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Biomedical subjects

W Castaneda-Zuniga

Publications and source records attributed to W Castaneda-Zuniga.

At least 55 records · Page 3Linked to original sources
PubMed1982

Left-sided anomalies in Ebstein's malformation of the tricuspid valve.

A review of 34 autopsied cases with classical Ebstein's malformation of the tricuspid valves revealed 8 cases with left-sided anomalies. Among these, appearing in 1 case each, were aortic atresia and persistent common atrioventricular canal. The latter 2 conditions were dominant clinically. In the remaining 6 cases the left-sided anomalies were not apparent clinically and probably of no functional significance. These conditions were parachute mitral valve, bicuspid aortic valve, cor triatriatum and pulmonary stenosis, cleft mitral valve, stenosis of individual pulmonary veins, and prolapse of mitral valve.

Adolescent↗
PubMed1982

Tardokinesia: definition and clinical occurrence.

Tardokinesia is an abnormal slowness of contraction of a region of the left ventricular (LV) wall. This concept was stated in quantitative terms and used for analyzing LV regional wall motion. Forty-four consecutive patients from the case stream of the Cardiovascular Radiology Service were chosen, and their cine left ventriculograms were studied. A polar grid of thirty radii, at twelve degree increments, was superimposed on the tracing of each ventricle. The wall motion was measured at thirty points, and the location, speed, and acceleration of each point in each cine was calculated. Two cases of tardokinesia were found. Tardokinesia might be a sensitive or early indicator of ischemic heart disease.

Adult↗
PubMed1982

Sources of artifacts in rotational scanography.

The images produced in rotational scanography, currently under investigation at several institutions, may contain several kinds of artifacts. The sources of such artifacts are: 1. vertical and horizontal misalignment of the focal spot with the axis of rotation; 2 misalignment of the primary and secondary slits; 3 a density gradient due to slit cut-off; 4 vibration of the x-ray tube during rotation; 5. A density gradient due to variation in motor speed; 6. radiographic striations due to ripple of the tube output. Striations are present even if a 12-pulse generator is used, but they disappear if a constant potential generator is employed.

Humans↗
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↗
PubMed1981

Signs of membranous subaortic stenosis appearing after correction of persistent common atrioventricular canal.

Two cases are presented of persistent common atrioventricular (A-V) canal with interventricular communication in which associated membranous subaortic stenosis became apparent only after correction of the basic malformation and replacement of the mitral valve. The features of the membranous subaortic stenosis present only after operation were a left ventricular outflow pressure gradient and angiocardiographic demonstration of the membrane. In one case, additional echocardiograms demonstrated systolic flutter of the aortic cusps after the first operation (no echocardiograms were taken preoperatively). The flutter disappeared after a second operation in which the subaortic membranous tissue was resected. The appearance of hemodynamic signs of subaortic stenosis after the corrective operation for the persistent common A-V canal is explained by the fact that preoperatively the interventricular communication allowed decompression of the left ventricle so as to preclude a left ventricular outflow gradient. It is presumed that the use of additional angiocardiographic projections might have demonstrated the anatomic state preoperatively.

Adolescent↗
PubMed1981

The three types of criss-cross heart: a simple rotational anomaly.

Criss-cross heart is an angiographically confusing malformation where apparent crossing but not mixing of contrast medium is seen at atrioventricular level. The malformation can be understood by a clockwise or counter-clockwise ventricular rotation. In the normal heart or one with complete transposition ventricular rotation is clockwise. With corrected transposition rotation occurs in a counter-clockwise fashion. One case of criss-cross heart with associated corrected transposition and two criss-cross hearts occurring with complete transposition are reported.

Heart↗
PubMed1981

Isolation of a subclavian artery.

Eight patients with isolation of a subclavian artery are described. Isolation of subclavian artery is defined as a loss of continuity between the subclavian artery and aorta but with persistent connection to the homolateral pulmonary artery through a ductus arteriosus. The connecting ductus arteriosus may or may not be patent. As the pulmonary vascular resistance is usually lower than the systemic resistance, the isolated subclavian artery is perfused by subclavian steal, and if the connecting ductus arteriosus is patent, flow occurs from the subclavian artery into the pulmonary artery. In this material and in all reported cases, isolation of subclavian artery has always been associated with other anomalies of the aortic arch, such as right aortic arch or bilateral ductus. Its frequent association with intracardiac defects, usually the tetralogy of Fallot, makes its recognition clinically important. Thoracic aortography with delayed filming is the only procedure that allows consistent diagnosis of this rare anomaly during life.

Child, Preschool↗
PubMed1980

Noninvasive localization of the aortic arch in infants with tracheoesophageal fistula: an experimental study.

For surgical treatment of patients with tracheoesophageal fistulas the localization of the aortic arch is great practical importance. Aortography and CT scanning have been advocated as the radiographic techniques of choice. The location of the aortic arch can be diagnosed on a chest x-ray by the deviation of the trachea alone. A barium swallow is not required. The optimal radiographic technique for this purpose was investigated in phantom studies and tested in animals and newborns. It is proposed that in addition to the standard chest x-ray a high kvp film with hardened beam (1 mm copper -- 1 mm aluminum) be added in order to demonstrate the tracheal deviation. The additional x-ray exposure to the infant is negligible; and the technique is simple, reliable, and noninvasive.

Animals↗
PubMed1980

An unusual aberrant left subclavian artery.

In a child with tetraology of Fallot, pulmonary atresia, and right aortic arch, the left subclavian artery arose from an unusually low position, and was initially misinterpreted as a systemic pulmonary collateral. This anomaly probably resulted from a "lag" in embryological migration of the left subclavian artery onto the aortic arch.

Abnormalities, Multiple↗
PubMed1980

Cystic arterial adventitial degeneration.

Cystic degeneration of the adventitia is a rare entity occurring most commonly in the popliteal artery: only a few cases involving the external iliac, femoral, radial, and ulnar arteries have been reported. The authors describe 2 cases, one of which appears to be the first report of the disease in the external iliac artery in a child.

Adolescent↗
PubMed1980

Angiographic findings in recanalization of coronary arterial thrombi.

Four patients with atherosclerotic disease were found to have a recanalized coronary arterial thrombus on angiography. The functional significance of this finding varied. In 2 cases, flow (judged by collaterals) was insignificant in spite of the recanalization. In the other 2, collateral supply had been shown to be absent during the initial stage of thrombosis. In one case, recanalization was confirmed pathologically.

Adult↗
PubMed1980

Embolization of multiple pulmonary artery fistulas.

Therapeutic embolization of pulmonary arteriovenous fistulas is described as an alternate method of treatment for patients with diffuse pulmonary involvement in whom resection is not feasible.

Arteriovenous Malformations↗
PubMed1980

Nonsurgical aortoplasty in Leriche syndrome.

The abdominal aorta was dilated with a pair of 9-mm balloon catheters in a patient with Leriche syndrome. The bilateral pressure gradient, initially 60 mm Hg, disappeared even after papaverine was injected. Balloon dilatation of the abdominal aorta may be an effective, safe nonsurgical technique, particularly in localized, noncalcified atheromata, and does not carry the risk of impotence seen with surgical endarterectomy or bypass.

Aorta, Abdominal↗
PubMed1980

In vivo radiographic appearance of the St. Jude valve prosthesis.

The St. Jude valve prosthesis has radiopaque leaflets which can be seen by cinefluoroscopy to determine their in vivo movement. Laboratory and clinical experience with visualization of various components of the prosthesis is described.

Evaluation Studies as Topic↗
PubMed1980

Coronary sinus-left atrial window.

Left atrial-coronary sinus fenestration is a rare cause of a left-to-right or right-to-left shunt which occurs most commonly with a persistent left superior vena cava. These fenestrations may represent the only pathway for an obligatory right-to-left or left-to-right shunt in atrioventricular valve atresia. Four cases are presented.

Abnormalities, Multiple↗
PubMed1980

Scanography with rotation of the radiographic tube: a new method.

The quality of the radiographic image is compromised by secondary radiations and geometric unsharpness, which is proportional to the focal spot size. The authors describe a new system which significantly improves both elimination of scatter and reduction of the apparent focal spot size and gives superior radiographs to those made with a conventional x-ray machine. Advantages of the new system include (a) the lack of resolution and density gradients across the radiograph, (b) increased contrast due to descreased scatter, (c) increased resolution, (d) possible routine radiography with a 100-mu focal spot, (e) up to 2.5 x magnification, (f) increased acceptable kVp range, and (g) decreased dose to the patient.

Humans↗