What type of tracings are used to determine valvular gradient magnitudes in a hemodynamic assessment?

• A. Peak pressures from each chamber and mean transvalvular gradient
• B. ECG tracings
• C. Oxygen saturation traces
• D. Temperature traces

Answer: (A)

Valvular gradients come from pressure tracings obtained with catheters placed on both sides of the valve. By measuring the peak pressures in the chamber before the valve and in the chamber after the valve, you can compute the transvalvular gradient as the difference between those pressures. The peak gradient is the maximum instantaneous difference, while the mean gradient is the average pressure difference across the valve throughout systole. This is how we quantify how severely a valve is obstructed.

Other tracings aren’t used for this purpose: ECG traces show electrical activity, oxygen saturation traces assess shunts and mixing of blood, and temperature traces are used for thermodilution cardiac output measurements, not to determine valvular pressure differences.