130 ECG II

Question 1

common ECG paper presentation

Answer 1

Question 2

Basic measurements to be made on ECG

Answer 2

• nHeart rate: •300, 150, 100, 75, 60, 50, which=HR for 1,2,3,4 and 5 boxes between beats
• nIntervals
  
  • nPR interval: 0.12-0.2
  • nQRS interval: 0.10
  • nQT interval and the corrected QT interval, QTc: female 0.46 males 0.45
    
    • QTc: QT/SQRT(RR interval)
• nAxis
  
  • •If net direction is up in I, axis is in the right ½ of the circle (and vice versa)
  • •If net direction is up in aVF, axis is in the lower ½ of the circle

Question 3

In a normal ECG…

Answer 3

• ·intervals, QRS and T wave axes and rate are normal
• ·P waves are upright in lead II
• ·every P wave is followed by a QRS complex.
• ·normal sinus rhythm is present
• ·the TP, PR, and ST segments are all on about the same level
• ·the P, T waves, and QRS complex all point in approximately the same direction (put another way, their axes should be about the same)
• ·from V1 to V6, there is a smooth and progressive transition from a predominantly downward to a predominantly upward QRS waveform