an adapter , which allows the use of a complex multi - electrode pacing and sensing cardiac lead with a conventional one - channel cardiac pacing pulse generator has a connector that attaches to the multi - electrode cardiac lead , a multiplexer to select which of the electrodes of the multi - electrode cardiac lead are to be connected to the one channel cardiac pacing pulse generator , and a connector to connect the adapter to a connector such as the industry standard is - 1 connector . new therapies are developing requirements for both optimum - site pacing and multi - site pacing to improve cardiac hemodynamics . these therapies require custom pulse generators that are capable of connecting to the multiple - electrode configurations required . this adapter allows a conventional one - channel cardiac pacing pulse generator to be connected to a multi - electrode cardiac lead and steers the output pulse to the desired set of electrodes .