IBHRE - CH. 7 ECG & Lead Mapping
Exam Actual Questions With 100%
Verified Answers
What is 1 small box on the ECG paper? -
correct answer ✅0.04 sec. or 40ms
What is 1 large box (5 small boxes) on the ECG paper? -
correct answer ✅0.2 sec or 200ms
What is the voltage of 1 small box on ECG paper -
correct answer ✅0.1 mV (and 1 mV = 1 cm)
On a standard ECG an R wave that is 1cm high and 4 boxes wide
measures out to be -
correct answer ✅1.0 mV by 0.16 sec (160ms)
When does ST elevation occur? -
correct answer ✅ST elevation is associated with acute injury
and is one of the earliest stages of an MI
When is ST elevation considered significant -
correct answer ✅If the vertical distance b/w the ECG trace
and the isoelectric line at a point 0.04 secs after the j-point is at
least 0.1mV in a limb lead or 0.2 mV in a precordial lead
,IBHRE - CH. 7 ECG & Lead Mapping
Exam Actual Questions With 100%
Verified Answers
ST segment depression -
correct answer ✅Suggests reversible ischemia
Can be determined by measuring the vertical distance between the
patients trace and isoelectric line from the PR segment. It is
significant if it is 1mm in V5/V6 or 1.5mm in AvF/III
1st degree heart block -
correct answer ✅prolonged PR interval > 0.20 seconds or
200ms
Ischemia -
correct answer ✅Lack of oxygenated blood supply to the LV
Pathologic Q waves indicate -
correct answer ✅transmural MI. They appear the first day of
an MI, they never really go away
Ischemia seen on ECG -
correct answer ✅inverted T wave & St segment depression
, IBHRE - CH. 7 ECG & Lead Mapping
Exam Actual Questions With 100%
Verified Answers
Hyperacute ischemia seen on ECG -
correct answer ✅"T" wave elevation/broadening
Infarction seen on ECG -
correct answer ✅Q waves
Myocardial injury on ECG -
correct answer ✅ST elevation
How is the standard corrected QT interval calculated (Bazett's
formula) -
correct answer ✅QT/square root of RR interval in seconds.
Normal values are <450
Hypocalcemia on ECG -
correct answer ✅Prolongs QT
Exam Actual Questions With 100%
Verified Answers
What is 1 small box on the ECG paper? -
correct answer ✅0.04 sec. or 40ms
What is 1 large box (5 small boxes) on the ECG paper? -
correct answer ✅0.2 sec or 200ms
What is the voltage of 1 small box on ECG paper -
correct answer ✅0.1 mV (and 1 mV = 1 cm)
On a standard ECG an R wave that is 1cm high and 4 boxes wide
measures out to be -
correct answer ✅1.0 mV by 0.16 sec (160ms)
When does ST elevation occur? -
correct answer ✅ST elevation is associated with acute injury
and is one of the earliest stages of an MI
When is ST elevation considered significant -
correct answer ✅If the vertical distance b/w the ECG trace
and the isoelectric line at a point 0.04 secs after the j-point is at
least 0.1mV in a limb lead or 0.2 mV in a precordial lead
,IBHRE - CH. 7 ECG & Lead Mapping
Exam Actual Questions With 100%
Verified Answers
ST segment depression -
correct answer ✅Suggests reversible ischemia
Can be determined by measuring the vertical distance between the
patients trace and isoelectric line from the PR segment. It is
significant if it is 1mm in V5/V6 or 1.5mm in AvF/III
1st degree heart block -
correct answer ✅prolonged PR interval > 0.20 seconds or
200ms
Ischemia -
correct answer ✅Lack of oxygenated blood supply to the LV
Pathologic Q waves indicate -
correct answer ✅transmural MI. They appear the first day of
an MI, they never really go away
Ischemia seen on ECG -
correct answer ✅inverted T wave & St segment depression
, IBHRE - CH. 7 ECG & Lead Mapping
Exam Actual Questions With 100%
Verified Answers
Hyperacute ischemia seen on ECG -
correct answer ✅"T" wave elevation/broadening
Infarction seen on ECG -
correct answer ✅Q waves
Myocardial injury on ECG -
correct answer ✅ST elevation
How is the standard corrected QT interval calculated (Bazett's
formula) -
correct answer ✅QT/square root of RR interval in seconds.
Normal values are <450
Hypocalcemia on ECG -
correct answer ✅Prolongs QT
