A History of Short Words

From the New York Times Crossword Puzzle

ECG

Thu, 1 Jan '26
Heart chart, for short
Sat, 13 Dec '25
Ticker tape?: Abbr.
Thu, 23 May '24
Heart test inits.
Sun, 28 Jan '24
Medical procedure, for short
Thu, 12 Aug '21
Heart chart, for short
Wed, 24 Feb '21
Heartbeat recording: Abbr.