Author Question: With anaphylactic shock, which mechanism results in a decreased cardiac output? a. Peripheral ... (Read 64 times)

bclement10 · **on:** Jun 25, 2018

With anaphylactic shock, which mechanism results in a decreased cardiac output?

a. Peripheral vasodilation
b. Increased cardiac output
c. Decreased alveolar ventilation
d. Fluid retention resulting in congestive heart failure

Question 2

Which of the following will cause a nurse to suspect that a patient's pulmonary contusion is worsening?

a. A pulmonary artery catheter showing a central venous pressure of 6 cm H2O and a wedge pressure of 8 mm Hg
b. An increased need for pain medication
c. An arterial blood gas value that demonstrates respiratory alkalosis
d. Increased peak airway pressures on the ventilator

macagnavarro · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

A
Peripheral vasodilation results in decreased venous return. This decreases intravascular volume and the development of relative hypovolemia. Decreased venous return results in decreased stroke volume and a fall in cardiac output.

Answer to Question 2

D
A contusion manifests initially as a hemorrhage followed by alveolar and interstitial edema. The edema can remain rather localized in the contused area or can spread to other lung areas. Inflammation affects alveolar-capillary units. As more units are affected by inflammation, further pathophysiologic events can occur, including decreased compliance, increased pulmonary vascular resistance, and decreased pulmonary blood flow. These processes result in a ventilationperfusio n imbalance that results in progressive hypoxemia and poor ventilation over a 24- to 48-hour period.