An EKG monitor/recorder and defibrillator which are contained in separate housings are mechanically interconnected by a tongue member located on an exterior surface of the housing of the EKG monitor/recorder and a groove member located on an exterior surface of the housing of the defibrillator. The groove member receives the tongue member with a translative, sliding fit to also permit easy disconnection and separation of the EKG monitor/recorder and the defibrillator. Electrical interconnection between the EKG monitor/recorder and the defibrillator is afforded by a pair of novel electrical slide connectors respectively located in the exterior surfaces of the housings in proximity to the tongue and groove members, with each electrical slide connector including a plurality of spaced-apart leaf spring contacts which, in assembly, extend parallel to the direction of translative movement of the EKG monitor/recorder and defibrillator housings. Circuitry is provided within the EKG monitor/recorder and defibrillator for providing EKG monitoring through paddle electrodes of the defibrillator by coupling the paddle electrodes to the EKG monitor/recorder through the pair of electrical slide connectors.