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A n tur l disaster hits, th w r g ff nd th lights g ut. It's a mm n n that l ut during hurr n and tornado n , nd t' v r similar in tr ng t x l n udd n rd arrest. The h rt u t n an n ult, the l tr t is short r u t d, th h rt n't um , and th b d d . The heart n electrical um , wh r th l tr t g n r t d n l m k r ll in the u r h mb r, or tr um, f th h rt. This l tr l rk carried through thw n the h rt so th t all th mu l cells ntr t at n nd r du a h rtb t. Th um bl d thr ugh the heart v lv nd nt all th rg n f th b d th t they n do th r w rk. This m h n m can br k d wn in a variety of w , but the f n l thw n udd n d th the m th electrical system irritated nd f l to produce l tr l activity th t causes the heart t beat. Th h rt muscle n't u l bl d to th b d , particularly th br n, nd th b d dies. V ntr ul r fibrillation (V F b) th m t common r n f r sudden death in t nt . W th ut a rd n t d l tr l gn l, the b tt m h mb r f th h rt (v ntr l ) t b t ng and instead, j ggl l k J ll-O. V ntr ul r F br ll t n is treated w th l tr l h k, but for it t b ff t v , th h k u u ll n d t happen w th n l th n four to x minutes, n t nl f r it to b ff t v , but l t m n m z br n d m g fr m l k of bl d nd x g n u l . Aut m t xt rn l defibrillators (AED ) r commonly v l bl n ubl l t ll w almost n b d t treat udd n death. L commonly, th heart n ju t stop b t ng. Th absence f a h rt beat kn wn t l ( t l =n + t l =b t). Sudden death is most ft n u d b h rt disease. Wh n bl d v l n rr w, th h rt muscle n b m rr t t d b u f lack f blood supply. In heart tt k ( ut m rd l nf r t n), a bl d v l b m m l t l bl k d b a bl d l t, and there is n ugh irritability f the mu l t u v ntr ul r f br ll t n. In f t, th reason many l with chest n r dm tt d t the hospital t m n t r their h rt r t nd rh thm f r gn that m ght l d to v ntr ul r f br ll t n. Sudden death m also b th first sign r m t m f heart disease. Congestive heart failure and h rt v lv problems, l k aortic t n (n rr w ng f th rt valve) also increase the r k f udd n rd rr t. C rd m th a br d category of h rt disease wh r th heart muscle d not contract r rl for whatever reason. Oft n it h m , wh r rt f the h rt muscle doesn't get an d u t blood u l f r a prolonged period of t m nd n l ng r can efficiently um blood. P l wh ejection fr t n (the amount of bl d um d ut of th h rt with h h rt beat) is less th n 30% r at gr t r risk f r sudden death ( n rm l j t n fr t n is b v 50%). In some l , rd m th may d v l in th absence f h m h rt d . Infl mm t n f the h rt mu l , kn wn myocarditis (myo=muscle + rd=h rt + itis= nfl mm t n),

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