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Biomedical subjects

M Villegas

Publications and source records attributed to M Villegas.

31 records · Page 2Linked to original sources
PubMed1991

Two dimensional and Doppler echocardiographic diagnosis of bicuspid pulmonary valve.

The diagnosis of bicuspid pulmonary valve is usually established postmortem, occurring in 7% of patients with pulmonary stenosis and is usually associated to tetralogy of Fallot or ventricular septal defect. The authors report the case of a 14-year-old girl with patent ductus arteriosus in whom 2-D echocardiography disclosed a pulmonary valve formed of two slightly thickened leaflets that opened with the shape of a dome in systole, and moved under the valve ring plane during diastole. A Doppler examination showed a 21 mmHg transvalvar gradient. These characteristic features suggest that 2-D and Doppler echocardiography are the techniques of choice in the diagnosis of bicuspid pulmonary valve.

Adolescent↗
PubMed1990

Sexual behavior of Colombian high school students.

This paper presents the results of a survey on the sexual behavior of Colombian high school students. It documents significant gender differences in the sexual behavior of Colombian adolescents as compared with the more egalitarian sexual behavior of their American and European counterparts. The study indicates that prostitutes are playing a decreasing role in the sexual lives of Colombian males as a result of a trend toward premarital coital permissiveness among Colombian females. The findings also support previous studies which indicate that there are intrinsic gender differences in the intensity and frequency of sexual desire.

Adolescent↗
PubMedDate not supplied

[Detection of early occlusion of aortocoronary by-passes. Usefulness of a non-angiographic method].

A total of 83 bypasses were studied. Angiographic results demonstrated occlusion in 3 of 24 bypass of internal mammary artery placed in the anterior descending artery, 2 in the right coronary artery, 1 in the posterolateral of the circumflex and 1 in the first diagonal branch, with a total occlusion average of 8.4% within the first 8 days. We found a good correlation between the coronarographic angiograms and the positivity or negativity of the echo-electrocardiographic tests, during atrial pacing. We believe that this simple method could be done routinely in all the patients after coronary surgery, to decide the need of a new coronary angiogram. Furthermore, this study shows that the occlusion of a single coronary bypass does not produce myocardial infarction, detectable by enzymatic measures or by resting EKG. This method also detects the early post-operatory sinus sick syndrome.

Adult↗
PubMedDate not supplied

[Doppler color transesophageal echocardiography. Report of the first 110 studies carried out at the Ignacio Chávez National Institute of Cardiology].

Transesophageal echocardiography allows views of the posterior structures of the heart. This approach provides additional and complementary information to the transthoracic study, it is also an alternative in those patients with technical limitations for optimal precordial imaging. This study analysis the first 110 cases studied with transesophageal echocardiography in the National Institute of Cardiology Ignacio Chávez. They correspond to patients with valvular heart disease, prosthesis, acute and chronic ischemic heart disease, dissecting aortic aneurysm, cardiomyopathies, thrombus, tumors and masses. As well as paediatric and adult with complex congenital heart disease. The advantages of the transesophageal technique compared with the precordial approach are described.

Adolescent↗
PubMedDate not supplied

[Partial pericardial tamponade immediately after cardiac surgery].

Partial pericardial tamponade is a critical situation frequently misdiagnosed. We describe five patients with this entity during an urgent surgical reintervention performed few hours after the initial one. We found clots compressing cardiac cavities in all, usually in the right atrium. In one of them we found also a clot compressing the left atrium. None of the patients studied had the classical clinical features of cardiac tamponade (Kussmaul's sign: pulsus paradoxus) and we found no difference in blood pressure, quantity of bleeding or pulmonary capillary pressure, considering the reinterventional moment in comparison to the values taken immediately after the initial surgery and the ones registered during the surgical reintervention. There was significative increase in the central venous pressure value, decreased urine output and drop in the cardiac index. Based on this observation, we believe it is possible to have a presumptive diagnosis of partial pericardial tamponade by bidimensional echocardiographic studies just before the surgical reintervention.

Adult↗
PubMedDate not supplied

[The clinical features of myocardial infarct via "normal" coronary angiography. The experience of the Instituto Nacional de Cardiología].

The end-point of our study was to find clinical differences between patients with myocardial infarction and evident obstructions in coronary angiography, and patients without coronary obstructions. In a 10 years follow-up period, 48 patients with diagnosis of myocardial infarction and normal coronary arteries by angiography (group A) where admitted al hospital. We compared this group with 80 patients (group B), randomly selected from all patients with myocardial infarction and evident obstructions in coronarography. Patient age at the ischemic event, familiar history of ischemic heart disease or sudden death, obesity, drug habits, contraception drugs use, and history of migraine and Raynaud's phenomenon were pointed out. Thirty patients from group A were admitted with acute myocardial infarction, and we also analysed in these patients prodromal symptoms, precipitating factors, AMI localisation, serum enzymatic levels, rhythm and/or conduction disturbances, clinical condition, treatment and new ischemic events. Group A patients showed lower age-average, smoking habit, prodromal symptoms and serum CPK levels. They have better ventricular performance parameters and a greater incidence of women. The only different risk factor for ischemic heart disease between both groups was smoking.

Age Factors↗
PubMedDate not supplied

[Transesophageal echocardiography. General principles and applications].

A new echocardiographic technique is described, which allows cardiovascular ultrasonic exploration by means of a transducer mounted on the distal tip of a gastroscope. The transducer is moved along the esophagus and from time to time into the stomach, which permits real-time visualization of the different cardiac segments and the great arteries. This technique is of special utility in the exploration of posterior structures as are the left atrium and its appendage, the pulmonary veins, etc. The most important views in the transverse plane are described, as well as the technical aspects, the limitations and the possible complications.

Echocardiography↗