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J Contreras

Publications and source records attributed to J Contreras.

At least 55 records · Page 3Linked to original sources
PubMed1995

[Results of the surgical treatment of colorectal cancer: analysis of recurrence and survival in 400 patients].

We analyzed retrospectively the long term survival and recurrence of 400 patients with colorectal cancer operated in a period of 13 years. Kaplan Meier curves were used for survival analysis and Cox's regression for multivariate analysis. Ninety eight percent of 377 surviving patients were followed for a mean period of 34 +/- 36 months (range 12-156). Global recurrence was 32% and higher for rectal than colon cancer. Sixty five percent of recurrences were distant. The main prognostic parameter for recurrence was peritumoral lymph node involvement. The initial tumoral stage was the main prognostic factor for survival. Five years survival probability was 94.4% in stage A, 81.3% in stage B, 63.8% in stage C1, 41.3% in stage C2 and 3.1% in stage D. Preoperative radiation therapy did not improve survival or recurrence. Postoperative radiation therapy prolonged the lapse between surgery and recurrence, without changing overall survival. The prolonged survival of some patients in stage D justifies palliative surgery in this stage.

Adult↗
PubMed1995

[Renal angiomyolipoma located intrasinusally. An anomalous location which poses diagnostic problems].

Presentation of one case of intrasinusale located renal angiomyolipoma. Given the location, the ECO as well as the IVU, arteriography and CAT presented diagnostic doubts. We believe this unusual presentation should be added to those circumstances where uncertainty of tumor diagnosis due to size, behaviour or clinical signs and symptoms, elicits a more aggressive attitude.

Angiomyolipoma↗
PubMed1994

[The nutcracker phenomenon: an infrequent cause of hematuria].

The nutcracker phenomenon consists in the compression of the left renal vein by the aortomesenteric clamp. This is an infrequent cause of haematuria. The present paper presents one case of nutcracker phenomenon showing haematuria after mild accidental lumbar bruising, with arteriographic diagnosis. CAT assessment showed a mark in the lumbar ureter as well as peripyelic and periureteral varices.

Adolescent↗
PubMed1994

Short-term longitudinal study of maternal ratings of temperament in samples of children with Down syndrome and children who are developing normally.

Ratings of temperament for 32 children with Down syndrome and 44 children who were developing normally over the developmental range from 12 to 36 months were compared. Mothers completed the Toddler Temperament Scales and/or the Bates Infant/Child Characteristics Questionnaire at two time points. Analyses tested for diagnostic group differences in temperament ratings. Multivariate repeated measures analyses of variance, with diagnosis and developmental age as grouping variables, were run for both instruments. For the Toddler Temperament Scales, no between-subjects main effects of diagnosis or interactions were significant; however, a significant multivariate main effect for diagnosis was obtained for the Bates Scales. Ordering consistency for the two samples was considered separately. Cross-time correlations were generally significant; however, relations tended to be of greater magnitude in the normally developing group. Results suggest that the development of temperament, as assessed with maternal ratings, follows a common path in these two groups.

Child, Preschool↗
PubMed1993

[Ambulatory treatment without anesthesia of urinary lithiasis by extracorporeal shock-wave lithotripsy: 7,000 cases].

Exposition of results and complications in 7,162 consecutive sessions with Shockwave Extracorporeal Lithotripsy (SWEL) applied to 3,950 lithiasis located at all levels of the urinary tract. These procedures have been performed without sedation or anaesthesia. Diuresis was not forced during or after treatment with serotherapy, mannitol, or diuretics. Treatment was conducted in an outpatients clinic in all cases. The treatment/lithiasis ratio in this initial series was 1.7. Following therapy, 7.09% of patients treated attended the emergency unit due to colic pain/fever. 3.60% of patients treated required hospitalization due to major complications: subcapsular-retroperitoneal haematoma, 9 cases; ureteral obstruction, 120 cases; septicemia, 22 cases; renal function annulment, 11 cases and death, 2 cases.

Ambulatory Care↗
PubMed1992

Anaphylactic shock by rupture of hydatid hepatic cyst. Follow-up by specific IgE serum antibodies.

Total and specific serum IgE antibodies were estimated in a 68-year-old woman with anaphylactic shock due to spontaneous rupture of hydatid cyst of the liver. After she had recovered, an abdominal ultrasonography showed a cyst, 10 x 15 cm, in the right hepatic lobe. The cyst was surgically removed. Antihydatid IgE in the acute phase and periodically after surgical intervention, determined by Phadezym RAST, Pharmacia, and Pharmacia CAP system (a new solid-phase immunoassay, fully automated, for the titration of specific IgE with greater sensitivity in the detection of low IgE antibody levels), showed decreasing antihydatid IgE antibodies on day 10 after surgical intervention and may thus serve to monitor the evolution of hydatid disease.

Acute Disease↗
PubMed1992

[Eosinophilic gastritis: its spontaneous resolution].

A 34-year-old man presented with acute epigastric pain. Laboratory studies disclosed a total eosinophil count 7.7 x 10(9)/l. The pathological diagnosis was eosinophilic gastritis. There was a spontaneous resolution, and no treatment was required. Investigations for allergic disorders gave negative results.

Acute Disease↗
PubMed1991

[Treatment of uncomplicated urinary tract infections: cefuroxime vs cotrimoxazole].

Forty females (ages 15-74) with community-acquired, uncomplicated urinary tract infections were studied. Clinical and microbiological efficacy of cefuroxime (250 mg td) and trimethoprim sulfamethoxazole (160/800 mg td) used for 7 days were evaluated. The microorganisms found in the pre-treatment urinary cultures were: Escherichia Coli (85%), Klebsiella Pneumoniae (12.5%), and E. Agglomerans (2.5%). They were all susceptible to cefuroxime, and 42.5% were resistant to trimethoprim sulfamethoxazole (Kirby-Bauer). These findings show that trimethoprim sulfamethoxazole should not be used empirically while waiting for the results of urinary cultures, and that cefuroxime is a good alternative in these cases. Clinical cure was observed in all, and bacteriological cure in 75% of the pts treated with both antimicrobial agents. Relapses and reinfections were detected during follow-up emphasizing the importance of intra and post-treatment urinary cultures.

Adolescent↗
PubMed1990

Perioperative monitoring of the electrocardiogram during cerebral aneurysm surgery.

Electrocardiographic (ECG) abnormalities occur frequently following a subarachnoid hemorrhage and may also occur intraoperatively and postoperatively in patients undergoing neurovascular procedures. The aim of this study was to assess the relationship between ECG changes and the neurological status of the patient, the size and the location of the aneurysm, and the influence of these changes on the cardiac and neurological outcome. The preoperative ECG was analyzed in 270 patients. Forty-five patients had intraoperative Holter monitoring. An immediate postoperative ECG was recorded in 120 patients and 60 patients had three consecutive postoperative ECGs. Preoperatively, 52% of the patients had an abnormal ECG and the incidence was highest in patients with a poorer neurological status. Most of the ECG changes involved the T wave or the ST segment. Intraoperative and postoperative changes occurred in 35 and 65% of the patients, respectively, and were independent of the studied factors. There were no documented cardiac events. The presence of an abnormal preoperative ECG did not influence the neurological outcome of the patient, but fluctuating postoperative changes were associated with a worse outcome.

Journal Article↗
PubMed1990

[Medical treatment of uterine leiomyomatosis with an agonist of pituitary gonadotropins (GnRH). Presentation of a case].

The uterine leiomyomatosis represents the largest amount of tumors of the uterus, and the treatment in most of the cases is surgical. This tumor of smooth muscle has been associated with the stimulus given of sexual steroids, mainly estrogens. Several analogues by the hypothalamic hormone liberating gonadotropins (GnRH) show an stimulating-inhibiting action upon hypophyseal gonadotropins secretion (LH-FSH), variable effect on ovarian steroidogenesis, depending on the dose and frequency of use. When the decapeptide is used daily and during more than a month, it may block the production of LH, FSH and estrogens, and produces amenorrhea. As uterine myomatosis is a condition that may depend on estrogens, it was decided to treat with an analogue of GnRH (Intranasal Buserelin Acetate), one patient, 28 years old with clinical, histopathologic and ultrasonographic of uterine myomatosis, who presented manifestations of hypochromic, microcytic anemia by frequent intermenstrual bleedings. The application of GnRH analogue was done daily during eight months. The therapeutical result control of the tumor was done by an ultrasonographic study and with hysterosalpingography, before and after. The treatment was stopped because there was a significant diminution in the tumor size and bleeding disappearance. Two months of follow up have not shown changes.

Adult↗
PubMed1987

Neuroendocrine regulation of anterior pituitary function in patients during and after molar pregnancy.

Only partial studies evaluating the endocrine profile in molar pregnancy have been performed. In order to characterize the neuro-endocrine pattern during and after molar pregnancy, we studied the basal hormonal levels of hCG, human placental lactogen (hPL), FSH, GH, TSH, free thyroxine index (FTI), oestradiol-17 beta (E2), and progesterone (PG), as well as the anterior pituitary response to TRH, GnRH, and hypoglycaemia induced by insulin in 7 patients during molar pregnancy and one week after molar abortion. hCG showed significantly higher serum levels during rather than after molar pregnancy and hPL was detectable in only 4 patients during, but in none after molar pregnancy. FSH values were in the follicular phase range before and after molar abortion (12.7 +/- 0.8 and 12.7 +/- 3.5 IU/l). PRL had elevated basal levels before and after molar abortion; 103.0 +/- 16.5 and 43 +/- 10.6 micrograms/l, respectively (P less than 0.05). GH levels were distinctly elevated in 3 patients during molar pregnancy; after molar abortion, the basal GH values were normal in all patients less than 10 micrograms/l. Basal cortisol and TSH levels were in the normal range before and after molar abortion. The FTI was above the normal range in 3 patients during molar pregnancy, whereas after molar abortion the values were normalized. E2 levels were elevated before and after molar abortion, 1881 +/- 477 and 96.5 +/- 39.2 ng/l, respectively (P less than 0.01). PG levels before and after molar abortion were 30.9 +/- 5.4 and 10 +/- 6.7 micrograms/l, respectively (P less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗