Nokea
A nurse in the ICU is planning the care of a patient who is being treated for shock. Which of the following statements best describes the pathophysiology of this patients health problem?
- A. Blood is shunted from vital organs to peripheral areas of the body.
- B. Cells lack an adequate blood supply and are deprived of oxygen and nutrients.
- C. Circulating blood volume is decreased with a resulting change in the osmotic pressure gradient.
- D. Hemorrhage occurs as a result of trauma, depriving vital organs of adequate perfusion.
Correct Answer: B
Rationale: Shock is a life-threatening condition with a variety of underlying causes. Shock is caused when the cells have a lack of adequate blood supply and are deprived of oxygen and nutrients. In cases of shock, blood is shunted from peripheral areas of the body to the vital organs. Hemorrhage and decreased blood volume are associated with some, but not all, types of shock.
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The acute care nurse is providing care for an adult patient who is in hypovolemic shock. The nurse recognizes that antidiuretic hormone (ADH) plays a significant role in this health problem. What assessment finding will the nurse likely observe related to the role of the ADH during hypovolemic shock?
- A. Increased hunger
- B. Decreased thirst
- C. Decreased urinary output
- D. Increased capillary perfusion
Correct Answer: C
Rationale: During hypovolemic shock, a state of hypernatremia occurs. Hypernatremia stimulates the release of ADH by the pituitary gland. ADH causes the kidneys to retain water further in an effort to raise blood volume and blood pressure. In a hypovolemic state the body shifts blood away from anything that is not a vital organ, so hunger is not an issue; thirst is increased as the body tries to increase fluid volume; and capillary perfusion decreases as the body shunts blood away from the periphery and to the vital organs.
A critical care nurse is aware of similarities and differences between the treatments for different types of shock. Which of the following interventions is used in all types of shock?
- A. Aggressive hypoglycemic control
- B. Administration of hypertonic IV fluids
- C. Early provision of nutritional support
- D. Aggressive antibiotic therapy
Correct Answer: C
Rationale: Nutritional support is necessary for all patients who are experiencing shock. Hyperglycemic (not hypoglycemic) control is needed for many patients. Hypertonic IV fluids are not normally utilized and antibiotics are necessary only in patients with septic shock.
The nurse in the ICU is caring for a 47-year-old, obese male patient who is in shock following a motor vehicle accident. The nurse is aware that patients in shock possess excess energy requirements. What would be the main challenge in meeting this patients elevated energy requirements during prolonged rehabilitation?
- A. Loss of adipose tissue
- B. Loss of skeletal muscle
- C. Inability to convert adipose tissue to energy
- D. Inability to maintain normal body mass
Correct Answer: B
Rationale: Nutritional energy requirements are met by breaking down lean body mass. In this catabolic process, skeletal muscle mass is broken down even when the patient has large stores of fat or adipose tissue. Loss of skeletal muscle greatly prolongs the patients recovery time. Loss of adipose tissue, the inability to convert adipose tissue to energy, and the inability to maintain normal body mass are not main concerns in meeting nutritional energy requirements for this patient.
When circulatory shock occurs, there is massive vasodilation causing pooling of the blood in the periphery of the body. An ICU nurse caring for a patient in circulatory shock should know that the pooling of blood in the periphery leads to what pathophysiological effect?
- A. Increased stroke volume
- B. Increased cardiac output
- C. Decreased heart rate
- D. Decreased venous return
Correct Answer: D
Rationale: Pooling of blood in the periphery results in decreased venous return. Decreased venous return results in decreased stroke volume and decreased cardiac output. Decreased cardiac output, in turn, causes decreased blood pressure and, ultimately, decreased tissue perfusion. Heart rate increases in an attempt to meet the demands of the body.
The ICU nurse is caring for a patient in neurogenic shock following an overdose of antianxiety medication. When assessing this patient, the nurse should recognize what characteristic of neurogenic shock?
- A. Hypertension
- B. Cool, moist skin
- C. Bradycardia
- D. Signs of sympathetic stimulation
Correct Answer: C
Rationale: In neurogenic shock, the sympathetic system is not able to respond to body stressors. Therefore, the clinical characteristics of neurogenic shock are signs of parasympathetic stimulation. It is characterized by dry, warm skin rather than the cool, moist skin seen in hypovolemic shock. Another characteristic is hypotension with bradycardia, rather than the tachycardia that characterizes other forms of shock.