CAA Physiology and Pathophysiology in Anesthesia — Questions and Answers
Question 1: How does anesthesia affect the cardiovascular system?
- Increases heart rate and blood pressure
- Decreases blood pressure due to vasodilation (Correct answer)
- Causes severe hypertension
- Has no effect on the cardiovascular system
Correct answer: Decreases blood pressure due to vasodilation
Most anesthetic agents cause vasodilation and myocardial depression, leading to a decrease in blood pressure.
Question 2: Which organ system is most affected by anesthetic agents during surgery?
- Gastrointestinal system
- Respiratory system (Correct answer)
- Endocrine system
- Musculoskeletal system
Correct answer: Respiratory system
The respiratory system is heavily influenced by anesthesia, as many agents depress respiratory function and require ventilatory support.
Question 3: What is the primary cause of malignant hyperthermia?
- Allergic reaction to anesthetics
- Uncontrolled calcium release in muscle cells (Correct answer)
- Sudden drop in blood pressure
- Respiratory acidosis
Correct answer: Uncontrolled calcium release in muscle cells
Malignant hyperthermia is caused by a genetic mutation that results in excessive calcium release in muscle cells in response to certain anesthetics.
Question 4: Why do some anesthetic agents cause respiratory depression?
- They increase lung compliance
- They depress the central respiratory centers (Correct answer)
- They stimulate excessive oxygen consumption
- They cause bronchoconstriction
Correct answer: They depress the central respiratory centers
Many anesthetics act on the central nervous system by depressing respiratory centers in the brainstem, reducing respiratory rate and tidal volume.
Question 5: What is the physiological response to hypoxia during anesthesia?
- Decrease in respiratory rate
- Increase in heart rate and respiratory rate (Correct answer)
- Complete cessation of breathing
- Vasoconstriction of peripheral vessels
Correct answer: Increase in heart rate and respiratory rate
Hypoxia triggers an increase in heart rate and respiratory rate to compensate for decreased oxygen levels in the blood.
Question 6: Which physiological factor determines how quickly an inhaled anesthetic takes effect?
- Lipid solubility
- Blood-gas partition coefficient (Correct answer)
- Serum potassium levels
- Renal clearance
Correct answer: Blood-gas partition coefficient
The blood-gas partition coefficient determines the solubility of an anesthetic in blood, affecting its onset of action.
CAA Physiology and Pathophysiology in Anesthesia
How does anesthesia affect the cardiovascular system?