The expression is a trinomial, like the expressions which we've been factoring in this lesson. There is a small variation in this problem however -- the first term has a coefficient that is not 1.
Ventricular Phonation (Plica Ventricularis). This occurs when a great amount of muscle tension above the vocal folds is created in the laryngeal area causing an approximation of the false vocal folds.entricular Phonation (Plica Ventricularis). This occurs when a great amount of muscle tension above the vocal folds is created in the laryngeal area causing an approximation of the false vocal folds.
To relieve this pressure, the surgeon makes a fenestration (hole) between the tunnel and the heart. The fenestration allows some blood to flow from the tunnel into the heart. It acts as a temporary pressure release valve while your child's body is adjusting to the new circulation.It is usually closed several months after the Fontan operation, so that oxygen-poor and oxygen-rich blood no longer mix.enestration closure after a Fontan operation is a procedure to close the hole between your child's heart and the tunnel that takes oxygen-poor blood from the body to the lungs. 1  The procedure is done in the heart catheterization lab.