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This document discusses, among other things, a modular antitachyarrhythmia therapy system. In an example, a modular antitachyarrhythmia system includes at least two separate modules that coordinate delivery an antitachyarrhythmia therapy, such as defibrillation therapy. In another example, a modular

This document discusses, among other things, a modular antitachyarrhythmia therapy system. In an example, a modular antitachyarrhythmia system includes at least two separate modules that coordinate delivery an antitachyarrhythmia therapy, such as defibrillation therapy. In another example, a modular antitachyarrhythmia therapy system includes a sensing module, an analysis module, and a therapy module.

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1. An implantable cardiac stimulus device for use in a patient having a heart, comprising: a housing containing sensing circuitry and therapy circuitry for providing cardiac stimulus, the housing adapted for coupling to a lead having at least one electrode thereon;the implantable cardiac stimulus de

1. An implantable cardiac stimulus device for use in a patient having a heart, comprising: a housing containing sensing circuitry and therapy circuitry for providing cardiac stimulus, the housing adapted for coupling to a lead having at least one electrode thereon;the implantable cardiac stimulus device being configured for implantation, sensing and therapy delivery from outside the heart, using a lead also implanted outside the heart;wherein the implantable cardiac stimulus device is configured to communicate, using the patient's body as a conductive medium for communication, with a physically separate first module adapted for implantation in the patient, and to receive data related to respiration from the first module. 2. The implantable cardiac stimulus device of claim 1, further configured to communicate, using the patient's body as a conductive medium for communication, with a physically separate second module adapted for implantation in the patient, to receive data related to cardiac electrical activity from the second module. 3. The implantable cardiac stimulus device of claim 2, further configured to receive data related to at least one of ventricular sensing and atrial sensing from the second module. 4. The implantable cardiac stimulus device of claim 2, further configured to send a message related to an antitachyarrhythmia output to one of the first or second modules. 5. The implantable cardiac stimulus device of claim 1, further configured to send a message related to an antitachyarrhythmia output to the first module. 6. An implantable cardiac stimulus device for use in a patient having a heart, comprising: a housing containing sensing circuitry and therapy circuitry for providing cardiac stimulus, the housing adapted for coupling to a lead having at least one electrode thereon;the implantable cardiac stimulus device being configured for implantation, sensing and therapy delivery from outside the heart, using a lead also implanted outside the heart;wherein the implantable cardiac stimulus device is configured to communicate, using the patient's body as a conductive medium for communication, with a physically separate first module adapted for implantation inside the heart of the patientfurther configured to receive data related to blood pressure from the first module. 7. The implantable device of claim 6 wherein the device is further configured to receive data related to electrical cardiac activity from the first module. 8. An implantable cardiac stimulus device for use in a patient having a heart, comprising: a housing containing sensing circuitry and therapy circuitry for providing cardiac stimulus, the housing adapted for coupling to a lead having at least one electrode thereon;the implantable cardiac stimulus device being configured for implantation, sensing and therapy delivery from outside the heart, using a lead also implanted outside the heart;wherein the implantable cardiac stimulus device is configured to communicate, using the patient's body as a conductive medium for communication, with a physically separate first module adapted for implantation inside the heart of the patientfurther configured to receive data related to heart sounds from the first module. 9. The implantable device of claim 8 wherein the device is further configured to receive data related to electrical cardiac activity from the first module. 10. An implantable cardiac stimulus system for use in a patient having a heart, comprising: a housing containing sensing circuitry and therapy circuitry for providing cardiac stimulus;a lead having at least one electrode thereon and configured for coupling to the housing;the housing and lead being configured for implantation, sensing and therapy delivery from outside the heart;wherein the implantable cardiac stimulus system is further configured to communicate, using the patient's body as a conductive medium for communication, with a physically separate first module adapted for implantation inside the heart of the patient; andwherein the system is further configured to receive data related to respiration from the first module. 11. The implantable cardiac stimulus system of claim 10, further configured to communicate, using the patient's body as a conductive medium for communication, with a physically separate second module adapted for implantation in the patient. 12. The implantable cardiac stimulus system of claim 11, further configured to receive data related to electrical cardiac activity from the second module. 13. The implantable cardiac stimulus system of claim 11, further configured to receive data related to cardiac electrical activity and/or data related to blood pressure from the second module. 14. The implantable cardiac stimulus system of claim 11, further configured to receive data related to cardiac electrical activity and/or data related to heart sounds from the second module. 15. The implantable cardiac stimulus system of claim 11, further configured to send a message related to an antitachyarrhythmia output to one of the first or second modules. 16. The implantable cardiac stimulus system of claim 10, further configured to send a message related to a therapy output to the first module. 17. An implantable system comprising: first means for sensing cardiac data and determining whether an arrhythmia requiring therapy is ongoing; andsecond means for delivering anti-arrhythmia therapy and configured to communicate with the first means using the body of a patient as a conductive medium for communication, wherein the second means is configured to determine, using information communicated by the first means, whether and when to deliver anti-arrhythmia therapy;wherein the first means is configured for communication with the second means using the body of the patient as a conductive medium for communication to the second means, including communication of data related to respiration; andwherein at least one of the first means and second means is sized and configured for placement inside the heart of the patient, and the other of the first means and second means is sized and configured for placement outside the heart of the patient. 18. The implantable system of claim 17 wherein the first means is configured to detect electrical cardiac signals, the system further comprising third means for capturing non-electrical data indicative of whether an arrhythmia requiring therapy is ongoing and communicating to at least one of the first means and the second means using the body of the patient as a conductive medium for communication. 19. The implantable system of claim 17 wherein the first means is configured for implantation in the heart of the patient and second means is configured for subcutaneous implantation outside of the heart of the patient. 20. The implantable system of claim 17 wherein the second means is configured for implantation in the heart of the patient and first means is configured for subcutaneous implantation outside of the heart of the patient.