- Broad complex tachycardia
- Irregular rhythm, rate 130–200/min
- No clear P waves but irregular baseline, best seen in lead VL
- QRS complex duration 160 ms, with ‘M’ pattern in lead V6, indicating left bundle branch block (LBBB)
The marked irregularity of rhythm, coupled with the irregular baseline glimpsed in one beat in lead VL, shows that this is atrial fibrillation with LBBB.
What to do ?
Aortic valve disease is commonly associated with LBBB. An echocardiogram is needed, to ensure that there is no significant aortic stenosis – in which case vasodilators must be used with extreme caution.
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