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Enfermería Nefrológica

On-line version ISSN 2255-3517Print version ISSN 2254-2884


SAENZ SANTOLAYA, Alfredo José et al. Comparison of anticoagulation measured using the Inratio® device in samples obtained from the arteriovenous fistula compared to capillary samples. Enferm Nefrol [online]. 2013, vol.16, n.2, pp.99-103. ISSN 2255-3517.

Monitoring of patients treated with Sintrom® has evolved towards capillary blood testing as it is easier to draw blood, less painful, cheaper and immediate results are available. In each haemodialysis session we draw blood from an arteriovenous fistula, which provides a sample for monitoring treatment with Sintrom®, reducing the number of venous punctures without increasing the nursing workload. Objective: To compare the INR results determined using the INRatio® method in capillary and arteriorvenous blood samples. Material and methods: Seven patients with an arteriovenous fistula and on Sintrom® anticoagulation were studied. Three samples were compared: one peripheral, analysed in the laboratory, and the other two using the INRATIO® method for INR analysis in capillary blood. One of the samples was drawn according to the manufacturer´s recommendations, and the other was drawn from the vascular access according to the unit´s protocol. Results: The mean INR determined in the capillary sample was 2.5 ±1; arteriovenous fistula 2.1 ±0.4 and laboratory 2.1 ±0.4. There were no significant statistical or clinical differences. Conclusion: The use of the INRatio® method for determining capillary INR with vascular access samples would be appropriate in haemodialysis as it is equally reliable as the traditional methods. The use of INRATIO measurement device with samples drawn from the arteriovenous fistula presents benefits of facility of access to the sample, simplicity in determining and immediacy in obtaining results, convenience and an economic saving for the healthcare system.

Keywords : International Normalized Ratio (INR); Sintrom® (Acenocumarol); Inratio® Measurement device; Arteriovenous sample; Capillary sample.

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