(1) increased tonus of the muscles about the eye(2) Upper airway patency during sleep is determined, in part, by the tonus of pharyngeal dilator muscles.(3) Muscle tonus, measured by the EMG, is also often recorded since muscle tonus decreases within sleep.(4) Since then, I have always remembered the side effects of fentanyl, particularly the increase in sphincter tonus , and all my junior colleagues hear a u2018short lectureu2019 from me on the subject.(5) They also reported a decrease in uterine tonus and an increase in fetal movements.(6) Also, subjacent vascular smooth muscle cells increase their tonus .
