Ecg Segment Abnormalities Flashcards
What causes tall p waves
Right atrial hypertrophy
What ecg change is seen in left atrial hypertrophy
Broad p wave
What are some causes of broad qrs
Bbb or ventricular pacing
What causes tall qrs
Ventricular hypertrophy
What would cause tall qrs in v5 and v6
Lvh
What is meant by a “conduction window” in regards to q waves
If MI is transmural, septal conduction is exaggerated on the ecg, showing deep and wide q waves
What can cause wide spread st elevation
Pericarditis
What can cause t wave inversion
Ischaemia, bbb, ventricular hypertrophy or digoxin
What ecg changes can digoxin cause?
Down sloping st depression with twi
What ecg change will high or low potassium cause?
High k+ peaked t waves
Low k+ flattened t waves
What picture would pulmonary embolism show on ecg
Right ventricular hypertrophy
What are ecg signs of a PE
Peaked P wave R axis deviation Tall R waves in v1 Rbbb Twi in v3 or v2 Shift in R/S transition point towards left heart Q wave in III
What causes the ecg pattern seen in fibrilation?
Individual muscle fibres conducting asynchronously
What causes re-entry tachycardia?
Existence of accessory fibre from left atrium to ventricle, conduction going from bundle of His back up to atria thru accessory pathway
What does re-entry tachycardia look like on ecg
tachy with no p waves
