Arruda algoritmus (Step by step)
LL - left lateral, LAL - left antero-lateral, LP - left posterior, LPL - left postero-lateral. MCV - Middle cardiac vein. AS - antero-septal, RAPS - right anterior para-septal, MSTA - Mid-septal tricuspid annulus, PSTA - Postero-septal tricuspid annulus, CSOs - Coronary sinus ostium, PSMA - Poster-septal mitral annulus. RA - Right anterior, RAL - Right antero-lateral, RL - Right posterior, RPL - Right postero-lateral.