| escape interval | The time between the last beat of the patient's basic rhythm (ectopic or sinus beat) and a beat from a spontaneous escape focus or the initial electronic pacemaker impulse (a preset interval in the circuitry); it may be either a shorter or a longer time period than the pulse interval. (05 Mar 2000) |
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| focal interval | The distance between the anterior and posterior focal points of the eye. (05 Mar 2000) |