A vascular access device including a hollow introducer sheath configured to receive a catheter. The sheath is insertable into a blood vessel. The device includes a plurality of electrodes on the introducer sheath, a signal generator coupled to at least two of the plurality of electrodes, and a measurement unit coupled to at least two of the plurality of electrodes. The device further includes a controller coupled to the signal generator and to the measurement unit. The controller is configured to use the measurement unit to obtain impedance values, determine that a bleed is occurring from the impedance values, and in response to the determination that a bleed is occurring, constrict the blood vessel through application of an electrical signal by the signal generator.
