A Heart Monitor's Depiction of No Heartbeat

This page is the CodyCross answer for the clue below from Welcome to Japan, Group 566, Puzzle 2 (Tanegashima Space Center).

Question is: A Heart Monitor's Depiction of No Heartbeat

and the answer is: FLATLINE

Word Meaning:

FLATLINE — (medicine, cardiology) An asystole; the absence of heart contractions or brain waves.

Definitions from Wiktionary.

A heart monitor's depiction of no heartbeat — CodyCross Answer | CodyCross Solutions