Browsing by Author "González, G."

Now showing 1 - 14 of 14
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    Bone turnover and density in healthy women during breastfeeding and after weaning
    (1996) Lopez, José M; González, G.; Reyes, V.; Campino Johnson, María del Carmen; Díaz, S.
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    Carbon dioxide adsorption studies on delafossite CuFeO2 hydrothermally synthesized
    (2016) Sarabia Vallejos, Mauricio; Rojas, S.; López Cabaña, Z.; Villalba, R.; González, G.; Cabrera Caballero, Alan Raúl
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    Carcinoma familiar del tiroides no medular (CFTNM): características de presentación en 17 casos
    (2007) Mosso, G. L.; Velasco, S.; Cardona, B.; Fardella, C.; González, G.; López, J.M.; Rodríguez, J.A.; Arteaga, E.; Salazar, I.; Solar, A.; González, H.; Cruz, F.; NCD Risk Factor Collaboration (NCD-RisC)
    Background: Papillary thyroid carcinoma can have familial aggregation. Aim: To compare retrospectively familial non medullary thyroid carcinoma (FNMTC) with sporadic papillary thyroid carcinoma (PTC). Material and methods: Retrospective analysis of medical records of patients with thyroid carcinoma. An index case was defined as a subject with the diagnosis of differentiated thyroid carcinoma with one or more first degree relatives with the same type of cancer. Seventeen such patients were identified and were compared with 352 subjects with PTC. Results: The most common affected relatives were sisters. Patients with FNMTC were younger than those with PTC. No differences were observed in gender, single or multiple foci, thyroid capsule involvement, surgical border involvement, number of affected lymph nodes and coexistence of follicular hyperplasia. Patients with FNMTC had smaller tumors and had a nine times more common association with lymphocytic thyroiditis. Five patients with FNMTC had local recurrence during 4.8 years of follow up. Conclusions: Patients with FNMTC commonly have an associated chronic thyroiditis, are younger and have smaller tumors than patients with PTC.
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    Diseño de una escala ecográfica predictora de malignidad en nódulos tiroideos: Comunicación preliminar
    (2009) Domínguez, J.M.; Baudrand, R.; Arteaga, E.; Campusano, C.; González, G.; Mosso, L.; Fardella, C.; Arias, T.; Pizarro, A.; Gómez, M.; Cruz, F.; Torres, J.; Solar, A.; Cavada, G.; NCD Risk Factor Collaboration (NCD-RisC)
    Background: Thyroid nodules are common and associated to a low risk of malignancy. Their clinical assessment usually includes a fine neddle aspiration biopsy (FNAB). Aim: To identify ultrasonographic characteristics associated to papillary thyroid carcinoma (PTC) and generate a score that predicts the risk of PTC. Material and methods: Retrospective review of all fine needle aspiration biopsies of the thyroid performed in a lapse of two years. Biopsies that were conclusive for PTC were selected and compared with an equal amount of randomly selected biopsies that disclosed a benign diagnosis. Results: One hundred twenty two biopsies of a total of 1,498 were conclusive for PTC. Univariate analysis showed associations with PTC for the presence of micro-calcifications (Odds ratio (OR) 49.2: 95% confidence intervals (CI) 18.7-140.9), solid predominance (OR 25.1; 95% CI 6-220), hypoechogenicity (OR 23.5, 95% CI 6.5-122.6), irregular borders (OR 17, 95% CI 7.2-42.9), lymph node involvement (OR 12.3, 95% CI 2.7-112), central vascularization (OR 12.2, 95% CI 4.8-33.3), local invasion and hyperechogenicity (OR 0.2; CI 95% CI 0.03-0.6). Multivariate analysis disclosed microcalcifications (OR 28.1; CI 95% 8.9-89), hypoechogenicity (OR 9.4; 95% CI 1.5-59.5) and irregular borders (OR 4.7; CI 95% 1.5-15) as the variables independently associated with the presence of PTC. The prevalence of PTC in the presence of the three variables was 97.6% (Likelihood ratio (LR) 45) and 5.4% in their absence (LR 0.06). Conclusions: This scale predicts the presence or absence of PTC using simple ultrasound characteristics.
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    Harmonia axyridis in Chile: A new threat
    (2010) Grez, A.; Zaviezo Palacios, Tania; González, G.; Rothmann, S.
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    Hazardous faults of South America; compilation and overview
    (2020) Costa, C.; Alvarado, A.; Audemard, F.; Audin, L.; Benavente, C.; Bezerra, F. H.; Cembrano, José; González, G.; López, M.; Santibáñez Boric, Isabel V.; Minaya, E.; Garcia, J.; Arcila, M.; Pagani, M.; Pérez, I.; Delgado, F.; Paolini, M.; Garro, H.
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    Liver transplantation in children weighing less than 10 kg.: chilean experience
    (2013) Uribe, M.; Alba, A.; Hunter, B.; González, G.; Godoy, J.; Ferrario, M.; Buckel, E.; Cavallieri, S.; Heine, C.; Rebolledo Acevedo, Rolando Arturo; Auad, H.; Acuña, C.
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    Pediatric liver transplantation experience and outcome in Chile
    (2013) Acuña, C.; Zuleta, R.; Dalmazzo, R.; Valverde, C.; Uribe, M.; Alba, A.; Buckel, E.; Hunter, B.; González, G.; Godoy, J.; Ferrario, M.; Cavallieri, S.; Campos, M.; Pizarro, F.; Wash, A.; Ferrón, S.; Díaz, V.; Macho, L.; Herzog, C.; Calabrán, L.; Flores, L.; Soto, P.; Heine, C.; Rebolledo Acevedo, Rolando Arturo; Auad, H.
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    Rathke’s cleft cyst infections and pituitary abscesses: case series and review of the literature
    (Springer, 2021) Aranda, F.; García, R.; Guarda, F.J.; Nilo, F.; Cruz, J.P.; Callejas, C.; Balcells Marty, María Elvira; González, G.; Rojas, R.; Villanueva, P.
    Purpose: Pituitary abscesses (PAs) are a rare clinical entity which may arise from normal pituitary tissue or underlying lesions within the gland. Rathke’s cleft cysts (RCCs) are not commonly associated with the development of PA. Methods: Retrospective chart review of three patients with PAs within RCCs at a single university center and review of the literature. Results: Three cases are reported. The first case presented with fever and headache and a history of prior surgery due to RCC and a recent respiratory tract infection. The second case had a history of recent skin infections and presented with sudden onset headache and hypopituitarism. In the third case, chronic visual field impairment prompted an ophthalmologic evaluation resulting in a diagnosis of an adenoma and an infected RCC. In all three cases, an endoscopic endonasal approach was performed to drain infected tissue and allowed microbiological identification of gram-positive cocci, followed by treatment with antibiotics for at least three weeks. Cases in the literature are scarce and the diagnosis is usually made intraoperatively due to non-specific manifestations and imaging. PAs arising from underlying pituitary lesions are less common than primary PAs. Differential diagnosis should include pituitary apoplexy, hypophysitis and other cystic lesions. Conclusion: PAs occurring in RCCs are infrequent. Clinical manifestations are commonly subacute, without septic symptoms. Imaging is usually non-specific. Preoperative diagnosis is infrequent and a broad differential diagnosis should be considered. Empirical antimicrobial therapy should be initiated and adjusted after obtaining cultures to reduce the rate of recurrence and improve clinical outcomes.
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    Reducción de errores de conciliación en pacientes crónicos pediátricos mediante una estrategia educativa
    (2020) González, C.; González, G.; Plaza Plaza, José Cristián; Godoy, M. I.; Cárcamo, M.; Rojas, C.
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    Situación actual del trasplante hepático pediátrico por hepatopatías crónicas en Chile: Inequidades asociadas a la priorización por sistema MELD/PELD
    (2020) Diaz Piga, Luis Antonio; López, M.; Sin, P.; Wolff, R.; Buckel, Erwin; Pattillo Silva, Juan Carlos; Jarufe Cassis, Nicolás; Martínez Castillo, Jorge; Guerra, Juan Francisco; Gana Ansaldo, Juan Cristóbal; González, G.; Muñoz, M. P.; Uribe, M.; Ananias, Á.; Bezama, I.; Zañartu, N.; Innocenti, F.; Elgueta S.
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    The 16 September 2015 Chile Tsunami from the Post-Tsunami Survey and Numerical Modeling Perspectives
    (2016) Aránguiz, R.; González, G.; González, J.; Catalán, Patricio A.; Cienfuegos Carrasco, Rodrigo Alberto; Okuwaki, Ryo; Urra, Luisa; Contreras, Karla; Del Río, Ian; Rojas, Camilo
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    The influence of temperature and pH on bacterial community composition of microbial mats in hot springs from Costa Rica
    (2019) Uribe Lorio, L.; Brenes Guillén, L.; Hernández Ascencio, W.; Mora Amador, R.; González, G.; Ramírez Umaña, C. J.; Diez Moreno, Beatriz; Pedros Alio, C.
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    Utilidad de la PTH intraoperatoria como predictor de curación quirúrgica en hiperparatiroidismo primario
    (2009) Domínguez, J.M.; Velasco, S.; Arteaga, E.; Campusano, C.; Fardella, C.; López, J.M.; Mosso, L.; Rodríguez, J.A.; González, G.; Goñi, I.; León, A.; González, H.; Claure, R.
    The aim of the surgical treatment of primary hyperparathyroidism (PHPT) is to achieve its complete cure, evidenced by a normal serum calcium in the postoperative period. Measurement of intraoperative serum parathormone (PTH) can be useful to predict complete cure of the disease. Aim: To assess the usefulness of intraoperative PTH measurement to predict complete cure of PHPT. Material and methods: Serum PTH was measured to all patients operated for PHPT between 2003 and 2008, before and five and ten minutes after the excision of the parathyroid gland causing the disease. The criteria for complete cure were a normal serum calcium at 24 hours and 6 months after surgery and the pathological confirmation of parathyroid gland excision. Results: Eighty eight operated patients, aged 58±15 years (72 females) were studied. Sixty four percent were asymptomatic and their preoperative serum calcium was 11.6±1.2 mg/dl. A normal serum calcium was achieved in 86 patients (98%) at 24 hours and 50 of 52 patients followed for six months (96%). The pathological study disclosed an adenoma in 69 (78%), and multiglandular disease in 16 (18%), a parathyroid cancer in one and a normal gland in one patient. Intraoperative PTH predicted early and definitive cure in 97% and 100% of patients with a single adenoma, respectively. Among patients with multiglandular disease, the predictive figures were 94% and 100%, respectively. Conclusions: Intraoperative PTH measurement efficiently predicts early and definitive surgical cure of PHPT.