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Biomedical subjects

K Amplatz

Publications and source records attributed to K Amplatz.

At least 199 records · Page 11Linked to original sources
PubMed1982

Systemic-to-pulmonary collaterals in pathological states: a review.

Abnormal systemic-to-pulmonary-artery anastomoses can exist in many pathological conditions and result in a left-to-right shunt. Three such conditions are (a) congenital abnormalities, e.g., pulmonary vein atresia, (b) acquired states, e.g., chronic bronchiectasis, and (c) post-surgical states, e.g., a Mustard procedure for complete transposition. Regardless of the etiology, the anastomosis and resulting shunt produce increased oxygen saturation in the ipsilateral pulmonary artery. Four cases are presented, with emphasis on the angiographic and hemodynamic findings.

Adult↗
PubMed1982

Endovascular diathermic vessel occlusion.

The feasibility of endovascular diathermic vessel occlusion (EDVO) is demonstrated in canines. The technique was standardized by measuring current flow through a monopolar intravascular electrode. Between 150 and 350 mA were applied to a spider-shaped intravascular electrode producing venous occlusion without perivascular damage. With further refinements in instrumentation, EDVO holds promise as a quick, safe method of therapeutic vascular occlusion that may eventually be applied clinically for spermatic vein occlusion.

Animals↗
PubMed1982

Ivalon shavings: technical considerations of a new embolic agent.

Ivalon (polyvinyl alcohol sponge) shavings can be used as a permanent embolic material. When injected as a suspension with assorted particles of proper size, congenital arteriovenous malformations can be cured, eliminating the need for surgical excision.

Adolescent↗
PubMed1982

The site of arterial wall rupture in transluminal angioplasty: an experimental study.

The site of arterial rupture following arterial balloon dilatation was studied in postmortem canine arteries. An atherosclerotic plaque was simulated by insertion of a solid nylon ball. Longitudinal tears of intima and media were produced at the level of the nylon ball. The site of arterial rupture can therefore be predicted if localized changes of wall strength can be neglected. On the other hand, the site of arterial rupture in clinical cases will depend mainly on the consistency and tensile strength of the diseased artery.

Angioplasty, Balloon↗
PubMed1982

Work in progress. Transcatheter thermal venous occlusion: a new technique.

Diatrizoate (76%) contrast agent heated to 100 degrees C was injected into the veins of dogs and one human volunteer for the nonsurgical occlusion of the vessels. Follow-up venograms and histologic examinations, at intervals varying from one day to four weeks later, revealed thrombosis of the injected veins in all animals. Thrombosis occurred one to five days after injection of contrast agent. The authors conclude that hot contrast medium is a safe and convenient agent for inducing thrombosis. It is much easier to use than mechanical devices, tissue glues, and plastics, which involve complex procedures and specialized equipment. In contrast to other sclerosing agents, hot contrast agent is rapidly converted into a nonsclerosing agent by cooling. The new technique allows a more controlled thermal injury to the vascular wall and is under fluoroscopic control.

Animals↗
PubMed1982

Nephrostolithotomy: percutaneous techniques for urinary calculus removal.

Recently the technique of percutaneous nephrostomy has been modified to allow the percutaneous extraction of urinary calculi. This communication describes experience with the percutaneous extraction of 63 calculi from the urinary tract. An overall success rate of 87%, a low incidence of complications (about 3%), a fast recovery, and sooner return to work are obtained. Several technical variants including grasping, fragmentation, flushing, and removal under direct vision have been used. In most cases, a combination of the different techniques has to be used in one patient. Essential to the technique is the introduction of large dilators into the kidney.

Dilatation↗
PubMed1981

Angiodysplasia of the right colon treated by embolization with ivalon (polyvinyl alcohol).

Angiodysplasia of the colon is being recognized with increasing frequency as a source of lower gastrointestinal bleeding in the elderly. In one patient with colonic angiodysplasia, superselective segmental embolization of the ileo-colic artery with Ivalon resulted in the cessation of bleeding without causing bowel infarction. However, because of the development of collateral branches to the angiodysplastic malformation, bleeding recurred. While colectomy remains the treatment of choice in younger patients, in high risk patients embolization with a permanent embolic material, such as Ivalon, is an attractive alternative.

Aged↗