Abstract: A defibrillation device system includes sensors configured to receive patient data signals and including an ultrasound sensor, a defibrillator coupled to at least one of the sensors and including a screen configured to provide a first user interface, and a processor configured to provide a data display at the first user interface that includes a visual representation of the patient data. The system includes a mobile computing device configured to communicatively couple with the defibrillator at a time of the defibrillator's use and including a screen configured to provide a second user interface, and a processor configured to provide a data display at the second user interface. The second data display includes ultrasound data and a second visual representation of patient data included in the first visual representation, provides playback controls, and modifies the second data display based on user input received via the playback controls.