Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Villarroel F is active.

Publication


Featured researches published by Villarroel F.


Revista Do Instituto De Medicina Tropical De Sao Paulo | 1989

Loxoscelismo en Chile: estudios epidemiológicos, clínicos y experimentales

Schenone H; Tirza Saavedra; Rojas A; Villarroel F

Se presenta un enfoque panoramico de estudios epidemiologicos, clinicos y experimentales referentes a Loxosceles laeta y loxoscelismo efectuados en 1955-1988 en Santiago, Chile. Se estudiaron 216 casos de loxoscelismo. Los hechos mas relevantes fueron: 52,8% correspondio a mujeres; edad entre 7 meses y 78 anos; 84,3% fue loxoscelismo cutaneo (LO y 15,7% loxoscelismo cutaneo-visceral (LCV); 73,6% sucedio en epoca calurosa; en 86,6% el accidente ocurrio en la vivienda, especialmente en dormitorios, mientras la persona dormia o se vestia. La arana fue vista en 60,2% de los casos e identificada en laboratorio como L. laeta en 17,7% (10,6% de los 216 casos). Los sitios mas frecuen temente afectados fueron las extremidades con 67,6%, lancetazo urente fue el sintoma inicial mas frecuente. Dolor, edema y placa livedoide, la cual posteriormente se transformaria en escara necrotica, fueron las manifestaciones locales predominantes. En LCV hematuria y hemoglobinuria fueron constantes, ictericia, fiebre y compromiso de conciencia se presentaron en la mayoria de los casos. Tratamiento: LC con antihistaminicos o corticoides inyectables, LCV con corti-coides inyectables. La condicion de los pacientes en el ultimo control fue: curacion completa en 75,5%, curacion con secuela cicatrizal en 8,3%, muerte en 3,7% (todos con LCV) y abandono en 12,5%. Adicionalmente, se ha efectuado una serie de estudios experimentales, tanto in vivo como in vitro para esclarecer aspectos basicos sobre el veneno de L. laeta y el tratamiento del loxoscelismo.A panoramic sight of epidemiological, clinical and experimental studies, referring to Loxosceles laeta and loxoscelism, carried out in 1955-1988, in Santiago, Chile is presented. Two-hundred and sixteen cases of loxosce lism were studied. The most relevant features were: 84.3% corresponded to cutaneous loxosce lism (CD and 15.7% to viscerocutaneous loxos celism (VCD; 73.6% ocurred in hot season; in 86.6% of cases the accident happened in the hou se, particularly in bedrooms, while the people were sleeping or dressing. The spider was seen in 60.2%r of cases and identified in the laboratory as L. laeta in 10.69c of all cases. The sites more frequently bitten were the limbs with 67.6% ; a burning stinging was the most frequent initial symptom. Pain, edema and livedoid plaque, which developed later into a necrotic eschar, we re the predominant local manifestations. In VCL, hematuria and hemoglobinuria were cons tant, while jaundice, fever and sensorial involve ment were present in most of the cases. CL patients were parenterally treated with antihistamine drugs or corticoids, while VCL ones were treated with corticoids by injection. The condition of patients in the last follow up was: complete cure in 75.5% , cure with a scarfed sequela in 8.3%, death in 3.7% (all VCL) and abandonment in 12.5%. Additionally, a series of experimental studies, both in vivo and in vitro, has been performed in order to clarify basic aspects on L. laeta venom and the treatment of loxoscelism.


Revista Do Instituto De Medicina Tropical De Sao Paulo | 1996

Seroepidemiology of human toxoplasmosis in Chile

Contreras Mc; Schenone H; Patricia Salinas; Lea Sandoval; Rojas A; Villarroel F; Solís F

A series of already published and unpublished seroepidemiological surveys for toxoplasmosis, carried out in Chile in 1982-1994, is reviewed, expanded and analyzed. The surveys included 76,317 apparently healthy individuals of different ages (0.57% of the countrys total population), from 309 urban and rural-periurban localities. Urban groups were integrated by blood donors, delivering mothers and middle grade schoolchildren, while rural-periurban individuals corresponded to unselected family groups. Blood samples were collected in filter paper. The presence of antibodies to Toxoplasma gondii was determined by the indirect hemagglutination test (IHAT), titers > or = 16 were considered positive. The test resulted positive in 28,124 (36.9%) of the surveyed people. Two hundred and six (0.3%) individuals presented IHAT titers > or = 1000, probably corresponding to acute or reactivated infections. A progressive increase of positive IHAT from northern to southern regions of the country was noted, phenomenon probably related to geographical conditions and to a higher production and consumption of different types of meat in the latter regions. It is postulated that ingestion of T gondii cysts by humans is epidemiologically as important as ingestion of oocysts. The result presented stress the epidemiological importance of toxoplasmosis in humans, and warn about eventual implications in immunocompromised patients and in transplacental transmission, organ transplants and transfusions.


Boletín chileno de parasitología | 1985

[Congenital Chagas' disease in Chile. Longitudinal study of the reproductivity of women with or without Chagas' disease and of some parasitological and clinical parameters of them and their corresponding children].

Schenone H; Contreras Mc; J. M. Borgono; Rojas A; Villarroel F


Boletín chileno de parasitología | 1985

[Chagas' disease in Chile. Rural and periurban sectors of the endemo-enzootic area. Relationship between housing conditions, domicilliary triatomid infestation and infection by Trypanosoma cruzi of the vector, humans and domestic mammals. 1982-1985].

Schenone H; Contreras Mc; J. M. Borgono; Rojas A; Villarroel F; Valdés J


Bol. chil. parasitol | 1995

Epidemiología de la enfermedad de Chagas en Chile: frecuencia de infección humana por trypanosoma cruzi por grupos de edad y por regiones

Hugo Schenone Fernández; Contreras Mc; Patricia Salinas; Lea Sandoval; Antonio Rojas Soto; Villarroel F


Boletín chileno de parasitología | 1991

[Overview of the epidemiology of Chagas' disease in Chile].

Schenone H; Contreras Mc; Borgoño Jm; Roberto Maturana; Patricia Salinas; Lea Sandoval; Rojas A; Pablo Tello; Villarroel F


Boletín chileno de parasitología | 1981

[Epidemiological aspects of human infections produced by intestinal protozoa and helminths in Chile (1970-1980)].

Schenone H; Rojas A; Galdames M; Villarroel F


Boletín chileno de parasitología | 1995

Presence of Triatoma spinolai in human dwellings

Schenone H; Villarroel F; Rojas A


Boletín chileno de parasitología | 1986

Epidemiologia de la toxoplasmosis en chile. I. Prevalencia de la infeccion humana, estudiada mediante la reaccion de hemaglutinacion indirecta, en las tres primeras regiones. 1982 - 1985

Schenone H; Contreras Mc; Patricia Salinas; Lea Sandoval; Anamaría Peña; Héctor Rodriguez; Villarroel F; Rojas A


Boletín chileno de parasitología | 1980

[Biological and ecological factors in the epidemiology of Chagas' disease in Chile (author's transl)].

Schenone H; Villarroel F; Rojas A; Alfaro E

Collaboration


Dive into the Villarroel F's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge