Abstract: A closed-ended catheter assembly that includes an electrically conductive pathway is disclosed. The conductive pathway enables electrical ECG signals from a patient's heart to pass through the closed-ended tip of the indwelling catheter while still preventing unintended fluid flow. In one embodiment, a catheter assembly is disclosed and comprises an elongate catheter tube including a closed distal end. The catheter tube defines a lumen and includes a valve defined in the catheter tube to selectively enable fluids to pass therethrough. The catheter tube includes a conductive element that provides an electrically conductive pathway between the lumen and an exterior portion of the catheter. The conductive element includes an electrically conductive sleeve disposed within the lumen and is positioned proximate a hole defined in a catheter tube wall. The hole enables fluids in a vessel of the patient body in which the catheter tube is disposed to contact the sleeve.