ECG Ne Flashcards
Normal rate of an ECG
25mm/s
How long do the small squares represent?
0.04 s
How long do the big squares represent?
0.2s
How do you work out the heart rate on an ECG?
300/ number of big squares between R waves
What does the P wave represent?
Atrial depolarisation
What is the normal range for the PR interval?
0.12 - 0.2 s
What does a short PR interval indicate?
Accessory pathway (Wolff-Parkinson White Syndrome)
What do prolonged PR waves indicate?
Heart block
What does the QRS wave represent?
Ventricular depolarisation
What is normal duration for the QRS wave?
0.12 s
What does a prolonged QRS wave indicate?
Bundle branch block
What does a high amplitude QRS complex indicate?
Ventricular hypertrophy
What do pathological Q waves indicate?
Few hours following MI
ST segment elevation indicates what?
Myocardial infarction
Which artery is affected when leads aVF, II and III are affected?
Right coronary artery
What artery is affected when leads aVL, leads I, V5-V6?
Left circumflex artery
Which artery is affected when the leads V1-2 and sometimes V3-V4?
Left descending artery
Which surface is monitored by V1-V2?
Septal
Which surface is monitored by V3-V4?
Anterior
Which surface is monitored by V5-V6?
Lateral
Which surface is monitored by aVL?
Lateral
Which surface is monitored by aVF?
Inferior
Which surface is monitored by I?
Lateral
Which surface is monitored by II?
Inferior
Which surface is monitored by III?
Inferior
How is Atrial Fibrillation seen on ECG?
Irregular irregular, absent P Waves
Atrial Flutter on ECG?
Sawtooth baseline, regularly irregular
Wolf-Parkinson White syndrome on ECG?
Delta waves, decreased PR intervals
Heart block on ECG?
Increased PR interval
L/R BBB on ECG?
Prolonged QRS complex
Supra ventricular tachycardia on ECG?
Narrow QRS complex
Ventricular hypertrophy on ECG?
High amplitude QRS
How is NSTEMI seen on ECG?
St depression
