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Biomedical subjects

P Vela

Publications and source records attributed to P Vela.

At least 19 recordsLinked to original sources
PubMed1994

[Cholecystectomy in young women from the south-oriental area of Santiago: comparison between 2 periods].

The aim of this study was to know if cholecystectomy rates have decreased in young women, considering that these rates have decreased in the last years in the general chilean population. The frequency of previous cholecystectomy was compared in 1582 women aged 23.9 +/- 5.8 years admitted to a maternity for delivery between 1985 and 1986 and 4943 women aged 24.6 +/- 5.9 years admitted between 1989 and 1990 for the same reason. There was a reduction in cholecystectomy frequency from 4.7 to 2.5% specially among women 21 to 35 years old. Cholecystectomy was performed at a mean age of 23 years in both groups and 42.6% of the procedures were done before the first pregnancy. An unexpected finding was a lower body weight among women studied in the second period (62.5 +/- 9.1 vs 67.7 +/- 8.4 k).

Adolescent↗
PubMed1993

Coronary steal syndrome.

A patient who suffered recurrent myocardial ischaemia and cerebrovascular symptoms 56 months after a quadruple coronary bypass is reported. Three coronary arteries had been bypassed using reversed saphenous vein and the other using the left internal mammary artery (IMA). Coronary angiography demonstrated patency of al bypasses but the presence of an obstruction of the left subclavian artery proximal to the origin of the left IMA, with angiographic criteria of the steal syndrome. The patient's symptoms were relieved by bypass from the left common carotid artery to the distal left subclavian artery. The pathophysiology, diagnosis, prevention and treatment of coronary steal syndrome are discussed.

Aged↗
PubMed1991

Study designs and statistical methods in rheumatological journals: an international comparison.

In order to determine the characteristics of papers published in the rheumatological literature, we have conducted a survey of the seven leading rheumatological journals published in 1987; 1107 original papers have been reviewed and classified according to study design, statistical techniques, and country of origin. Almost half of the published papers were clinical descriptive studies without inferential power; both authors and editors should reflect whether the impact of these studies on the knowledge of readers justifies their frequency. Analytical research was represented mainly by randomized clinical trials (15.6%), and case control studies (14.2%). Cohort studies represented 5.4% and this seems a low figure in a specialty in need of more aetiological research. Almost half of the papers originated from the USA or the UK; journals edited in these countries published papers mainly from the same country. English language journals from other countries published a larger percentage of papers from other countries, including many non-English speaking nations. Bibliometric studies are desirable to evaluate trends in publication.

Epidemiologic Methods↗