New intervention strategies for reducing antibiotic resistance.

Rising antibiotic resistance rates among bacterial pathogens have resulted in increased morbidity and mortality from nosocomial infections. Widespread use of certain antibiotics, particularly third-generation cephalosporins, has been shown to foster development of generalized beta-lactam resistance in previously susceptible bacterial populations. Reduction in the use of these agents (as well as imipenem and vancomycin) and concomitant increases in the use of extended-spectrum penicillins and combination therapy with aminoglycosides have been shown to restore bacterial susceptibility. Studies have shown that education-based methods, as opposed to coercive measures, are effective in changing the prescribing habits of physicians. Cooperative interaction among infectious-disease physicians, clinical pharmacists, microbiology-laboratory personnel, and infection-control specialists is essential to provide useful suggestions regarding antibiotic choice and dosing to the prescribing physician in real time. Several hospitals have implemented antimicrobial resistance management programs based on these findings. The results of these programs validate the use of a multidisciplinary, education-based, antibiotic-resistance management approach.

Comparison of amphotericin B lipid complex with amphotericin B and SCH 39304 in the treatment of murine coccidioidal meningitis.

To assess the efficacy of amphotericin B lipid complex (ABLC) in the treatment of coccidioidal meningitis, we compared a wide range of doses (0.35-15 mg kg-1, intravenously (IV)) of ABLC with amphotericin B deoxycholate (AmB) (0.3-7 mg kg-1, intraperitoneally (IP)) and (IV) and a new triazole, SCH 39304 (SCH), in an experimental murine model. Survival data showed high dose ABLC to be of equal efficacy to IV and high dose IP AmB and SCH. Quantitative studies confirmed this outcome. No acute toxicity with ABLC, at the doses employed, was found. We conclude that ABLC is effective in the treatment of murine coccidioidal meningitis.

Comparison of SCH 39304 and its isomers, RR 42427 and SS 42426, for treatment of murine cryptococcal and coccidioidal meningitis.

SCH 39304 (304) and its isomers, SCH 42426 (426) and SCH 42427 (427), are new orally administered antifungal azole derivatives. In this study, we compared the efficacy of 304 with that of 426 and 427 in murine models of cryptococcal and coccidioidal meningitis. On day 18 postinfection with Cryptococcus neoformans, controls showed 80% mortality. The 50% protective doses calculated at this day were 0.56 mg of 304 per kg of body weight, 23.5 mg of 426 per kg, and 0.11 mg of 427 per kg. Controls with coccidioidal meningitis all succumbed, and treated mice at the same time point showed 50% protective doses of 10.8 mg/kg for 304, 200 mg/kg for 426, and 2.1 mg/kg for 427. We conclude that isomer 427 is five times as potent, whereas 426 is 1/50th as potent as 304 in these experimental mycoses.

Cerebral vasospasm: theoretical causes, medical management, and nursing implications.

Cerebral vasospasm is a potentially life-threatening complication following subarachnoid hemorrhage (SAH) from a ruptured cerebral artery aneurysm. Traditionally, vasospasm has been treated with a variety of medical interventions. However, surgical intervention with an extracranial to intracranial (EC/IC) bypass graft has yielded promising results in a limited group of patients. This article discusses the theoretical causes of cerebral vasospasm, its clinical presentation, diagnosis, and treatment modalities. Nursing interventions for the patient experiencing cerebral vasospasm are also presented.

Extracranial-intracranial bypass surgery.

Although the indications and effectiveness of the operation remain controversial, extracranial-intracranial (EC-IC) bypass surgery has become a common method in the treatment of patients with cerebral vascular disease. The technical feasibility of the procedure and its low mortality and morbidity rates are well established. However, its usefulness remains unproven in a variety of clinical, angiographic and regional cerebral blood flow patterns. This discussion focuses on the purpose of EC-IC bypass surgery as well as the procedure itself and postoperative nursing care.