| 释义 |
nodus sinuatrialis echo no·dus si·nu·a·tri·a·lis ech·o , NS echoa postectopic sinus beat occurring earlier than would be expected from the preceding sinus node discharge interval; that is, the interval following a premature beat of supraventricular origin is less than the ordinary cycle length between sinus beats, whereas ordinarily the interval would be expected to exceed cycle length. |