Intermediate
Technical
IVT
sinotubular junction
Pronunciation: SIGH-no-TU-bu-lar
The anatomical boundary between the sinuses of Valsalva and the tubular portion of the ascending aorta, marking the upper attachment of aortic valve cusps.
Full Definition
The sinotubular junction (STJ) is a critical anatomical landmark where the dilated sinuses of Valsalva transition to the tubular ascending aorta. This junction serves as the upper attachment point for the aortic valve cusps and plays a crucial role in valve function. Dilatation of the STJ can cause aortic regurgitation by preventing proper cusp coaptation, and restoration of normal STJ geometry is essential in valve-sparing procedures.
Usage
Usage note: Often abbreviated as STJ in clinical documentation; central to valve-sparing surgery concepts.
In Context
- "The sinotubular junction diameter of 45mm was causing significant aortic regurgitation." — Imaging report
- "Reconstruction of the sinotubular junction was necessary to restore competent valve function." — Operative note
Also known as
STJ
Don't confuse with
aortic annulus
coronary ostia