Preparation for repeated study of left ventricular function in the conscious dog

Area of Science:

• Cardiovascular physiology
• Surgical techniques
• Animal models in research

Background:

• Assessing left ventricular hemodynamics is crucial for understanding cardiac function.
• Previous methods for chronic left heart catheterization in conscious animals can be invasive or complex.
• A need exists for a simpler, less traumatic approach to enable repeated measurements.

Purpose of the Study:

• To present a straightforward, nontraumatic method for chronic left heart catheter preparation.
• To enable the study of left ventricular hemodynamics in conscious dogs.
• To establish a reliable technique for repeated cardiovascular assessments.

Main Methods:

• An 8 Fr Cordis catheter was modified for implantation.
• The modified catheter was inserted into the left ventricle via transseptal puncture.
• The procedure was performed on 30 conscious dogs.

Main Results:

• Transseptal catheterization was achieved with minimal morbidity and mortality.
• The technique allowed for repeated left ventricular cineangiograms, pressure measurements, and cardiac output determinations.
• Dogs exhibited no apparent discomfort during or after the procedures.

Conclusions:

• This modified transseptal catheterization provides a simple and effective method for chronic left ventricular access in conscious dogs.
• The technique is well-tolerated, facilitating repeatable hemodynamic studies without significant adverse effects.
• This approach offers a valuable tool for advancing cardiovascular research using canine models.