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Biomedical subjects

K Amplatz

Publications and source records attributed to K Amplatz.

At least 253 records · Page 14Linked to original sources
PubMed1980

Therapeutic blockade of arteries using compressed Ivalon.

A new technique for embolization with compressed Ivalon plugs is described. Fourteen arteries--six renal, three splenic, two pulmonary, one left gastric, and two abdominal aortas--were occluded in six dogs. In one case of renal artery embolization, three plugs were used, and in one case of abdominal aorta embolization, two were needed for total occlusion. In all other cases only one plug was used. Total occlusion was angiographically demonstrated up to five months following embolization in all but one case. In this case, recanalization was thought to have occurred because of overcompression of the Ivalon plug.

Animals↗
PubMed1980

Changerless peripheral angiography: a new concept.

The authors describe a new technique using the principle of rotational scanography, in which the x-ray tube is rotated through the center of the focal spot and scans the field of interest. A single primary and secondary slot system in conjunction with an 8:1 grid is used for efficient scatter removal. If the speed of blood flow is increased by reactive hyperemia and a large amount of contrast medium is injected, the abdomen to the toes can be scanned with one injection. The advantages of this technique are that a 127-cm field can be covered with a 6 degree or 12 degree target tube and without an especially high ceiling, and the film changer is eliminated. The angiograms are markedly improved because virtually all scatter is eliminated, and exposure is reduced since only one radiograph is necessary.

Angiography↗
PubMed1980

Routine magnification lymphangiography with a swinging slot X-ray machine.

Bilateral pedal lymphangiography was performed in 85 patients. Anteroposterior, lateral, and oblique views of the pelvis and abdomen were obtained with conventional radiographic technique and compared with 1.8 X magnification views obtained with a radiographic scanner that had a multiple slot system and with magnification views obtained with a standard 0.3-mm focal spot and a 12:1 grid.

Humans↗
PubMed1980

Persistent truncus arteriosis associated with interruption of the aortic arch.

Five patients with a combination of truncus arteriosus and interruption of the aortic arch are reported. The combination of those defects significantly increases the surgical risk. This rare cardiac malformation can only be diagnosed radiographically. An aberrant right subclavian artery is present in 25% of patients. It is helpful in suspecting the diagnosis from plain films of the chest. The diagnosis can be made from a ventriculogram, but usually a truncogram is necessary to define the anatomy of the aortic arch.

Adolescent↗
PubMed1980

Vascular pseudotumors of the kidney.

Eleven cases of vascular pseudotumors were reviewed and grouped into four categories according to clinical and radiological findings. On the IVP we found two patterns of filling defects: [1] Smooth indentations or filling defects in AV fistulas and renal artery aneurysms and also in the case of a congenital AV malformation due to an enlarged draining vein. [2] Multiple mottled filling defects caused by collaterals in stenoses of renal artery branches. This appearance is also described in the literature for congenital AV malformations. The angiographic findings in each of the four categories are discussed. The role of angiography is stressed as the diagnostic test of choice to establish the correct diagnosis of these benign lesions and to define optimal treatment.

Adult↗
PubMed1980

Accessory flaplike tissue causing ventricular outflow obstruction.

In three cases, two in children and one in a young adult, ventricular outflow obstruction was caused by a valvelike flap of accessory endocardial tissue. The angiocardiographic feature was that of a narrow radiolucent, crescent-shaped or linear filling defect corresponding to the site of obstruction. Resection of the accessory tissue was performed in each case at the time of correction of associated conditions. In one case (a woman 20 years of age) the obstructing membrane was in the outflow tract of the right ventricle, and a ventricular septal defect was associated. In each of the other two cases the outflow tract of the left ventricle was the site of obstruction. In one (a 14-month-old boy), an ostium primum type of atrial septal defect and cleft mitral valve were associated; in the remaining case (a 7-year-old boy) complete transposition and ventricular septal defect were also present. In the latter case a Mustard procedure was performed and was followed by death. Successful results were obtained in the first two patients.

Adult↗
PubMed1979

Angiographic appearance of leiomyomas of the small intestine: report of two cases.

Benign and malignant smooth muscle tumors of the small intestine have each been considered as displaying distinct angiographic characteristics. However, as two cases illustrate, the angiographic features of benign and malignant smooth muscle tumors overlpa, and radiographic differentiation of these tumors is not feasible. In most cases angiography can distinguish smooth muscle tumors from other vascular lesions.

Aged↗
PubMed1979

Plasma lipoproteins and coronary arteriography in subjects in the program on the surgical control of the hyperlipidemias. Preliminary report.

Coronary arteriographic findings, plasma lipid and lipoprotein levels, and cigarette smoking history are reported for the first 101 male post myocardial infarction survivors who have been entered into the POSCH clinical trial. Estimates of the extent of stenosis in the major coronary arteries were made using 4 models ranging from a simple determination of the number of the 3 major vessels having significant (i.e. 50% or greater stenosis) disease to more complex methods of determining overall extent of disease in 14 major segments of the coronary arteries. Age was shown to be an important factor in the extent of vessel disease. When controlling for age, plasma cholesterol and LDL-cholesterol levels were shown to be related to the extent of disease, especially in Type II hyperlipoproteinemia subjects. Multiple linear regression analysis demonstrated that age and LDL-cholesterol had positive associations and HDL-cholesterol had an inverse association with the coronary artery disease indices. In this comparatively "healthy" subgroup of the overall population of first MI survivors the major CHD risk factors are limited to plasma lipids and cigarette smoking. This preliminary report of 10% of the recruitment objective of the project supports the currently held views of the lipid--atherosclerosis hypothesis regarding the effects of age-total plasma cholesterol, LDL--cholesterol, and HDL--cholesterol on the extent of coronary atherosclerotic plaques, as determined by coronary arteriography.

Adult↗
PubMed1979

Lymphangiography and ultrasound in management of lymphoceles.

Recent reports describe the efficacy of ultrasound in the diagnosis and management of lymphoceles. To assess the appropriate role of ultrasound and lymphangiography in the management of this entity, we reviewed our experience with 14 cases diagnosed as lymphoceles. Three patients had lymphangiography alone, 5 had lymphangiography and ultrasound, and 6 had ultrasound alone. Our analysis concludes that both diagnostic modalities have a role in management depending on the size of the lymphocele and the associated clinical setting.

Cysts↗
PubMed1979

Coarctation of the abdominal aorta.

Coarctation of the abdominal aorta is an uncommon process but an important cause of systemic hypertension. Angiography is the investigation of choice to establish a diagnosis and document the extent of involvement. However, angiography does not provide an etiological diagnosis; and it may not be possible to distinguish an acquired coarctation from a congenital process. Three patients with coarctation of the abdominal aorta are presented.

Adolescent↗
PubMed1979

Nonsurgical removal of intravascular foreign bodies.

With increasing use of indwelling venous catheters, embolization of intravascular catheter fragments has become a well-known complication. Because of the high risk and serious complications, embolized fragments should be retrieved whenever possible. Four cases of successful nonsurgical percutaneous catheter retrieval (two adults and two children) are described using a wire loop and a hook-shaped catheter technique. The method described allow a safe and rapid retrieval and should always precede surgical exploration.

Aged↗
PubMed1979

Doming of the pulmonary valve after valvotomy.

Doming of the pulmonary valve is considered an important angiographic sign for valvar stenosis. But, this sign cannot be used with similar specificity following valvotomy because at the time of surgery a bicuspid valve is created. Pre- and postoperative hemodynamic data and right ventriculograms are reviewed in 22 patients with simple pulmonary valvar stenosis. There was no correlation between the transvalvar gradient and appearance of the pulmonary valve after surgery.

Angiocardiography↗
PubMed1979

Radiological evaluation of composite aortic grafts.

Aneurysm of the ascending aorta with aortic regurgitation is most commonly caused by cystic medial necrosis. Replacement of the aortic valve and diseased aorta with a composite graft and re-implantation of coronary arteries is the surgical treatment of choice at the authors' institution. The most important late complication of this procedure is hemorrhage at the anastomotic sites. Radiology plays an important role in the management of these patients. The angiographic appearance of cystic medial necrosis and the radiological features and postoperative complications of composite grafts in 15 patients are described.

Adolescent↗
PubMed1979

The "ring sign" of necrotic pheochromocytoma.

Pheochromocytomas are usually hypervascular tumors exhibiting dense stain during angiography. The cystic nature of the neoplasm or tumor necrosis can result in failure of opacification of the mass or a central lucent area. Four cases of pheochromocytoma are described where a central avascular zone was surrounded by a dense rim of contrast, giving a "ring sign." Since this appearance is best seen in the capillary and venous phases, delayed films are essential.

Adolescent↗
PubMed1979

Therapeutic embolization of facial arteriovenous fistulae.

Two cases of percutaneous transfemoral embolization of facial hemangiomas and arteriovenous (AV) malformations are reported. In both cases, Ivalon shavings were injected through a percutaneously placed catheter to permanently occlude peripheral feeders of the AV malformation. In one case, because of the size of the large venous sacs associated with the malformation, a steel coil was introduced to form a baffle, over which several additional strands of surgical silk were introduced to obliterate these sacs. These cases emphasize the need for embolization of small feeding arteries to prevent recurrence by collateral channels. To achieve this, specific-sized emboli are necessary; Ivalon is a suitable embolic material.

Adult↗
PubMed1979

Giant aneurysms of the renal arteries: an unusual manifestation of fibromuscular dysplasia.

Diffuse areas of narrowing and dilatation involving the main renal artery are the most common angiographic findings in fibromuscular dysplasia (FMD), together with the presence of renal artery stenosis. The development of false aneurysms of the renal artery and arteriovenous fistulas are uncommon manifestations. Large, partially thrombosed and calcified renal artery aneurysms are described and their differential diagnosis is stressed.

Adult↗