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Biomedical subjects

H N Neufeld

Publications and source records attributed to H N Neufeld.

At least 127 records · Page 7Linked to original sources
PubMed1981

Correction of tetrad of Fallot with reduced incidence of right bundle branch block.

In 20 patients who underwent a modified surgical repair of tetrad of Fallot complete right bundle branch block developed in only 8 (40 percent). Standard and intraoperative conduction studies indicated that in these patients the right bundle branch block was due to injury of the right bundle branch near the ventricular septal defect (proximal right bundle branch block). The modified operative technique is aimed at minimizing the injury to the right ventricle and it includes a significantly shorter than usual ventriculotomy incision and avoidance of the septal (moderator) band during infundibulectomy. Intra- and postoperative hemodynamic studies of these patients revealed that relief of the right ventricular outflow obstruction was optimal.

Adolescent↗
PubMed1981

Subaortic stenosis: an unrecognized problem in transposition of the great arteries.

Right ventricular (subaortic) obstruction has only rarely been described in complete transposition of the great arteries. five patients with complete transposition of the great arteries in whom subaortic stenosis was angiocardiographically demonstrated were studied. All had a pressure gradient of 30 to 55 mm Hg across the aortic outflow tract. Two of the patients manifested mild tricuspid insufficiency, and another two had coarctation of the aorta. The etiologic, anatomic, hemodynamic and prognostic aspects of this unusual anomaly are discussed. An angiocardiographically demonstrated series of this anomaly has not been reported on before.

Angiocardiography↗
PubMed1981

Normal mean manifest electrical qRS in dysplastic pulmonary valve associated with hypertrophic non-obstructive left ventricular cardiomyopathy.

Dysplastic pulmonary valve is usually associated with extreme right axis deviation. A mean manifest electrical QRS axis of + 160 degrees or less was present in 11 of 30 cases of DPV studied by us. In 9 of these cases associated left ventricular hypertrophic non-obstructive cardiomyopathy was found. We suggest that a normal mean manifest electrical QRS axis in the presence of dysplastic stenotic pulmonary valve indicates the presence of associated cardiomyopathy.

Adolescent↗
PubMed1981

Correlation between cardiac catheterization and echocardiography in assessing the severity of mitral stenosis.

During a 12-mth period 162 consecutive patients with mitral stenosis underwent examination by M-mode as well as cross-sectional echocardiography. The mitral valve area was measured by cross-sectional echocardiography ad the severity of mitral stenosis by M-mode echocardiography. Out of the total, 69 patients underwent left and right heart catheterization and in 53 of these the mitral valve area was calculated. A correlation of r=0.92 for the mitral valve area was found between sector scan echocardiography and cardiac catheterization, whereas the correlation between M-mode echocardiography and catheterization yielded a result of only r=0.38. Thus the assessment of the severity of mitral stenosis by cross-sectional echocardiography is a reliable alternative to cardiac catheterization.

Cardiac Catheterization↗
PubMed1981

Coronary arterial pattern in superoinferior ventricular heart. Implications on significance of morphogenesis of this anomaly.

The coronary arterial pattern was studied in two patients with superoinferior ventricular heart and haemodynamically complete transposition. In one of them the aorta was dextro-positioned and in the other laevo-positioned. In both the right coronary artery arose from the posterior aortic sinus and the left coronary artery from the left aortic sinus. This pattern is similar to the common coronary arterial pattern in complete transposition of the great arteries. The similarity supports the theory that in the superoinferior ventricular heart the connections between the ventricles and the great arteries (concordant or discordant) area those of the basic condition--complete transposition or corrected transposition. The angiocardiographic findings indicate that relations are not always as expected for a given connection.

Child, Preschool↗
PubMed1981

Interruption of the aortic arch with complete transposition of the great arteries. Clinical and angiocardiographic diagnosis at the age of one day.

The association of complete transportation of the great arteries and complete interruption of the aortic arch is very rare. This combined lesion was diagnosed clinically in a 1-day-old infant in whom it caused cyanosis of the upper half of the body. The diagnosis was confirmed angiocardiographically. We believe this is the youngest patient in whom this diagnosis was made in vivo.

Aorta, Thoracic↗
PubMed1981

Uninterrupted inferior vena cava with azygos continuation.

Azygos continuation of the inferior vena cava is diagnosed in infants in the presence of obstruction to flow in the inferior vena cava due to infrahepatic interruption. Recently we studied in an infant complex congenital heart disease in which there was azygos continuation of the inferior vena cava without infrahepatic interruption or any other obstructive lesion of this vessel. The blood from the lower part of the body drained into the right atrium by two wide patent veins: the inferior vena cava and the azygos system. The angiocardiographic observations of this condition in an infant are reported for the first time to our knowledge, and the embryologic development is briefly reviewed.

Azygos Vein↗
PubMed1980

A semi-automatic device for pacemaker function analysis.

An external semi-automatic Pacemaker Function Analyzer (PFA) has been designed for routine examination (screening) of ambulatory-paced patients in general medical practice. The evaluation of the pacemaker (PM) function is based on recognition, decoding, and measurement of the occurrence of QRS complexes and pacing artifacts, and on logic processing of the decoded data. In this way, the state of the batteries and the integrity of the electronic circuitry and the electrodes can be determined. Other PFA applications concern supervision of hospitalized patients by interfacing the analyzer with the monitoring system of a Coronary Care Unit (CCU), transtelephone checking, and adaptation for use in specialized pacemaker clinics. The performance of the PFA was checked on 92 ambulatory patients. The PFA system recognized all but 0.29% of the QRS complexes and 0.21% of the pacing artifacts. Thirty-two of these patients were tested simultaneously by the PFA and the pacemaker clinic physician, both arriving at the same results. Twelve hospitalized patients were monitored in the CCU, after permanent PM implantation, for an average of 4 hours per patient. Although the PFA indicated 5% false-negative alarms for the hospitalized patients, it should be stressed that every true PM failure was promptly detected. It is anticipated that routine use of the PFA for management of paced patients will reduce the expenses incurred by frequent visits, as well as simplify the follow-up and surveillance of ambulatory and hospitalized patients, thereby facilitating the work of the medical staff.

Coronary Care Units↗
PubMed1980

Closed pulmonary valvotomy in infants under 6 months of age: report of 14 consecutive cases without mortality.

Fourteen infants, all under 6 months of age, underwent surgery for the relief of severe valvar pulmonary stenosis. A modified Brock (transinfundibular valvotomy) procedure was performed in all cases. Dilatation of the pulmonary valve with a mosquito clamp and biliary dilator is the basis of the modified operation. All infants survived the operation. In two patients there is residual, significant pulmonary stenosis, and in two additional cases pulmonary regurgitation is present.

Female↗