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Biomedical subjects

M J Seaman

Publications and source records attributed to M J Seaman.

9 recordsLinked to original sources
PubMed1989

Coagulation changes following hepatic revascularization during liver transplantation.

The coagulation changes during liver transplantation have been studied in 14 selected patients. Blood usage in all cases was limited to 8.5 liters, and the preoperative coagulation results were only minimally deranged. Bleeding during the operative procedure was easily managed in all cases. Nonetheless, even in this selected group of "low risk" patients, we have demonstrated that during the anhepatic phase and particularly following hepatic revascularization there is activation of both coagulation and fibrinolysis. These findings imply that if bleeding occurs following revascularization, in addition to the use of replacement blood products, treatment should be directed at reducing the consumptive coagulopathy and inhibiting fibrinolysis. We suggest as a first step antithrombin supplementation to maintain activity above 70%, and an antifibrinolytic agent, such as aprotonin, should be considered as adjuncts to therapy at revascularization.

Age Factors↗
PubMed1988

Protein C deficiency and portal thrombosis in liver transplantation in children.

Changes in plasma protein C and antithrombin concentrations after liver transplantation were monitored in fourteen children and a control group of fourteen adults. In the children, there was a persistent deficiency in the plasma concentration of protein C and a less pronounced deficiency in antithrombin during the early postoperative period, causing a hypercoaguable state. A concomitant rise in plasminogen activator inhibitor further increased the risk of thrombosis by inhibiting fibrinolysis. These changes coincided with the peak incidence of portal vessel thrombosis (4-10 days). Replacement of plasma antithrombin, together with heparin, did not prevent portal thrombosis in two of the children. It is concluded that successful prevention will require protein C replacement together with antithrombin supplements up to, but not exceeding, normal plasma activity.

Adult↗
PubMed1983

Reduced faecal blood loss in patients receiving choline magnesium trisalicylate ('Trilisate') when compared with aspirin.

A study was carried out in 16 healthy male volunteers to compare the effects on faecal blood loss of comparable daily doses of choline magnesium trisalicylate (3 g) and acetylsalicylic acid (2.4 g) given over a period of 7 days. Faecal blood loss was measured by 51Cr labelling of red cells. Haematological parameters were also monitored. Faecal blood loss and the reduction in haemoglobin levels were significantly less in the choline magnesium trisalicylate group than in the acetylsalicylic acid group. No significant differences were detected in the partial thromboplastin time, prothrombin time or bleeding time in either group.

Adolescent↗
PubMed1969

Liver transplantation in man--IV, Haemorrhage and thrombosis.

Blood coagulation and fibrinolytic factors have been measured in 13 patients treated by liver transplantation. During operation intravascular coagulation and fibrinolysis were increased, but seldom to a degree which would cause abnormal bleeding. Measurement of the catabolism of radioactive fibrinogen showed that increased intravascular coagulation continued for long periods after the operation. Despite secondarily increased fibrinolysis, there was a high incidence of thrombosis. Treatment with anticoagulants or with fibrinolysis inhibitors may be valuable in these patients.

Adult↗