A pigtail catheter is primarily used for which purpose during left heart catheterization?

• A. Right atrial pressure measurement
• B. Selective engagement of the left coronary system
• C. Aortography and ventriculography to document aortic root and LV size/function
• D. Pulmonary artery catheterization

Answer: (C)

The key idea is that a pigtail catheter is designed for reliable contrast injections to image large chambers and vessels during left heart studies. Its curved distal tip with multiple side holes lets contrast distribute evenly when performing aortography and ventriculography, yielding clear images of the aortic root and the left ventricle’s size and function. This setup supports assessment of LV function (e.g., ejection fraction, wall motion) and aortic root dimensions, which are central to left heart catheterization. Other catheters are preferred for different tasks: selective engagement of the left coronary arteries uses dedicated coronary catheters, while right atrial pressure measurement and pulmonary artery catheterization rely on venous access or a Swan-Ganz catheter, respectively. That’s why this option best fits the use of a pigtail catheter during left heart catheterization.