1. What is sinus tachycardia?: Answer 1) Rate >100 bpm 2) QRS Narrow 3) QT intervals shorter tx: beta blockers and calcium channel blockers to slow down heart rate 2. What is normal time for P-wave?: Answer 0.06-0.12 seconds - atrial depolarization 3. What is normal time PR interval?: Answer 0.12-0.20 seconds Atrial delay to allow ventricles to fill up 4. What is normal time for QRS interval?: Answer 0.04- 0.12 seconds Ventricular depolarization 5. What is normal time for ST segment?: Answer not measured 1) elevated= myocardial injury 2) Depression= injury or ischemia 6. What is a normal forT wave?: Answer 0.1/0.5 mv a) inverted= myocardial ischemia b) peaked/tented= MI/ hyperkalemia