Heart Stroke Volume

Heart Stroke Volume

Define stroke volume, describe the factors effecting cardiac output.
Answer:

Stroke volume:

Definition:

• The amount of blood pumped out by each ventricle during each beat is called stroke volume.
• Normal stroke volume is 80 ml.

“Understanding heart stroke volume through FAQs: Definition, factors, and uses explained”

Modified Fick’s Principle:

• It is used to measure cardiac output.

Cardiac output is measured in two ways:

1. Using oxygen consumption:

• Cardiac output is measured by determining the amount of oxygen consumed in thebody in a given period of time and dividing this value by the arteriovenous difference across the lungs.
• Cardiac output = O₂ Consumed ÷ Arteriovenous O₂ difference.

“Importance of studying heart stroke volume for medical students: Questions explained”

2. Using carbon dioxide:

• Cardiac output is measured by determining arteriovenous difference of carbon dioxide and the amount of carbon dioxide evolved from lungs.