The two-dimensional echocardiographic features of three patients with congenital aneurysms of the... more The two-dimensional echocardiographic features of three patients with congenital aneurysms of the left atrium are described. The aneurysm arose from the left atrial appendage in two patients and from the posterior left atrial wall in one. The aneurysms were characterized by their origin from an otherwise normal left atrium, a well-defined neck, their position within the pericardial space, and distortion of the left ventricular free wall by the aneurysmal body. The differentiation of these structures from other abnormalities of the left atrium are also discussed. Two-dimensional echocardiography is a safe and reliable method for diagnosing congenital aneurysm of the left atrium, and such studies should be considered in any patient with an otherwise unexplained abnormality on the chest radiograph.
Journal of the American College of Cardiology, 1986
A convenient noninvasive method of mapping the left ventricular endocardial surface has been deve... more A convenient noninvasive method of mapping the left ventricular endocardial surface has been developed that can be used to display regional dysfunction and calculate the total area of abnormal endocardial excursion from data obtained in two orthogonal apical and three or more short-axis cross-sectional echocardiographic images. Visually identified regions of abnormal systolic function are plotted on end-diastolic, planar endocardial surface maps, and the extent of dysfunction can be expressed either as an absolute area or as a fraction of the total endocardial surface area involved. The extent of the left ventricular surface moving abnormally, calculated with this echocardiographic mapping technique, was com-Analysis of left ventricular mechanics in patients with ischemic heart disease has shown that both systolic and diastolic performance are determined largely by the area of abnormally functioning myocardium (1-3). In addition, the area of abnormal wall motion or fraction of the total endocardial area moving abnormally is potentially useful as a variable for defining both the natural history of ventricular dyssynergy in acute myocardial infarction and of interventions in the therapy of this ubiquitous problem. Recently a technique was developed in this laboratory for deriving planar maps of the left ventricular endocardial surface from data obtained during routine echocardiographic studies. In a preliminary series of experiments described in a companion article (4), this echocardiographic mapping
Journal of the American College of Cardiology, 1985
Continuous wave Doppler echocardiography has proved useful in detecting and quantitating the high... more Continuous wave Doppler echocardiography has proved useful in detecting and quantitating the high velocity flow disturbances that characterize many stenotic and regurgitant valvular lesions. Pulsed Doppler echocardiography, in contrast, is limited in its ability to quantitate the high velocities that are detected. Recently, new pulsed Doppler systems have been developed that employ high pulse repetition frequencies and can theoretically measure higher flow velocities than those measured by the standard pulsed Doppler systems. To determine the ability of high pulse repetition frequency Doppler echocardiography to accurately measure high velocity flow signals in comparison with the continuous wave method, 80 patients undergoing routine echocardiographic examination for the assessment of valvular heart disease were studied using both techniques. A total of 113 high velocity flow disturbances were detected in 68 patients. In 41 instances, the maximal velocities by the two methods were within 0.5 mls of each other. In 68 of the 113 high velocity lesions, however, the high pulse repetition frequency technique underes-Continuous wave Doppler echocardiography has proved useful in detecting and quantitating the high velocity flow disturbances that characterize many stenotic and regurgitant valvular lesions (1-3). The continuous wave method is limited, however, in that it lacks range resolution and, therefore, cannot precisely localize the site of these high velocity jets (4). Pulsed Doppler echocardiography, in contrast, permits precise determination of the depth from which flow signals originate, but is limited in its ability to quantitate the high From the Cardiac Unit. Massachusetts General Hospital. Boston. Massachusetts.
Early pericardiectomy (PEC) in purulent pericarditis may improve outcome. To assess the use of ec... more Early pericardiectomy (PEC) in purulent pericarditis may improve outcome. To assess the use of echocardiography in the decision for PEC, we reviewed 30 M-Mode and 40 2-D
The two-dimensional echocardiographic features of three patients with congenital aneurysms of the... more The two-dimensional echocardiographic features of three patients with congenital aneurysms of the left atrium are described. The aneurysm arose from the left atrial appendage in two patients and from the posterior left atrial wall in one. The aneurysms were characterized by their origin from an otherwise normal left atrium, a well-defined neck, their position within the pericardial space, and distortion of the left ventricular free wall by the aneurysmal body. The differentiation of these structures from other abnormalities of the left atrium are also discussed. Two-dimensional echocardiography is a safe and reliable method for diagnosing congenital aneurysm of the left atrium, and such studies should be considered in any patient with an otherwise unexplained abnormality on the chest radiograph.
Journal of the American College of Cardiology, 1986
A convenient noninvasive method of mapping the left ventricular endocardial surface has been deve... more A convenient noninvasive method of mapping the left ventricular endocardial surface has been developed that can be used to display regional dysfunction and calculate the total area of abnormal endocardial excursion from data obtained in two orthogonal apical and three or more short-axis cross-sectional echocardiographic images. Visually identified regions of abnormal systolic function are plotted on end-diastolic, planar endocardial surface maps, and the extent of dysfunction can be expressed either as an absolute area or as a fraction of the total endocardial surface area involved. The extent of the left ventricular surface moving abnormally, calculated with this echocardiographic mapping technique, was com-Analysis of left ventricular mechanics in patients with ischemic heart disease has shown that both systolic and diastolic performance are determined largely by the area of abnormally functioning myocardium (1-3). In addition, the area of abnormal wall motion or fraction of the total endocardial area moving abnormally is potentially useful as a variable for defining both the natural history of ventricular dyssynergy in acute myocardial infarction and of interventions in the therapy of this ubiquitous problem. Recently a technique was developed in this laboratory for deriving planar maps of the left ventricular endocardial surface from data obtained during routine echocardiographic studies. In a preliminary series of experiments described in a companion article (4), this echocardiographic mapping
Journal of the American College of Cardiology, 1985
Continuous wave Doppler echocardiography has proved useful in detecting and quantitating the high... more Continuous wave Doppler echocardiography has proved useful in detecting and quantitating the high velocity flow disturbances that characterize many stenotic and regurgitant valvular lesions. Pulsed Doppler echocardiography, in contrast, is limited in its ability to quantitate the high velocities that are detected. Recently, new pulsed Doppler systems have been developed that employ high pulse repetition frequencies and can theoretically measure higher flow velocities than those measured by the standard pulsed Doppler systems. To determine the ability of high pulse repetition frequency Doppler echocardiography to accurately measure high velocity flow signals in comparison with the continuous wave method, 80 patients undergoing routine echocardiographic examination for the assessment of valvular heart disease were studied using both techniques. A total of 113 high velocity flow disturbances were detected in 68 patients. In 41 instances, the maximal velocities by the two methods were within 0.5 mls of each other. In 68 of the 113 high velocity lesions, however, the high pulse repetition frequency technique underes-Continuous wave Doppler echocardiography has proved useful in detecting and quantitating the high velocity flow disturbances that characterize many stenotic and regurgitant valvular lesions (1-3). The continuous wave method is limited, however, in that it lacks range resolution and, therefore, cannot precisely localize the site of these high velocity jets (4). Pulsed Doppler echocardiography, in contrast, permits precise determination of the depth from which flow signals originate, but is limited in its ability to quantitate the high From the Cardiac Unit. Massachusetts General Hospital. Boston. Massachusetts.
Early pericardiectomy (PEC) in purulent pericarditis may improve outcome. To assess the use of ec... more Early pericardiectomy (PEC) in purulent pericarditis may improve outcome. To assess the use of echocardiography in the decision for PEC, we reviewed 30 M-Mode and 40 2-D
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Papers by David Guyer