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Polymer degradation rates and persisting brain lesions post endovascular procedures
  1. Amitabh Madhukumar Chopra1,
  2. Juan Pablo Cruz2,
  3. Yin C Hu3,
  4. Sameer A Ansari4,
  5. Takayuki Kitamura5
  1. 1 Chemical Engineer / Medical Researcher, Self-Employed, Hamilton, Ontario, Canada
  2. 2 Department of Radiology, Hospital Clínico de la Pontificia Universidad Católica de Chile, Santiago, Chile
  3. 3 Department of Neurosurgery, UH Cleveland Medical Center, Cleveland, Ohio, USA
  4. 4 Department of Radiology, Neurology, and Neurological Surgery, Northwestern University, Chicago, Illinois, USA
  5. 5 Department of Neurosurgery and Neuroendovascular Therapy, Juntendo University Faculty of Medicine, Tokyo, Japan
  1. Correspondence to Amitabh Madhukumar Chopra, Chemical Engineer / Medical Researcher, Hamilton, Canada; amitabh.m.chopra{at}

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Polymer coating emboli have been affiliated with persisting brain lesions after endovascular procedures.1–6 Patient symptoms include headaches, fevers, chills (ie, constitutional symptoms), neurological presentations of focal weakness, sensory and visual deficits, and seizures. Follow-up imaging highlights distinct areas of contrast enhancement in slightly different locations, with some lesions increasing in number and size (see figure 1). Polymer particles from various coating compositions have different rates of degradation, absorption, and metabolism or excretion (DAM/E). These varied rates of DAM/E may have impacts on persisting brain lesions, recurrent patient symptoms, and adverse event outcomes.

Figure 1

Characteristic MRI of patients with persisting brain lesions. T1 postcontrast images highlighting an increase in the number and size of lesions (white arrows) over a 12 month period. Also note formation of new enhancing lesions. Images used with permission by Williams and Wilkins Co. (license ID: 1100407-1).

Degradation is the chemical breakdown of a polymer by hydrolysis, oxidation, or enzymatic processes. A faster degradation rate may result in less obstruction within blood vessels or …

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  • Contributors All authors have contributed to and approve this manuscript.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.