The rate of conversion from radial to femoral access during neuroendovascular procedures can vary depending on the specific patient population, the experience of the interventionalist, and the complexity of the procedure. In the literature, the reported conversion rates range from around 5% to 15%. It is important to note that these rates may vary depending on the factors mentioned above.
Conversion from radial to femoral access may be necessary due to various reasons, including radial artery spasm, small or tortuous radial arteries, difficulty navigating through the subclavian and brachiocephalic arteries, or inability to select the target vessels with the available radial catheters and devices.
As the experience and expertise with the transradial approach for neuroendovascular procedures continue to grow, the conversion rates may decrease. Moreover, the development of new devices and techniques specifically designed for radial access may further improve the success rates and reduce the need for conversion to femoral access.