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Biomedical subjects

F J Baker

Publications and source records attributed to F J Baker.

At least 19 recordsLinked to original sources
PubMed1994

Transcription-coupled repair of psoralen cross-links but not monoadducts in Chinese hamster ovary cells.

We have examined the rate and extent of removal of 4'-(hydroxymethyl)-4,5',8-trimethylpsoralen (HMT) cross-linkable monoadducts and interstrand cross-links from restriction fragments within the amplicon containing the dihydrofolate reductase (DHFR) gene in the Chinese hamster ovary (CHO) cell line B11. The rate and extent of removal of HMT cross-links was significantly greater in an actively transcribed fragment than in a nontranscribed extragenic fragment of similar size. For the 5' half of the DHFR gene, approximately 80% of the HMT cross-links were removed in 8 h, in agreement with results reported by Vos and Wauthier [Vos, J. M., & Wauthier, E. L. (1991) Mol. Cell Biol. 11, 2245-2252, 1991]. However, few cross-links were removed in that period from the nontranscribed fragments, whose 5' end is approximately 7 kb downstream from the DHFR transcription unit and which includes a putative replication initiation site. Even after 24 h, only about 50% of the cross-links had been removed from this fragment. In contrast, both the rate and the extent of removal of cross-linkable HMT monoadducts were similar in the two fragments with 50% of the cross-linkable monoadducts removed in 24 h. Moreover, monoadducts formed in the bulk of the genome were removed in 24 h. Moreover, monoadducts formed in the bulk of the genome were removed at a slightly slower rate and to a lesser extent (30% in 24 hours) than those from either of these specific sequences.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1993

A randomized study of cefepime versus the combination of gentamicin and mezlocillin as an adjunct to surgical treatment in patients with acute cholecystitis.

In patients with acute cholecystitis, antibiotics are used as an adjunct to cholecystectomy to reduce the incidence of postoperative septic complications thought to be related to bactibilia. Combinations of penicillins, or cephalosporins or aminoglycosides, or both, are often used. Cefepime is a fourth-generation cephalosporin with excellent activity against gram-positive and gram-negative bacteria, including Pseudomonas species. It has a prolonged serum half-life, allowing twice-daily dosing, and is not nephrotoxic. This study was undertaken to determine whether or not cefepime was as effective as the combination of gentamicin and mezlocillin in patients with acute cholecystitis. One hundred and forty-nine patients were randomized, two to one, to receive cefepime or gentamicin and mezlocillin. Cefepime was given intravenously at 2 grams every 12 hours; gentamicin, 1.0 to 1.5 milligrams per kilograms every eight hours, and mezlocillin, 3 to 4 grams every four to six hours. All patients underwent cholecystectomy. Bile cultures were obtained, and concentrations of cefepime in blood, bile, peritoneal fluid and gallbladder were determined in a subset of patients. There were 56 evaluable cefepime-treated and 34 evaluable gentamicin and mezlocillin-treated patients. Bactibilia was present in 17 of 56 cefepime-treated patients (30.4 percent) and ten of 34 gentamicin and mezlocillin-treated patients (29.4 percent). Enterococci were recovered in six cefepime-treated patients. Clinical and bacteriologic responses were similar for the cefepime-treated and gentamicin and mezlocillin-treated groups, with one failure in each group, a wound infection in a patient receiving cefepime and a subhepatic abscess in a patients receiving gentamicin and mezlocillin. Other measures of outcome, such as the number of days of fever, days nothing by mouth, days of hospitalization and days of antibiotic therapy were similar in both groups. Cefepime, with every 12 hour dosing, achieved extremely high concentrations in all tissues assayed at the time of the operation, a mean of eight hours after administration. Adverse clinical events were similar in both treatment groups. Cefepime is as effective as gentamicin and mezlocillin in preventing septic complications after cholecystectomy for acute cholecystitis. Cefepime requires fewer doses, does not require drug monitoring, is not associated with nephrotoxicity and may therefore prove to be a cost-effective alternative to combination therapy that uses an aminoglycoside.

Acute Disease↗
PubMed1993

Prospective randomized study of two different doses of clindamycin admixed with gentamicin in the management of perforated appendicitis.

Septic complications after surgery for enterogenous peritonitis are minimized by adjuvant antibiotics effective against aerobes and anaerobes. Historically, "gold standard" therapy included an aminoglycoside plus clindamycin, the latter given at 600 mg intravenous piggyback (IVPB), every 6 hours. Clindamycin pharmacokinetics suggests that it can be given q8h and admixed with gentamicin, thereby markedly reducing the cost of administration. Although this is now common practice, there is no prospective study comparing the efficacy of the two dose schedules in peritonitis. This study was designed to test the hypothesis regarding the clinical efficacy of the two regimens. One hundred twenty-six patients with gangrenous (n = 34) or perforated appendicitis (n = 91) were randomized (2:1) to receive gentamicin admixed with clindamycin 900 mg IVPB every 8 hours (Group I n = 80) or gentamicin IVPB q8h plus clindamycin 600 mg IVPB every 6 hours (Group II n = 46). Appendectomy was performed, and aerobic and anaerobic cultures were obtained. Twenty-one patients had simultaneous determinations of clindamycin levels in plasma, peritoneal fluid, and appendix. Outcome analysis revealed no significant differences in postoperative days of fever, days non per os, antibiotic therapy, or hospitalization. There were 6 failures (4 abscesses and 2 wound infections) in Group I and 4 failures (1 abscess and 3 wound infections) in Group II. Both antibiotic regimens provided clinically equivalent results in mixed infections due to aerobic and anaerobic bacteria. The admixed clindamycin, administered every 8 hours, results in at least 20% reduction in costs. This is an important consideration.

Adult↗
PubMed1988

Cranial burr hole decompression in the emergency department.

Presently virtually all patients with acute head trauma are computed tomography (CT) scanned and transferred to a neurosurgical operating room before any surgical intervention. The time required for this, especially if the patient is transferred to another institution, may lead to a significant delay in treatment. In a patient with an expanding intracranial hematoma and evidence of brainstem compromise this delay may produce a worse outcome. Cranial burr hole placement can rapidly, safely, and accurately find and partially decompress most extracerebral intracranial hematomas. A burr hole placed rapidly before CT and transfer could prevent further damage to the brain by an expanding hematoma. The case of a child with a preterminal epidural hematoma whose outcome was excellent because of a burr hole placed in the emergency department (ED) is presented. In light of this case and a complete literature review, it is suggested that more frequent attempts to decompress intracranial hematomas in the ED may be warranted.

Child, Preschool↗
PubMed1985

Gallium-67 citrate localization in disseminated sporotrichosis.

A 25-year-old woman demonstrated Ga-67 citrate accumulation within a facial cutaneous lesion and two subcutaneous nodules within the right lower extremity. Cultures of the facial lesion and one of the subcutaneous nodules grew Sporothrix schenckii. Ga-67 citrate uptake has not been reported previously with this fungal infection. Ga-67 citrate scintigraphy was helpful in defining the extent of the disease, following its course, and determining the response to therapy.

Adult↗
PubMed1984

Adult gonococcal ophthalmia.

It is important to consider Neisseria gonorrhoeae as a possible pathogen in any case of purulent conjunctivitis. Gram stains and cultures should be obtained and appropriate therapy initiated immediately to reduce the potential for severe and irreversible complications.

Adolescent↗
PubMed1983

Positive gallium-67 scintigraphy associated with pulmonary embolism.

A 54-year-old man presenting with symptoms and signs of pulmonary embolism demonstrated gallium-67 accumulation within the right lower lung field in the region of a pulmonary embolism with effusion. An associated infectious process was ruled out. This is contrary to the usual clinical experience and identifies a potential pitfall in the use of gallium-67 as an aid in the differential diagnosis of pulmonary embolism and pneumonitis.

Diagnosis, Differential↗
PubMed1981

Magnesium: physiology, clinical disorders, and therapy.

Magnesium imbalance is clinically significant. It is common, treatable, and frequently overlooked. We review the literature describing magnesium deficit and excess syndromes and formulate specific treatment protocols.

Acute Kidney Injury↗
PubMed1979

Alcoholic ketoacidosis in a pregnant woman.

A case of alcoholic ketoacidosis in a 23-year-old chronic alcoholic, gravada V, para IV, is reported. Symptoms were constant, severe, nonradiating pain with crampy exacerbations, anorexia, nausea and vomiting. The patient had a tender and irritable full-term uterus. She was treated inhospital with vigorous fluid therapy and 5% dextrose in normal saline, sodium bicarbonate, glucose and insulin and showed improvement overnight. Alcoholic ketoacidosis has not been reported in pregnant women. Metabolic derangements combine to produce ketoacidosis more readily in the pregnant alcoholic. Differentiation of alcoholic ketoacidosis and diabetic ketoacidosis is important since treatment varies. For alcoholic ketoacidosis, treatment is vigorous rehydration with dextrose-saline while diabetic ketoacidosis usually requires multiple therapeutic modalities.

Acidosis↗
PubMed1977

Pulsus paradoxus as a parameter in treatment of the asthmatic.

In 40 patients treated in the Billings Hospital emergency department for acute exacerbations of bronchial asthma, pulsus paradoxus was noted at presentation and at the time of admission to the hospital or discharge. No level of initial pulsus paradoxus predicting eventual admission was found. High initial pulsus paradoxus was more frequent in admitted patients. A correlation between the percent drop of pulsus paradoxus and success or failure of treatment was noted. Treatment failure was the most frequent criterion for admission.

Adolescent↗
PubMed1976

Diabetic emergencies: hypoglycemia and ketoacidosis.

Because hypoglycemia may be rapidly fatal it must be diagnosed and treated early. Ketoacidosis may be difficult to differentiate from hypoglycemia. The diagnosis, treatment and causes of both diabetic emergencies are described. Once rehydration is instituted, further management can be directed using appropriate laboratory and bedside studies that allow stabilization with a high degree of control.

Diabetes Complications↗
PubMed1976

The emergency joint: arthrocentesis and synovial fluid analysis.

Arthrocentesis and the subsequent evaluation of synovial fluid is often the definitive diagnostic procedure for the patient presenting with a joint effusion or intrasynovial hemorrhage. The difficulty of performing arthrocentesis varies with the joint in question, but those joints most frequently involved are easily entered. The indications and contraindications for this procedure are discussed. Effusion-producing pathologic processes often yield fluids of a characteristic nature permitting their classifications into categories of noninflammatory (Group I), inflammatory (Group II), septic (Group III), and hemorrhagic. This categorization of the effusion may permit specific diagnosis or the narrowing of the differential diagnosis. Criteria are established on the basis of joint fluid features to differentiate septic arthritis, which requires inpatient treatment, from those entities for which the patient may reasonably be treated as an outpatient.

Ankle Joint↗