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Yasser Hammad

Publications and source records attributed to Yasser Hammad.

2 recordsLinked to original sources

Living donor hepatectomy (LDH)--comparative study between two different anesthetic techniques.

BACKGROUND: Living donor hepatectomy (LDH) is now widely used to meet the need for liver grafts due to the shortage of cadaveric livers. Donor safety and perioperative anesthetic management are our major concern. The aim of our study was to compare two anesthetic techniques for management of living donor hepatectomy. PATIENTS & METHODS: After ethical committee approval and informed written consent, 20 donors ASA I physical status undergoing hepatectomy for living-relative liver transplant were allocated randomly to one of two groups. Group A where anesthesia was induced with fentanyl 2 microg/kg and propofol 2-3 mg/kg(-1), and maintained with isoflurane 0.8-1.2% and fentanyl infusion 1-2mcg/kg(-1)/h(-1). In group B anesthesia was induced with sufentanyl 0.2mcg/kg(-1), and propofol 2-3mg/kg(-1), and maintained with propofol infusion 6-12 mg/kg(-1)/h(-1), and sufentanyl infusion 0.2-0.4mcg/kg(-1)/h(-1). Atracurium was the muscle relaxant for intubation and maintenance in both groups. RESULTS: There were no perioperative mortality in both groups, no significant statistical differences between both groups as regard demographic data, duration of surgery, duration of anesthesia, hospital stay, intraoperative hemodynamics, blood loss, liver function tests (PT, AST, & ALT) measured in the first, third, and seventh days postoperative. CONCLUSION: In conclusion, our study demonstrated that both anesthetic techniques were well tolerated for living donor hepatectomy, with no blood transfusion required, with short and safe discharge from PACU and short hospital stay, but with significant laboratory changes reflecting transient impairment in metabolic liver function. These procedures have proven useful as an important alternative to the cadaveric liver transplantation. Both techniques can be used as fast tract technique for living donor hepatectomy.

Adolescent↗

Characterization of the sodF gene region of Frankia sp. strain ACN14a and complementation of Escherichia coli sod mutant.

The Frankia sp. strain ACN14a superoxide dismutase SodF was previously shown to be induced in response to Alnus glutinosa root exudates, and its gene was sequenced. We report here the sequence of the 9-kb genomic segment surrounding the sodF gene and further characterize this gene and its product. Nine ORFs coding for various proteins, such as regulators, acetyl-CoA transferases, and a bacterioferritin A next to the sodF gene, were found. Northern blot analysis showed that the sodF gene was expressed as a major 1-kb transcript, which indicates that it has its own promoter. The sodF gene strongly complemented an Escherichia coli triple mutant (sodA sodB recA), restoring aerobic growth when the gene was expressed from the synthetic tac promoter but when expressed from its own promoter showed only slight rescue, suggesting that it was poorly recognized by the E. coli RNA polymerase. It is noteworthy that this is the first time that a Frankia gene has been reported to complement an E. coli mutant. The superoxide dismutase activity of the protein was inactivated by hydrogen peroxide, indicating that the metal ligand is iron, which is supported by analysis of the protein sequence. Thus, the SodF protein induced in Frankia by root exudates is an iron-containing enzyme similar to the one present in the nodules.

Base Composition↗