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Biomedical subjects

T W Williams

Publications and source records attributed to T W Williams.

At least 73 records · Page 4Linked to original sources
PubMed1975

Antimicrobial susceptibility of clinical isolates of gram-negative bacilli.

No one can doubt the increased incidence of gram-negative bacillary infections and the importance of an awareness of this increase. Today's hospital, where one finds aggressive surgery, patients with multiple indwelling polyethylene lines and Foley catheters, and widespread use of prophylactic antibiotics, serves as a haven for resistant gram-negative bacilli. Twenty-five strains of Escherichia coli, Klebsiella sp, Enterobacter sp, Pseudomonas sp, indole-negative Proteus sp, indole-positive Proteus sp, and Serratia sp from hospitalized patients were tested for susceptibility to eight commonly used antibiotics using an inocula replicating method. Gentamicin proved to be the most effective antibiotic against the majority; most strains were inhibited by 3.12mug/ml or less. Other antibiotics, although not so active against all species, were effective against selected species.

Administration, Oral↗
PubMed1975

Study of the effects of ticarcillin on blood coagulation and platelet function.

Ticarcillin is a new semisynthetic penicillin similar to carbenicillin. Since carbenicillin has been shown to inhibit platelet function to such an extent that bleeding may accompany its use, an investigation of the effects of ticarcillin on hemostasis was made. The drug was administered to 17 human volunteers for periods of 3 to 10 days in intravenous doses of 100, 200, or 300 mg/kg per day (7 to 21 g/day). Serial studies of blood coagulation and platelet function indicated that coagulation was unaffected by ticarcillin but that platelet function became defective in all subjects. Abnormal platelet function was evidenced by lengthening of bleeding time (17 of 17 volunteers), depressed adenosine diphosphate-induced platelet aggregation (17 of 17), defective collagen-induced aggregation (15 of 17), and abnormal epinephrine-induced aggregation (10 of 17). Prothrombin consumption, due to reduced platelet procoagulant activity, was significantly decreased with a dose of 300 mg/kg per day. Comparison of results from this study with those from an earlier carbenicillin study revealed that ticarcillin at 300 mg/kg per day produces the same defects in hemostasis as does carbenicillin at 300 mg/kg per day, but that lower doses (100 or 200 mg/kg per day) of ticarcillin result in only a mild defect in platelet function. If the effective dose of ticarcillin is proven to be lower than the doses of carbenicillin currently employed for treatment of certain gram-negative infections, bleeding should not be a frequent complication of ticarcillin administration, when the drug is given to patients with normal renal function.

Blood Coagulation↗