Cardiac cycle Flashcards

1
Q

Cardiac Cycle: Atrial Systole

A

the contraction of the R and L atria pushing blood into the ventricles

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2
Q

Cardiac Cycle: Atrial Diastole

A

the period between atrial contractions when atria are repolarizing

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3
Q

Cardiac Cycle: Ventricular Systole

A

contraction of the R and L ventricles pushing blood into the pulmonary arteries and aorta

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4
Q

Cardiac Cycle: Ventricular Diastole

A

the period between ventricular contractions when the ventricles are repolarizing

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5
Q

Cardiac Cycle: Preload

A

refers to the tension in the ventricular wall at the end of diastole. reflects the venous filling pressure that fills the left ventricle during diastole

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6
Q

Cardiac Cycle: Afterload

A

refers to the forces that impede the flood of blood out of the heart, primarily the pressure in peripheral vasculature, the compliance of the aorta and the mass and viscosity of blood.

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7
Q

Cardiac Cycle: Stroke Volume (SV)

A

refers to volume of blood ejected by each contraction of the L ventricle. Normal SV ranges from 60-80 ml depending on age, sex, and activity

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8
Q

Cardiac Cycle: Cardiac Output (CO)

A

the amount of blood pumped from the L or R ventricle per minute. CO = SV x HR. Normal CO for adult male at rest is 4.5-5.0 L/min can increase up to 25 L/min during exercise

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9
Q

Cardiac Cycle: P wave

A

atrial depolarization

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10
Q

Cardiac Cycle: PR interval

A

time for atrial depolarization and conduction from SA node to AV node (.12-.20 sec)

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11
Q

Cardiac Cycle: QRS Complex

A

Ventricular depolarization and atrial repolarization. (0.06-0.10 sec)

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12
Q

Cardiac Cycle: QT Interval

A

time for both ventricular depolarization and repolarization. (0.20-0.40 sec)

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13
Q

Cardiac Cycle: ST segment

A

Isoelectric period following QRS when ventricles are depolarized

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14
Q

Cardiac Cycle: T wave

A

ventricular depolarization

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