Left stellectomy and denervation supersensitivity in conscious dogs

Area of Science:

• Cardiovascular Physiology
• Autonomic Nervous System Pharmacology

Background:

• Left stellectomy is a surgical procedure involving the removal of the left stellate ganglion.
• Denervation supersensitivity is a potential consequence of surgical denervation, where receptors become more sensitive to neurotransmitters.

Purpose of the Study:

• To investigate whether left stellectomy induces denervation supersensitivity.
• To evaluate the antiarrhythmic effects of left stellectomy.

Main Methods:

• Conscious dogs (n=12) underwent left stellectomy.
• Norepinephrine was administered via bolus injection or infusion before and after surgery.
• Left ventricular pressure derivative (dP/dt max) and premature ventricular complexes were measured.

Main Results:

• Left stellectomy did not alter baseline dP/dt max or norepinephrine-induced increases in dP/dt max.
• The number of premature ventricular complexes significantly decreased post-stellectomy.
• Ventricular tachycardia observed pre-stellectomy did not occur post-stellectomy.

Conclusions:

• Left stellectomy does not result in denervation supersensitivity.
• Left stellectomy exhibits significant antiarrhythmic properties, reducing ventricular arrhythmias.