Author Question: What is meant by the term ejection fraction? What will be an ideal ... (Read 81 times)

kamilo84

  • Sr. Member
  • ****
  • Posts: 495
What is meant by the term ejection fraction?
 
  What will be an ideal response?

Question 2

In pacing, rate modulation refers to _____.
 
  a. the ability of a pacemaker to recognize and respond to intrinsic electrical activity
  b. the minimum level of electrical current needed to consistently depolarize the myocardium
  c. the ability of a pacemaker to increase the pacing rate in response to physical activity or metabolic demand
  d. a pacing lead with a single electrical pole at the distal tip of the pacing lead through which the stimulating pulse is delivered.



sarah_brady415

  • Sr. Member
  • ****
  • Posts: 328
Answer to Question 1

Ejection fraction is the percentage of blood pumped out of a heart chamber with each contraction. Each ventricle holds about 150 mL when it is full; they normally eject only about half this volume (70 to 80 mL) with each contraction.

Answer to Question 2

C
Rate modulation refers to a pacemaker's ability to adapt its rate to meet the body's needs caused by increased physical activity and then increase or decrease the pacing rate accordingly. A pacemaker's rate modulation capability may also be referred to as rate responsiveness or rate adaptation.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

Did you know?

Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

For a complete list of videos, visit our video library