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Biomedical subjects

G E Alvarez

Publications and source records attributed to G E Alvarez.

7 recordsLinked to original sources
PubMed2001

Gender difference in cardiovagal baroreflex gain in humans.

We tested the hypothesis that women would demonstrate lower cardiovagal baroreflex gain compared with men. If so, we further hypothesized that the lower cardiovagal baroreflex gain in women would be associated with their lower aerobic fitness and higher body fat percentage compared with men. To accomplish this, we measured cardiovagal baroreflex gain (modified Oxford technique) in sedentary, nonobese (body mass index < 25 kg/m2) men (age = 26.0 +/- 2.1 yr, n = 11) and women (age = 26.9 +/- 1.6 yr, n = 14). Resting R-R interval and diastolic blood pressure were similar in the two groups, but systolic blood pressure was lower (P < 0.05) in the women. Cardiovagal baroreflex gain was significantly lower in the women compared with the men (13.3 +/- 1.5 vs. 20.0 +/- 2.8 ms/mmHg, P < 0.05). The lower cardiovagal baroreflex gain in the women was not related (P > 0.05) to their lower aerobic fitness and was only marginally related to their higher body fat percentage (r = -0.34, P < 0.05). There were no gender differences in the threshold and saturation, operating range, or operating point (all P > 0.05), although the operating point fell significantly to left (i.e., at a lower systolic blood pressure) compared with men. Therefore, the findings of this study suggest that the gain of the cardiovagal baroreflex is reduced whereas other parameters were similar in women compared with men. The mechanisms responsible for the reduced cardiovagal baroreflex gain remain unclear.

Adolescent↗
PubMed1993

[Echocardiographic relation criteria. A new selection method for mitral valvotomy with balloon catheter].

PURPOSE: To find out new subjects that could be useful to select patients between 9 and 12 points, according to Block's Criteria, to mitral balloon valvotomy. METHODS: One hundred and forty patients underwent mitral balloon valvotomy. Among them, 29 (21%) had between 9 and 12 points. These patients were divided into two groups: group A-patients with mitral valve area > or = 1.5cm2, immediately after balloon valvotomy and in the follow-up period; group B-patients with mitral valve area < 1.5cm2 immediately after or during the follow-up period, patients with severe mitral regurgitation after the procedure and patients who died in the follow-up period. All patients were analyzed by echocardiographic relation criteria (ERC): calcification + subvalvar disease/thickness + mobility. Each one was quantified from 1 to 4 points according to the degree of valvular disease. RESULTS: Group A was composed of 17 (51%) and group B 12 (41%) patients. The variables age, sex, previous mitral commissurotomy and atrial fibrillation did not show difference between groups. In group A mitral valve area (cm2) increased from 1.15 +/- 0.25 to 1.97 +/- 0.26 (p < 0.00001) keeping stable during the follow-up period. In group B percutaneous mitral balloon valvotomy resulted in an increase from 1.26 +/- 0.19 to 1.77 +/- 0.16 (p < 0.00001), however, there was an important decrease in the follow-up period to 1.34 +/- 0.15 (p < 0.00001). The ERC showed that all group A patients had a relation < 1. However, in group B, 10 patients (83%), the relation was > or = 1, and in only 2 patients (17%) was < 1 (p < 0.00001). CONCLUSION: The group of patients between 9 and 12 points in the Block's criteria is heterogenic, therefore, each case might be evaluated individually and the echocardiographic relation criteria should be used in order to select these patients to the procedure.

Adult↗
PubMed1989

[Mitral valvuloplasty with balloon catheterization in pregnant patients. Report of 3 cases].

The authors report on three pregnant patients with mitral stenosis with heart failure in functional class IV (NYHA) unresponsive to clinical treatment. They were submitted to mitral valvuloplasty, with significant clinical improvement, and were, hence, asymptomatic. Despite the small number of cases, it may be concluded that the procedure is simple and safe, which can be attested by the successful results.

Adult↗
PubMed1983

The split sternocleidomastoid myocutaneous flap.

The transposition of both portions of the sternocleidomastoid muscle for the reconstruction of the face leaves a "flat neck deformity" which has discouraged many surgeons from using it in the treatment of benign cases. By splitting the muscle in its two portions and transposing only one, this deformity can be avoided. We present five cases to illustrate the versatility of the split sternocleidomastoid myocutaneous flap.

Adolescent↗