The<unk>  or<unk>  is a rare extra<unk><unk>  that occurs soon after the normal two "lub-dub"<unk><unk> s (S1 and S2).<unk>  is associated with<unk>  failure.
Third heart sound
Heart click
Graham Steell murmur
Apex beat
Pulsus alternans
Austin Flint murmur
Grand Rounds
Right axis deviation