Flashcards in Cardiac Cycle Deck (19)
The Cardiac cycle on an EKG is what?
P wave, QRS wave, T wave
What do P, QRS, and T stand for?
P wave is atrial depolarization, QRS is ventricular depolarization, T is ventricular repolarization
Are valves open or closed during isovolumetric contraction and isovolumetric relaxation?
All are closed
First heart sound is what?
S1, This occurs when the mitral valve closes after Atrial systole. It is not the sound of the valve closing, its actually the sound of blood oscillating through the ventricle. Low pitch, longer, more intense
Second heart sound?
S2. This occurs when the aortic and pulmonic veins close and is the oscillation of blood in the pulmonary artery and the aorta.
Third Heart SOund
Vibration of blood during ventricular filling. Occurs in early diastole. Only loud during heart failure.
Fourth Heart Sound
Occurs during atrial contraction and is low in pitch and intensity
Know the graphs on page 3
Know the Pressurve Volume graph
When do Preload and afterload occur
Pre load occurs when the mitral valve closes after the ventricles have been filled.
Afterload refers to the point at which the aortic valve opens after the ventricles have been contracted. Its just immediately prior to ejection
Systolic pressure is what?
Peak pressure in the aorta
Diastolic pressure is what>
Minimum pressure in the aorta
Increased pre-load does what to stroke volume?
Increased afterload does what to stroke volume?
Increaseing the contractility does what to stroke volume>
One way to compensate for increased afterload is to>
Describe how AV valves work?
If the atrial pressure is greater than ventricular pressure then the valves are open. If the ventricular pressure is greater than atrial pressure then the valves are closed.