An electrode assembly for patient monitoring and treatment can include an electrode configured to be worn by a patient to provide at least one of monitoring a cardiac function of the patient and delivering a treatment for cardiac arrhythmia to the patient； and a first connector connected to and in communication with the electrode, the first connector including a male connection portion. The male connection portion is configured to engage a second connector to form a mating engagement between the first connector and the second connector. The male connection portion includes at least one orientation aligning feature configured to engage the male connection portion of the first connector with the second connector in a fixed orientation with respect to the second connector to form the mating engagement. The first connector has a flattened profile.
