RCES ECG EXAM 2025
Small box - CORRECT ANSWERS0.04 sec
Normal PR interval in sec - CORRECT ANSWERS.12-2.0 sec (3-5 boxes)
Normal QRS duration - CORRECT ANSWERS0.04-0.10
Voltage (vertical) Small box - CORRECT ANSWERS0.1mV
Small box in msec - CORRECT ANSWERS40msec/box
Rate calculation - CORRECT ANSWERS60,000/RR interval
Cycle length = 860 ms What is HR? - CORRECT ANSWERS60,000/860 = 70bpm
Heart rate = 250bpm What is CL? - CORRECT ANSWERS240msec
CL = 620ms What is HR? - CORRECT ANSWERS97bpm
Bazett's formula - CORRECT ANSWERSQT/square root of RR interval in seconds
QTC - CORRECT ANSWERSQT interval adjusted for heart rate
Normal PR interval in msec - CORRECT ANSWERS<200msec
Normal QRS duration in msec - CORRECT ANSWERS<120msec
Normal QTC - CORRECT ANSWERS<450msec
Holter monitor - CORRECT ANSWERSStores ECG data; battery ~48hrs
Event recorder - CORRECT ANSWERSActivated by patient when feel symptomatic;
battery ~1 month
Real-time continuous - CORRECT ANSWERSanalyzes rhythm and transmits for
analysis; battery ~1 month
Insertable loop recorder - CORRECT ANSWERSRecords internal ECG continuously <2
years; allows remote transmission of data
Angle of Louis - CORRECT ANSWERSJunction between manubrium and body of
sternum (2nd intercostal space)
, V1 placement - CORRECT ANSWERSRight sternal border; 4th intercostal space
V2 placement - CORRECT ANSWERSLeft sternal border; 4th intercostal space
V4 placement - CORRECT ANSWERS5th intercostal space; mid-clavicular line
Lead I - CORRECT ANSWERSpositive between arms; left +, upright wave
Lead II - CORRECT ANSWERSRA to LL
Lead III - CORRECT ANSWERSLA to LL
Loop recorder- number of leads - CORRECT ANSWERS1
Fuzzy baseline - CORRECT ANSWERSAC interference (60Hz)
RR interval = 1.33sec; paper speed 100mm/sec - CORRECT ANSWERS45 bpm
Transmural MI on ECG - CORRECT ANSWERSPathologic Q waves
Pathologic Q wave - CORRECT ANSWERSLarger and wider >0.04sec (1 box) or over
1/3 height of R wave
First sign of acute injury to myocardial cells - CORRECT ANSWERSST segment
elevation
Inverted T wave - CORRECT ANSWERSIshchemia
Injury - CORRECT ANSWERSST elevation
Infarction - CORRECT ANSWERSQ wave
Hyperacute ischemia - CORRECT ANSWERST wave elevation
Preexcitation - CORRECT ANSWERSSeen with accessory pathways that bypass AV
node and excite ventricle early
Acute myocardial injury - CORRECT ANSWERSST segment elevation
Myocardial ischemia - CORRECT ANSWERST wave inversion, ST segment depression
Long PR interval - CORRECT ANSWERSFirst degree heart block
Short PR interval - CORRECT ANSWERSWPW /LGL; preexcitation syndromes; SA
node impulse conducted to ventricles through accessory pathway
Small box - CORRECT ANSWERS0.04 sec
Normal PR interval in sec - CORRECT ANSWERS.12-2.0 sec (3-5 boxes)
Normal QRS duration - CORRECT ANSWERS0.04-0.10
Voltage (vertical) Small box - CORRECT ANSWERS0.1mV
Small box in msec - CORRECT ANSWERS40msec/box
Rate calculation - CORRECT ANSWERS60,000/RR interval
Cycle length = 860 ms What is HR? - CORRECT ANSWERS60,000/860 = 70bpm
Heart rate = 250bpm What is CL? - CORRECT ANSWERS240msec
CL = 620ms What is HR? - CORRECT ANSWERS97bpm
Bazett's formula - CORRECT ANSWERSQT/square root of RR interval in seconds
QTC - CORRECT ANSWERSQT interval adjusted for heart rate
Normal PR interval in msec - CORRECT ANSWERS<200msec
Normal QRS duration in msec - CORRECT ANSWERS<120msec
Normal QTC - CORRECT ANSWERS<450msec
Holter monitor - CORRECT ANSWERSStores ECG data; battery ~48hrs
Event recorder - CORRECT ANSWERSActivated by patient when feel symptomatic;
battery ~1 month
Real-time continuous - CORRECT ANSWERSanalyzes rhythm and transmits for
analysis; battery ~1 month
Insertable loop recorder - CORRECT ANSWERSRecords internal ECG continuously <2
years; allows remote transmission of data
Angle of Louis - CORRECT ANSWERSJunction between manubrium and body of
sternum (2nd intercostal space)
, V1 placement - CORRECT ANSWERSRight sternal border; 4th intercostal space
V2 placement - CORRECT ANSWERSLeft sternal border; 4th intercostal space
V4 placement - CORRECT ANSWERS5th intercostal space; mid-clavicular line
Lead I - CORRECT ANSWERSpositive between arms; left +, upright wave
Lead II - CORRECT ANSWERSRA to LL
Lead III - CORRECT ANSWERSLA to LL
Loop recorder- number of leads - CORRECT ANSWERS1
Fuzzy baseline - CORRECT ANSWERSAC interference (60Hz)
RR interval = 1.33sec; paper speed 100mm/sec - CORRECT ANSWERS45 bpm
Transmural MI on ECG - CORRECT ANSWERSPathologic Q waves
Pathologic Q wave - CORRECT ANSWERSLarger and wider >0.04sec (1 box) or over
1/3 height of R wave
First sign of acute injury to myocardial cells - CORRECT ANSWERSST segment
elevation
Inverted T wave - CORRECT ANSWERSIshchemia
Injury - CORRECT ANSWERSST elevation
Infarction - CORRECT ANSWERSQ wave
Hyperacute ischemia - CORRECT ANSWERST wave elevation
Preexcitation - CORRECT ANSWERSSeen with accessory pathways that bypass AV
node and excite ventricle early
Acute myocardial injury - CORRECT ANSWERSST segment elevation
Myocardial ischemia - CORRECT ANSWERST wave inversion, ST segment depression
Long PR interval - CORRECT ANSWERSFirst degree heart block
Short PR interval - CORRECT ANSWERSWPW /LGL; preexcitation syndromes; SA
node impulse conducted to ventricles through accessory pathway
