A method, apparatus, system, and computer program product example embodiments of the invention are disclosed to reduce interference of predictive signal transmissions between wireless devices. Disclosed embodiments include a method for assessing fluid responsiveness implemented in a digital computer with one or more processors comprising: measuring a cardiovascular signal, and computing a dynamic index predictive of fluid responsiveness from said cardiovascular signal using a nonlinear state space estimator. Any one of the other cores, such as a second core, may received packets related to the session owned by the first core. The resistance of the MTJ core therefore varies with respect to changes in the pressure. Other medical devices, such as an angioplasty, stent, or atherectomy catheter, can be inserted distal the expandable member to provide additional therapeutic intervention. The materials of construction are selected to also enhance trouble-free operation.