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Answers on p 433.
A 64 year old woman with a history of hypertension was admitted to our clinic because of recent onset dyspnoea and dizziness. A 12 lead surface electrocardiogram (ECG) showed complete atrioventricular block with an escape rate of 35 beats/min. A transvenous temporary pacemaker lead was immediately inserted through the right femoral vein. Capture threshold was within the acceptable range. During post-procedure observation in the coronary care unit it was realised that the temporary pacemaker was intermittently capturing. A 12 lead ECG was obtained and is shown in fig 1; the fluoroscopic view is shown in fig 2.
Describe the ECG (fig 1).
What do you see in the fluoroscopic view (fig 2)?