The Cardiac Cycle Flashcards

1
Q

Describe the five stages of the cardiac cycle

A
  • Late diastole
  • Atrial Systole
  • Isovolumetric ventricular contration
  • Ventricular ejection
  • Isovolumetric ventricular relaxation
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2
Q

What happens during late systole?

A

Both sets of chambers are relaxed and ventricles fill passively

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3
Q

Whats happens during atrial systole?

A

Atrial contraction forces a small amount of blood into the ventricles

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4
Q

Whats happens during isovolumetric ventricular contraction?

A

Contraction - first phase of ventricular contraction pushes AV valves closed but does not create enough pressure to open semi-lunar valves

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5
Q

Whats happens during ventricular ejection?

A

As ventricular pressure increases and exceeds pressure in the arteries, the semi-lunar valves open and blood is ejected

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6
Q

Whats happens during isovolumetric relaxation?

A

As ventricles relax, pressure in ventricles decreases, blood flows back into the cusps of the semi-lunar valves and snaps them closed

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7
Q

Stenosis of the aortic/pulmonary valves would create a murmur at what point in a normal heart phonocardiogram?

A

In-between S1 (mitral and tricuspid closure) and S2 (aortic and pulmonary closure)

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8
Q

What other pathology would create a similar sound to aortic/pulmonary stenosis?

A

Mitral/tricuspid regurgitation

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9
Q

Stenosis of the mitral and tricuspid valves would cause a murmur at what point in an otherwise normal phonocardiogram?

A

After S2 (aortic and pulmonary closure)

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10
Q

What other pathology would create a similar sound to mitral/tricuspid stenosis?

A

Regurgitation through aortic and pulmonary valves

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11
Q

What pathology would create a constant whooshing sound?

A

Septal defect

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