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Biomedical subjects

R L Anderson

Publications and source records attributed to R L Anderson.

At least 289 records · Page 16Linked to original sources
PubMed1987

Paranasal sinusitis, orbital abscess, and inflammatory tumors of the orbit.

We present the clinical, radiological, and histopathological findings from a case of unilateral inflammatory mass of the right orbit, originating in the ipsilateral paranasal sinuses. A connection between inflammatory tumors of the orbit and paranasal sinusitis has been suspected for many years. This case shows a definite association between chronic paranasal sinusitis, orbital cellulitis, subperiosteal abscess, and formation of an inflammatory orbital tumor. Early diagnosis combined with appropriate therapeutic measures is essential in order to prevent adverse consequences, which can include severe visual loss.

Abscess↗
PubMed1987

Unilateral blepharochalasis.

We present two unique cases of unilateral blepharochalasis. Blepharochalasis is an idiopathic disorder of young adults manifested by intermittent, recurrent episodes of eyelid edema. After repeated episodes of swelling, the periorbital tissue develops premature aging with thinned, redundant skin and stretching of the eyelid tendons. Blepharochalasis is considered bilateral; unilateral cases are extremely rare. Ptosis surgery in these cases may be unpredictable due to alterations in the levator aponeurosis. Simple reattachment of the apparent edge of the disinserted levator aponeurosis may cause significant overcorrection and variations in postoperative eyelid heights. Our two unilateral cases demonstrated proptosis on the affected side, and prominent vessels in the levator aponeurosis and suborbicularis muscle planes, plus vascular changes in orbital fat in one case. Blepharochalasis therefore may be an orbital rather than a periorbital disease, as suggested previously. Proptosis is probably overlooked in the usual bilateral cases. When all other causes of unilateral swelling have been ruled out and the findings are consistent with blepharochalasis, this diagnosis should be considered.

Adolescent↗
PubMed1987

Wound necrosis following dacryocystorhinostomy in patients with Wegener's granulomatosis.

Two patients with Wegener's granulomatosis underwent dacryocystorhinostomy (DCR) for nasolacrimal duct obstruction and epiphora. Wound necrosis occurred in each individual with the formation of a nasal-cutaneous fistula. A pedicle flap was the treatment of choice in one case, while direct closure of the necrotic incision site and high-dose steroid therapy was used in the other. Both did well with complete wound healing. The tearing persisted in one and resolved in the other. Dacryocystorhinostomy should be avoided whenever possible in patients with Wegener's granulomatosis, and steroid dosage should be increased if surgery is necessary in the presence of active inflammation.

Adult↗
PubMed1987

Metastatic disease first presenting as eyelid tumors: a report of two cases and review of the literature.

We present two unusual cases in which an eyelid tumor was the first sign of metastatic disease. The first involved a 53-year-old man with pulmonary carcinoma and the second a 71-year-old man with malignant lymphoma. Fifteen similar cases from the literature are reviewed. The most frequent primary lesion is breast carcinoma in women, which appears as a diffuse lesion of one or two eyelids. Metastatic lung carcinoma in men appears as solitary nodules, representing the second-most common type of lesion. The questions of left- or right-side predominance, age and sex of patients, types of tumors, and prognosis are discussed.

Aged↗
PubMed1986

Tarsal rotational flap for upper eyelid reconstruction.

Reconstruction of full-thickness defects in the upper eyelid presents a special challenge to the oculoplastic surgeon. We present and discuss a new, surgically simple technique for posterior lamella reconstruction of the upper eyelid, which can also be used with other procedures. The surgical technique calls for a vertical strip of tarsus (tarsal flap) to be rotated horizontally and sutured to canthal tendon remnants or periosteum at the orbital rim. This procedure has produced satisfactory to excellent results in our test group, and presents the reconstructive surgeon with several advantages over other techniques.

Adenocarcinoma↗
PubMed1986

The septal pulley in frontalis suspension.

We present a modification of the frontalis suspension for blepharoptosis, first described in 1937, that eliminates many of the drawbacks of traditional brow suspension techniques. Functional and cosmetic problems with standard suspension procedures are related to the superficial location of the sling in the eyelid, which leads to unsatisfactory geometric tenting of the pretarsal and preseptal skin, obliteration of the lid crease, and a pulling away of the upper lid from the globe with brow elevation. Eyelid height is also limited by the upper lid being pulled away from the globe. By anchoring the suspensory material behind the superior orbital septum near the arcus marginalis, more physiologic vectors of elevation are transmitted to the upper eyelid. This modification has yielded good cosmetic and functional results in 96 cases of frontalis suspension using both autogenous and allosplastic materials, and it deserves to be more widely used.

Blepharoptosis↗
PubMed1986

Glucocorticoid-induced heat resistance in mammalian cells.

Chinese hamster ovary cells were incubated for 24 h in a variety of steroid hormones (testosterone, progesterone, hydrocortisone, dexamethasone, and ecdysterone) to test their effect on the subsequent heat resistance of the cells. Only the glucocorticoids, hydrocortisone and dexamethasone, consistently induced heat resistance. Heat resistance induced by hydrocortisone at 10(-6)M developed after a lag of 2-3 h and was maximal by 20 h. Resistance was expressed in both asynchronous and plateau phase cells and was maintained for several days in medium without added hormone. Incubation of cells with hydrocortisone and a 100-fold excess of progesterone (a glucocorticoid antagonist) partially inhibited the development of resistance. Prior exposure to hydrocortisone did not inhibit the subsequent development of heat induced thermotolerance. However, cells made thermotolerant by prior heat shock did not display further heat resistance with hydrocortisone treatment. There was no evidence for the induction of heat shock proteins (HSP) by these steroid hormones although the 28 kDHSP was further enhanced by combined heat and hydrocortisone. Our results indicate that heat resistance in mammalian cells may be induced by physiological concentrations of glucocorticoids and that the characteristics of this resistance are consistent with a receptor mediated event.

Animals↗
PubMed1986

Effect of N-nitroso-n-butyl-(4-hydroxybutyl)amine exposure on the changes in mineral disposition caused by trisodium nitrilotriacetate.

Male Fischer 344 rats were used to determine effect of consumption of 0.5% N-nitroso-n-butyl-(4-hydroxybutyl)amine (BNN) in the drinking-water for 2 wk on the response to 0.02, 0.2 and 2.0% trisodium nitrilotriacetate (Na3 NTA . H2O) in the diet in terms of urinary mineral excretion, bladder mass and bladder mineral concentrations. The primary objective of the study was to determine whether exposure of rats to an initiating dose of a bladder carcinogen (BBN) alters the threshold dose of Na3NTA . H2O required to alter urinary or bladder mineral concentrations or the dose-response to NTA. Such alterations are considered to be necessary precursors for changes in bladder morphology in rats fed NTA in chronic toxicity studies (Anderson, Bishop & Campbell, CRC Crit. Rev. Toxicol. 1985, 15, 1). The results demonstrated that BBN exposure caused an increase in bladder mass and bladder-tissue Zn concentration. However, BBN pretreatment did not have any effect on Na3NTA . H2O metabolism, the threshold dose of Na3NTA . H2O required to attain the necessary conditions for induction of bladder toxicity by NTA, or the dose-response relationships for NTA's effects on any parameter examined. From these data, it is concluded that it is unlikely that NTA would show a different threshold or dose-response for bladder tumour promotion than for its tumorigenicity at this site, which has been demonstrated previously (National Cancer Institute, DHEW Publication No. (NIH) 77-806, 1977).

Acetates↗
PubMed1986

Trypsin inhibitor ingestion-induced urinary indican excretion and pancreatic acinar cell hypertrophy.

Sodium saccharin (NaSacc) has been shown to be a protease inhibitor and to induce an increase in urinary indican, which is a product that is dependent on microbial metabolism of tryptophan. These findings suggest that urinary indican might provide a noninvasive marker of increased pancreatic acinar cell size associated with plant trypsin inhibitor ingestion. The results demonstrate the 7.5% of dietary NaSacc, which increases urinary indican, also increases relative pancreas mass (g/kg body weight), and that these effects are not induced by intravenous infusion of NaSacc. Dietary soybean trypsin inhibitor in the dose range of 17-713 mg/100 g diet was associated with parallel dose-dependent increases in urinary indican and pancreatic acinar cell size (assessed histologically). These findings suggest that measurement of relative urinary indican excretion (microgram/g diet ingested) can provide a noninvasive marker of increased pancreatic acinar cell size in rats that ingest compounds which inhibit digestive proteases.

Animals↗
PubMed1986

A review of lacrimal drainage surgery.

The advent of improved silicone intubation sets, increased understanding of lacrimal and nasal anatomy and physiology, and refinements in surgical instrumentation and technique have led to higher success rates in lacrimal surgery. Recent clinical studies, combined with new techniques in canalicular reconstruction, have helped identify which patients will benefit from surgical intervention and which techniques are indicated. Fortunately, this has greatly reduced the number of CDCRs necessary.

Dacryocystorhinostomy↗
PubMed1986

Acquired blepharophimosis in a patient with juvenile blepharospasm.

At 4 years of age, a young girl with Schwartz-Jampel syndrome developed blepharospasm with resultant blepharophimosis. Her eyelids and facial features had been normal until that time. While these rare ocular abnormalities may be present together in patients with this syndrome, the relationship between them has not been explained. We theorize that constant orbicularis squeezing in the pediatric age group retards full eyelid development and leads to acquired blepharophimosis.

Blepharospasm↗
PubMed1986

Ingestion and Adsorption of Bacillus thuringiensis subsp. israelensis by Gammarus lacustris in the Laboratory.

Several groups of Gammarus lacustris adults were exposed to solutions containing 0.5 and 5.0 mg of Bacillus thuringiensis subsp. israelensis per liter for 1- or 24-h periods by using traditional static bioassay exposure procedures. During a postexposure holding period, fecal pellets were removed and plated on tryptic soy agar to determine B. thuringiensis subsp. israelensis spore content. The experiments verified that traditional exposure procedures assure ingestion of B. thuringiensis subsp. israelensis spores and provided a mean dose estimate of 1,948 spores ingested per test animal with a 95% confidence interval ranging from 891 to 4,296 (1-h exposure, 5.0 mg/liter). It was also found that dose level is highly dependent upon both exposure duration and concentration and that relatively short exposures can result in a relatively long-term retention of spores postexposure (>/=30 days). Body burden experiments established that large numbers of spores adsorb to the bodies of test animals during exposure and may in part explain the long-term retention of spores in the test system postexposure. These results imply that in field applications of microbial control agents, toxicologically unaffected but exposed organisms might transport the agent to untreated sites, expanding the effective treatment area and the number of organisms exposed.

Journal Article↗
PubMed1986

Comparison of the standard pour plate procedure and the ATP and Limulus amebocyte lysate procedures for the detection of microbial contamination in intravenous fluids.

The intrinsic and extrinsic microbial contamination of large-volume parenterals has been associated with bacteremias in hospitalized patients. When epidemiologic data suggest the association of contaminated intravenous (i.v.) fluids with disease, appropriate laboratory methods must be devised to analyze quickly the suspect fluid. A study was undertaken to compare three laboratory test methods (standard pour plate [SPP] technique, ATP procedure, and Limulus amebocyte lysate [LAL] assay) for detecting the presence of microorganisms in artificially contaminated i.v. fluid. SPP proved the most sensitive of the assay techniques used, but a 24-h period was required for microbial growth. The LAL assay appeared more sensitive in detecting i.v. contamination than the ATP method. These studies suggest that the LAL and ATP methods can be used for the rapid detection of microbial contamination in i.v. fluid. SPP and LAL procedures would have practical laboratory application when the contamination of i.v. fluids is suspected, and they are more sensitive in detecting microbial contamination in these solutions than the ATP method.

Adenosine Triphosphate↗