Table 2.

Intracardiac echocardiographic measurements of anatomic features of the interatrial septum (measurements are referred to the 4-chamber view)

Anatomical characteristics	Mean (millimetres)
Diameter of the interatrial septum	36 ±10.6
Length of anterosuperior rim (aortic rim)	5.4 ±1.2
Oval fossa diameter	24 ±6.9
Patent oval foramen tunnel length	13 ±3.9
Patent oval foramen size	5.9 ±0.4
Rim thickness	9.8 ±8.6
Association of anatomical characteristics	Number of pts (%)
Long channel alone	15/80(18.7%)
Large ISA (> 4 RL) alone	25/80(31.2%)
Moderate ISA (>2 RL but <4 RL) alone	17/80(21.2%)
Hypertrophic rims alone	6/80(7.5%)
Long channel + moderate ISA	10/80(12.5%)
Long channel + hypertrophic rims	7/80(8.7%)