Marvin Dunn
College of Health Sciences, Bahrain
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Marvin Dunn.
American Journal of Cardiology | 1979
Bert Y.S. Wong; Jay Murphy; C.Joseph Chang; Khatab Hassenein; Marvin Dunn
The risk and potential risk factors of pericardiocentesis were assessed by a review of a series of 52 pericardiocenteses comprising all those performed in the cardiac catheterization laboratory of one institution from 1971 to 1978. On the basis of the operative results, the patients were separated into two groups for comparison; Group I comprised all patients with a successful uncomplicated (35) pericardiocentesis and Group II all those with a nonproductive (16), nontherapeutic (1) or complicated (8) pericardiocentesis. Complications consisted of one death, one cardiac arrest, one aspiration of a subdiaphragmatic abscess and five ventricular punctures without adverse sequelae. Among the patients who had a nonproductive pericardiocentesis, the condition of 11 had probably been misdiagnosed but at least 4 had a false negative pericardiocentesis. Comparison of the two groups showed no significant difference in the incidence of cardiac tamponade or in the clinical presentation based on historical, physical, electrocardiographic, roentgenographic or echocardiographic findings of pericardial disease. Pericardiocentesis was usually successful when performed for suspected malignant pericardial effusion but often unsuccessful when performed for suspected hemopericardium. Anatomically, all patients in Group II had either minimal or loculated posterior pericardial effusion. It is concluded that pericardiocentesis can be performed at a low risk that can be further minimized by consideration of the disease process and the anatomic location of the pericardial fluid.
American Journal of Cardiology | 1977
Bert Y.S. Wong; Robert Rinkenberger; Marvin Dunn; Allan Goodyer
The effect of left bundle branch block on left ventricular performance was studied in a patient with rate-dependent left bundle branch block and an otherwise normal heart. The timing of left heart events, hemodynamic pressures and indexes of left ventricular contractility were determined during normal intraventricular conduction and during left bundle branch block. The results indicate that in the normal heart left bundle branch block has no significant effect on left ventricular performance.
American Heart Journal | 1979
Gian Luigi Nicolosi; David M. Pugh; Marvin Dunn
Eighty-seven patients (64 females and 23 males) with mitral stenosis were studied by M-mode echocardiography to assess the sensitivity and the specificity of the echocardiographic technique in the identification of valve calcification. The mitral valves were examined at operation, and the amounts of calcium were graded as heavy, light, or absent. We compared this with the amount of calcification assessed by radiographic, previously accepted echocardiographic, and newly derived echocardiographic criteria. In identifying the presence or absence of valve calcification, radiography was the least sensitive (53.7 per cent), but the most specific (90.9 per cent) technique, and has the highest predictive accuracy (90.6 per cent). Previously accepted echocardiographic criteria had the highest sensitivity (92.6 per cent), but the lowest specificity (12.1 per cent), and the lowest predictive accuracy (63.3 per cent). The newly derived echocardiographic parameter MT/ST (ratio between the maximal thickness of the left ventricular margin of the interventricular septum) was both sensitive (75.9 per cent) and specific (81.8 per cent) and also had a predictive accuracy (87.2 per cent) similar to that of radiographic techniques. The MT/ST ratio is demonstrated to be the most useful non-invasive method for assessing valve calcification in mitral stenosis.
American Journal of Cardiology | 1977
James E. Carley; Bert Y.S. Wong; David M. Pugh; Marvin Dunn
Among 68 patients with mitral insufficiency who had right and left cardiac catheterization and left ventriculography, 6 had retrograde transmission of the left atrial V wave into the main pulmonary artery. All of these patients had mitral insufficiency of acute onset. The remaining 62 patients had chronic mitral insufficiency that was considered severe in 17. Pulmonary vascular resistance was lower in the group with acute insufficiency (mean 139 dynes sec cm-5) than in the group with chronic severe insufficiency (mean 631 dynes cm-5) (P less than 0.005). Nondistensibility of the left atrium and low pulmonary vascular resistance were the two factors favoring retrograde transmission of V waves. Because both factors are present in acute mitral regurgitation, this finding is helpful in differentiating patients with acute mitral insufficiency.
American Heart Journal | 1986
John F. Best; K.M. Hassanein; David M. Pugh; Marvin Dunn
Over the years the Starr Edwards prosthesis has demonstrated a high durability and improved survival in patients with severe aortic stenosis or insufficiency. While the ideal valve prosthesis is not yet available, the Starr-Edwards valve in most instances demonstrates an adequate hemodynamic performance, does not degenerate throughout the human life span, is biocompatible, and is inserted reliably without requiring unique technical dexterity. Despite occasional valve-related complications with early models, beneficial effects of valve replacement are clearly seen in patients with a reversible myocardial dysfunction, a lower level New York Heart Association functional class (II to III), and who survive the early postoperative period and the first year. Long-term complications seen with the Starr-Edwards valve are primarily thromboembolism, endocarditis, hemolysis, and anticoagulation related complications. Despite good operative results, the major cause of deaths in these patients remains cardiac.
Chest | 1986
Glenn D. Goldstein; Marvin Dunn
Une femme de 82 ans souffrant de palpitations, de dysphagie et de faiblesse musculaire a developpe une eruption persistante sur le visage, le cou et le dos des mains ayant conduit au diagnostic de dermatomyosite
American Heart Journal | 1988
Timothy Blackburn; Marvin Dunn
Chest | 1979
Douglas B. Bogart; Barry L. Murphy; Bert Y.S. Wong; David M. Pugh; Marvin Dunn
Chest | 1976
Barry L. Meyer; Douglas B. Bogart; James E. Carley; Bert Y.S. Wong; Marvin Dunn
Chest | 1978
Bert Y.S. Wong; Douglas B. Bogart; Marvin Dunn