In some examples, an apparatus configured to be worn by a patient for cardiac defibrillation comprises sensing electrodes configured to sense a cardiac signal of the patient, defibrillation electrodes, therapy delivery circuitry configured to deliver defibrillation therapy to the patient via the defibrillation electrodes, communication circuitry configured to receive data of at least one physiological signal of the patient from at least one sensing device separate from the apparatus, a memory configured to store the data, the cardiac signal, and a machine learning algorithm, and processing circuitry configured to apply the machine learning algorithm to the data and the cardiac signal to probabilistically-determine at least one state of the patient and determine whether to control delivery of the defibrillation therapy based on the at least one probabilistically-determined patient state.

A wearable medical device is provided. The device includes electrodes to receive electrical signals from a patient, monitor for a cardiac arrhythmia, and provide a therapeutic shock to the patient in response to detecting the arrhythmia. The device includes a user interface to receive patient input indicating initiation or termination of a high-noise activity. The device can include accelerometers to generate motion signals. The device includes a processor to monitor for initiation or termination of the high-noise activity based on a noise level in the electrical signals, the motion signals, and the patient input. The processor can cause, in response to the initiation of the high-noise activity, an arrhythmia detection process to execute in an activity-induced noise (AIN) robust mode, and cause, in response to the termination of the high-noise activity, the arrhythmia detection process to execute in an AIN sensitive mode.

A supportive clothing article for a wearable cardioverter defibrillator (WCD), including a belt, the belt including a first end with a first portion of a fastener and a second end with a second portion of the fastener, wherein the belt is structured to fasten around the torso of patient below the chest area of the patient, the belt including a first conductive mesh portion adjacent the first end of the belt or the second end of the belt, two straps, a back portion extending from the belt at an intermediary position on the belt to each of the two straps, the back portion including a conductive mesh, a first support receptacle attached to and extending from the belt and attachable to one of the two straps, and a second support receptacle attached to and extending from the belt and attachable to the other of the two straps.

A wearable cardioverter defibrillator (WCD) comprises a support structure to be worn by a patient, an energy storage module to store an electrical charge, a discharge circuit coupled to the energy storage module, a measurement circuit, a user interface that includes a speaker, and a processor. The processor is configured to monitor a physiological signal of a patient with the measurement circuit to detect cardiac arrythmia when the patient is wearing the support structure, determine whether a validation criterion is met in response to detection of a cardiac arrythmia, provide no alarm with the user interface the validation criterion is being determined, and cause a shock to be delivered to the patient from the energy storage module by the discharge circuit in the event the validation criterion is met

An external defibrillator system is configured with at least two different algorithms for determining the duration of a shock administered to a patient being treated and selects the algorithm based on one or more patient parameters such as, for example, the patient's TTI. The patient's TTI can be measured prior to or while the shock is being administered to the patient. The shock can be, for example, a multiphasic defibrillation or a multiphasic cardioversion shock. The charge voltage of the system's energy storage device can additionally be varied depending on the one or more patient parameters. For example, the system may charge the energy storage device so that the charge voltage is higher or lower than a nominal charge voltage responsive to the patient's TTI is higher or lower compared to an average TTI, respectively.

A defibrillation system for the administration of a dual sequential defibrillation and/or simultaneous defibrillation therapy. A first defibrillation device is inductively coupled to a second defibrillation device. An energy delivery of the first defibrillation device generating, or causing to be generated, an artifact that is received by the second defibrillation device. The artifact causing a sync mode, or sync mode circuitry, of the second defibrillation device to administer a second energy delivery. The second energy delivery can be delayed relative to the energy delivery by the first defibrillation device.

System and methods for delivering defibrillator incident information to a PSAP in real-time during emergency use of an AED are described. Such information is utilized by a telecommunicator at a PSAP to provide better guidance to volunteer caregivers during potential cardiac arrest incidents. In another aspect the AED's current instruction state and optionally the time in that state is provided to the PSAP.

A supportive clothing article for a wearable cardioverter defibrillator (WCD), including a belt, the belt including a first end with a first portion of a fastener and a second end with a second portion of the fastener, wherein the belt is structured to fasten around the torso of patient below the chest area of the patient, the belt including a first conductive mesh portion adjacent the first end of the belt or the second end of the belt, two straps, a back portion extending from the belt at an intermediary position on the belt to each of the two straps, the back portion including a conductive mesh, a first support receptacle attached to and extending from the belt and attachable to one of the two straps, and a second support receptacle attached to and extending from the belt and attachable to the other of the two straps.

In some examples, an apparatus configured to be worn by a patient for cardiac defibrillation comprises sensing electrodes configured to sense a cardiac signal of the patient, defibrillation electrodes, therapy delivery circuitry configured to deliver defibrillation therapy to the patient via the defibrillation electrodes, communication circuitry configured to receive data of at least one physiological signal of the patient from at least one sensing device separate from the apparatus, a memory configured to store the data, the cardiac signal, and a machine learning algorithm, and processing circuitry configured to apply the machine learning algorithm to the data and the cardiac signal to probabilistically-determine at least one state of the patient and determine whether to control delivery of the defibrillation therapy based on the at least one probabilistically-determined patient state.

A wearable cardioverter defibrillator (WCD) (10) and method (60) comprise a set of electrodes (12) for placement on a subject (14), a mechanism for electrically engaging (16) the set of electrodes to the subject's skin, and at least one non-invasive physiologic sensor (18, 20) configured for placement on the subject. A controller (24) monitors an output of the non-invasive physiologic sensor (18, 20) for detecting a change in a health parameter of the subject being indicative of one or more of a change in subject condition that may be a precursor to potential cardiac arrhythmia or a simultaneously occurring cardiac arrhythmia. Responsive to detecting the change, the controller (24) activates an alarm (26) for requesting a response from the subject (14) within a predetermined time. Responsive to receiving the subject's response within the predetermined time, the controller (24) inhibits the mechanism (16) from electrically engaging the set of electrodes (12) to the subject's skin. Responsive to not receiving the subject's response, the controller (24) initiates the mechanism (16) for electrically engaging the set of electrodes (12) to the subject's skin.