The authors evaluated the prophylactic protocols with unfractionated heparin (UFH) and warfarin in Japanese patients who underwent total knee arthroplasty (TKA) for osteoarthritis knee in regard to bleeding complications. Fifty-six patients who underwent TKA for osteoarthritis knee with the use of methylmethacrylate were included. Subcutaneous UFH and warfarin were administered for thromboprophylaxis to the first group of 26 patients. The second group of 30 patients did not receive any pharmacological thromboprophylaxis and were used as controls. No significant differences were found between the 2 groups for operative and postoperative blood loss. There were no cases with major bleeding as a complication, but for 2 cases, the international normalized ratio high value exceeded the remedy limits, and temporary dosage discontinuance was required. There were no clinically important bleeding events in the 2 groups. No heparin-induced thrombocytopenia or warfarin-induced skin necrosis occurred. The authors conclude that the protocol with UFH and warfarin is safe for thromboprophylaxis against deep venous thrombosis and pulmonary embolism after TKA in Japanese patients, but its efficacy can only be resolved with further studies.

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Magnesium naphthalocyanine (MgNc) was prepared through two different routes, i. e., from 2, 3-dicyanonaphthalene and Mg in alpha-chloronaphthalene (MgNc-a) and from diiminobenzo-isoindoline and magnesium acetate in tetralin (MgNc-b) and vacuum evaporated onto glass plates. The evaporated films were then examined spectroscopically.The results were • (1) Q band spectra differed with the source of MgNc ; specifically the spectra of MgNc-a varied slightly for each deposited film. (2) Absorption maxima of MgNc-a films were at 780nm and 720nm, the former for amorphous MgNc and the latter for crystalline.(3) MgNc-a tends to be amorphous because of the axial ligation of alpha-chloronaphthalene.(4) Alpha-chloronaphthalene splits off MgNc when the film is heated to the transition point and helps promote the rearrangement of MgNc molecules. MgNc-b does not make thermal transition because there are no solvent molecules effective for the relaxation.(5) For effective thermal transition, the vapor deposition of axially ligated Nc is recommended.

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