Spectrophotometric complexation of cephalosporins with palladium (II) chloride in aqueous and non-aqueous solvents.

The complexation reaction of cephalosporins namely cefotaxime (CTX), cefuroxime (CRX), and cefazolin (CEFAZ) with palladium (II) ions have been studied in water and DMF in 25 °C by the spectrophotometric methods. The method is based on the formation of yellow to yellowish brown complex between palladium (II) chloride and the investigated cephalosporins in the presence of sodium lauryl sulfate (SLS) as surfactant. The complexation process was optimized in terms of pH, temperature and contact time. The stoichiometry of all the complexes was found to be 2:1 (metal ion/ligand) for CTX, CRX, and 1:2 for CEFAZ. The stoichiometry of palladium (II)-cephalosporins was estimated by mole ratio and continuous variation methods and emphasized by the KINFIT program. These drugs could be determined by measuring the absorbance of each complex at its specific λmax. The results obtained are in good agreement with those obtained using the official methods. The proposed method was successfully applied for the determination of these compounds in their dosage forms.

General surgical adverse events in a UK district general hospital-lessons to learn.

BACKGROUND: An adverse event (AE) is defined as an unintended injury or complication caused by healthcare management rather than the disease process that may prolong admission and lead to disability or death. This study retrospectively assessed all reported general surgery-related AEs in a district general hospital in the south-east of England. METHODS: All general surgical AEs arising from adult inpatient admissions between 2002 and 2007, that had been reported to the risk management team, following completion of the standard 'Adverse Incident Report Form', were retrospectively reviewed. RESULTS: There were 24,185 general surgical admissions over the period of the study; 461 AEs were reported (1.9% mean annual incident rate; 95% CI, 1.3%-2.5%). The majority (85%) were near miss or no injury events (category I and II) while serious/serious near-miss incidents accounted for just 2% of events. Communicative or administrative problems were implicated in 54% of cases while 12% arose from theatre/surgery-related failure. Of 58 medico-legal claims (0.24% of admissions) that were made, 16 (27.5%) progressed to the law courts for formal settlement. CONCLUSION: The reported annual AE incident rate of approximately 2% is well below the national average: this may be due to pre-selection of general surgery-related AEs or represent under-reporting of incidents. The vast majority of AEs were related to administrative and communicative error. These areas must be addressed if patient safety and outcome is to be significantly improved.