NSR (Normal Sinus Rhythm) {Ans: }failure to capture {Ans: like if you have a camera that doesnt capture/produce the product/picture!}SVT {Ans: no visible P wave, if symptomatic synchronized cardioversion, vagal maneuver, adenosine}2nd degree AV block T1 {Ans: inconsistent PR interval, R-R inconsistent INCONSISTENCY}Sinus tachycardia {Ans: >100-<160, TX: identify and tx underlying cause}P-R interval {Ans: #4}