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Biomedical subjects

B Rydberg

Publications and source records attributed to B Rydberg.

At least 55 records · Page 3Linked to original sources
PubMed1980

Clinical results of 229 patients with duodenal ulcer 1-6 years after highly selective vagotomy.

The aim of this study was to assess the clinical results after highly selective vagotomy (HSV) when used routinely at a district general hospital. A total of 229 patients with chronic duodenal or prepyloric ulcers was included in a 92 per cent complete follow-up 1-6 years after an elective HSV without drainage. There was no postoperative mortality, and the frequency of postoperative complicatons was low. Transient dysphagia and early fullness each occurred in about a quarter of the patients, whereas persistent dumping was found only in 1.3 per cent and diarrhea in 2.2 per cent of the patients. Recurrent ulcer was diagnosed in 12.7 per cent of the patients, but this figure decreased to 9.3 per cent after exclusion of one of the 24 surgeons involved. The overall clinical results according to the modified Visick classification were recorded as excellent or very good in 70 per cent and unsatisfactory in 20 per cent. The failures were almost exclusively due to a proved or suspected recurrence or to gastric retention, and further operations have been performed on 27 of these patients. After reoperation only 8 patients (3.5 per cent) remained failures according to the patient's own judgement at the time of follow-up. The recurrence ratein this study was considered disquietingly high with regard to the short observation time. However, other obvious advantages of the method and the possibility of improved results after adjustment of the surgical technique were considered to justify continued use of HSV as a routine procedure.

Adult↗
PubMed1978

Bromouracil mutagenesis and mismatch repair in mutator strains of Escherichia coli.

A screening procedure based on the formation of papillae on individual bacterial colonies was used to isolate mutants of Escherichia coli with high mutation rates in the presence of bromouracil. Most of the mutants obtained had high spontaneous mutation rates and mapped close to the previously known mutators mutT, mutS, mutR, uvrE and mutL. Except for mutants of mutT type, these mutators also showed high mutability by bromouracil. Transfection experiments were performed with heteroduplex lambda DNA to test for mismatch repair. The results suggest a reduced efficiency of repair of mismatched bases in mutators mutS, mutR, uvrE and mutL, whereas mutants mapping as mutT appear normal. The results support a connection between spontaneous and bromouracil-induced mutability and repair of mismatched bases in DNA.

Bromouracil↗
PubMed1977

The effect of 60Co gamma-radiation and hydroxyurea on the in vivo chain growth of DNA in crypt cells of the small intestine of the mouse.

DNA chain growth has been studied in small intestinal crypt cells of the mouse in vivo using a sensitive method. The method is designed primarily to study radiation-induced DNA-breaks and their repair; but since there are breaks in DNA at the replicating fork, it is also possible to study DNA chain growth after a 3H-thymidine pulse. We found that DNA chain growth is not depressed by 200 rad of 60Co gamma radiation. This finding supports the hypothesis that irradiation interfers mainly with the initiation of new replicons in mammalian cells affecting DNA chain growth only at higher doses. Hydroxyurea at sufficient dosage, however, depresses or even stops DNA chain growth in mouse crypt cells in vivo.

Animals↗
PubMed1977

Clinical results and recurrences 1-4 years after parietal cell vagotomy in duodenal ulcer patients.

168 patients with duodenal or prepyloric ulcer, treated with parietal cell vagotomy (PCV), were followed up one to four years after operation. 67% of the patients had more than 5 years' history of ulcer disease and in 44% preoperative bleeding or perforation could be confirmed. According to the modified Visick classification the clinical results were considered excellent or very good in 71%, with a marked tendency to better results for those surgeons with the greatest experience in performing parietal cell vagotomy. The result was considered unsatisfactory in 25 patients (15%) and this was in all cases due to reoperation and/or recurrent ulcer. There was no postoperative mortality and a low frequency of postoperative complications. Dumping was found in only one patient and mild diarrhoea in two. At follow-up, 16 patients (9.5%) had had a proven and 8 (4.5%) a suspected recurrent ulcer and 3 had gastric retention without recurrence. The recurrence rate was very high for those patients operated during the first year after the introduction of PCV, but then decreased significantly. 18 patients required reoperation. Antrectomy or truncal vagotomy with drainage is considered the method of choice for patients with an incomplete PCV and recurrent ulcer.

Adult↗