Transcript Slide 1

The Cardiac cycle and the
ECG
David Taylor
[email protected]
Outcomes
• Understand the pressure changes that
occur in the heart
• Describe the electrical basis of the ECG
• Explain why the heart sounds occur when
they do
• Predict the effect on the ECG of left
ventricular infarct.
Case
• Mr Gibson is taken straight into the
emergency room in the local casualty
department, given oxygen, pain relief, and
attached to a cardiac monitor. Mrs Gibson
is very concerned about her husband. Dr
Smith from the coronary care unit (CCU)
tells her that the most likely cause is a
heart attack.
I used these books
Cardiac Cycle
ECG and excitation
Understanding the Q-wave
Case.....
• The pathologist’s report shows “occlusion
of the left coronary artery with a full
thickness infarct of the left ventricular
wall”.
Understanding the Q-wave
Pressures in the heart
ECG, pressures
and sounds
Outcomes
• Understand the pressure changes that
occur in the heart
• Describe the electrical basis of the ECG
• Explain why the heart sounds occur when
they do
• Predict the effect on the ECG of left
ventricular infarct.
Cardiac Cycle