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Biomedical subjects

C R Joyner

Publications and source records attributed to C R Joyner.

At least 37 records · Page 2Linked to original sources
PubMed1976

The displacement cardiograph. A noninvasive technique for recording myocardial wall motion.

The displacement cardiograph (DCG) is a noninvasive device employing an electromagnetic field to record tissue motion within the body. The sensing coil need not be in contact with the patient since the field penetrates air and stationary tissue without significant distortion. Disturbances in the field with result from ventricular wall motion are electronically converted to an analog output and a pattern inscribed on the paper of a physiological recorder. In an attempt to determine the reliability of the DCG in detecting regional areas of abnormal left ventricular wall motion, displacement cardiograms were obtained from 70 patients who underwent cardiac catheterization and left ventriculography. The DCG interpretations were in agreement with the ventriculographic picture of left ventricular wall motion in 67 of the 70 patients. There were two false positive and one false negative DCG diagnoses. The results indicate that the DCG can be employed as a reliable noninvasive method for repetitive assessment of the pattern of contraction of the anterior, anterolateral and posterior left ventricular wall.

Cardiomyopathies↗
PubMed1976

Familial myxomas in four siblings.

Familial myxomas of the heart are very rare, with only two previous reports noted in the literature. This report documents four siblings with myxomas, and three of these patients had two or more myxomas. One sibling had four myxomas excised. The clinical findings, history, examination, and surgical treatment are described.

Adult↗
PubMed1975

Echocardiography.

We have discussed the evolution of selected areas of echocardiography in an attempt to illustrate the capabilities and limitations of this method of study. As information has accumulated, some concepts of the specificity of certain echocardiographic patterns have had to be revised. Awareness of the potential for false positive and false negative results has increased rather than decreased the usefulness of the echo method. Equipment deficiencies which existed in past years have largely been corrected, thereby reducing the likelihood of repeating some of the earlier mistakes. Two years ago, we suggested that more patients with left ventricular disease should be studied, the results from different laboratories should be compared, a large number of patients with congenital disease should be evaluated, and the limitations of the technic be more precisely defined. Obviously much has been accomplished in all of these areas. Much more can be done. There is every reason to believe that the next few years will bring many new and important developments in diagnostic echocardiography.

Cardiac Output↗
PubMed1975

Termination of atrial flutter and atrial tachycardia with rapid atrial stimulation.

The results in this series of fifty-seven patients confirms the safety and reliability of rapid atrial stimulation to terminate atrial flutter and atrial tachycardia. Transthoracic wires implanted at thoracotomy or transvenously placed atrial electrodes can be used for the confident intracardiac electrocardiographic diagnosis of tachyarrhythmias and for atrial stimulation. Our experience represents the second largest reported series of patients to undergo cardioversion by this method. In all but five of fifty-seven patients either the atrial tachyarrhythmia was converted to normal sinus rhythm or the flutter-tachycardia was terminated with resultant atrial fibrillation. In forty-three patients sinus rhythm was eventually re-established after atrial stimulation. Various aspects of rapid atrial stimulation, including it's preference over precordial shock, have been discussed. We feel particular consideration should be given cardioversion by rapid atrial stimulation in patients with possible digitalis toxicity and in all patients who have atrial flutter, atrial tachycardia, or junctional tachycardia after open heart surgery.

Aged↗
PubMed1975

Transcutaneous Doppler detector in the study of arterial and venous flow patterns.

The transcutaneous Doppler flow detector is not presently suited for volume quantitation. However, the arterial flow velocity profile has been established as a valuable procedure for the diagnosis of peripheral arterial disease and assessment of abnormalities of peripheral flow that may result from cardiac arrhythmia or cardiac dysfunction. Distinctive, diagnostic arterial flow patterns in patients with hypertrophic subaortic stenosis and in patients with aortic insufficiency have been described. Occlusive venous disease in the popliteal vein and more proximal vessels can be diagnopsed with an accuracy that justifies the use of the Doppler ultrasound examination as a screening procedure in individuals subject to thrombophlebitis. It is reasonable to anticipate that future work with pulsed Doppler instruments will establish this technique of imaging as a practical clinical method for noninvasive arteriography.

Arrhythmias, Cardiac↗
PubMed1975

Cardiac tamponade complicating percutaneous catheterization of subclavian vein.

Cardiac tamponade has not been reported previously as a complication of central venous pressure (CVP) monitoring catheters inserted via the percutaneous subclavian vein approach. In one patient perforation of the vein by the catheter resulted in the catheter lying free in the mediastinum. Deterioration of the patient prompeted increasing infusion of fluids through this catheter with incresing cardiac compression. Relief was obtained after a thoracotomy. Ti is suggested that this complication may be recognized in the future and corrected without thoracotomy if radiopaque dye is infused through the CVP catheter.

Cardiac Tamponade↗
PubMed1972

Echocardiography.

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Echocardiography↗