In step 2 of an electrophilic addition, the positively charged intermediate combines with (Y) that is electron-rich and usually an anion to form the second covalent bond.Step 2 is the same nucleophilic attack process found in an SN1 reaction.n step 2 of an electrophilic addition, the positively charged intermediate combines with (Y) that is electron-rich and usually an anion to form the second covalent bond.
A. The Sleep Test Optimization Program is prior. authorization initiative for Polysomnography (PSG). There are two types of sleep studies â (1) Attended. Sleep Studies - performed in an outside facility, office, sleep clinic or laboratory; and (2) Unattended.
There are four types of sleep studies performed at the Sleep Center: 1. Polysomnogram (PSG) â requires a night in a sleep lab to monitor numerous aspects of sleep. The study evaluates sleep stages, leg movements and provides a comprehensive evaluation of. apnea. It also assists in the diagnosis of other disorders that may present with excessive.