Best answer: What two factors does cardiac output depend on?

Cardiac output is the amount of blood the heart pumps in 1 minute, and it is dependent on the heart rate, contractility, preload, and afterload.

What are the two factors that determine cardiac output?

Cardiac output is calculated by multiplying the heart rate and the stroke volume.

What factors affect cardiac output quizlet?

Terms in this set (41)

  • Cardiac output. volume of blood ejected by one ventricle in one min (Units: L/min)
  • Cardiac index. …
  • Sleep/standing. …
  • Heavy meal/excitement/stress. …
  • Pregnancy. …
  • Heavy exercise. …
  • Stroke Volume. …
  • Energy of contraction’s effect on stroke volume.

What determines cardiac output?

Cardiac output is the volume of blood the heart pumps per minute. Cardiac output is calculated by multiplying the stroke volume by the heart rate. Stroke volume is determined by preload, contractility, and afterload. … Cardiac output is important because it predicts oxygen delivery to cells.

What are 2 factors that influence EDV?

Stroke Volume is the difference between end diastolic volume (EDV) and end systolic volume (ESV). ESV can be affected by 4 factors; preload, afterload, contractility, and Heart rate, and EDV also depends on 3 factors; venous return, Heart rate, and compliance.

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What is the effect of a stronger heart on cardiac output?

Your heart can also increase its stroke volume by pumping more forcefully or increasing the amount of blood that fills the left ventricle before it pumps. Generally speaking, your heart beats both faster and stronger to increase cardiac output during exercise.

What are the causes of decreased cardiac output?

Conditions like myocardial infarction, hypertension, valvular heart disease, congenital heart disease, cardiomyopathy, heart failure, pulmonary disease, arrhythmias, drug effects, fluid overload, decrease fluid volume, and electrolyte imbalance are considered the common causes of decreased cardiac output.

What are the four factors that influence cardiac output?

Although most clinicians should/will be able to recite the four determinants of cardiac output – heart rate, contractility, preload, and afterload – understanding of the applicability and practical relevance of each of these four components is all too often less well ingrained.

What are signs of decreased cardiac output?

The signs and symptoms of decreased cardiac output include the abnormal presence of S3 and S4 heart sounds, hypotension, bradycardia, tachycardia, weak and diminished peripheral pulses, hypoxia, cardiac dysrhythmias, palpitations, decreased central venous pressure, decreased pulmonary artery pressure, dyspnea, fatigue, …

What would be the cardiac output of a person having 72?

Complete answer:

Thus, 72 x 50 = 3600 mL is a person’s cardiac output of 72 heartbeats per minute and 50 mL of stroke volume.

What are the three factors that affect stroke volume?

There are three variables affecting stroke volume, which include contractility, preload, and afterload. [8] The definition of contractility is the force of myocyte contraction, referred to as the heart’s inotropy.

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What are the factors that affect afterload?

Factors which affect afterload: valve resistance, vascular resistance, vascular impedance, blood viscosity, intrathoracic pressure, and the relationship of ventricular radius and volume.

Effect of blood mass and inertia on afterload

  • It increases afterload in early systole. …
  • It decreases afterload in late systole.


What is the most important factor affecting stroke volume?

Stroke volume index is determined by three factors: Preload: The filling pressure of the heart at the end of diastole. Contractility: The inherent vigor of contraction of the heart muscles during systole. Afterload: The pressure against which the heart must work to eject blood during systole.

Cardiac cycle