ostium

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ostium

[′äs·tē·əm]
(biology)
A mouth, entrance, or aperture.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
However, prolonged orthostatic positions with a lack of muscle contraction in the lower limbs will lead to an alteration of the profound venous return, thus triggering an exertion in the ostial valves and the appearance of a horizontal venous reflux from the profound towards the superficial venous system.
With these results, PCI with DES will gradually increase and can be suggested as the dependable alternative to bypass surgery for patients with unprotected LMS stenosis, especially as the first line-therapy for ostial or shaft stenosis15.
During this admission, the patient underwent nonselective coronary angiography due to the previous excessively protruding stent and showed in-stent restenosis (ISR) at ostial LMCA [Figure 1]d.
Anatomy of the pulmonary veins in patients with atrial fibrillation and effects of segmental ostial ablation analyzed by computed tomography.
A diagnostic left heart catheterization performed as part of a heart transplant evaluation revealed severe ostial stenosis of the LMCA.
Renal artery stenting was done in all cases at the ostial and proximal lesion without distal protection or filtration device.
However, in some patients, we could not rule out a macroreentry in the vein or a slow conduction from the LA into a second PV fascicle may be the responsible mechanism because the second potential disappeared and never occurred again during the ostial ablation.
Porokeratotic eccrine ostial and dermal duct nevus (PEODDN) is a rare benign cutaneous disorder.
Minimal adhesions implies adhesions involving < 1/4 of uterine cavity, thin or filmy adhesions, either clear or minimal involvement of ostial areas and upper fundus.
In patients with moderate to severe aortic regurgitation, Aorta was opened and cardioplegia was given directly in coronaries by ostial cannula.
All heart specimens (100) have single ostial openings in left coronary sinus except 1 in which two openings were present, i.e., one for the main trunk of LCA and another for circumflex artery.