An implantable medical device system is configured to detect a tachyarrhythmia from a cardiac electrical signal and start an ATP therapy delay period. The implantable medical device determines whether the cardiac electrical signal received during the ATP therapy delay period satisfies ATP delivery criteria. A therapy delivery module is controlled to cancel the delayed ATP therapy if the ATP delivery criteria are not met and deliver the delayed ATP therapy if the ATP delivery criteria are met.

A method for a wearable cardioverter defibrillator (WCD) system comprises sensing one or more patient parameters from different parts of a body of the patient by the one or more transducers, obtaining a plurality of physiological inputs from the sensed one or more patient parameters, detecting first aspects from each of at least some of the physiological inputs, generating an aggregated first aspect from at least two of the detected first aspects, determining an aggregate analysis score from the aggregated first aspect, and determining whether the aggregate analysis score meets an aggregate shock criterion. The electrical charge is discharged within six minutes from when it is determined that the aggregate shock criterion is met, otherwise the electrical charge is not discharged for at least 19 minutes from when it is determined that the aggregate shock criterion is not met.

Implantable medical electrical leads having electrodes arranged such that a defibrillation coil electrode and a pace/sense electrode(s) are concurrently positioned substantially over the ventricle when implanted as described. The leads include an elongated lead body having a distal portion and a proximal end, a connector at the proximal end of the lead body, a defibrillation electrode located along the distal portion of the lead body, wherein the defibrillation electrode includes a first electrode segment and a second electrode segment proximal to the first electrode segment by a distance. The leads may include at least one pace/sense electrode, which in some instances, is located between the first defibrillation electrode segment and the second defibrillation electrode segment.

A cardiac lead system is provided. The lead is placed epicardially through the transverse pericardial sinus with integrated curvatures to prevent the lead from slipping out of the transverse pericardial sinus. Interaction with multiple chambers of the heart is facilitated in a single lead, without anchors that embed into the heart wall. Multiple electrodes can be grouped over each targeted heart area to ensure adequate electrical contact.

A wearable therapeutic device includes an external defibrillator configured to monitor electrical heart activity of a patient and a garment housing a first therapy electrode and a second therapy electrode. The first and second therapy electrodes are electrically coupled to the defibrillator. The garment releasably receives a plurality of replaceable receptacles configured to store a conductive gel in locations proximate to the therapy electrodes. A plurality of gas cartridges each disposed on one of the plurality of replaceable receptacles are configured to control a release of the stored conductive gel of the associated one of the plurality of replaceable receptacles by igniting. A plurality of conductive gel firing circuits each associated with and separate from each of the plurality of replaceable receptacles are configured to be operatively coupled to the gas cartridge to control the release of the stored conductive gel upon information being communicated from the external defibrillator.

A wearable medical system configured to be worn by a person, comprising a support structure configured to be worn by the person, a monitoring device configured to monitor at least one physiological parameter of the person, wherein the at least one physiological parameter includes an electrocardiogram (ECG) reading of the person, an electrode coupled to the support structure, an energy storage device configured to store an electric charge for use in delivering a shock to the person through the electrode, and a biasing mechanism comprising at least one of an inflatable device, a hydraulic device, an electromagnetic device, and/or a screw gun device, the biasing mechanism configured to transition from the unbiased state to the biased state responsive to a value of the at least one physiological parameter reaching a threshold. The electrode is more movable with respect to the person's body in the unbiased state than the biased state.

A method and system are provided. The method and system sense cardiac events of a heart. The method and system utilizes one or more processors. The processors detect a ventricular fibrillation (VF) episode based on the cardiac events and identify a pace-assisted VF therapy based on the ventricular fibrillation episode. The pace assisted VF therapy includes a burst pacing therapy and a high voltage (HV) shock. The method and system deliver the burst pacing therapy at one or more pacing sites in a coordinated manner before or during the HV shock. The one or more pacing sites includes at least one of a left ventricular (LV) site or a right ventricular (RV) site. The method and system deliver the HV shock along a shocking vector between shocking electrodes.

A wearable monitoring and therapeutic device includes at least two sensing electrodes, including at least one of conductive thread sewn into a garment and/or a metallic surface sewn into the garment. The device includes at least two therapy electrodes and the garment, wherein the garment is configured to be worn about a torso of a subject. The garment includes a breathable and stretchable fabric, an elastic material, and a loose material. The device includes at least one defibrillator component including a power source, a conductive wiring configured to stretch to accommodate the subject's chest size and enhance comfort and couple any of the at least two therapy electrodes and the at least two sensing electrodes to the at least one defibrillator component, an alarm module operatively coupled to the at least one defibrillator component, and one or more response buttons operatively coupled to that at least one defibrillator component.

In some embodiments, a wearable medical device system includes a processor configured to determine whether a patient requires electrical therapy to be provided via a plurality of therapy electrodes, the electrical therapy comprising discharging at least a portion of a stored electrical charge from an energy storage module, and if so, cause a fluid deploying mechanism to deploy a portion of the stored fluid to an interface between at least two therapy electrodes and the patient's skin prior to providing the electrical therapy, the deployed portion of fluid adapted to decrease the impedance measured by an impedance measurement circuit, and cause the fluid deploying mechanism to deploy an additional portion of fluid in response to the impedance measured by the impedance measurement circuit increasing above a threshold during the electrical therapy.

A defibrillation device for administering an electrotherapy, such as a dual-sequential defibrillation (DSD) electrotherapy. The defibrillation device can include a defibrillation therapy module, a physiological parameter module and a control module. The defibrillation therapy module can output one or more energies and the physiological parameter module can receive one or more physiological parameters, including electrocardiogram (ECG) data. The control module can analyze the physiological parameters to determine an indication for the administration of an electrotherapy and can determine a DSD electrotherapy. The DSD electrotherapy can be based at least in part on the physiological parameters, the indication for the administration of an electrotherapy or a review of the ECG data.