HOAG ECG STUDY GUIDE UPDATED QUESTIONS AND
ANSWERS GRADED A+
✔✔Sinus Arrest - ✔✔- SA node doesn't fire
- notice absence of P-wave for a complete cycle (a missed cycle)
✔✔QT Monitoring - ✔✔defaulted on "ON"; normal QT interval is 0.36-0.44; high limit is
500ms; QT and HR is inverse
✔✔QT - ✔✔Uncorrected QT
✔✔QTc - ✔✔QT corrected for heart rate
✔✔QTc HR - ✔✔HR used to calculate QTc
✔✔dQTc - ✔✔Delta QTC or the change in QTc from baseline
✔✔CANNOT ANALYZE QT - ✔✔Monitor will say this if QT morphology is too varied to
get an accurate measurement
✔✔When to discontinue QT monitoring - ✔✔1. Very flat T-wave;
2. Atrial flutter or Afib (T wave not well-defined);
3. U-waves obscuring end of T-wave
4. Tachycardia where P-wave encroaches on end of previous T-wave
5. Noise or high QRS morphology
6. Physician order
✔✔Elevated ST segment - ✔✔caused by myocardial injury or infarction, LFH, LBBB;
large S waves and upright T waves
✔✔Depressed ST segment - ✔✔J point is displaced below baseline; hypokalemia,
cardia ischemia, and medications
✔✔Normal Ventricular Pacing - ✔✔Ventricular pacing spikes precede each QRS
complex; no atrial spikes
✔✔Normal Atrial Pacing - ✔✔single pacemaker stimulus followed by a P wave
✔✔Normal AV pacing - ✔✔90 bpm
✔✔Transcutaneous pacing - ✔✔initial pacing method of choice in emergent situation
because of the speed with which it can be applied.
ANSWERS GRADED A+
✔✔Sinus Arrest - ✔✔- SA node doesn't fire
- notice absence of P-wave for a complete cycle (a missed cycle)
✔✔QT Monitoring - ✔✔defaulted on "ON"; normal QT interval is 0.36-0.44; high limit is
500ms; QT and HR is inverse
✔✔QT - ✔✔Uncorrected QT
✔✔QTc - ✔✔QT corrected for heart rate
✔✔QTc HR - ✔✔HR used to calculate QTc
✔✔dQTc - ✔✔Delta QTC or the change in QTc from baseline
✔✔CANNOT ANALYZE QT - ✔✔Monitor will say this if QT morphology is too varied to
get an accurate measurement
✔✔When to discontinue QT monitoring - ✔✔1. Very flat T-wave;
2. Atrial flutter or Afib (T wave not well-defined);
3. U-waves obscuring end of T-wave
4. Tachycardia where P-wave encroaches on end of previous T-wave
5. Noise or high QRS morphology
6. Physician order
✔✔Elevated ST segment - ✔✔caused by myocardial injury or infarction, LFH, LBBB;
large S waves and upright T waves
✔✔Depressed ST segment - ✔✔J point is displaced below baseline; hypokalemia,
cardia ischemia, and medications
✔✔Normal Ventricular Pacing - ✔✔Ventricular pacing spikes precede each QRS
complex; no atrial spikes
✔✔Normal Atrial Pacing - ✔✔single pacemaker stimulus followed by a P wave
✔✔Normal AV pacing - ✔✔90 bpm
✔✔Transcutaneous pacing - ✔✔initial pacing method of choice in emergent situation
because of the speed with which it can be applied.
