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Biomedical subjects

M Sands

Publications and source records attributed to M Sands.

At least 19 recordsLinked to original sources
PubMed2001

The investigation of an equilibrium dependent reaction for the formation of enamines in a microchemical system.

The paper describes the equilibrium dependant reaction for the formation of enamines in a microchemical system utilising electroosmotic flow (EOF) for fluid mobilisation. The authors have shown that the reaction can be carried out without the presence of a Lewis acid catalyst, in addition the enamine intermediate was synthesised at room temperature using mild solvent conditions. A 42% conversion of cyclohexanone into the enamine has been achieved to date.

Journal Article↗
PubMed2000

Transjugular intrahepatic portosystemic shunts (TIPS): a decade later.

Since the introduction of transjugular intrahepatic portosystemic shunt (TIPS) 10 years ago, it has been used increasingly in the management of portal hypertension and its complications. TIPS is now considered the procedure of choice for management of refractory variceal bleeding. Its role in the management of refractory ascites, hepatic hydrothorax, hepatorenal syndrome, and hepatopulmonary syndrome still awaits further prospective studies. The two main complications of TIPS are hepatic encephalopathy and shunt malfunction. Generally, TIPS stenosis or occlusion is a major drawback requiring routine surveillance of TIPS with doppler ultrasound. Venography with balloon dilation of the stent or placement of serial or parallel stents may be required in some cases. Promising modalities of preventing TIPS malfunction (e.g., brachy-therapy, covered stents, or anti-platelet derived growth factor) are currently being investigated.

Acute Disease↗
PubMed1997

Colonic disease associated with a positive assay for Clostridium difficile toxin: a retrospective study.

In this retrospective review of colonic tissue from 21 patients with a positive stool assay for Clostridium difficile toxin, four groups of patients were identified by pathologic examination. Classic pseudomembranous colitis was identified in 38% of patients in colon biopsies, resections, and at postmortem examination. One third of patients had acute colitis without specific features on colon biopsies at the time of a positive toxin assay. Effects of C. difficile toxin in patients with idiopathic inflammatory bowel disease (10%) could not be pathologically separated from activity of the underlying disease. In 19% of patients, no acute or chronic colitis or pseudomembranous colitis was noted. This report reminds gastroenterologists that C. difficile infection is associated with a range of pathologic changes similar to the well known clinical spectrum of disease.

Adult↗
PubMed1996

Successful expression of human factor IX following repeat administration of adenoviral vector in mice.

Adenoviral vectors can direct high-level expression of a transgene, but, due to a host immune response to adenoviral antigens, expression is of limited duration, and repetitive administration has generally been unsuccessful. Exposure to foreign proteins beginning in the neonatal period may alter or ablate the immune response. We injected adult and neonatal (immunocompetent) CD-1 mice intravenously with an adenoviral vector expressing human blood coagulation factor IX. In both groups of mice, expression of human factor IX persisted for 12-16 weeks. However, in mice initially injected as adults, repeat administration of the vector resulted in no detectable expression of the transgene, whereas in mice initially injected in the neonatal period, repeat administration resulted in high-level expression of human factor IX. We show that animals that fail to express the transgene on repeat administration have developed high-titer neutralizing antibodies to adenovirus, whereas those that do express factor IX have not. This experimental model suggests that newborn mice can be tolerized to adenoviral vectors and demonstrates that at least one repeat injection of the adenoviral vector is possible; the model will be useful in elucidating the immunologic mechanisms underlying successful repeat administration of adenoviral vectors.

Adenoviridae↗
PubMed1995

Lues maligna, or ulceronodular syphilis, in a man infected with human immunodeficiency virus: case report and review.

A 30-year-old bisexual man who was infected with human immunodeficiency virus (HIV) and had a history of anaphylaxis to penicillin developed lues maligna, or ulceronodular secondary syphilis. Therapy with parenteral erythromycin failed, and he was subsequently treated with ceftriaxone following penicillin desensitization. A review of the English-language literature identified 14 cases of lues maligna reported between the early 1900s and 1988. From 1989 to 1994, an additional 12 cases (including the current case) were reported. Of those 12 cases, 11 occurred in patients who either were infected with HIV or were at high risk for HIV infection. Patients infected with HIV may be at increased risk of developing this severe form of secondary syphilis. Lues maligna should be considered in the differential diagnosis of HIV-infected patients who present with ulceronodular lesions.

AIDS-Related Opportunistic Infections↗
PubMed1995

Readying occupational therapy assistant students for level II fieldwork: beyond academics to personal behaviors and attitudes.

Being prepared for Level II fieldwork--and ultimately for clinical practice--requires a mastery of scientific, technical, and interpersonal knowledge and skills. Personal preparedness starts at the beginning of the occupational therapy assistant student's educational journey and can be facilitated and monitored by educators who agree that personal insight and the chance to learn and grow in this area are legitimate goals of occupational therapy education.

Allied Health Personnel↗
PubMed1993

Tongue abscess: case report and review.

Tongue abscesses are extremely rare infections despite the relatively frequent exposure of the tongue to bite trauma during mastication and seizures. We describe a case of tongue abscess in a 40-year-old man and discuss the pathophysiology, diagnosis, and treatment of this entity.

Abscess↗
PubMed1993

Use of rifampin in nonstaphylococcal, nonmycobacterial disease.

Rifampin has very broad antimicrobial properties with in vitro activities against many bacteria, mycobacteria, higher bacteria, chlamydia, fungi, parasites, and viruses (Table 1). The clinical use of rifampin is more limited, in part because of the lack of in vivo human clinical studies demonstrating its efficacy. Investigators have valid concerns regarding the emergence of resistance of mycobacteria if widespread use of rifampin becomes common, although this has not been well documented. Because rifampin obtains therapeutic levels intracellularly and is distributed widely throughout the body, the antibiotic potentially could be used on a broader scale, but more studies will be needed to demonstrate its clinical utility.

Animals↗
PubMed1993

Enzyme replacement with recombinant beta-glucuronidase in the newborn mucopolysaccharidosis type VII mouse.

beta-Glucuronidase injected i.v. into newborn mucopolysaccharidosis VII mice was cleared from the circulation in less than 1 h and taken up by tissues in a distribution corresponding to the location of the mannose 6-phosphate receptor. One h after a 3.5-mg/kg beta-glucuronidase injection, beta-glucuronidase levels were equal to or greater than normal in every organ examined with the exception of the brain, where 31% normal activity was present. Enzyme was detectable histochemically in the major sites of pathology for mucopolysaccharidosis VII including bone, brain, heart, and fixed tissue macrophages. The half-life of recombinant beta-glucuronidase activity in various organs of injected mucopolysaccharidosis VII mice was 1.5 to 4.5 d. These studies show that recombinant beta-glucuronidase administered to newborn mice reaches the sites of clinically important storage in murine mucopolysaccharidosis VII.

Animals↗
PubMed1991

Interstitial deletion of the long arm of chromosome 18, del(18)(q12.2q21.1): a report of three cases of an autosomal deletion with a mild phenotype.

We describe three unrelated patients with apparently identical interstitial deletions of the segment (18) (q12.2q21.1). They were a short and markedly mentally retarded 5 year old girl, a macrocephalic and obese 2 1/2 year old boy with moderate mental retardation, and a macrocephalic, severely mentally retarded 5 year old boy. Findings common to all five liveborn patients so far identified as carrying this deletion include a pattern of minor dysmorphic features (prominent forehead, ptosis of the upper eyelids, full periorbital tissue, epicanthic folds, strabismus), muscular hypotonia, seizures, behavioural disorders, and lack of major malformations.

Abnormalities, Multiple↗
PubMed1990

Anti-mosquito antibodies reduce the susceptibility of Aedes aegypti to arbovirus infection.

Aedes aegypti (L.) mosquitoes showed a significant reduction in susceptibility to infection with Ross River virus and Murray Valley encephalitis virus when they were fed on a blood-virus mixture containing rabbit antibodies to mosquito midgut components. Presence of the antibodies did not demonstrably affect virus titres in infected mosquitoes, nor the transmission of virus from infected mosquitoes to vertebrates.

Aedes↗
PubMed1990

Alagille syndrome and deletion of 20p.

We add five cases of 20p deletion to the 10 cases already published. Four had craniofacial, vertebral, ocular, and cardiovascular features of Alagille syndrome, which adds weight to the assignment of this disorder to the short arm of chromosome 20. Included in our series is the first report of familial transmission of a 20p deletion.

Abnormalities, Multiple↗
PubMed1989

Outbreak of nosocomial Flavobacterium meningosepticum respiratory infections associated with use of aerosolized polymyxin B.

Flavobacterium meningosepticum is an uncommon cause of adult nosocomial infection. On a medical/surgical intensive care unit we recently encountered an adult outbreak of respiratory colonization and infection caused by this organism, which was associated with the prophylactic use of aerosolized polymyxin B that had been used in an attempt to abort an outbreak of infection caused by highly resistant strains of Pseudomonas aeruginosa. Twenty isolates (95% from respiratory secretions) of F. meningosepticum from nine persons were identified during a 2 1/2-month period. No environmental source has been identified to date. Pneumonia developed in five patients, and two deaths associated with this organism occurred. All isolates were sensitive to ciprofloxacin; none were sensitive to other antibiotics tested, including third-generation cephalosporins, aminoglycosides, erythromycin, trimethoprim-sulfamethoxazole, antipseudomonal penicillins, aztreonam, and imipenem/cilastatin. Two patients with nosocomial pneumonia were successfully treated with oral ciprofloxacin. F. meningosepticum may emerge as an important pathogen if prophylactic use of polymyxin B becomes more widespread. Ciprofloxacin may become the agent of choice for treatment of this organism.

Administration, Inhalation↗
PubMed1989

Outpatient intravenous antibiotic therapy.

Outpatient intravenous antibiotic therapy is a cost-effective modality to shorten hospital stays and provide continued care to patients with infections. The recent availability of tamper-proof pumps that can deliver multiple antibiotics on independently timed regimens will further expand the use of home intravenous antibiotics. Problems with reimbursement remain, and new classes of oral antibiotics may provide alternatives to parenteral medications.

Ambulatory Care↗