Moulding Characteristics of Natural Moulding Sand Received from M/S Supertech Castings Ltd. Madras.

This investigation was taken up to study the moulding characteristics of the natural moulding sand received from M/s. Supertech Castings Limited, Saidapet, Madras. The sand, as received, was reddish-brown in colour. The grains were sub-angular to rounded in shape

Moulding Characteristics of Natural Moulding Sand Received from M/S Model Foundry, Madras-32.

This investigation was undertaken to study the moulding characteristics of sand received from M/S Model Foundry, Guindy, Madras-32. The sand, as received was dull brown in colour. Standard methods as specified by the American Foundry men’s Society for testing Sand were employed throughout the investigation using the Metrimplex Hungarian Sand Testing Equipments. Values reported are an average of three readings

Lack of alloimmunization to the D antigen in D-negative orthotopic liver transplant recipients receiving D-positive red blood cells perioperatively

BACKGROUND AND OBJECTIVES: D-negative patients undergoing orthotopic liver transplantation (OLT) might require a large number of red blood cell (RBC) units, which can impact the inventory of D-negative blood. The blood bank might need to supply these patients with D-positive RBCs because of inventory constraints. This study evaluates the prevalence of anti-D formation in D-negative OLT patients who received D-positive RBCs perioperatively, as this will assist in successful patient blood management. MATERIALS AND METHODS: This was a retrospective study performed at a single academic medical centre. Electronic medical records for all 1052 consecutive patients who underwent OLT from January 2007 through December 2017 were reviewed. D-negative patients who were transfused perioperatively with D-positive RBCs and had antibody screening at least 30 days after transfusion were included. RESULTS: Of a total of 155 D-negative patients, 23 (14.8%) received D-positive RBCs perioperatively. Seventeen patients were included in the study. The median age was 54 years (range 36-67 years); 13 (76.5%) were male. The median number of D-positive RBC units transfused perioperatively was 7 (range 1-66 units). There was no evidence of D alloimmunization in any patient after a median serologic follow-up of 49.5 months (range 31 days to 127.7 months). The average number of antibody screening post OLT was 7.29. CONCLUSION: Our study showed that transfusion of D-positive RBCs in D-negative OLT recipients is a safe and acceptable practice in the setting of immunosuppression. This practice allows the conservation of D-negative RBC inventory