Cardiovascular Overview

Every question here, with the answer

1. At 08:00, a nurse reviews a report describing increased pressure required during ventricular contraction. The draft nursing note says, "Cardiac output increased." Which replacement accurately documents the reported change without substituting a different measurement?

   1. Afterload increased.
   2. Cardiac output increased.
   3. Stroke volume increased.
   4. Preload increased.

   Answer: Afterload increased.

   The reported change concerns the pressure required during ventricular contraction, which the section identifies as afterload. Preload concerns stretch before contraction; stroke volume and cardiac output concern blood volume, so their increases are not established by this report.

2. At 11:00, a nurse prepares a patient-teaching summary using a diagram that moves from ventricular filling to ventricular contraction. Which statements about the aortic and pulmonic valves should be included? Select all that apply.

   1. The aortic valve closes during ventricular filling.
   2. The aortic valve remains closed during ventricular contraction.
   3. The pulmonic valve closes during ventricular filling.
   4. The pulmonic valve opens to allow ventricular filling.
   5. Both valves open during ventricular contraction.

   Answer: The aortic valve closes during ventricular filling., The pulmonic valve closes during ventricular filling., Both valves open during ventricular contraction.

   Both the aortic and pulmonic valves close during ventricular filling and open during ventricular contraction. Describing the pulmonic valve as opening for filling or the aortic valve as remaining closed during contraction reverses the sequence given in the section.

3. At 19:00 handoff, a nurse notices that a draft summary labels the blood volume ejected during one left-ventricular systolic contraction as "cardiac output per minute." Which correction preserves the measurement actually described?

   1. Change the label to stroke volume and retain the description of blood ejected during one systolic contraction.
   2. Change the label to afterload and describe the measurement as pressure exerted during contraction.
   3. Change the label to preload and describe the measurement as ventricular stretch before contraction.
   4. Keep the cardiac output label and change the description to blood pumped through the aorta each minute.

   Answer: Change the label to stroke volume and retain the description of blood ejected during one systolic contraction.

   Stroke volume describes blood ejected from the left ventricle during systolic contraction, so changing only the label preserves the reported measurement. Rewriting it as a per-minute volume would substitute cardiac output for the original measurement. Preload and afterload describe stretch and pressure, respectively, rather than the blood volume reported here.

4. At 08:00, you review a handoff draft that labels the amount of blood ejected from the left ventricle during one systolic contraction as "cardiac output." Which revision accurately documents what the measurement represents?

   1. Replace "cardiac output" with "preload" because the measurement concerns ventricular blood volume.
   2. Keep "cardiac output" because the measurement describes blood leaving the heart.
   3. Replace "cardiac output" with "afterload" because the measurement concerns ventricular contraction.
   4. Replace "cardiac output" with "stroke volume" because the measurement describes blood ejected during a systolic contraction.

   Answer: Replace "cardiac output" with "stroke volume" because the measurement describes blood ejected during a systolic contraction.

   Stroke volume describes the amount of blood pumped from the left ventricle during systolic contraction, whereas cardiac output describes output per minute. Preload concerns initial stretch before contraction, and afterload concerns the pressure required during contraction—not the amount ejected.

5. At 10:00, you notice that a draft patient-education note uses "preload" and "afterload" interchangeably. Which replacement accurately documents the distinction taught in the section?

   1. Preload describes initial cardiac-cell stretch before contraction; afterload describes the pressure the heart must exert during ventricular contraction.
   2. Preload and afterload both describe cardiac-cell stretch, with preload occurring before contraction and afterload occurring during contraction.
   3. Preload and afterload both describe pressure, with preload occurring before contraction and afterload occurring during contraction.
   4. Preload describes the pressure the heart must exert during ventricular contraction; afterload describes initial cardiac-cell stretch before contraction.

   Answer: Preload describes initial cardiac-cell stretch before contraction; afterload describes the pressure the heart must exert during ventricular contraction.

   The correct entry distinguishes initial stretch before contraction from pressure exerted during ventricular contraction. The other entries either reverse the terms or incorrectly describe both as measurements of the same property.

6. At 13:00, a patient's teach-back reverses when the aortic and pulmonic valves open and close. You review the two phases again before completing the teaching note. Which statements accurately document the explanation provided? Select all that apply.

   1. The aortic and pulmonic valves open during ventricular filling.
   2. The aortic and pulmonic valves open during ventricular contraction.
   3. The aortic and pulmonic valves close during ventricular filling.
   4. The aortic and pulmonic valves alternate, with one opening while the other closes during ventricular filling.
   5. The aortic and pulmonic valves close during ventricular contraction.

   Answer: The aortic and pulmonic valves open during ventricular contraction., The aortic and pulmonic valves close during ventricular filling.

   Both valves close during ventricular filling and open during ventricular contraction. The other statements reverse those phases or incorrectly assign opposite actions to the two valves.

7. At 15:00, a patient says, "The sinoatrial node is the pacemaker, so nothing elsewhere in the body can influence the heart's electrical impulse." Which clarification should your follow-up teaching note record?

   1. Adrenal influences can affect the heart's electrical impulse, but brain influences and changes in volume status cannot.
   2. The sinoatrial node generates an impulse; volume changes affect filling but cannot influence the heart's electrical impulse.
   3. The brain can influence the heart's electrical impulse, but adrenal influences and changes in volume status cannot.
   4. The sinoatrial node generates an impulse; adrenal influences, the brain, and changes in volume status can also influence it.

   Answer: The sinoatrial node generates an impulse; adrenal influences, the brain, and changes in volume status can also influence it.

   The section identifies the sinoatrial node as the native pacemaker while also describing adrenal, brain, and volume-status influences on the heart's electrical impulse. Each alternative incorrectly excludes one or more of those influences.

8. At 16:30, you are completing a teaching note after reviewing myocardial electrical activity. The draft has blank spaces for the directions of sodium and potassium movement. Which statements can you insert to match the explanation in the section? Select all that apply.

   1. Sodium ions move into the myocardial cell.
   2. Potassium ions move into the myocardial cell.
   3. Both sodium and potassium ions move into the myocardial cell.
   4. Potassium ions move out of the myocardial cell.
   5. Sodium ions move out of the myocardial cell.

   Answer: Sodium ions move into the myocardial cell., Potassium ions move out of the myocardial cell.

   The section describes sodium ions going in and potassium ions going out as part of the exchanges associated with the impulse. The remaining statements reverse one ion's direction or incorrectly place both movements inward.