest left ventricular activation closed the interventricular sphincter surrounding the interventricular vessel in the middle of the left muscular part of the interventricular septum. The fourth heart sound is common at the atrial filling phase in hypertrophy of systemic hypertension and in ischemic heart disease. It is necessary to explore vigorously the unknown etiology of the fourth heart sound (S4).
- Third and Fourth Heart Sounds and Myocardial Fibrosis in Hypertrophic Cardiomyopathy. [Journal Article]
- CJCirc J 2018 Jan 25; 82(2):509-516
- CONCLUSIONS: Myocardial fibrosis, as assessed by LGE, was associated with S3 but not with S4 in patients with HCM. These results may contribute to the risk stratification of patients with HCM.
- Cardiac Auscultation for Noncardiologists: Application in Cardiac Rehabilitation Programs: PART I: PATIENTS AFTER ACUTE CORONARY SYNDROMES AND HEART FAILURE. [Review]
- JCJ Cardiopulm Rehabil Prev 2017; 37(5):315-321
- During outpatient cardiac rehabilitation after an acute coronary syndrome or after an episode of congestive heart failure, a careful, periodic evaluation of patients' clinical and hemodynamic status ...
During outpatient cardiac rehabilitation after an acute coronary syndrome or after an episode of congestive heart failure, a careful, periodic evaluation of patients' clinical and hemodynamic status is essential. Simple and traditional cardiac auscultation could play a role in providing useful prognostic information.Reduced intensity of the first heart sound (S1), especially when associated with prolonged apical impulse and the appearance of added sounds, may help identify left ventricular (LV) dysfunction or conduction disturbances, sometimes associated with transient myocardial ischemia. If both S1 and second heart sound (S2) are reduced in intensity, a pericardial effusion may be suspected, whereas an increased intensity of S2 may indicate increased pulmonary artery pressure. The persistence of a protodiastolic sound (S3) after an acute coronary syndrome is an indicator of severe LV dysfunction and a poor prognosis. In patients with congestive heart failure, the association of an S3 and elevated heart rate may indicate impending decompensation. A presystolic sound (S4) is often associated with S3 in patients with LV failure, although it could also be present in hypertensive patients and in patients with an LV aneurysm. Careful evaluation of apical systolic murmurs could help identifying possible LV dysfunction or mitral valve pathology, and differentiate them from a ruptured papillary muscle or ventricular septal rupture. Friction rubs after an acute myocardial infarction, due to reactive pericarditis or Dressler syndrome, are often associated with a complicated clinical course.During cardiac rehabilitation, periodic cardiac auscultation may provide useful information about the clinical-hemodynamic status of patients and allow timely detection of signs, heralding possible complications in an efficient and low-cost manner.
- Variation in effectiveness of a cardiac auscultation training class with a cardiology patient simulator among heart sounds and murmurs. [Journal Article]
- JCJ Cardiol 2017; 70(2):192-198
- CONCLUSIONS: Medical students may be less likely to correctly identify S2/S3/S4 as compared with heart murmurs in a situation close to clinical setting even immediately after training. We may have to consider such a characteristic of students when we provide them with cardiac auscultation training.
- Assessment of cardiovascular disease in the donkey: clinical, echocardiographic and pathological observations. [Journal Article]
- VRVet Rec 2016 Oct 15; 179(15):384
- The Donkey Sanctuary (DS) owns 3500-4000 donkeys, estimated to be about 35 per cent of the UK population. Although postmortem surveys suggest a high prevalence of cardiovascular disease in donkeys, t...
The Donkey Sanctuary (DS) owns 3500-4000 donkeys, estimated to be about 35 per cent of the UK population. Although postmortem surveys suggest a high prevalence of cardiovascular disease in donkeys, there is sparse clinical information about cardiovascular examination findings and echocardiographic findings in health and disease. In this cross-sectional study, auscultation findings were recorded, and in a subset of donkeys, echocardiography was used to screen for structural and functional cardiac disease. 202 donkeys were examined; 117 geldings and 85 females. Heart sounds S1 and S2 were detected in all donkeys, but none had audible S3. S4 was detected in nine (4.5 per cent; significantly older than those without S4; P<0.001). A heart murmur was detected in four donkeys. Echocardiography identified these to be due to a ventricular septal defect in one, and aortic regurgitation in three. An additional 43 donkeys had echocardiography. A further 10 donkeys were identified to have aortic insufficiency, but no other valvular regurgitation. 76/202 donkeys subsequently underwent postmortem examination. Three showed degenerative aortic valve changes. One donkey had nodular lesions in the intima of proximal aorta and sinus of Valsalva. Histopathology showed multifocal chronic nodular eosinophilic arteritis, consistent with verminous arteritis. The DS pathology database identified other similar cases.
- Multistage decision-based heart sound delineation method for automated analysis of heart sounds and murmurs. [Journal Article]
- HTHealthc Technol Lett 2015; 2(6):156-63
- A robust multistage decision-based heart sound delineation (MDHSD) method is presented for automatically determining the boundaries and peaks of heart sounds (S1, S2, S3, and S4), systolic, and diast...
A robust multistage decision-based heart sound delineation (MDHSD) method is presented for automatically determining the boundaries and peaks of heart sounds (S1, S2, S3, and S4), systolic, and diastolic murmurs (early, mid, and late) and high-pitched sounds (HPSs) of the phonocardiogram (PCG) signal. The proposed MDHSD method consists of the Gaussian kernels based signal decomposition (GSDs) and multistage decision-based delineation (MDBD). The GSD algorithm first removes the low-frequency (LF) artefacts and then decomposes the filtered signal into two subsignals: the LF sound part (S1, S2, S3, and S4) and the high-frequency sound part (murmurs and HPSs). The MDBD algorithm consists of absolute envelope extraction, adaptive thresholding, and fiducial point determination. The accuracy and robustness of the proposed method is evaluated using various types of normal and pathological PCG signals. Results show that the method achieves an average sensitivity of 98.22%, positive predictivity of 97.46%, and overall accuracy of 95.78%. The method yields maximum average delineation errors of 4.52 and 4.14 ms for determining the start-point and end-point of sounds. The proposed multistage delineation algorithm is capable of improving the delineation accuracy under time-varying amplitudes of heart sounds and various types of murmurs. The proposed method has significant potential applications in heart sounds and murmurs classification systems.
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- Utility of the physical examination in detecting pulmonary hypertension. A mixed methods study. [Journal Article]
- PlosPLoS One 2014; 9(10):e108499
- CONCLUSIONS: The presence of a loud P2 or audible right-sided 4th heart sound are associated with PH. However the physical examination is unreliable for determining the presence of PH.