ECG Yr1 Revision Flashcards
Answer: Anterior-septal wall MI
- Occlusion of the left coronary artery—left anterior descending branch
- ECG changes: pathological Q waves; absence of normal R waves in leads V1 and V2
Answer: Inferior MI
- Occlusion of the right coronary artery—posterior descending branch
- ECG changes: ST segment elevation in leads II, III, and aVF
Answer: Left axis deviation
Answer: V5-6, I and aVL
The circumflex artery supplies the posterior and lateral walls of the left ventricle and thus ECG changes manifest in V5-6, I and aVL.
Answer: 50bpm
Answer: Lateral wall MI
- Occlusion of the left coronary artery—circumflex branch
- ECG changes: ST segment elevation in leads I, aVL, V5 , and V6
Answer: V1-V4
Answer: Sinus rhythm
Answer: 150bpm
Answer: QRS complex: Phase 0 of the ventricular action potential
Answer: Lateral
Answer: <0.12s
Answer: 180ms
Answer: It will increase the amplitude of the QRS complex
Answer: ST segment
Calcium is entering the cell during the plateau phase - > ST segment
Answer: Irregularly irregular
Answer: 0.12-0.20s
Answer: Anterior MI
- Occlusion of the left coronary artery—left anterior descending branch
- ECG changes: ST segment elevation with tall T waves and taller-than-normal R waves in leads V3 and V4
Answer: II, III and aVF
Answer: Anterior wall MI
Answer: Inferior
Answer: Extreme right axis deviation
Extreme right axis deviation is indicative of the heart depolarizing in retrograde fashion. This implies that the electrical impulse originated within the ventricular myocardium and travels upwards and deoplarizes the atria after the ventricles.
Answer: 350-450ms
Remember the QT interval is inversely proportional to heart rate, therefore as the rate increases, the QT shortens.
Answer: U wave
Answer: 0.2 seconds and 0.5mv amplitude
This is of course assuming the paper speed is 25mm/sec & the gain (or amplitude setting) is 10mm/mV.
Answer: 0.08-0.12s
Answer: Normal
Answer: 85bpm
Answer: Right axis deviation
Answer: 100 beats/min
Answer: positive
Answer: 5th intercostal space
Answer: Conduction through the AV node
Answer: isoelectric
Answer: Right axis deviation
Answer: 0.6-1.0 seconds
Answer: left arm, right arm, left leg
Answer: SA node - AV node - Bundle of His - Left and right bundle branches - Purkinje fibres
Answer: Atrial depolarisation
Answer: 0.04 seconds
Answer: Left axis deviation
Answer: between -30° and +90°
Answer: Ventricular depolarisation
Answer: 300
Answer: Normal axis
Which is the correct Einthoven’s triangle?
A
Answer: Time between heart beats
Answer: 0.12-0.20 seconds
Answer: Ventricular repolarisation
Answer: 300 / number of large squares in between each consecutive R wave
Answer: 0.2 seconds
Answer: 5
Answer: Ventricular depolarisation and repolarisation
Answer: +30 degrees
Answer: 80ms
Answer: Inferior
Answer: Acute anterolateral MI
Answer: aVF
Answer: Septal
Answer: Anterior
Answer: 0.08 sec
Answer: Right axis
Answer: V6
Choose the ECG that matches the following criteria:
- Rate: Ventricular 150bpm, atrial 280bpm
- Rhythm: Regular
- P waves: Flutter waves
- PR Interval: Variable
- QRS: 0.08 seconds
Answer: Option C
Answer: Normal
Answer: ECG leads are not correctly placed.
Answer: Normal axis
Answer: Lateral
Answer: Left anterior descending coronary artery
Answer: A P-wave precedes each QRS-complex
Answer: 100bpm
Answer: +90 degrees
Answer: 490ms
The QT interval is defined from the beginning of the QRS complex to the end of the T wave. The QT interval should be measured in either lead II or V5-6
Answer: -30 degrees to +90 degrees
Answer: Leads II, III and aVF
Answer: Right axis
Answer: Acute inferior MI
Answer: 220ms
5.5 small squares * 40 ms = 220ms
Answer: 340ms
Answer: Acute anteroseptal MI
