Figure 1

In the left anterior oblique (LAO) projection, the tricuspid annulus was viewed as a clock face, that was divided into 6 portions: anteroseptum (approximately 12 o’clock to 2 o’clock), midseptum (approximately 2 o’clock to 4 o’clock), posteroseptum (approximately 4 o’clock to 6 o’clock position), anterolateral portion (approximately 10 o’clock to 12 o’clock position), midlateral portion (approximately 8 o’clock to 10 o’clock position), posterolateral portion (approximately 6 o’clock to 8 o’clock position).