{'fraction_non_alphanumeric': 0.04240282685512368, 'fraction_numerical': 0.034746760895170786, 'mean_word_length': 5.111510791366906, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[An Analysis of Autologous Blood Transfusion in Major Orthopedic Surgery : Our Experience with 2,262 Patients.]

BACKGROUND
Allogenic blood transfusion accompa- nies the risks of infection, allergic reaction, and immune suppression. We analyzed the patients having autolo- gous blood transfusion in major orthopedic surgery in our hospital.


METHODS
We analyzed 2,262 patients scheduled for autologous transfusion for the last 22 years (from Sep- tember 1991 to September 2013) retrospectively. Autologous transfusion was scheduled alone or com- bined with two or three methods, that is, preoperative donation, acute hemodilution, or blood salvage, accord- ing to the type of surgery and intra- and post-opera- tive blood loss.


RESULTS
Almost all the cases were major orthopedic surgeries, e. g., total hip arthroplasty (primary, unilat- eral THA, 1,281 patients, revision THA, 84 patients), total knee arthroplasty (primary TKA, 519 patients), rotational acetabular osteotomy and curved periace- tabular osteotomy (RAO and CPO, 145 patients), and scoliosis surgery (44 patients). For predonation, autolo- gous blood of 400-800 ml was obtained from all patients and supplemented with 400-800 ml of acute hemodilution during preoperative period and 200-400 ml of salvage during the intra- and post-operative period. As a result, 260 cases (11%) received allogenic blood transfusion, and 13 cases (0.5%) developed vasovagal reflex during drawing blood, and one patient died the day after drawing blood not related with predonation.


CONCLUSIONS
The use of autologous transfusion would be useful for avoiding or reducing homologous transfusion requirements in scheduled orthopedic major surgeries.