Flashcards in ECGs Deck (27)
What is the cut off heart rate for a tachycardia?
What is the cut off heart rate for a bradycardia?
How long is a narrow complex tachycardia?
Less than 120ms
How long is a broad complex tachycardia?
Greater than 120ms
Give examples of a narrow complex tachycardia
Re-entrant tachycardia (AVNRT, AVRT)
Give examples of a broad complex tachycardia
Torsades de pointes
Give examples of rhythms without a p wave
How do you recognise LAD?
Most positive QRS complex in lead aVL
How do you recognise RAD?
Most positive QRS in lead III or aVF
What does a bifid p wave mean?
= left atrial enlargement
Due to prolongation of atrial depolarisation
How long is the PR interval meant to be?
What causes a long PR interval?
How is the PR interval measured
Beginning of P to start of Q
Describe first degree heart block
PR interval longer than 5 squares (0.2s)
Describe mobitz I heart block
Gradual lengthening of PR interval, then p wave with no QRS complex
Deprive mobitz II heart block
Long PR interval with dropped QRS complexes
Describe third degree heart block
No relationship between P and QRS
State the system for descibnig ECGs
name, correct recording
How do you calculate the rate on an ECG
300/no of large squares in R-R interval
6 x no of QRS complexes
What can cause right axis deviation
right ventricular hypertrophy
What can cause left axis deviation
left anterior hemiblock
Wolff-Parkinson-White syndrome* - right-sided accessory pathway
what can cause a shortened PR interval
if the p wave originates closer to the AVN
What is R wave progression
S wave > R wave in leads V1-V3
changes to S wave < R wave in lead V4 in healthy heart
What is the ST segment
end of S to start of T
What causes tall T waves
what causes inverted T waves
bundle branch block
left ventricular hypertrophy