title: ECG response: February 11, 2014.
mesh_terms: D001282:Atrial Flutter / Q000175:diagnosis* / Q000503:physiopathology; D054537:Atrioventricular Block / Q000175:diagnosis* / Q000503:physiopathology; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008875:Middle Aged; D012849:Sinoatrial Node / Q000502:physiology; D013610:Tachycardia / Q000175:diagnosis* / Q000503:physiopathology