ECG lead A<unk>  is an electrical time sequence measurement that shows no activity and therefore, when represented, shows a<unk>  instead of a moving one. It almost always refers to either a<unk> d electrocardiogram, where the heart shows no electrical activity (asystole), or to a flat electroencephalogram, in which the brain shows no electrical activity (brain death). Both of these specific cases are involved in various definitions of death.
Flatline
Bromazine
Veristrat
Vernakalant
Brompheniramine
Chlorphenamine
Seltorexant
Daridorexant