Intraoperative two-dimensional or three-dimensional real time transoesophageal echocardiography, if the service: (a) includes Doppler techniques with colour flow mapping and recordings on digital media; and (b) is performed during cardiac surgery; and (c) incorporates sequential assessment of cardiac function before and after the surgical procedure; and (d) is not associated with a service to which item 55135, or an item in Subgroup 3, applies (R) (H) (Anaes.)