Key result
Introducing mechanical damping in catheter-manometer systems achieves a flat frequency response up to 30 Hz, allowing reliable computation of instantaneous blood velocity and pressure derivatives.
A simple mechanical damping method for catheter-manometer systems enables accurate recording of pressure gradients and computation of instantaneous blood velocity.
A simple method for introducing mechanical damping in catheter-manometer systems so that a flat frequency response throughout 30 Hz can be realized easily is described. This allows reliable computation of instantaneous blood velocity by the pressure gradient technique, since the bandwidth available, dc to 22 Hz, allows accurate recording of the pressure gradient, even when long catheters are used. Similarly, the first time derivative of the intraventricular pressure pulse can be obtained without difficulty.
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Lapointe et al. (1974) studied this question. Mechanical damping in catheter-manometer systems was evaluated. Introducing mechanical damping in catheter-manometer systems achieves a flat frequency response up to 30 Hz, allowing reliable computation of instantaneous blood velocity and pressure derivatives.
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