What is bilateral vagotomy in arterial blood pressure

Here's why:

• Loss of Parasympathetic Tone: The vagus nerves provide significant parasympathetic (inhibitory) input to the heart, slowing the heart rate. When these nerves are cut, this inhibitory influence is removed.
• Increased Heart Rate: Without vagal inhibition, the heart's intrinsic pacemaker (SA node) beats at its faster, inherent rate, leading to a substantial increase in heart rate (denervation tachycardia).
• Increased Cardiac Output: The elevated heart rate results in an increased cardiac output (the volume of blood pumped by the heart per minute).
• Elevated Blood Pressure: Since arterial blood pressure is directly related to cardiac output (Blood Pressure = Cardiac Output × Total Peripheral Resistance), an increase in cardiac output, without a compensatory decrease in peripheral resistance, leads to a rise in arterial blood pressure.

This procedure also impairs the baroreflex, making blood pressure regulation less stable.