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Inositol trisphosphate or inositol 1,4,5-trisphosphate (also commonly known as triphosphoinositol; abbreviated InsP3 or Ins3P or IP3), together with diacylglycerol (DAG), is a secondary messenger molecule used in signal transduction and lipid signaling in biological cells.
In this article, IPS refers to isolated infundibular pulmonary stenosis with an intact ventricular septum. Pathophysiology. IPS has 2 forms. In the more common type, stenosis of the proximal portion of the infundibulum is due to a fibrous or muscle band at the junction of the main cavity of the RV and the infundibulum. The band divides the cavity into 2 chambers.