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Upper Extremity Motor Evoked Potentials and Hand Function in Elderly Stroke Survivors: A Correlational Study.

Woo-Hwa Choi1, Jae-Eun Park1, Seong Jin1

  • 1Department of Physical Medicine and Rehabilitation, Veterans Health Service Medical Center, Seoul 05368, Republic of Korea.

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Summary

Motor evoked potential (MEP) latency, not amplitude, predicts upper extremity function recovery in older stroke survivors. Faster MEP latency indicates better outcomes, aiding personalized geriatric stroke rehabilitation planning.

Keywords:
hand functionmotor evoked potentialsstroke rehabilitationupper extremity function

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Area of Science:

  • Neuroscience
  • Geriatric Medicine
  • Rehabilitation Science

Background:

  • Stroke significantly impacts upper extremity function in older adults, necessitating precise recovery prediction.
  • Motor evoked potentials (MEP) show promise for predicting upper extremity recovery post-stroke, but geriatric-specific research is limited.
  • This study addresses the gap by investigating MEP parameters in patients aged 65 and older.

Purpose of the Study:

  • To investigate correlations between MEP parameters (amplitude and latency) and upper extremity function in older adults post-stroke.
  • To assess the predictive value of MEPs for functional recovery using measures like the MRC scale, K-MBI, and HFT.
  • To explore the utility of MEP latency and amplitude in geriatric stroke prognostication.

Main Methods:

  • A multiple linear regression model was employed to predict upper extremity outcomes.
  • The study included 90 stroke patients, assessed for MEPs either ≤3 months or >3 months post-stroke.
  • Correlations were examined between MEP parameters and functional measures including grip strength, pinch strength, Box and Block Test, and 9-Hole Peg Test.

Main Results:

  • MEP amplitude and latency showed significant correlations with upper extremity function in both early and late assessment groups.
  • MEP latency was significantly associated with grip strength and the Box and Block Test.
  • Initial upper extremity parameters were significantly associated with follow-up K-MBI and HFT results.

Conclusions:

  • Larger MEP amplitude and faster MEP latency correlate with better upper extremity function in stroke patients.
  • In older adults, MEP latency offers greater predictive value for upper extremity recovery than MEP amplitude.
  • MEP latency assessment should be integrated into geriatric stroke prognostication, complementing existing tools like PREP2, to guide personalized rehabilitation.