PET in patients with clear-cut multiple chemical sensitivity (MCS)

Area of Science:

• Neurology
• Environmental Medicine
• Medical Imaging

Background:

• Multiple chemical sensitivity (MCS) is a complex condition where patients report adverse reactions to low environmental chemical concentrations.
• Previous hypotheses suggested neurotoxic or neuroimmunological brain alterations in MCS, potentially detectable by neuroimaging techniques like PET and SPECT.
• The diagnostic utility of PET and SPECT in MCS remains controversial and unproven.

Purpose of the Study:

• To systematically investigate functional brain changes in patients with multiple chemical sensitivity using Positron Emission Tomography (PET).
• To assess whether PET imaging can detect neurotoxic or neuroimmunological alterations in the brain of MCS patients as hypothesized.
• To provide objective neuroimaging data to inform the understanding and diagnosis of MCS.

Main Methods:

• Positron Emission Tomography (PET) was employed to scan 12 patients diagnosed with multiple chemical sensitivity.
• Brain glucose metabolism was analyzed as a primary indicator of functional brain activity.
• Patient PET data were compared with findings from normal control subjects.

Main Results:

• One out of 12 MCS patients exhibited mild glucose hypometabolism.
• The overall analysis of the patient group revealed no statistically significant functional brain changes when compared to healthy controls.
• No evidence of widespread or significant neurotoxic or neuroimmunological alterations was found via PET.

Conclusions:

• This systematic PET study represents the first of its kind in a cohort of MCS patients.
• The findings do not support the hypothesis of significant neurotoxic or neuroimmunological brain changes in MCS detectable by PET.
• The study suggests that current neuroimaging methods like PET may not be appropriate for diagnosing functional brain alterations in MCS.