Relate the surface ECG to the events of the cardiac cycle (60% of mark).
Describe how the PR, QRS and QT intervals may be prolonged by the action of drugs.
The first part of the question is best answered by a labelled and annotated diagram of the
ECG with the pressure events of the cardiac cycle. Common errors included mistiming of the
ECG with the pressure waveform. The second part of the question could be answered in a
tabular format such as:
Increases refractory period
Quinidine like effect,
Power and Kam 2nd edition p129 – 131
Stoelting and Hillier 4th edition p403, 409, 415