In the mist inferior aspect of the septum width averaged 1.2 mm thick in children and 1.8 mm thick in adults.

Mean thickness

Overall mean by Transesophageal US

anterior region 2.56?±?0.92?mm

fossa ovalis   1.89?±?0.75?mm

posterior region 2.95?±?0.97?mm

ATRIAL SEPTUM -MEMBARANOUS (SEPTUM PRIMUM) and MUSCULAR PORTIONS
68 M LAE preablation LAE
Ashley Davidoff MD

 

INTERATRIAL SEPTUM ON MRI
4 chamber of the heart on MRI shows a normal interatrial septum. Three measurements range between 3 to 3.7 mm. The middle portion is the region of the septum primum.
Ashley Davidoff MD
130607L
CARDIAC AMYLOIDOSIS
66-year-old male presents with dyspnea
Non gated axial CT through the mitral valve suggests left ventricular hypertrophy. The interatrial septum measures 1.8 mms which in this region is upper limits normal (1.8mms)
Ashley Davidoff MD

Links and References

 

Qadir et al  Measurement of interatrial septal thickness by echocardiography in patients with moderate to severe rheumatic mitral stenosis undergoing percutaneous balloon mitral valvuloplasty Int J Cardiol Heart Vasc. 2018;22:35?38. Published 2018 Dec 9.

Sweeney et al The normal anatomy of the atrial septum in the human heart   1979 Aug;98(2):194-9.