Search PubMed⌕ Search

Biomedical subjects

K Amplatz

Publications and source records attributed to K Amplatz.

At least 271 records · Page 15Linked to original sources
PubMed1979

An essential view in coronary arteriography.

A significant stenosis of the left main coronary artery is associated with a significant mortality and is one of the major indications for aortocoronary bypass surgery. The diagnosis of this lesion on clinical grounds is inconsistent and should be established by angiography. All routine projections during coronary arteriography cause foreshortening of the left main coronary artery. Well-collimated anteroposterior and shallow right and left anterior oblique views show the main segment best. These views also show the proximal segments of circumflex and anterior descending branches, and should be routinely used during every coronary arteriogram.

Coronary Angiography↗
PubMed1979

Angiographic appearance of post-operative aortic valvar stenosis. Angiographic and haemodynamic correlation.

The classic angiographic appearance of a stenotic aortic valve is that of "dooming". Adequate relief of the obstruction can be obtained with an aortic valvotomy. It should be stressed, however, that even in the absence of an haemodynamically significant gradient, "dooming" of the aortic valve persists over many years and is explained by the presence of an anatomically bicuspid valve.

Adolescent↗
PubMed1979

Pulmonary artery banding in infants with complete atrioventricular canal.

Management of symptomatic atrioventricular canal (AVC) in infancy may be difficult. Between July, 1969, and September, 1977, 31 infants with complete AVC presented in congestive heart failure (CHF) to the University of Minnesota Hospitals. Fifteen of these patients have responded to medical management and have been followed as outpatients. The other 16 patients remained in CHF. Six of them died of persistent heart failure within 4 months. The other 10 infants, aged 3 weeks to 1 year (mean 4 months), underwent pulmonary artery banding and seven survived operation. One of the survivors died with apparent pneumonia 1 month postoperatively. Each of the remaining six patients, who have been followed for 9 months to 9 years, had minimal mitral insufficiency and a large ventricular shunt. The three patients dying after banding had significant mitral insufficiency. We believe that pulmonary artery banding is an effective palliative procedure for infants with complete AVC and CHF who have large ventricular shunts and minimal mitral insufficiency.

Angiocardiography↗
PubMed1979

Computer-aided determination of haemodynamic properties of human heart from cine left ventriculography.

The silhouettes of the left ventricle seen on a cine ventriculogram were used as the graphic input to a pattern analysis programme. The programme measured the coordinates of points around silhouette. It selected the longest chord within the perimeter and determined its length, the area within the perimeter, and the volume of the resulting ellipsoid of revolution. The output from the programme was a global clinical report which included scaled reproductions of the silhouettes, maximum and minimum ventricular volumes, the stroke volume, and the ejection fraction. Local analysis consists in comparison of the contraction profile for the specific patient with the mean pattern obtained from a control group of 24 patients with no myocardial pathology. The graphical and numerical results help in following the progress of disease, in choosing candidates for coronary artery bypass, and in evaluating the results of medical or surgical treatment.

Cineradiography↗
PubMed1978

A variation of scimitar syndrome.

Variations of the scimitar syndrome have been reported previously, the most common being the absence of systemic arterial supply to the right lung and varying degrees of lung hypoplasia. Anomalous scimitar-like veins draining the entire right lung and connecting normally to the left atrium have been reported. The case presented is unique in that there is marked hypoplasia of the right bronchial tree and a large bronchogenic pulmonary cyst without dextroposition of the heart and anomalous systemic arterial supply to the right lung.

Abnormalities, Multiple↗
PubMed1978

Percutaneous transhepatic drainage catheter: a valuable therapeutic aid in obstructive jaundice.

Percutaneous decompression of the biliary system is a useful and well established procedure which can be carried out with negligible risk and may be of great benefit to the patient. The main indications are pre-operative decompression and primarily decompression of patients with inoperable obstructive neoplastic disease. In order to provide drainage, the catheter should be advanced under fluoroscopic control into one of the major radicles ore preferably into the distal common duct beyond the point of obstruction. This ideal internal drainage into the duodenum was accomplished in the reported patient with sclerosing cholangitis who was markedly improved by this procedure.

Catheterization↗
PubMed1978

Which embolic material is best suited for which embolization procedure?

Various embolization cases are described, and these require certain embolization materials. In our experience Gelfoam particles are very well suited for gastrointestinal tract lesions. Ivalon shavings gave excellent results in congenital arteriovenous malformations with permanent occlusions. Bristle brushes are a new device for larger artery occlusion. Stainless steel coils in combination with silk tufts proved thrombosis of large AV fistuals or of aneurysms particularly of the splenic artery.

Abdominal Injuries↗
PubMed1978

Complications of wedge hepatic venography.

During wedge hepatic venography, mechanical injection should be accomplished at the lowest possible rate in order to avoid hemorrhagic infarction. Small amounts of contrast material should be administered. Hepatic angiography may result in an area of tumor blush at the site of a previous wedge injection.

Animals↗
PubMed1978

Experimental observations on short and long-term effects of arterial occlusion with Ivalon.

Ivalon sponge has proved to be a useful embolic material, particularly when long-term or permanent occlusions are desirable. It has been stated that Ivalon is well tolerated and that it produces little if any damage to the wall or periadventitial tissues of the embolized artery. Our study demonstrates definite evidence of inflammatory reaction in the wall of the embolized arteries; these changes were seen only in the acute phase and seem to be secondary to damage of the vessel wall by the plastic material. Permanent occlusion results with disappearance of the inflammatory changes at nine months postembolization.

Animals↗
PubMed1978

Selective transcatheter embolization of the upper gastrointestinal tract: an experimental study.

Transcatheter gastric embolization using Ivalon shavings was performed on three groups of dogs. The left gastric artery and splenic branches (the short gastric and left gastroepiploic arteries) were embolized in Group I, the left gastric artery in Group II, and the splenic branches in Group III. Infarctions of the gastric mucosa occurred only in Group I. Ischemic ulcers developed in three of the five dogs in Group I and in one of the three dogs in Group II. The study suggest that embolization can only be performed safety if particles of 0.3 mm or larger are used.

Animals↗
PubMed1978

Correlation between intracoronary 201Tl myocardial scanning, coronary angiography and left ventriculography.

One hundred and six patients with angina pectoris who underwent routine coronary angiography and left ventriculography were given intracoronary injection of thallium 201. The myocardial images had excellent resolution because of lack of interference from the background activity. The myocardial images and the left ventriculograms showed 94% correlation. Correlation between scans and EKG was lower. There was no correlation between the degree of coronary artery stenosis and 201Tl scan. Currently, the intracoronary injection of 201Tl at rest does not yield additional information to coronary angiography and left ventriculography.

Adult↗
PubMed1978

Development of a method of evaluating cardiac performance using interactive computer graphics.

The authors discuss an objective method of analyzing local wall motion to detect and measure the pattern of contraction of the left ventricle using computer graphics. The method's advantages include: (a) the use of modular hardward and software, which can be extended and upgraded; (b) a minimal expenditure of time and money; (c) uniformly calculated results; and (d) a graphic and legible report.

Computers↗
PubMed1978

Nonsurgical treatment of splenic-artery aneurysms.

Splenic-artery aneurysms are commonly found incidentally during abdominal angiography. Because approximately 10% of these aneurysms may rupture and lead to fatal hemorrhage, surgical treatment is indicated. A new, nonsurgical approach is described in which the splenic-artery aneurysm is packed with foreign matter introduced through a catheter to induce thrombosis. The procedure can be carried out under local anesthesia and is the preferred technique in high-risk patients. As more experience is gained with this procedure, it can be performed on an elective basis under local anesthesia and the patients can be spared the disadvantages of laparotomy.

Aged↗
PubMed1978

The "swinging" tube: a new concept.

A new technique converts a standard biased x-ray tube into a microfocal spot tube with a clinically useful loading capacity. If the tube is pivoted exactly through the focal spot, the film can be scanned with a 5-10 cm wide beam and cover a 17-inch field. Then the target angle can be decreased to a few degrees. The width of the focal spot can be decreased using a grid bias.

Radiography↗
PubMed1978

The use of the bristle brush for transcatheter embolization.

Small nylon brushes with a stainless steel core have been found safe and effective for transcatheter arterial occlusion. Studies performed in 14 dogs demonstrate the brushes result in rapid occlusion of the renal artery. Follow-up studies for periods up to ten months document the safety and permanence of the occlusion. The animal studies reported herein suggest that these devices can be safely used in humans in cases where large artery occlusion is desired.

Animals↗
PubMed1978

A new, simple test for renin sampling.

In 8 of 18 patients with suspected diagnosis of renovascular hypertension, the resting renin values were inconclusive. However, following tourniquet stress, the values became positive. Sixteen of 18 patients showed significant decrease in blood pressure following surgery. The procedure was well tolerated, and its routine use is recommended.

Adolescent↗