The cost-effectiveness of providing an automated
external defibrillator (AED) at sites of
aquatic activity has been debated. The predominant
cardiac-arrest rhythm in drowning is asystole.39
Of course, cardiac arrests at aquatic sites
occur from causes other than drowning, and the
availability of an AED may be lifesaving.39 Table 1
summarizes the recommendations on when to
begin CPR and how long it should be maintained
in cases of drowning.