The aim is to determine the prevalence of catheter-related thrombosis (CRT) in hospitalized patients carrying PICC, FICC, CICC, and midline catheters through a multicenter, standardized prevalence study. To achieve this, a cross-sectional study with prospective data collection will be conducted, including, through consecutive sampling to minimize selection bias, all hospitalized patients over 18 years of age from both general wards and critical care units who have had one of these catheters in place for at least 7 days. During data collection, an ultrasound examination of the catheter insertion site will be performed in order to rule out the presence of thrombotic complications.

Inclusion Criteria:

• All hospitalized patients aged ≥18 years from all hospital wards, including critical care units, who are carriers of a midline, FICC, PICC, or CICC catheter with a dwell time of at least 7 days will be included.

Exclusion Criteria:

• Patients who do not provide informed consent for the ultrasound assessment.

The study will be conducted across the following centers: Complejo Hospitalario Universitario Nuestra Señora de Candelaria, Hospital del Mar, Hospital Sant Joan de Déu-Althaia, Hospital Universitari Joan XXIII, Hospital Universitario de Navarra, Hospital Universitario Doctor Josep Trueta, Hospital Universitario Donostia, Hospital Universitario Mutua Terrassa, Hospital Universitario Son Espases, Policlínica Gipuzkoa, and Hospital de Navarra. Participation will include hospital institutions with an Infusion and Vascular Access Unit (IVAU) that has institutionally recognized expertise in the detection of catheter-related thrombosis (CRT).