Narcissists believe their personality and appearance is superior to others. Symptoms of narcissism include focusing only on one's self, lacking guilt and an inability to empathize. Narcissistic people tend to be vain. A marriage being undermined by narcissism might benefit from therapy.
Trocar: A sharply pointed shaft, usually with a three-sided point. A trocar may be used within a cannula, a hollow tube, designed to be inserted into a vein, artery, bone marrow or body cavity. The word trocar is derived from the French trois (three) + carre (side). Last Editorial Review: 6/9/2016.
In laparoscopic Heller myotomy, a small incision is made just above the umbilicus. A trocar (hollow tube) is inserted, and the abdomen is filled with carbon dioxide gas to allow visualization of the abdominal organs. A scope with a light and camera is inserted into this trocar and the image is shown on TV monitors.