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  • Title: Fibrinogen levels following Amicar in surgery for idiopathic scoliosis.
    Author: Thompson GH, Florentino-Pineda I, Armstrong DG, Poe-Kochert C.
    Journal: Spine (Phila Pa 1976); 2007 Feb 01; 32(3):368-72. PubMed ID: 17268270.
    Abstract:
    STUDY DESIGN: Prospective evaluation of fibrinogen levels before surgery and after surgery in patients with idiopathic scoliosis undergoing posterior spinal fusion (PSF) and segmental spinal instrumentation (SSI) who received Amicar to decrease perioperative blood loss. OBJECTIVES: To assess a possible association between postoperative fibrinogen levels and Amicar administration. SUMMARY OF BACKGROUND DATA: Our previous randomized, double-blind (Amicar and control) study demonstrated a rise in fibrinogen levels on the first postoperative day in the Amicar group, but not in the control group. Fibrinogen levels were not measured on the remaining postoperative days. We subsequently measured fibrinogen levels on all postoperative days in 21 consecutive patients with idiopathic scoliosis and found a dramatic increase throughout the postoperative hospitalization. This study is a continuation of our analysis of postoperative fibrinogen levels. METHODS: We analyzed fibrinogen levels before surgery and on all postoperative days (4 or 5 days) until discharge in 51 consecutive patients, including our 21 previously reported patients, who received Amicar and underwent a PSF and SSI. We also analyzed the same factors with respect to perioperative blood loss as in our previous Amicar studies. RESULTS: There were 41 females and 10 males with a mean age at surgery of 14.2 +/- 1.8 years. Their mean hospitalization was 4.6 +/- 0.8 days. Their mean estimated intraoperative blood loss was 766 +/- 308 mL and postoperative suction drainage 532 +/- 186 mL for a total perioperative blood loss of 1297 +/- 311 mL. The perioperative transfusion requirements were 0.5 +/- 0.6 U per patient. The preoperative fibrinogen was 255.5 +/- 58.3 mg/dL, and it rose steadily throughout the postoperative period to 680.9 +/- 111.9 mg/dL on the fifth postoperative day. There were no complications related to the use of Amicar. CONCLUSIONS: Fibrinogen levels rise steadily throughout the postoperative period. The significance of this increase is unknown. Was it due to the use of Amicar or just the effects of surgery itself? Further investigations will be necessary.
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