Final answer:
Immediately resume CPR at a 30:2 compression-to-ventilation ratio, performing chest compressions at least 5 cm deep at a rate of 100 per minute, after an AED delivers a shock.
Step-by-step explanation:
After the AED advises and delivers a shock for a shockable rhythm, you and your partner should immediately resume CPR, adhering to the current guidelines which recommend a compression-to-ventilation ratio of 30:2 for adults. The technique for compressions involves pressing the flat part of one hand on the sternum, in between the line at T4 and T9 of the thorax, and compressing the chest at least 5 cm deep at a rate of about 100 compressions per minute. This rhythm aligns with the beat of the song "Staying Alive" by the Bee Gees. High-quality chest compressions are emphasized over artificial respiration at this stage.