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Biomedical subjects

J Duggan

Publications and source records attributed to J Duggan.

51 records · Page 3Linked to original sources

Fatal peptic ulcer complications and the use of non-steroidal anti-inflammatory drugs, aspirin, and corticosteroids.

Although non-steroidal anti-inflammatory drugs are known to cause peptic ulcer and its complications, controversy exists about the number of deaths from ulcer which are attributable to their use. A case-control study was therefore performed to determine whether prior use of non-steroidal and other anti-inflammatory compounds was associated with an increased case fatality rate from complications of peptic ulcer. Non-steroidal anti-inflammatory drugs were used by 39% of a series of 80 patients who had died from peptic ulcer complications and by 37% of 160 controls who were survivors matched for sex, age, ulcer site, and nature of complication (odds ratio 1.1; 95% confidence interval 0.6 to 2.1). Similarly, the rates of prior use of aspirin by cases and controls were almost identical (odds ratio 1.2; 95% confidence interval 0.5 to 1.9). Thus neither nonsteroidal anti-inflammatory drugs nor aspirin were associated with increased case fatality rates from peptic ulcer complications. In contrast, corticosteroids were associated with an increased mortality (odds ratio 4.2; 95% confidence interval 0.9 to 25.6). Although this increase in the estimated relative risk was not statistically significant, a review of the case records indicated that most deaths in steroid users were due to serious sepsis, indicating that there might be a causal association between use of the drugs and the mode of death.

Adult↗

Enprostil and ranitidine: comparative efficacy and safety in patients with duodenal ulcer.

This randomised, double-blind, double-dummy, multiclinic study of duodenal ulcer healing compared the efficacy and safety of enprostil with ranitidine. The six week trial admitted 164 patients with endoscopically demonstrated duodenal ulcer. Ratings of symptoms and adverse events were collated from patients' daily diaries, and endoscopy was repeated to verify healing after four weeks and, if appropriate, after six weeks. Medication used was enprostil (35 micrograms capsule) or ranitidine hydrochloride (150 mg tablet) with matching placebos twice daily. After six weeks, 81% of patients treated with enprostil and 95% of those treated with ranitidine had healed ulcers, a statistically significant difference (p = 0.007). There were no differences between treatment groups for the number of days until the daytime ulcer pain completely ceased. Night-time ulcer pain ceased significantly earlier in the group receiving ranitidine (p = 0.019) and was less severe during the week before the last visit (p = 0.001); daytime pain for ranitidine users was also less severe (p = 0.020) during this week. Mild to moderate adverse experiences were reported by 44% of enprostil and 35% of ranitidine patients. There were no severe adverse events. In conclusion, both enprostil and ranitidine were found to be safe and effective in the treatment of duodenal ulcer. However, the ranitidine regimen used in this trial produced better results than the enprostil regimen.

Clinical Trials as Topic↗

Activity of lower intercostal and abdominal muscle after upper abdominal surgery.

The decrease in end-expiratory lung volume after upper abdominal surgery has been attributed, in part, to reflex spasm of the abdominal muscles. To examine the influence of abdominal surgery on abdominal muscle tone, electromyographic (EMG) activity of abdominal and lower intercostal muscle was compared before operation with that at 3 hr and at 24 hr after operation in 18 healthy patients undergoing elective gastric or biliary surgery. After operation, EMG activity increased markedly and showed a phasic pattern of activity associated with respiration in most patients. This was characterized by a progressive increase in EMG activity during expiration with an abrupt decrease at the onset of inspiration. We conclude that increased expiratory activity in abdominal and lower intercostal muscle may be responsible for the decrease in lung volumes that occurs after upper abdominal surgery.

Abdomen↗

Confirming a change in refraction with assistance of a programmable calculator.

A computer program has been developed that allows a refractionist to determine the dioptric difference between the powers of two spherocylinder lenses with an inexpensive programmable calculator. The lens system that has been thus calculated may be placed in front of the patient's present spectacles. This allows rapid comparison between the results of the refractive examination and the patient's present spectacles. In difficult cases, this procedure is a useful adjunct in making a decision as to whether the refractive prescription should be changed.

Computers↗

Quantitation of particles in the freeze-fractured nuclear membrane after renal ischemia.

Changes in the number and sizes of membrane-associated particles have been quantitated in the protoplasmic (P) and exoplasmic (E) fracture faces of the outer membrane of nuclei isolated from the inner cortex following renal ischemia and reflow in the rat. No changes were observed in the inner nuclear membrane. After 20-min ischemia, the number of particles in both fracture faces decreased. With reflow, the total number of particles decreased after both 20- and 60-min ischemia. The partition coefficient (Kp = CPF/CEF) increased from 10 to 11 and 17 at 20- and 60-min ischemia then fell below control values to a Kp of 7 after 120 min. After reflow, Kp steadily decreased except after 20-min ischemia followed by 240-min reflow when Kp began to rise. The sizes of particles were predominantly 60 A in the P face of control outer membranes but became larger after ischemia. After 20- and 60-min ischemia with reflow, the size distribution became more normal. The shifts in particle numbers and sizes seem to indicate modifications within the membrane resulting from ischemia.

Animals↗

Plasma membrane changes in freeze-fractured rat kidney cortex following renal ischemia.

Ischemia was produced in the inner cortex of the rat kidney by clamping the pedicle (artery, vein, and ureter) and severing collateral connections. After 30 minutes of ischemia, a slight aggregation of membrane-associated particles was observed in the freeze-fractured plasma membranes. The aggregation was progressive after 60 and 120 minutes of ischemia. These changes were reversible after 15 and 240 minutes of reflow of blood following 30 or 60 minutes of ischemia. The changes were irreversible after 120 minutes of ischemia. The cells were vacuolated after ischemic periods of 30 minutes or longer and after 120 minutes of ischemia the tissue was severely damaged and aggregation of membrane-associated particles was evident in the vacuolar membranes. No changes in the tissue or plasma membrane were observed after 5 or 20 minutes of ischemia.

Animals↗

Induction of porphyrin synthesis in etiolated bean leaves by chelators of iron.

Primary leaves of 7- to 9-day-old etiolated seedlings of Phaseolus vulgaris L. var. Red Kidney infiltrated in darkness with aqueous solutions of alpha, alpha'-dipyridyl, o-phenanthroline, pyridine-2-aldoxime, pyridine-2-aldehyde, 8-hydroxyquinoline, or picolinic acid synthesize large amounts of magnesium protoporphyrin monomethyl ester and lesser amounts of magnesium protoporphyrin, protoporphyrin, and protochlorophyllide. Pigment formation proceeds in a linear manner for up to 21 hours after vacuum infiltration with 10 mm alpha, alpha'-dipyridyl. Etiolated tissues of Zea mays L., Cucumis sativus L., and Pisum sativum L. respond in the same way to dipyridyl treatment. Compounds active in eliciting this response are aromatic heterocyclic nitrogenous bases which also act as bidentate chelators and form extremely stable complexes with iron; other metal ion chelators, such as ethylenediaminetetraacetic acid, salicylaldoxime, and sodium diethyldithiocarbamate, do not elicit any pigment synthesis. The ferrous, ferric, cobaltous, and zinc chelates of alpha, alpha'-dipyridyl are similarly ineffective. If levulinic acid is supplied to etiolated bean leaves together with alpha, alpha'-dipyridyl, porphyrin production is inhibited and delta-aminolevulinic acid accumulates in the tissue. Synthesis of porphyrins proceeds in the presence of 450 micrograms per milliliter chloramphenicol or 50 micrograms per milliliter cycloheximide with only partial diminution. We propose that heme or an iron-protein complex blocks the action of the enzyme(s) governing the synthesis of delta-aminolevulinic acid in etiolated leaves in the dark and that iron chelators antagonize this inhibition, leading to the biosynthesis of delta-aminolevulinic acid and porphyrins.

Journal Article↗

Anticonvulsant use in elderly patients in long-term care units.

BACKGROUND: Elderly patients in long-term care units are frailer than their community-dwelling peers and may be more at risk from toxic side-effects of anticonvulsant medication at standard doses. AIM: To examine the prescribing of anticonvulsants to patients in elderly care units. METHODS: Drug prescription sheets and case notes were reviewed. Serum anticonvulsant concentration, renal and liver profiles and albumin level were measured. RESULTS: Anticonvulsants were prescribed to twice as many male as female patients (32 vs 14%; p<0.03) and to 33% of those younger than 80 years of age versus 10% of those aged 80 years or older (p<0.0002). No patient had significant hypoalbuminaemia and routine measurement of serum anticonvulsant concentration did not indicate an alteration of dosage. CONCLUSIONS: Anticonvulsants appear to be well tolerated in these patients. The younger age of those receiving anticonvulsants is inadequately explained by the characteristics of the patient cohort and may reflect a shift towards a younger age in patients requiring anticonvulsants due to increased mortality in this group.

Aged↗

Reproductive issues in HIV-seropositive women: a survey regarding counseling, contraception, safer sex, and pregnancy choices.

Sixty-nine HIV-seropositive women were surveyed with regard to the reproductive counseling they had received, contraception, safer sex practices, pregnancy histories, and pregnancy plans. Of the women surveyed, 84% and 90%, respectively, felt that they had access to the birth control and safer sex methods of their choice. Less than half felt that their physician had adequately counseled them about birth control. Women primarily cited social workers (46.4%) or nurses (34.8%) as the counseling source for birth control and safer sex. When informed about the reduced risk of vertical transmission with zidovudine (AZT), 33 women indicated that information regarding AZT would affect their future pregnancy decisions. Health care professionals need to be aware of this and counsel patients accordingly.

Adolescent↗