On the one hand, the first eigenvalue is clearly the most relevant one and it is associated both to visible pulsatility as well as an increasing trend.
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Force Trends and Pulsatility for Catheter Contact Identification in Intracardiac Electrograms during Arrhythmia Ablation.
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The sentences
On the other hand, the second eigenvalue shows a decreasing trend, again consistent with those cases when the local average force is reduced at the end of the force recording period.