An ECG monitoring method and apparatus are presented in which contact impedances including capacitive components are utilized to, for example, reduce false alarms for lead-off conditions. In one aspect of the disclosure a method includes monitoring a plurality of Electrocardiogram (“ECG”) electrodes ostensibly electrically connected to a human body; determining the respective contact impedance for each of the ECG electrodes as a plurality of electrical currents is driven through the ECG electrodes in a predetermined pattern, each respective contact impedance including a resistive component and a capacitive component; ascertaining whether any of the determined respective contact impedances exceeds a predetermined threshold; if any of the determined respective contact impedances exceeds the predetermined threshold, issuing an alarm.