While CPR is given (either manually, or through automated equipment such as AutoPulse), members of the team consider eight forms of potentially reversible causes for cardiac arrest, commonly abbreviated as "6Hs & 5Ts" according to 2005/2010 AHA Advanced Cardiac Life Support (ACLS).[1][2][3][4] Note these reversible causes are usually taught and remembered as 4Hs and 4Ts[5]—including hypoglycaemia and acidosis with hyper/hypokalaemia and 'metabolic causes' and omitting trauma from the T's as this is redundant with hypovolaemia—this simplification aids recall during resuscitation.