Apparently you are not aware that "cardiac arrest" absolutely is the same as no pulse. I do know the difference and I'm pretty sure Dr. Peterson does, too.
http://www.thefreedictionary.com/cardiac+arrest
cardiac arrest
(Medicine) failure of the pumping action of the heart, resulting in loss of consciousness and absence of pulse and breathing: a medical emergency requiring immediate resuscitative treatment
Missed the entire point. MS was without a pulse for multiple minutes then he was revived and had posturing. All this means brain damage.