With anaphylactic shock, which mechanism results in a decreased ...

[bclement10]

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]

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.

[bclement10]

Excellent

[nanny]

TYSM