allows the bladder to be re used the liner may be designed for use as part of a belt or other compression means or the liner may merely cover the bladder without additional features thus the pad and liner may be easily attached to a means for compressing the chest the liner may comprise a low friction water resistant non resilient material such as ptfe eptfe both are teflon u00ae or similar materials the liner may cover one or more surfaces of the bladder part of a bladder surface or the entire bladder in addition one or more surfaces of the bladder may be coated with or made of ptfe eptfe both are teflon u00ae or similar materials the bladder may also be provided with an integrated defibrillation device with ecg and defibrillation electrodes and or other electrodes to measure impedance the ecg and defibrillation electrodes which may be the same electrodes as the impedance measurement electrodes may be break away electrodes that break off the surface of the pad when the pad is removed from the patient the electrodes then remain on the patient 39 s chest for continued use in monitoring the patient the bladder may also be provided with one or more means for measuring biological feedback parameters of interest to medical personnel including.