nodus sinuatrialis echo

(redirected from NS echo)

no·dus si·nu·a·tri·a·lis ech·o

, NS echo
a 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.
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