| ETC | electron transport chain; esophageal tracheal combitude; estimated time of conception |
|---|---|
| ETc | corrected ejection time |
| ETCO2 | end-tidal carbon dioxide [concentration] |
| F1, | F2 etc. first, second, etc., filial generation |
|---|---|
| FI, FII, | etc. factors I, II, etc. |
| ECG | Electro-Cardio-Graphy(-Gram); 심전도 = EKG 1. Conducting System Structu... |
| R1, R2, R3, etc. | years of resident study |