valve

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  • noun

Words related to valve

a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it

device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone

the entire one-piece shell of a snail and certain other molluscs

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one of the paired hinged shells of certain molluscs and of brachiopods

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References in periodicals archive ?
The right atrium was opened to examine the CS ostium and the Thebesian valve and various measurements were taken.
1988) had also observed that the maximum diameter of the CS ostium tended to vary inversely with the extent of the Thebesian valve.
Thebesian valve is the valve at the CS orifice and Vieussens valve is present at the orifice of the great cardiac vein where it drains into the CS (10).
2] Typically, the right atrial partition is due to exaggerated fetal eustachian and thebesian valves, which together form an incomplete septum across the lower part of the atrium.
Reasons for difficult CRT implantation Coronary Venous System Related Problems: 1-Failure to access coronary venous system: --Markedly enlarged right atrium and severe TR --Tortuous, angulated, vertically positioned CS os --Prominent Thebesian valve --Prominent Vieussens valve --Small-sized CS 2-Anatomic variations in the coronary venous system: --Lack of suitable venous branch: --Early takeoff of left ventricular branches --Too large or too small veins --Sharply-angulated/tortuous venous branches --Venous branches with narrowing --Venous branches with valves Scar burden Phrenic nerve stimulation Lack of adequate capture threshold Left ventricular lead instability CRT--cardiac resynchronization therapy, CS--coronary sinus, TR--tricuspid regurgitation
These thrombi closely mimic other right heart structures such as the chiari network, persistent eustachian or thebesian valves and pathological structures such as vegetations and intracardiac tumours.