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.
A sleep study measures your sleep cycles and stages by recording: 1  Air flow in and out of your lungs as you breathe. 2  The level of oxygen in your blood. 3  Body position.  Brain waves 1  (EEG) Breathing effort and rate.  Electrical activity of 1  muscles. Eye movement.  Heart rate.