Introduction: Central venous catheterization is characterized by positioning a vascular device whose end reaches the final third of the superior vena cava, regardless of the insertion site. Most patients with cardiopulmonary diseases are elective for its implementation, for presenting a fragile peripheral venous network and need for prolonged infusion solutions. However, this procedure presents invasive character associated with complications. Aim: Analyze the complications related to the use of non-tunneled semi-implantable central venous catheter. Methods: A prospective cohort study (6 months) conducted in intensive care units and medicalsurgical clinics from the Heart Institute of the Medicine Course in University of São Paulo (USP), in adult patients with cardiopulmonary diseases in using peripherally inserted central catheter (PICC) or double lumen catheter (CDL), the daily observation of the catheter until its withdrawal or hospital discharge, associated with access to medical records for information on the patient and the catheter conditions. Study variables related to morbidity and demographics data, catheter insertion, use and maintenance, complications related to the use of catheter, catheter removal. Anlysis: Measures of central tendency and variability, chi-square test or Mann-Whitney test for qualitative data, student's t-test and ANOVA or Kruskal-Wallis test to compare means. Results: There was a predominance of CDL, used in 127 (67.2%) cases, and the PICC in 62 (32.8%). As of the catheters, 55 (43.3%) CDL and 21 (37.0%) PICC had some type of complication. There was a statistical difference (p = 0.017) among the complications according to the types of PICC, being it higher in the open ended ones. There were differences between the complications according to the insertion sites, however, with no statistical difference (p = 0.479). Obstruction occurred in only 3.9% (5) of the CDL, while in PICCs it was present in 11.3% (7) of the cases. The phlebitis grade 1 was present in 23 (18.1%) cases of CDL and 10 (16.1%) cases of PICC. The purulent exudate in the CDL was observed in 9 (7.0%) cases while in PICC was present in only 1 (1.6%) device. The manifestation was present only in the CDL, occurring in 9 (7%) cases. The suspicion of thrombosis was seen in 3 (4.8%) PICC being confirmed in only 1 (1.6%) of them, as well as the rupture present in only 1 (1.6%) PICC. The CDL length of stay was 8.8 (± 6.8) days on average (median 8) ranging from 1 to 38 days. In the case of PICC, it averaged 19.4 (± 21) days (median 14) and ranged 1-141 days. The suspected infection was the majority, being present in CDL in 30 (23.6%) cases and in PICC in 9 (14.5%). In only 1 (2.6%) CDL a bloodstream infection associated with the catheter was confirmed, with tipped catheter and positive blood culture for Chryseobacterium indologenes. Conclusion: The suspected infection was the complication with highest incidence, but confirmed in only one of the cases. There was no statistical difference between the densities of incidence of com...