A hands-free cardiopulmonary resuscitation (CPR) guidance method (40) for a system including a head-mountable computing device (100) comprising a processor (110) and at least one display module (106, 106′) arranged to be viewed by the wearer (20) of the head-mountable computing device when wearing the device is disclosed that allows a rescuer to receive CPR guidance without losing sight of the victim. The method comprises receiving (420), on said processor, a first signal conveying vital signs information from at least one sensor (200, 210) for monitoring vital signs of a patient (10), wherein a sensor (210) of the at least one sensor is integrated in the head-mountable computing device (100); processing said first signal on said processor to obtain the vital signs information; and displaying (422) CPR guidance on said at least one display module in response to the processed vital signs information. A computer program product and a CPR guidance system are also disclosed. The system may be created in situ using ubiquitous devices, e.g. smart devices including usable sensors, thus facilitating rapid response to an SCA event, which improves the chances of survival of a SCA victim.