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Biomedical subjects

Y Niv

Publications and source records attributed to Y Niv.

At least 145 records · Page 8Linked to original sources
PubMed1987

Assessment of prolonged venom immunotherapy in children.

Venom immunotherapy was initiated in 94 children from April 1977 to October 1979. As of February 1983, 66 children had continued receiving treatment and had recent immunologic evaluation. Assessment of prolonged venom treatment included analysis of immunologic parameters, efficacy of treatment, and long-term safety. Venom skin tests, venom-specific IgE antibody levels, and venom-specific IgG antibody levels comprised the immunologic parameters evaluated. A decrease in allergic sensitivity was demonstrated over time in the skin and serum. Forty-three of 57 (75%) children had less positive vespid venom skin tests, and the mean venom-specific IgE antibody level declined to less than the pretreatment value with 3 or more years of yellow jacket venom therapy. Venom-specific IgG antibody measurements rose rapidly after the initiation of venom injections and were maintained for the duration of this evaluation. During a 3- to 6-year period, 200 stings in 49 treated children resulted in only four mild systemic reactions (98% efficacy). The benign nature of interval histories, physical examinations, and laboratory analyses in these children argues optimistically for the safety of prolonged venom immunotherapy.

Adolescent↗
PubMed1987

Change in the extent of colonic involvement in ulcerative colitis: a colonoscopic study.

The change over time in the extent of colonic involvement in ulcerative colitis has, to date, been assessed only by radiological means. To study this issue further, we examined, with repeated colonoscopies, 31 patients with ulcerative colitis. Serial biopsies were taken every 5 cm from the most proximal area reached by the colonoscope down to rectum. The endoscopic and histological extents were evaluated, and the severity of the inflammatory process was graded. Clinical scoring also was performed at the time of both colonoscopies. A change of extent was found in 77% of the patients endoscopically, and in 58% histologically, during a mean follow-up period of 17 months. Extension and regression were demonstrated in the same number of patients. In 61% of 62 procedures, there was complete agreement between colonoscopic and histological extents. The histological extent exceeded the colonoscopic extent in 28% of the procedures. We have the impression that change in the disease extent is a frequent event, and may be a part of the natural history of ulcerative colitis, rather than the exception.

Adult↗
PubMed1986

Colorectal adenomatous polyps and carcinoma in Ashkenazi and non-Ashkenazi Jews in Israel.

In Israel, the incidence of colorectal cancer among European-American-born Jews is approximately 2.5 times that of African-Asian-born Jews. To determine the risk of all colorectal tumors for the two ethnic groups, 335 patients with colorectal adenomatous polyps and 295 with colorectal cancer, diagnosed between 1980-1984 at the Sheba Medical Center, were compared to the 35,094 persons attending the outpatient clinics at the same hospital, during September and October 1984. Ashkenazi patients (European-American-born) had a 2.5-fold risk (95% confidence interval 1.9-3.3) of colorectal polyps compared to non-Ashkenazi patients (African-Asian-born). The risk was similar for males (odds ratios [OR] = 2.3) and females (OR = 2.8). Ashkenazis also had a significantly enhanced risk of carcinoma: OR = 3.1; 95% confidence interval 2.2-4.3. The risk ratio was slightly higher for males (OR = 3.5) than females (OR = 2.7). Age-specific analyses demonstrated an elevated risk of both malignant and benign neoplasms among Ashkenazi patients at all ages at diagnosis. Among the polyp patients, the highest risk ratio was for patients between 30 and 49 years old, while among the cancer patients the risk was highest in the group of 60-69-year-olds. The distribution by size of polyps, number of polyps, as well as polyp subsite, was similar for Ashkenazi and non-Ashkenazi patients; however non-Ashkenazis tended to have slightly more right-sided colon cancer.

Adult↗
PubMed1986

Solitary rectal ulcer syndrome--clinical, endoscopic, and histological spectrum.

Nineteen patients with solitary rectal ulcer syndrome are presented. The diagnosis was established on sigmoidoscopic and histopathological grounds; the clinical, endoscopic, and histological states were assessed at presentation and on last follow-up. Most of the patients suffered from rectal bleeding, abdominal and anorectal pains, constipation, and straining at defecation. Thirteen patients had macroscopic ulcerations on presentation and six patients did not. These six patients did not develop ulcer during the follow-up period. Four patients entered clinical and endoscopic remission with no histological improvement. Three of them managed conservatively and one underwent suturing of the ulcer and internal anal sphincter dilatation. They remained in remission for a mean follow-up of 1 yr.

Adult↗
PubMed1986

A community-based program of colorectal screening in an asymptomatic population: evaluation of screening tests and compliance.

The incidence of colorectal cancer in Ashkenazi Jews is two to three times higher than in non-Ashkenazis. For a community colorectal screening program 1339 asymptomatic Ashkenazis over 40 yr old were asked to participate. Of these 1012 (75%) took Hemoccult II kits [fecal occult blood tests (FOBT)], and 614 (46%) personally returned them. Screenees were interviewed regarding family and personal medical history. Fourteen persons (2.3%) had positive tests, in whom colonoscopy revealed two with cancer (Dukes' B,C) and two with a greater than 2 cm polyp. The remaining 600 persons were invited for flexible sigmoidoscopy (FS) but only 287 (48%) appeared. The mean depth of insertion of the instrument was 50.3 cm (range 30-120), but was poorer for women. FS identified lesions in 28 (9.7%) persons: three had Dukes' A carcinomas and 25 had less than 2 cm adenomatous polyps. Significantly more women than men accepted FOBT, but among those completing FOBT, there was no difference by sex for use of FS. Middle-aged persons (50-69 yr) found screening more acceptable than young or older persons. Among screenees who agreed to undergo FS, a significantly larger fraction had a first relative with colon cancer, or a personal history of colon or female genital neoplasia, compared to those not agreeing to FS. There were no differences in screenees with relatives with noncolon cancer. Eighty-eight couples completed FOBT and were invited for FS. The decision whether or not to participate was made for both members in 81 (92%) couples. In conclusion, effective screening programs have to take into consideration compliance patterns of the target population.

Adult↗
PubMed1986

Torsion of leiomyosarcoma of Meckel's diverticulum.

A rare case report of leiomyosarcoma of Meckel's diverticulum, which caused torsion and strangulation of the diverticulum, is presented. The clinical picture was similar to acute appendicitis, which was the working diagnosis when the 42-yr-old Arab woman was sent to surgery. Although rare, leiomyosarcoma is the most common tumor of Meckel's diverticulum, and has to be considered in the differential diagnosis of right lower abdominal pain.

Abdomen, Acute↗