Sunday, November 23, 2008

Post-activation facilitation and exhaustion

1. What is post-activation facilitation? When is it performed?
2. What is post-activation exhaustion? When is this test performed?

Answer:
1. PAF is a 10 second isometric contraction (or tetany-producting stim of 50 Hz) that is done if decrement is noted on LRRS.
2. Response seen as CMAP amplitude decreases, which occurs with a LRRS performed every minute for 5 mins after initial isometric contraction. This test should be used if there is no decrement with LRRS, but a neuromusc junction disorder is still suspected.

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