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G P Melko

Publications and source records attributed to G P Melko.

3 recordsLinked to original sources

Treatment of radiation-induced proctitis with sucralfate enemas.

OBJECTIVE: To report a case of radiation-induced proctitis treated with sucralfate enemas. CASE SUMMARY: A 77-year-old white woman was transferred from an acute care institution to our inpatient rehabilitation unit with impaired mobility and reduced activities of daily living. Her condition was secondary to myopathy and peripheral neuropathy associated with postradiation chemotherapy and metastatic ovarian carcinoma. During her stay, she developed hematochezia and pain secondary to a diagnosis of radiation-induced proctitis. Her hemoglobin had reached a nadir of 7.3 g/dL. The patient received blood transfusions and was started on 10% w/v sucralfate retention enemas 2 g/20 mL daily for 12 consecutive days. She was symptom-free at discharge, with a stable hemoglobin of approximately 10 g/dL. DISCUSSION: Proctitis is a common adverse effect of radiotherapy to the lower abdomen and pelvic area. Sucralfate is an aluminum complex that acts as a local cytoprotective agent against ulceration of the gastrointestinal mucosal lining. Rectal administration of sucralfate, as described in our patient and reported in published case studies, may provide an alternative therapy for patients with radiation-induced proctitis. CONCLUSIONS: Sucralfate suspension enemas provide a viable treatment option in patients who are intolerant of, refractory to, or not candidates for standard therapy for radiation-induced proctitis.

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Xanthine interference with dipyridamole-thallium-201 myocardial imaging.

Both theophylline and caffeine have been shown to antagonize adenosine and are associated with false-negative test results with dipyridamole-T1-201 imaging. This has led to recommendations for theophylline and caffeine abstinence for at least 24 hours prior to dipyridamole-T1-201 imaging. Because pentoxifylline and its metabolites are structurally similar to theophylline and caffeine, and pentoxifylline has adenosine antagonistic properties, one might presume that pentoxifylline may also attenuate the diagnostic yield of dipyridamole-T1-201 imaging. To the best of our knowledge, the pharmacodynamic interaction between pentoxifylline and dipyridamole and its effects on dipyridamole-T1-201 imaging in patients have never been studied adequately. However, a single study in 7 dogs does suggest that there may be no significant interaction. In addition, we must also consider the nonacute nature of the clinical use of pentoxifylline in peripheral vascular disease and the critical need for accurate dipyridamole-T1-201 imaging results and the cost associated with this procedure. Until such information is available in humans, it would be prudent to discontinue pentoxifylline, in addition to caffeinated foods, caffeine-containing drug products, and theophylline, at least 24 hours prior to dipyridamole-T1-201 imaging.

Adenosine↗

Vancomycin intermediate-resistant Staphylococcus aureus.

OBJECTIVE: To describe further details about the third reported case of vancomycin intermediate-resistant Staphylococcus aureus (VISA). CASE SUMMARY: A patient with a history of recurrent methicillin-resistant S. aureus (MRSA) bacteremia was treated with several courses of vancomycin for 18 of 23 possible weeks on an inpatient/outpatient basis. After 6 months of repeated courses, an isolate of MRSA showed a minimum inhibitory concentration of 8 micrograms/mL, indicating intermediate resistance to vancomycin. The patient continued to receive a vancomycin/aminoglycoside/rifampin regimen and, when he was hospitalized several weeks later, no further MRSA or VISA was detected. DISCUSSION: Prolonged, intermittent vancomycin use (18 of 23 possible weeks) for MRSA bacteremia on an inpatient/outpatient basis most likely contributed to the development of VISA. Infection control measures prevented the spread of VISA among patients and healthcare workers. CONCLUSIONS: Infection control measures and evaluation of antimicrobial prescribing need to be strongly enforced to further prevent the spread and development of resistant organisms.

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