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Biomedical subjects

M Viamonte

Publications and source records attributed to M Viamonte.

At least 55 records · Page 3Linked to original sources
PubMed1978

Portosystemic communications studied by transhepatic portography;.

The experience of collecting 120 transhepatic portograms, performed in patients with different degrees of portal hypertension, affords the opportunity for discussing the anatomical and hemodynamic features of portosystemic communications. Multiple pathways of decompression were found. The coronary-gastroesophageal collateral formed pathways in 108 cases, other major collaterals in 41, and minor collaterals in 2. This multiplicity of communications suggests that no one vessel is indispensable as a collateral pathway.

Collateral Circulation↗
PubMed1978

Fluoroscopically guided thin needle aspiration biopsy of the abdomen and retroperitoneum.

The results of 49 transabdominal and translumbar thin needle percutaneous aspiration biopsies in patients suspected of having malignant disease are reported. A correct diagnosis was obtained in 40 cases. Placement of the Chiba needle was accomplished by fluoroscopically controlled biplane radiography during constrast examinations. No complications were encountered. The technique allows cytologic diagnosis of malignancy without high risk exploratory surgery, prolonged hospitalization, or delay of treatment. Use of fluoroscopic needle guidance and biplane radiography for confirmation of position using various contrast examinations as markers is felt to be superior to either CT or ultrasound. The technique is readily available in all radiology departments.

Abdominal Neoplasms↗
PubMed1978

Relief of malignant obstructive jaundice by percutaneous insertion of a permanent prosthesis in the biliary tree.

Twelve patients with malignant obstruction of the biliary tree were treated by dilating the lesion percutaneously and inserting an internal large-bore teflon prosthesis in place bridging the the stricture. All 12 patients had unresectable neoplasms. The procedure was devised because existing modes of palliation using surgical techniques are associated with significant mortality or mobidity. There are also many problems with nonsurgical catheter drainage. Decompression was achieved in all 12 patients as shown radiographically by passage of contrast into the duodenum. Disappearance of pruitus was achieved in seven of seven patients, and in 10 of 12 disappearance of jaundice (bilirubin, before prosthesis, 18.4 +/- 4.5 mg/dl [mean +/- 1 SD], bilirubin 1 month after prosthesis, 1.8 +/- 0.6 mg/dl [mean +/- 1 SD], P less than 0.001) with improvement of general clinical status was achieved. Percutaneous placement of a permanent biliary tract prosthesis is safe and effective for the palliative decompression of malignant biliary tract obstruction.

Adenoma, Bile Duct↗
PubMed1978

Computed tomography of the thorax.

Computed tomography of the chest is found to be a useful method in selected cases. Lipomas of the chest and mediastinum can be specifically diagnosed. Extent of malignant pulmonary processes can be assessed for resectability, since it can detect mediastinal nodes not properly seen in conventional chest tomography. Computed tomography of the chest is indicated in these two diagnostic problems.

Aged↗
PubMed1977

New techniques for interruption of gastroesophageal venous blood flow.

Enlarged gastroesophageal veins were successfully obliterated in 41 patients using embolization with modified autogenous clots and/or Gelfoam, balloon occlusion, iatrogenic perivenous hematoma, sclerosing agents (Sotradecol and Keflin), or a combination of these methods. Thirteen patients were actively bleeding when studied, and the site of bleeding was detected in 4. Surgical exploration of 16 patients and autopsy study of 5 showed persistent obliteration ranging between three weeks and seven months. No major complications requiring reparative surgery were encountered. Gelfoam soaked with Sotradecol is the preferred agent because it provides persistent obliteration of the embolized veins. Patients who are acutely bleeding or have done so previously are candidates for selective obliteration of the gastroesophageal veins.

Catheterization↗
PubMed1977

Pitfalls in transhepatic portography.

Difficulties commonly encountered in transhepatic catheterization of the portal vein and interpretation of portograms are discussed. A long-sleeved trocar is recommended. Curved guide wires and deflector assemblies may assist in superselective catheterization of the tributaries of the portal vein. The judicious use of embolic material (small volumes, slowly injected) should guarantee the success and safety of this technique. Transhepatic obliteration of the gastroesophageal veins is a relatively simple and usually successful form of palliative treatment for actively bleeding and stable gastroesophageal varices. Thoroughness of the embolization procedure and of interruption of blood flow in the gastroesophageal veins is necessary to prevent early recurrence of bleeding.

Catheterization↗
PubMed1977

Transhepatic obliteration of gastroesophageal varices: results in acute and nonacute bleeders.

Seventy-three patients with hepatic cirrhosis and bleeding gastroesophageal varices underwent transhepatic portal vein catheterization and variceal obliteration. Gastroesophageal varices were successfully obliterated in 32 patients actively bleeding and in 35 patients with stabilized bleeding gastroesophageal varices. The remaining six were technical failures. Follow-up examinations in 10 patients from 1 month to 3 years later showed persistent obliteration of embolized veins. Recurrence of variceal bleeding occurred in nine patients. This method should be considered as a palliative, effective adjuvant to the medical treatment of patients with bleeding gastroesophageal varices.

Acute Disease↗
PubMed1977

Some aspects of mediastinal anatomy and radiology.

High kilovoltage technique in chest radiography increases the visualization of the air-soft tissue boundaries of the mediastinum. The pulmonary-soft tissue interfaces account for pre- and paravertebral lines. The paravertebral and pleural-azygos-esophageal, central, posterior, and anterior lines of pleural contact are described, and displacement, deformities, and separation of the pleural reflections are illustrated.

Humans↗
PubMed1977

[Renal pancreatic venous anastomosis: anatomical, clinical and radiological study].

Abnormalities in the left urinary tract have been observed secondary to pancreatopathies. Venous connections between the distal spenopancreatic venous bed and the left adrenal-renal venous system have been demonstrated by cast corrosion technique and by radiographic studies in the cadaver. In all of our anatomic studies, except on one occasion, numerous venous connections between the portal and systemic veins were demonstrated. The intravenous pyelogram and particularly nephrotomography have great value when pathology of the body and/or tail of the pancreas is suspected. Indirect sign on the left renal vein thrombosis on the left side may suggest the presence of a pancreatopathy. With acute and chronic pancreatitis, pseudocyst of the pancreas, and pancreatic carcinomas, we have noticed changes in the left urinary tract.

Adolescent↗
PubMed1976

Percutaneous cholangiography with the Chiba University needle: a new, safe, and accurate method in the diagnosis of cholestatic syndromes.

A modified technique of percutaneous transhepatic cholangiography utilizing the Chiba University needle is described. This new technique employs injection of dye through a thin flexible 22 gauge needle with a short bevel while it is slowly withdrawn under a fluoroscopic monitoring. The results of several investigators are reviewed and indicate that failure to visualize the biliary radicals with the Chiba University needle virtually rules out extrahepatic obstruction. It is anticipated that this technique will replace the traditional sheathed needle cholangiography as a diagnostic modality in the evaluation of the jaundiced patient.

Cholangiography↗
PubMed1976

Report of the Inter-Society Commission for Heart Disease Resources. Optimal resources for examination of the chest and cardiovascular system. A hospital planning and resource guideline. Radiologic facilities for conventional x-ray examination of the heart and lungs. Catheterization-angiographic Laboratories. Radiologic resources for cardiovascular surgical operating rooms and intensive care units.

This is an updated and expanded planning and oprimal resource guideline for diagnostic examinations of the cardiovascular system. Catheterization-angiographic laboratories are described and detailed specifications given for radiologic and physiologic equipment. Case loads for maintaining safe and effective performance are recommended and complication rates discussed. An optimal location for the laboratory is defined and the status of affiliated laboratories reviewed. Professional staff qualifications, relationships and requirements are enumerated and recommendations are made for organization and administration of the services. There is a protocol for electrical safety and radiation protection and a data base for assessing case loads in hospitals within a community or region. This statement also defines optimal facility and equipment criteria for conventional chest x-rays and radiologic equipment requirements for cardiovascular surgical operating rooms and intensive care units.

Angiocardiography↗
PubMed1976

An angiographic approach to hepatobiliary diseases.

Abdominal aortography and celiacomesenteric angiography preceded or followed by cholangiography and portography provide the most comprehensive approach and thorough angiographic evaluation of hepatobiliary-pancreatic diseases. Transhepatic catheterization and subsequent embolization of gastroesophageal veins are of great value in actively bleeding, as well as in stable, varices. Exit embolization of the needle tract minimizes the possibility of the leakage of blood or of bile.

Angiography↗