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1 results

  • Chapter 13 - Focal Lesions

  • from Part II - Case-Based Approach to Specific Conditions
  • Neville M. Jadeja, University of Massachusetts Medical School, Kyle C. Rossi, University of Massachusetts Medical School
  • Book:
    Critical Care EEG Basics
    Published online:
    22 February 2024
    Print publication:
    29 February 2024, pp 182-190

  • Summary

    This chapter uses a case-based approach to discuss the electrographic patterns associated with focal cortical lesions in critically ill patients. Focal amplitude attenuation and/or slowing may suggest an underlying physiological dysfunction or a structural lesion. Additionally, epileptiform abnormalities such as sharp waves within the region may suggest increased seizure risk. A focal pattern of higher amplitudes, sharper morphologies, and faster activities is characteristic of breach effect from a craniotomy. Lateralized rhythmic delta activity (LRDA) is a pattern of rhythmic focal slowing that is associated with increased seizure risk. Epilepsia partialis continua (EPC) is an unusual form of focal motor status epilepticus that is often refractory to antiseizure medications. This pattern may be seen in a rare form of focal epilepsy called Rasmussen syndrome among other causes.