A new device for the safe delivery of stainless steel coils.
A new device for the safe delivery of the Gianturco stainless steel coils is described, which can be selectively placed in a predetermined area.
Catheterization↗
Biomedical subjects
W Castaneda-Zuniga
Publications and source records attributed to W Castaneda-Zuniga.
A method to analyze the motion of the endocardium during contraction.
Regional segmental wall motion analysis assumes a linear or radial grid system. In this study, motion patterns of points on the canine endocardium were evaluated. Radiopaque endocardial and epicardial markers were inserted along the anterior and posterior descending coronary arteries. Postoperative cine radiography showed that the endocardial markers did not move along either linear or radial grids. The endocardial and epicardial markers were shown to have different patterns of movement.
Animals↗
The angiographic appearance of intrarenal leiomyoma.
Two benign leiomyomas are described together with their radiographic and sonographic appearance, and the literature is reviewed. In large, asymptomatic renal masses, which are well circumscribed on angiography, a benign intrarenal leiomyoma may be considered. Nonechogenicity and relatively good through-transmission seem to substantiate the diagnosis.
Angiography↗
Renal artery aneurysms: an angiographic sign of transplant rejection.
Intrarenal arterial aneurysm is an uncommon manifestation of allograft rejection. We present two cases of transplant rejection with aneurysm formations. One case simulated polyarteritis nodosa, while in the other, the aneurysm appeared similar to those seen in post-stenotic arterial dilatation.
Adult↗
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↗
Lung metastases from synovial sarcoma simulating granulomas.
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Adult↗
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↗
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↗
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↗
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↗
Hemodynamic assessment of obstructive aortoiliac disease.
Angiographic demonstration of obstructive aortoiliac disease is of paramount importance prior to surgery. Obstructive disease in the femoral popliteal system can only be surgically relieved if inflow is adequate. Severely stenotic lesions may be missed by angiography due to the oblique course of the iliac arteries and inability to obtain right angle views. Translumbar downstream catheterization of the abdominal aorta and puncture of both femoral arteries allows simultaneous pressure recordings. The injection of 30 mg of papaverine into the femoral artery assures maximal vasodilatation mimicking conditions under exercise. A minimal gradient at rest may become obvious following the injection of papaverine, indicating hemodynamically significant disease and warranting surgical correction. The technique has proved to be simple and valuable, and there have been no complications.
Aorta, Abdominal↗
Percutaneous intravascular biopsy using a Simpson atherectomy catheter: technical note.
The design of the Simpson atherectomy catheter makes this device a potentially safe and technically easy tool to obtain adequate pathologic intravascular or intraluminal specimens. The risk of perforation should be low, but this use has to be further studied. We describe the first intravascular biopsy performed with the Simpson catheter.
Arteriosclerosis↗
Experimental myocardial infarction in the closed-chest dog: a new technique.
The reliable and safe production of myocardial infarction in closed-chest animals is of paramount research interest. To date, the injection of particulate matter and the introduction of occlusive solid plugs have been described. Because of the limited size of the catheter, only small branches could be occluded, which resulted in a high incidence of mortality. A new simple technique is described that allows occlusion of a major coronary artery at a preselected site. An Ivalon (polyvinyl alcohol) plug compressed around the tip of an introducing wire is advanced through a selectively placed catheter into the coronary artery. It is felt in place for 5 minutes and assumes its original size upon contact with blood. Once the plug is re-expanded, the wire is withdrawn. The new technique was carried out successfully on nine dogs with no immediate fatality and myocardial infarction as demonstrated by cine ventriculography and histopathologic examination.
Animals↗