Silence.
Most ECG books taught pattern recognition. Memorize the criteria for left bundle branch block. Recite the stages of hyperkalemia. Name each wave, each interval, each segment like a catechism. But Dr. Brennan had understood something that textbooks missed: the heart was not a collection of checkboxes. It was a story. And every good story had a shape. Shamrock Ecg Book
“Third leaf. The intervals.”
The shamrock had saved him.