Author Question: What has the greatest influence on preload? A. Blood pressure B. Contractility C. Fluid ... (Read 17 times)

jon_i · **on:** Jun 28, 2018

What has the greatest influence on preload?

A.
Blood pressure
B.
Contractility
C.
Fluid volume
D.
Heart rate

Question 2

A nurse is teaching a community class on heart disease in children. Which information about prevention is most important for the nurse to share?

A.
Many conditions are genetic, and preventative gene therapy may become possible.
B.
Maintaining good control of diabetes and hypertension prevents most cases.
C.
Prevention is impossible because there are few known causes of heart disease.
D.
Taking 400 mg/day of folic acid will prevent most known cardiac diseases.

Mholman93 · **Reply #1 on:** Jun 28, 2018

Answer to Question 1

ANS: C
Preload is equivalent to venous blood return to the atria and end diastolic volumes of the heart. This is directly influenced by fluid volume. Heart rate and contractility have some influence, but they are not the major determinants of preload. Blood pressure is not a direct influence on preload.

Answer to Question 2

ANS: A
Most cases of congenital cardiac disease have no known cause. The most accurate statement is that genetic causes of heart disease may be prevented with gene therapy in the future. Controlling chronic health conditions is important but not the most accurate answer. Prevention is not totally impossible. Folic acid is important but has the most impact on preventing neural tube defects.