Key result
Patients with aortic valve stenosis had significantly prolonged epinephrin/collagen closure times compared to healthy controls (210 vs 140 sec, p<0.0001), correlating with transfusion requirements.
Why the study?
Do platelet-function analyzer closure times correlate with perioperative transfusion requirements in patients with aortic valve stenosis undergoing aortic valve replacement?
Observational (n=50)
Do platelet-function analyzer closure times correlate with perioperative transfusion requirements in patients with aortic valve stenosis undergoing aortic valve replacement?
Prolonged platelet-function analyzer closure times are prevalent in aortic valve stenosis and correlate with increased perioperative red blood cell transfusion requirements during valve replacement.
Answers are grounded in this paper and cite their sources.
May identify transfusion risk in aortic stenosis; leaves open whether closure-time testing should guide perioperative management.
BACKGROUND: Shear stress-induced hemostatic abnormalities are highly prevalent in patients with aortic valve stenosis. In this study, we determined closure times with a platelet-function analyzer (PFA-100, Dade Behring, Marburg, Germany) in patients admitted for aortic valve replacement to assess the correlation with the severity of aortic valve stenosis, blood loss, perioperative transfusion requirements, and need for re-thoracotomy. PATIENTS AND METHODS: Fifty consecutive patients (mean age [+/- SD] 68 +/- 9 years) were enrolled. Closure times of epinephrin/collagen and adenosine diphosphate (ADP)/collagen cartridges were determined at least ten days after discontinuation of antiplatelet medication and compared to those of healthy control subjects without medication. RESULTS: Closure times of epinephrin/collagen (210 +/- 69 sec vs. 140 +/- 50 sec, p < 0.0001) and ADP/collagen (145 +/- 58 sec vs. 108 +/- 45 sec, p < 0.0001) cartridges were prolonged in patients with aortic valve stenosis. Intraoperative transfusion of red blood cell units was associated with the closure times of epinephrin/collagen (r = 0.28, p = 0.04) and ADP/ collagen cartridges (r = 0.28, p = 0.04). Total transfusion of red blood cell units was associated with ADP/ collagen closure times (r = 0.31, p = 0.02), but not epinephrin/collagen closure times (r = 0.26, p = 0.07). No significant association of closure times with intraoperative, postoperative and total transfusion of fresh frozen plasma units was observed. CONCLUSIONS: Prolongation of closure times determined with a platelet-function analyzer is highly prevalent in patients with aortic valve stenosis and appears to reflect shear stress-induced hemostatic abnormalities. Since prolonged closure times are associated with increased perioperative transfusion of red blood cell units, the assay could significantly contribute to the identification of individuals at risk.
No takes yet. Share an insight, caveat, or question.
Sucker et al. (2010) conducted an observational in Aortic valve stenosis (n=50). Aortic valve stenosis vs. Healthy control subjects without medication was evaluated on Closure times of epinephrin/collagen cartridges (p=<0.0001). Patients with aortic valve stenosis had significantly prolonged epinephrin/collagen closure times compared to healthy controls (210 vs 140 sec, p<0.0001), correlating with transfusion requirements.
Synapse has enriched 10 related papers. Consider them for comparative context: