What characterizes bradycardia in neurogenic shock?

What characterizes bradycardia in neurogenic shock?

• A. Increased heart rate due to stress.
• B. Reduced heart rate due to vagal tone loss.
• C. Normal heart rate despite low blood pressure.
• D. Heart rate fluctuating randomly.

Answer: (B)

Bradycardia in neurogenic shock is characterized by a reduced heart rate resulting from the loss of sympathetic tone and unopposed vagal tone. In neurogenic shock, which can occur after spinal cord injuries or significant central nervous system trauma, the autonomic nervous system fails to regulate the heart rate effectively. This leads to an imbalance where the parasympathetic nervous system (which slows the heart rate) becomes dominant due to the loss of sympathetic input, causing bradycardia. This physiological response is distinct from other types of shock where tachycardia is typically present due to the body's compensatory mechanisms in response to low blood pressure and stress. Understanding this mechanism is crucial as it highlights the unique presentation of bradycardia in neurogenic shock compared to other shock states characterized by reflex tachycardia.

Bradycardia in neurogenic shock is characterized by a reduced heart rate resulting from the loss of sympathetic tone and unopposed vagal tone. In neurogenic shock, which can occur after spinal cord injuries or significant central nervous system trauma, the autonomic nervous system fails to regulate the heart rate effectively. This leads to an imbalance where the parasympathetic nervous system (which slows the heart rate) becomes dominant due to the loss of sympathetic input, causing bradycardia.

This physiological response is distinct from other types of shock where tachycardia is typically present due to the body's compensatory mechanisms in response to low blood pressure and stress. Understanding this mechanism is crucial as it highlights the unique presentation of bradycardia in neurogenic shock compared to other shock states characterized by reflex tachycardia.