Crossword Puzzle Conduction Delays and AV BlockOnline version Crossword for ECG Lesson 9: Conduction Delays and AV Blocks. by Dan Comins 1 Another name for Third degree block 2 Only abnormality is a prolonged PR interval 3 Atropine works only on the _______________fibers 4 The primary treatment for 2nd degree Block Type II and 3rd Degree Block is _________ 5 In 2nd degree Block Type I, the PR interval _________________ 6 In 2nd degree Block Type II, the PR interval is ___________ 7 _________beating is a characteristic of 2nd Degree Block Type I 8 In Third degree Block the R-R and the P-P intervals are ______________ 9 In 3rd degree Block some P waves may be __________ 10 A regular rhythm with a P wave for each QRS and a wide QRS (abbr) 3 5 2 4 6 9 7 1 8 10