Efecto en pruebas de coagulación del procedimiento de extracción desde catéter reservorio vascular subcutáneo

Abstract

Introduction: The number of patients with Implantable Venous-Access Port Systems (IVAPS) seen in Phlebotomy Outpatients, as well as requests for drawing blood samples through this system instead of conventional venepuncture, are continuously increasing. The aim of this study was to assess if drawing blood samples through IVAPS, despite using a specific procedure, may alter results of basic blood coagulation tests. Material and methods: We studied 10 patients with IVAPS, who came to Phlebotomy Outpatients at our hospital, and who were attended to by two nurses with experience in handling these devices. Two samples were obtained from each patient, one of them drawn through IVAPS, and the other by peripheral venepuncture, and the results for blood coagulation tests (Prothrombin Time-PT, PT derived Fibrinogen, Activated Partial Thromboplastin Time-APTT and D-Dimer) were evaluated. Results: Statistically and clinically significant differences were found, for APTT, between IVAPS and venepuncture: mean values were, respectively, 24.9 s and 27.9 s (P < .05). No other results (PT, PT derived Fibrinogen or D-Dimer) showed statistically significant differences. Conclusions: The difference observed in APTT results between samples drawn through IVAPS compared to samples obtained by venepuncture, suggests that peripheral venepuncture should be used in these patients. The use of IVAPS is convenient for the patient, but it is not always recommended, as it may lead to laboratory errors.