An implantable cardiac stimulus system comprising: an implantable medical device (12, 32) including a canister housing operational circuitry coupled to at least three electrodes (16, 20, 22; 36, 38, 40); and a programmer (24, 42) configured to communicate with the implantable medical device (12, 32) after the implantable medical device (12, 32) is implanted in a patient and having a screen for providing display outputs and means for receiving user input; wherein the system is configured to perform sensing vector selection using postural analysis after the implantable medical device (12, 32) is implanted in a patient such that the at least three electrodes (16, 20, 22; 36, 38, 40) define at least first and second sensing vectors analyzable by the operational circuitry, with the improvement comprising the sensing vector selection including: the programmer (24, 42) is configured to indicate via the screen that the patient is to hold a first body position while a first analysis is performed; the implantable medical device (12, 32) is configured to capture data using at least the first and second sensing vectors; the implantable medical device (12, 32) is configured to indicate to the programmer (24, 42) that a first data capture for sensing vector analysis using the first and second sensing vectors is completed; the programmer (24, 42), once the implantable medical device (12, 32) indicates completion of the first data capture for sensing vector analysis, is configured to indicate via the screen that the patient is to hold a second body position while a second analysis is performed; the implantable medical device (12, 32) again is configured to capture data using at least the first and second sensing vectors; the implantable medical device (12, 32) is configured to indicate to the programmer (24, 42) that a second data capture for sensing vector analysis using the first and second sensing vectors is completed; and the programmer (24, 42) is configured to indicate via the screen that the second analysis is complete. an implantable medical device (12, 32) including a canister housing operational circuitry coupled to at least three electrodes (16, 20, 22; 36, 38, 40); and a programmer (24, 42) configured to communicate with the implantable medical device (12, 32) after the implantable medical device (12, 32) is implanted in a patient and having a screen for providing display outputs and means for receiving user input; wherein the system is configured to perform sensing vector selection using postural analysis after the implantable medical device (12, 32) is implanted in a patient such that the at least three electrodes (16, 20, 22; 36, 38, 40) define at least first and second sensing vectors analyzable by the operational circuitry, with the improvement comprising the sensing vector selection including: the programmer (24, 42) is configured to indicate via the screen that the patient is to hold a first body position while a first analysis is performed; the implantable medical device (12, 32) is configured to capture data using at least the first and second sensing vectors; the implantable medical device (12, 32) is configured to indicate to the programmer (24, 42) that a first data capture for sensing vector analysis using the first and second sensing vectors is completed; the programmer (24, 42), once the implantable medical device (12, 32) indicates completion of the first data capture for sensing vector analysis, is configured to indicate via the screen that the patient is to hold a second body position while a second analysis is performed; the implantable medical device (12, 32) again is configured to capture data using at least the first and second sensing vectors; the implantable medical device (12, 32) is configured to indicate to the programmer (24, 42) that a second data capture for sensing vector analysis using the first and second sensing vectors is completed; and the programmer (24, 42) is configured to indicate via the screen that the second analysis is complete. the programmer (24, 42) is configured to indicate via the screen that the patient is to hold a first body position while a first analysis is performed; the implantable medical device (12, 32) is configured to capture data using at least the first and second sensing vectors; the implantable medical device (12, 32) is configured to indicate to the programmer (24, 42) that a first data capture for sensing vector analysis using the first and second sensing vectors is completed; the programmer (24, 42), once the implantable medical device (12, 32) indicates completion of the first data capture for sensing vector analysis, is configured to indicate via the screen that the patient is to hold a second body position while a second analysis is performed; the implantable medical device (12, 32) again is configured to capture data using at least the first and second sensing vectors; the implantable medical device (12, 32) is configured to indicate to the programmer (24, 42) that a second data capture for sensing vector analysis using the first and second sensing vectors is completed; and the programmer (24, 42) is configured to indicate via the screen that the second analysis is complete.