(1) To close an ion channel by electrical (e.g., membrane potential) or chemical (e.g., neurotransmitter) action. (2) Action of a special nerve fiber to block the transmission of impulses through a synapse, e.g., gating of pain impulses at synapses in the dorsal horns. (3) A device that can be switched electronically to control the passage of a signal. (4) To use a physiologic signal, such as an ECG, to trigger an event such as an x-ray exposure or to partition continuously collected data.gated radionuclide angiocardiographycardiac gating. [O.E. geat]
