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Biomedical subjects

D H Bennett

Publications and source records attributed to D H Bennett.

At least 91 records · Page 5Linked to original sources
PubMed1980

Unmodified ECT.

Explore the source record for details and available documents.

Electroconvulsive Therapy↗
PubMed1980

Implantation of atrial synchronous pacemaker with transvenous electrodes after surgery for hypertrophic subaortic stenosis.

An atrial synchronous ventricular pacemaker was implanted in a patient with hypertrophic subaortic stenosis who developed permanent complete atrioventricular block during left ventriculomyotomy and myectomy. In spite of partial amputation of the right atrial appendage, performed during cannulation for cardiopulmonary bypass, a transvenous pacing lead with a helically coiled tip was easily attached to the remnant of the appendage and satisfactory atrial sensing was achieved.

Cardiomyopathy, Hypertrophic↗
PubMed1978

Identical twins with differing forms of ventricular pre-excitation.

Identical 10-year-old twins, both with electrocardiograms showing a short PR interval and a normal QRS complex but with dramatically different electrophysiological characteristics, are described. One twin experienced episodes of rapid palpitation and on one occasion was resuscitated from ventricular fibrillation. An intracardiac electrophysiological study confirmed the presence of an atrioventricular nodal bypass tract and in addition revealed the presence of an accessory atrioventricular pathway, thus demonstrating that the patient had both the Lown-Ganong-Levine and Wolff-Parkinson-White syndromes. Re-entry tachycardia and atrial fibrillation, with a very rapid ventricular rate, were precipitated. After treatment with amiodarone, the patient became asymptomatic and a repeat study showed that the features of the atrioventricular nodal bypass tract were no longer present and though re-entry tachycardias using the accessory atrioventricular pathway could still be induced, their rates were slower than before treatment. The other twin, in spite of an identical surface electrocardiogram, was asmymptomatic. An electrophysiological study showed the features of an atrioventricular nodal bypass tract but there was no evidence of additional atrioventricular accessory connections and a tachycardia could not be induced.

Amiodarone↗
PubMed1978

Social deviance in a day hospital.

A search was made of records available for 65 nonpsychotic patients referred to a psychiatric day hospital. Assessments were made of whether they had shown various specified types of deviant social conduct, such detailed objective surveys of social conduct being regarded as superior to the use of concepts such as "psychopathic personality". The correlational structures of the areas of deviance produced four factors, i.e. deviant family roles, poor social integration, violence, and a more heterogeneous antisocial behaviour factor. The relationship was examined between areas of deviance and indices of the course and outcome of day hospital admission. The prognostic significance of social deviance was different for men and women; for example, only men showed a correlation between the number of areas of social deviance and the outcome of day hospital admissions. Violence and poor social integration showed no relation to outcome at all. It is suggested that there is no basis for excluding such patients from day hospitals on the assumption that they are less likely to be helped than other non-psychotic patients.

Antisocial Personality Disorder↗
PubMed1978

Disopyramide in patients with the Wolff-Parkinson-White syndrome and atrial fibrillation.

The effect of administration of disopyramide on the ventricular response to atrial fibrillation was studied in six patients with the Wolff-Parkinson-White syndrome. The drug was given intravenously to five patients during intracardiac electrophysiologic studies and to a sixth patient during electrocardiographic monitoring in a coronary care unit. One patient with a very rapid ventricular response to atrial fibrillation underwent a second electrophysiologic study after oral treatment for four weeks with disopyramide. In all cases, administration of disopyramide reduced the mean ventricular rate and increased the shortest interval between consecutive preexcited ventricular complexes during atrial fibrillation. Therapy with disopyramide should therefore be useful in preventing ventricular fibrillation which can result from a rapid ventricular response to atrial fibrillation in patients with an accessory atrioventricular pathway. There has been no recurrence of paroxysmal tachycardia in the four patients who have been maintained on oral therapy with disopyramide.

Adult↗
PubMed1977

Previous occupational stability as a predictor of employment after psychiatric rehabilitation.

Several indices of occupational stability are discussed and the importance of controlling for age in assessing occupational stability emphasized. The ability of 6 indices to predict the stable resettlement of psychiatric patients at work after a course of rehabilitation was examined. Though mean job length was a significant predictor, indices based on change of occupation rather than change of job were more successful. Stable resettlement at work was related to how much time people had spent in long jobs but not to how little time they had spent in short jobs. The amount of unemployment during the 2 years before hospital admission predicted return to work immediately after discharge, but did not predict stable resettlement at work.

Age Factors↗
PubMed1977

Valvar aortic stenosis with unusual features.

This case report documents the co-existence of valvar aortic stenosis and hypertrophic obstructive cardiomyopathy with systemic hypertension and calcific mitral annulus, a combination which has not hitherto been reported. It is the purpose of this paper to help assess the true incidence of the co-existence of aortic stenosis and hypertrophic cardiomyopathy.

Aged↗
PubMed1977

Effects of instructions, biofeedback, and cognitive activities on heart rate control.

In a factorial experiment, 90 male and 90 female subjects were given (a) either instructions to increase heart rate (HR), decrease HR, or no instructions to change their HR; (b) either true biofeedback, false biofeedback, or no biofeedback; and (c) either instructions concerning cognitions to help them change HR or no instructions concerning cognitions. The results indicated that (a) for increasing HR, instructions to increase HR were as effective as the combination of instructions and true biofeedback; (b) for decreasing HR, neither instructions nor biofeedback nor the combination of instructions and biofeedback was more effective than simply sitting quietly; (c) although subjects instructed to increase HR showed higher HRs at the end of training than subjects instructed to decrease, the increase subjects showed a decline in HR from the initial period; (d) almost all subjects reported using cognitions to influence HR, and instructions concerning the use of cognitions did not facilitate changes in HR; and (e) women showed higher HRs, which declined more slowly than those of men, but sex did not interact with any treatment variable. It was concluded that increases (or retarded decreases) in HR were due to instructions, and decreases were due to simple adaptation, thus raising serious questions concerning the effectiveness of the biofeedback component of "biofeedback training" for altering HR.

Biofeedback, Psychology↗
PubMed1976

Echocardiographic assessment of mitral valve calcification.

The mitral valve was assessed by echocardiography in 20 patients, aged 27 to 67 years, who subsequently underwent mitral valve replacement. After removal, the mitral valve cusps were examined by direct measurement, radiography, and quantitative calcium extraction. Increased thickness of the E-F echo was found where calcification or fibrosis was present, differentiation by echocardiography alone being unreliable. However, multiple dense parallel E-F echoes were found in all 10 patients with more than 80 milligrammes of calcium in the valve, while a single thin E-F echo indicated the absence of significant calcification or fibrosis.

Adult↗
PubMed1976

Test of reliability of echocardiographic estimation of left ventricular dimensions and volumes.

This test is based on the incompressibility of myocardium, which dictates that left ventricular wall volume remains constant throughout the cardiac cycle. The volumes occupied by the left ventricular cavity, by ventricular wall plus cavity, and hence by ventricular wall alone were estimated, both at end-systole and at end-diastole, from ecocardiographic measurements of cavity transverse dimension and wall thickness. Wall volumes were determined by assuming an ellipsoid shape (the major axis being predicted from aggression equations relating angiocardiographic and echocardiographic cavity dimensions) and also by the cube method. A discrepancy between systolic and diastolic wall volume estimates indicates either that the measurements of ventricular dimensions were unreliable or that the assumptions of ventricular geometry involved in the volume calculations were incorrect. Studies were made on 60 subjects. Using the ellipsoid formula, values for wall volume ranged from 66 to 719 ml; systolic and diastolic wall volumes correlated closely (r = 0-96, mean difference = 6-8 +/- 0-9 (SEM) %) supporting the reliability of the echocardiographic dimensions and estimates of cavity and wall volume. In the 12 patients with very large end-diastolic cavity transverse dimensions (6-5 to 8-6 cm) however, correlation was less good (r - 0-81, mean difference = 14-3 +/- 2-3 (SEM) 5). Using the cube method, which does not allow for the changing relation between minor and major cavity axes with increasing cavity size, wall volumes were greater (76 to 986 ml) but correlation was similar (r = 0-94, mean difference = 7-1 +/- 0-9 (SEM)%). Having established that it is possible to obtain close agreement between wall volumes determined at different points in the cardiac cycle, this test can be used to assess the reliability of echocardiographic left ventricular dimensions and volume estimates in individual subjects.

Adolescent↗
PubMed1975

Influence of denial (situation redefinition) and projection on anxiety associated with threat to self-esteem.

Subjects in a threat condition were informed that they had failed an important test while subjects in a nonthreat condition were not told that they had failed. To manipulate the use and timing of coping strategies for dealing with threat, subjects were told to (a) redefine the nature and importance of the test before receiving feedback, (b) redefine the nature and importance of the test after feedback, or (c) estimate the performance of their friends on the test (i.e., project) after receiving feedback. Repeated measures of subjective anxiety and pulse rate indicated that (a) the threat manipulation was effective in increasing stress, (b) redefinition occurring before the onset of threat was effective in eliminating stress, and (c) redefinition occuring after the onset of threat was ineffective in reducing stress. Projection reduced the report of subjective anxiety. The results revealed factors that influence coping strategy effectiveness and resolved conflicts in previous findings.

Adolescent↗
PubMed1975

Echocardiographic left ventricular dimensions in pressure and volume overload. Their use in assessing aortic stenosis.

Left ventricular 'relative wall thickness', determined from the ratio between echocardiographic measurements of end-systolic wall thickness and cavity transverse dimension, was related to peak systolic intraventricular pressure in 15 normal subjects, in 15 patients with left ventricular volume or pressure overload without aortic stenosis, and in 23 patients with aortic stenosis. All these patients had a mean rate of circumferential fibre shortening greater than 1.0 circumference per second and were regarded as having good ventricular function. Relative wall thickness was found to be normal in cases of volume overload and to be increased in pressure overload, being proportional to the systolic intraventricular pressure. Values for the ratio of systolic intraventricular pressure to relative wall thickness in the normal subjects and patients without aortic stenosis were similar (mean 30 +/- 2.5). Based on this relation, estimates of peak systolic intraventricular pressure were made in the cases of aortic stenosis using the formula: systolic intraventricular pressure (kPa) equals 30 x wall thicknes divided by transverse dimension. Peak systolic aortic value gradients derived by subtracting brachial artery systolic pressure, measured by sphygmomanometer, from the echocardiographic estimates of intraventricular pressure compared favourably with the gradients measured at left heart catheterization (r equals 0.87, P less than 0.001). Aortic value orifice areas, derived from echocardiographic estimates of stroke volume, ejection time, and value gradient, ranged from 0.21 to 3.16 cm2 and appeared to correlate with the severity of aortic stenosis. All patients with aortic stenosis, with or without coexistent mild aortic regurgitation, who were recommended for aortic valve surgery, had estimated valve orifice areas of less than 0.8 cm2. A further 10 patients with pressure or volume overload had mean rates of circumferential fibre shortening of less than 1.0 circumference per second and were regarded as having poor ventricular function. In these cases values for relative wall thickness were lower than in those with good ventricular function and were not proportional to systolic intraventricular pressure. In patients with good left ventricular function systolic intraventricular pressure is proportional to, and can be estimated from, echocardiographic measurement of relative wall thickness.

Adolescent↗