Disclosed is a hemodynamic monitoring system, and method and associated harness device. The method and system are configured to allow a user that has received a permanent sensing implant within their vasculature to place a reader device in a hands free manner in communication with the implant through the chest of the user to measure at least one hemodynamic parameter such as pulmonary artery pressure. The reader device may be worn by the patient with a harness device to be configured to wirelessly communicate with said implant when the patient is in a specific patient state, such as resting, exercising, recovering, seated, or supine. The reader may be configured to take measurements from the implant when the patient is in the specific patient state, in order to acquire data from said implant related to said parameter and to upload said data to an external device.