Search Results
Results 151 - 200 of 279
1 2 3 4 5 6 >
Braun U - - 2007
Traumatic pericarditis was confirmed postmortem in 28 cattle that had shown signs of a heart rate of more than 100 bpm, distended jugular veins and muffled heart sounds or abnormal pericardial sounds. The heart rate was higher than normal in 24 of them, and in 18 of these it ranged ...
Michaels Andrew D - - 2007
BACKGROUND: One of the clinical hallmarks of constrictive pericarditis is the pericardial knock, a high-pitched early diastolic heart sound. Making the clinical diagnosis of constrictive pericarditis is challenging, as is accurate auscultation of the pericardial knock. HYPOTHESIS: We sought to assess the utility of a computerized acoustic cardiographic device in ...
Johnston Michael - - 2007
Dyspnea is a common presenting complaint in the emergency department (ED). Rapid identification of heart failure as the etiology leads to early implementation of targeted therapies. Although having only intermediate sensitivity, the S3 is a highly specific finding among older adults with heart failure. Identification of an S3 by routine ...
Jain Manoj - - 2008
In this essay, we present the spectrum of intrahepatic and extrahepatic bile duct abnormalities seen on MRCP in patients with recurrent pyogenic cholangitis. MRCP is a promising, noninvasive alternative to more invasive direct cholangiography for evaluating the intrahepatic and extrahepatic bile ducts in patients with recurrent pyogenic cholangitis.
Umeda Tomofumi - - 2007
BACKGROUND: The closure sound of the ATS bileaflet mechanical valve is said to be quieter than that of the other mechanical valves. However, the reasons for this are still unknown. In this study, we investigated the reasons for the quietness of the ATS valve closure sound. PATIENTS AND METHODS: The ...
Syed Zeeshan - - 2007
Skilled cardiologists perform cardiac auscultation, acquiring and interpreting heart sounds, by implicitly carrying out a sequence of steps. These include discarding clinically irrelevant beats, selectively tuning in to particular frequencies and aggregating information across time to make a diagnosis. In this paper, we formalize a series of analytical stages for ...
Guion Johnson Marie - - 2007
Advanced digital signal processing has the potential to revolutionize the stethoscope through the use of mathematical algorithms to interpret heart sound acoustic information. In this study, a novel classification algorithm that does not require cardiac cycle segmentation was used for identifying differences between normal and diseased heart sounds. The heart ...
Kumar D - - 2007
Heart failure and heart valvar diseases are chronic heart disorders which are potentially diagnosed using heart sound characteristics. Heart sound components S1 and S2 exhibit significant characteristics for valvar dysfunction while pathological S3 sound is a prominent sign for heart failure in elderly people. In this paper, a new automatic ...
De Melis M - - 2007
Laser Doppler vibrometry has been recently applied for non-contact monitoring of the cardiac activity, both in terms of cardiac rate and heart rate variability, measuring the velocity of the skin surface of the chest wall and the neck (optical Vibrocardiography, VCG). To go further insight in the analysis of VCG ...
Hedayioglu F L - - 2007
Over the years, many attempts have been made to develop special stethoscopes for the teaching of auscultation. The objective of this article is to report on the experience with the development and implementation of an electronic stethoscope and a virtual library of cardiac sounds. There were four stages to this ...
Kawamura Y - - 2007
While vibration source of the heart sound has been well-studied, the propagation route of the heart sound on the chest wall has not been clarified. In this study, we first measured the heat sound simultaneously at 64 positions on the chest wall of healthy subjects using 64 small accelerometers. We ...
Kärki Satu - - 2007
A measurement system for heart sounds was implemented by using ElectroMechanical Film (EMFi). Heart sounds are produced by the vibrations of the cardiac structure. An EMFi transducer attached to the skin of the chest wall converts these mechanical vibrations into an electrical signal. Furthermore, the signal is amplified and transmitted ...
McManus I C - - 2006
The prevalent modern suggestion that Alexander the Great was left-handed probably derives from Michael Barsley's (1966) book, Left-handed man is a right-handed word, perhaps by mutation from as earlier story cited by Wile in 1934 from a 17th century Rabbirical exegesis, which said that Alexander discovered a country where all ...
Yanagawa Youichi - - 2006
A 20-year-old woman presented unconscious due to hypoglycemia after a self-administered insulin injection. Diffusion-weighted MRI (DWI), performed 5 days after admission, demonstrated heterogeneous high-intensity signal areas in both the cortex and subcortex but sparing the motor and sensory centers. On the 11th day after admission, she began making incomprehensible verbal ...
Shah Sanjiv J - - 2006
Bedside diagnostic tools remain important in the care of patients with heart failure. Over the past two centuries, cardiac auscultation and phonocardiography have been essential in understanding cardiac pathophysiology and caring for patients with heart disease. Diastolic heart sounds (S3 and S4) and systolic time intervals have been particularly useful ...
Pichardo Samuel - - 2006
A major cause of superficial venous insufficiency is valvular dysfunction in the great saphenous vein. Dilation of the annulus inhibits valve closure preventing reflux in the vein. This study suggests curing dilation by shrinking the collagen fibers in the vein wall using high-intensity focused ultrasound. An in vitro feasibility study ...
Barba-Pichardo Rafael R Unidad de Arritmias y Marcapasos, Servicio de Cuidados Críticos y Urgencias, Hospital Juan Ramón Jiménez, Huelva, - - 2006
Permanent His-bundle pacing is effective in patients with supra-Hisian atrioventricular block. We report our experience in patients with infra-Hisian atrioventricular block. The study involved selected patients referred for syncope and intraventricular conduction disturbance, infra-Hisian atrioventricular block, with left ventricular dyssynchrony and no coronary sinus access. All patients underwent electrophysiological study ...
Makino Tsutomu - - 2006
We have developed an automatic diagnosis system of an artificial heart in order to ensure the safety of the patient implanted with the artificial heart. The automatic diagnosis system is composed of an electro-stethoscope system, adaptive noise canceller (ANC), and artificial neural network (ANN). The ANC effectively eliminates ambient noise ...
Pietila, A
A significant percentage of young children present cardiac murmurs. However, only one percent of them are caused by a congenital heart defect; others are physiological. Auscultation of the heart is still the primary diagnostic tool for judging the type of cardiac murmur. An automated system for an initial recording and ...
Kumar D - - 2006
A new unsupervised and low complexity method for detection of S1 and S2 components of heart sound without the ECG reference is described The most reliable and invariant feature applied in current state-of-the-art of unsupervised heart sound segmentation algorithms is implicitly or explicitly the S1-S2 interval regularity. However; this criterion ...
Lang Alexander B - - 2006
Animals are exposed to many conflicting ecological pressures, and the effect of one may often obscure that of another. A likely example of this is the so-called "lunar phobia" or reduced activity of bats during full moon. The main reason for lunar phobia was thought to be that bats adjust ...
Nigam Vivek - - 2005
Segmentation of the phonocardiogram into its major sound components is the first step in the automated diagnosis of cardiac abnormalities. Almost all of the existing phonocardiogram segmentation algorithms utilize absolute amplitude or frequency characteristics of heart sounds, which vary from one cardiac cycle to the other and across different patients. ...
Hernandez Jorge A - - 2005
OBJECTIVE: To compare calving-to-conception intervals among cows classified as nonlame, moderately lame, or lame during the prebreeding postpartum period and to examine the relationship between severity of lameness and time to conception in cows that were classified as lame. DESIGN: Longitudinal study. ANIMALS: 499 Holstein cows. PROCEDURE: Cows in the ...
Foo Ning-Hui - - 2005
A 1-year-5-months-old female who had cough, rhinorrhea and prolonged fever for 19 days was admitted to the intensive care unit due to exertional dyspnea. She was intubated promptly in virtue of hypotension and cyanosis. The physical examination demonstrated diminished breathing sound over the right lung and distant heart sound; echocardiogram ...
El-Segaier M - - 2005
To develop a digital algorithm that detects first and second heart sounds, defines the systole and diastole, and characterises the systolic murmur. Heart sounds were recorded in 300 children with a cardiac murmur, using an electronic stethoscope. A Digital algorithm was developed for detection of first and second heart sounds. ...
Herold J - - 2005
Traditional auscultation performed by the general practitioner remains problematic and often gives significant results only in a late stage of heart valve disease. Valve stenoses and insufficiencies are nowadays diagnosed with accurate but expensive ultrasonic devices. This study aimed to develop a new heart sound analysis method for diagnosing aortic ...
Marcus Gregory M - - 2005
CONTEXT: The third (S3) and fourth (S4) heart sounds detected by phonocardiography are considered to represent the criterion standards of the gallop sounds, but their test characteristics have not been explored. OBJECTIVE: To determine the diagnostic test characteristics of the S3 and S4 for prediction of left ventricular dysfunction using ...
Montijano Cabrera Angela M AM Unidad de Arritmias, Servicio de Cardiología, Hospital Clínico-Universitario Virgen de la Victoria, Málaga, - - 2005
The frequent occurrence of ventricular tachycardia can be a serious problem for patients with an implantable defibrillator, and may necessitate adjuvant antiarrhythmic therapy or radiofrequency catheter ablation. We analyzed the long-term results obtained with this latter therapy in patients suffering from frequent or continuous ventricular tachycardia. Eighteen ablation procedures were ...
Hult P - - 2005
Heart sounds can be considered as mechanical fingerprints of myocardial function. The third heart sound normally occurs in children but disappears with maturation. The sound can also appear in patients with heart failure. The sound is characterised by its low-amplitude and low-frequency content, which makes it difficult to identify by ...
Hagerman Inger - - 2005
AIM OF THE STUDY: To evaluate the possible role of room acoustics on patients with coronary artery disease and to test the hypothesis that a poor acoustics environment is likely to produce a bad work environment resulting in unwanted sound that could adversely affect the patients. METHODS AND RESULTS: A ...
Narain Varun S - - 2005
BACKGROUND: Auscultation of the third heart sound is an age-old sign for predicting ventricular dysfunction. New technology and biomarkers like two-dimensional echocardiography and N-terminal pro brain natriuretic peptide, respectively, have sidelined the utility of this sign, which does not involve any cost and is readily accessible. We sought to find ...
Nielsen Thomas - - 2005
BACKGROUND AND AIM OF THE STUDY: Mechanical heart valves produce short clicking sounds during closure. These closing sounds are annoying for some patients and their partners by causing sleeping disorders or social embarrassment. Various methods for measuring the sounds have been developed both in vitro and in vivo using calculation ...
Villacastin Julián J Unidad de Arritmias, Instituto Cardiovascular. Hospital Clinico San Carlos, Madrid, - - 2005
We describe 3 patients with ventricular tachycardia in whom epicardial ablation was done after prior attempts of endocardial ablation had failed. Clinical ventricular tachycardia originated at the right ventricular outflow tract in 1 patient and near the mitral annulus in another patient. In these 2 cases ventricular tachycardia was mapped ...
Wellens Hein J J - - 2004
The introduction of programmed electrical stimulation of the heart and intracardiac activation mapping 35 years ago made it possible to study the site of origin or pathway of a supraventricular tachycardia and to gain insight into the tachycardic mechanism. Information from these studies has been the basis for the development ...
Mehta Nirav J - - 2004
Auscultation of third heart sound has been performed for more than a century, an interest that not only persists today, but also has experienced renewed emphasis. Sophisticated study of the third heart sound by current investigative techniques has underscored the value of clinical detection with the time-honored stethoscope. This review ...
Hult P - - 2004
The third heart sound is normally heard during auscultation of younger individuals but disappears with increasing age. However, this sound can appear in patients with heart failure and is thus of potential diagnostic use in these patients. Auscultation of the heart involves a high degree of subjectivity. Furthermore, the third ...
Okamoto Eiji - - 2004
Early diagnosis of the malfunction of a mechanical artificial heart implanted in a patient who has been discharged from hospital is very important. We have developed an electro-stethoscope system that enables the malfunction of an artificial heart to be detected from the analysis of sound signals from the artificial heart. ...
Watrous Raymond L - - 2004
A pilot study was conducted to ascertain the level of agreement between auscultatory findings derived from heart sound recordings by a cardiologist and the results of a computer-based heart sound analysis algorithm. Heart sound recordings were obtained from volunteer subjects previously diagnosed with hypertrophic cardiomyopathy. Twenty-second recordings were obtained at ...
Hayek C Scott - - 2003
Despite advances in imaging technologies for the heart, screening of patients for cardiac pathology continues to include the use of traditional stethoscope auscultation. Detection of heart murmurs by the primary care physician often results in the ordering of additional expensive testing or referral to cardiology subspecialists, although many of the ...
Tricoire Hélène - - 2003
In the sheep, the pineal hormone melatonin displays nocturnal levels 20 times as high in the cerebrospinal fluid of the third ventricle as in the jugular blood. Moreover, in the pineal recess, the evagination of the third ventricle into the pineal stalk, the levels of melatonin in the cerebrospinal fluid ...
DeGroff C G - - 2001
BACKGROUND: Early recognition of heart disease is an important goal in pediatrics. Efforts in developing an inexpensive screening device that can assist in the differentiation between innocent and pathological heart murmurs have met with limited success. Artificial neural networks (ANNs) are valuable tools used in complex pattern recognition and classification ...
Tuchinda C - - 2001
The clinical skill of cardiac auscultation, while known to be sensitive, specific, and inexpensive in screening for cardiac disease among children, has recently been shown to be deficient among residents in training. This decline in clinical skill is partly due to the difficulty in teaching auscultation. Standardization, depth, and breadth ...
Masugata H - - 1999
If myocardial tissue can be assumed to be fluid-like, myocardial tissue elasticity can be estimated by the sound speed of tissue based on the equation K = rho(c)2, where K is the elastic bulk modulus, rho is density, and c is the sound speed of tissue. However, little data exist ...
Masugata H - - 1999
The purpose of the present study was to evaluate the acoustic properties of myocytes in normal, pressure-overload hypertrophic, and amyloid myocardium. Myocardial tissue specimens at autopsy were obtained from 10 subjects without cardiovascular disease, six patients with left ventricular (LV) hypertrophy, and six patients with cardiac amyloidosis. Sound speed of ...
Cozic M - - 1998
The authors describe a cardiac acoustic mapping system designed to acquire, analyse, and display the amplitude distribution of a phonocardiogram (PCG) recorded from 22 sites on the thorax. A new PCG envelope detection approach, implemented by analogue circuits, enables simultaneous sampling of PCG envelopes from the 22 sites at a ...
Voon Wel-Chol - - 1998
Controversies exist about the timing relationship between the fourth heart sound and the ventricular inflow Doppler events. Besides, there has been no data about the timing relationship between the fourth heart sound and the ventricular outflow Doppler events. This study was designed to measure these phono-Doppler timing relationships and to ...
Cichero J A - - 1998
A hypothetical discussion of the cause of swallowing sounds is presented. It is suggested that the pharynx contains a number of valves and pumps that produce reverberations within the pharynx to generate swallowing sounds. As heart sounds are propagated via vibration of muscles and valves, it is further suggested that ...
Marcon Carlo - - 1997
Doppler echocardiographic variables were sought for predicting the third and fourth heart sounds, as documented by phonocardiography. Phonocardiographic recordings of gallop sounds and Doppler echocardiographic investigations of mitral inflow and pulmonary venous flow were evaluated in 85 subjects by discriminant and multiple regression analysis. Of 85 subjects 47% had a ...
Ishikawa M - - 1997
Patients (n = 181) with a myocardial infarction, with (n = 20) or without (n = 161) a clearly audible fourth heart sound detected 1 month after the onset of a myocardial infarction, were followed for 56.2 +/- 21.4 months for cardiac events (death, myocardial infarction, percutaneous transluminal coronary angioplasty, ...
Voon Wen-Chol - - 1997
To investigate the characters of the transmitted transmitral A wave associated with a fourth heart sound, left ventricular inflow, and outflow Doppler echocardiography and phonocardiography were recorded in 13 patients with a fourth heart sound and 9 age-matched control subjects. The Doppler echocardiographic data were compared between both groups and ...
1 2 3 4 5 6 >