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Biomedical subjects

R Burgos

Publications and source records attributed to R Burgos.

At least 55 records · Page 3Linked to original sources
PubMed1990

Cerebral metastasis from angiosarcoma of the heart. Case report.

A case of secondary cerebral angiosarcoma in a 30-year-old man is presented. The patient had previously undergone heart transplantation for treatment of the primary tumor. Only a few cases of cerebral metastasis from angiosarcoma have been recorded in the literature; the present case is the first reported case diagnosed after heart transplantation.

Adult↗
PubMed1989

Outlet-strut fracture and disc embolization in 27-mm and smaller Björk-Shiley convexo-concave valves: historical overview and 3 case reports.

Outlet-strut fracture leading to primary failure of Björk-Shiley convexo-concave disc valves has only recently been reported in valves of 27-mm size and smaller. We now report an additional 3 cases of outlet strut failure in smaller convexo-concave valves, in a series of 899 implantations (overall incidence, 0.33%) of convexo-concave valves in various sizes and in 2 variant opening angles (60 degrees and 70 degrees ), during a 6-year period. All failures were confined to lots implanted during 1981 and 1982. We describe these 3 cases within the context of an historical overview of the Björk-Shiley tilting-disc valve, and propose methods of surgical intervention when this life-threatening complication arises.

Journal Article↗
PubMed1985

Rewarming rate of the myocardium during aortic cross-clamp time: variations with different levels of body hypothermia.

Twenty patients underwent elective cardiac valve replacement at 20 degrees C of body hypothermia. Temperatures of the ventricles of both walls were monitored on 12 different sites. Distribution of myocardial temperature ranged between 24.3 and 29.3 degrees C for patients of Group I before cardioplegia delivery and 13.2 degrees C in the septum after cardioplegic infusion. Average temperatures for the anterior and posterior wall were 13.6 C and 15 degrees C in the left ventricle and 14.7 and 15 degrees C in the right ventricle. Myocardial temperatures ranged from 26 to 28.7 degrees C for patients of Group II. After cardioplegic arrest, septal temperatures averaged 14.9 degrees C. The recorded sites of the anterior and posterior left ventricle were 14.1 and 13.1 degrees C. The effects of rewarming on the different myocardial areas occurred according to a logarithmic equation, which is faster in the first 10 minutes. The data suggest that the myocardium can be adequately protected with 25 degrees C hypothermia when the cross-clamp period is shorter than 60 minutes. When longer ischemic periods are expected, myocardial protection is best accomplished with 20 degrees C hypothermia.

Journal Article↗
PubMed1984

Long-term results of cardiac valve replacement with the Delrin-disc model of the Björk-Shiley valve prosthesis.

One hundred two Björk-Shiley valve prostheses with the Delrin-disc occluder were implanted in 83 patients between January, 1971, and July, 1972. Fifty-eight were in the mitral position, 42 in the aortic, and 2 in the tricuspid. Complete follow-up until 1981 was obtained in 93% of the patients (mean follow-up, 66.8 months). Hospital mortality was 18% and late mortality, 19%. Survival according to actuarial methods was 84.8% at 5 years and 78.1% at 9 years after operation. Thromboembolism was detected in 8.8% of patients but caused no deaths. The incidence was 1.2% and 1.5% per year in those patients treated with Coumadin and antiplatelet agents, respectively. Reoperation was necessary in 13% of the patients. Most survivors (72%) are in New York Heart Association Functional Class I, despite a preoperative status of Class III or IV in 57% of the patients. Hospital mortality may be due to poorer understanding of patient management and less refined techniques of myocardial protection. Long-term survival with this prosthesis is similar to that in more recent studies, and rates of thromboembolism and malfunction compare favorably with other prosthetic valves.

Adolescent↗
PubMed1983

Comparative electrophysiological evaluation of atrial activation and sinoatrial node function following Senning and Mustard procedures: an experimental study.

We compared several electrophysiological variables before and after Mustard and Senning procedures in 14 mongrel dogs and made the following three observations. First, after the Senning operation, the atrial activation in the areas of the anterior and middle internodal tracts is undamaged. After the Mustard procedure, however, conduction through the interatrial septum is practically abolished. Both techniques damage the area of the posterior internodal tract. On the whole, there is greater dispersion of atrial epicardial mapping with the Senning operation. Second, several degrees of depression in the sinus node automatism and intraatrial conduction were observed with both techniques. Third, atrioventricular block in various degrees was observed only after the Mustard procedure. The atrioventricular dissociation observed after the Senning operation was dependent on sinus pacemaker dysfunction only. We think that from the electrophysiological point of view, the Senning procedure is a valid alternative for repair of transposition of the great arteries.

Animals↗
PubMed1983

Paroxysmal nodal reentrant tachycardia. Surgical cure with preservation of atrioventricular conduction.

In a patient with repetitive disabling tachycardias refractory to pharmacologic treatment, the electrophysiologic study suggested the existence of atrioventricular nodal reciprocating tachycardia. During ventricular pacing, endoepicardial mapping of the lower atrium showed the atrial breakthrough point in an area of the lower interatrial septum close to the AV node crista. A selective atriotomy was performed. The postoperative electrophysiologic studies showed absence of ventriculoatrial conduction at several ventricular pacing rates, while antegrade conduction is preserved. The patient remained free of arrhythmias 21 months after surgery, taking no antiarrhythmic drugs.

Atrioventricular Node↗
PubMed1983

Sequential quantitative joint scintigraphy in the investigation of anti-inflammatory effects of piroxicam.

Ten patients with rheumatoid arthritis were given piroxicam in a single daily dose of 20-40 mg for 16 weeks. The average number of painful joints decreased from 16.7 to 4.0. Similar reductions were seen in the number of inflamed joints and number of tender joints. Scintigraphic study of the patients revealed a clear reduction in 99TC uptake suggesting significant anti-inflammatory activity of the drug.

Anti-Inflammatory Agents↗