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Related Concept Videos

Bipolar Disorder01:30

Bipolar Disorder

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Bipolar disorder is a chronic mental health condition marked by significant mood fluctuations, including episodes of mania and depression. Elevated energy levels, heightened mood or irritability, impulsive behavior, reduced sleep needs, rapid speech, racing thoughts, inflated self-esteem, and distractibility characterize mania. Individuals with bipolar disorder often alternate between depressive and manic states, with periods of emotional stability lasting an average of six months to a year.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Mania, a psychological condition characterized by elevated mood, increased energy, and reduced sleep need, is part of the bipolar disorder cycle. The exact cause of mania isn't entirely known, but it is thought to be a combination of genetic, environmental, and neurological factors. Bipolar disorder involves alternating manic and depressive episodes. Mood stabilizers like lithium, antipsychotics, and anticonvulsants help manage these episodes. Lithium carbonate is particularly effective as...
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Investigating light sensitivity in bipolar disorder (HELIOS-BD).

Amber Roguski1,2, Nicole Needham1,2, Tom MacGillivray2,3

  • 1Division of Psychiatry, The University of Edinburgh, Edinburgh, Scotland, UK.

Wellcome Open Research
|May 8, 2024
PubMed
Summary
This summary is machine-generated.

People with bipolar disorder (BD) may have retinal hypersensitivity to light, disrupting circadian rhythms. Lithium treatment could reduce this sensitivity, stabilizing mood and rest/activity cycles in BD patients.

Keywords:
Bipolar disordercircadian rhythmlight sensitivitylithiummelatoninretinasleepvision

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Chronobiology

Background:

  • Bipolar disorder (BD) is frequently associated with disrupted circadian rhythms, impacting sleep-wake cycles and mood regulation.
  • Individuals with BD may exhibit heightened sensitivity to light, exacerbating circadian dysfunction and increasing susceptibility to mood episodes.
  • Lithium is a primary long-term treatment for BD, yet its precise mechanism, particularly concerning circadian rhythm stabilization, requires further elucidation.

Purpose of the Study:

  • To investigate the hypothesis that pathophysiological retinal changes in bipolar disorder (BD) lead to light hypersensitivity and circadian rhythm dysfunction.
  • To explore the potential of lithium in mitigating light hypersensitivity and stabilizing circadian rhythms in individuals with BD.
  • To assess visual and non-visual light responses and retinal microstructure in BD patients compared to healthy controls.

Main Methods:

  • Recruitment of 180 participants for the HELIOS-BD study, including individuals with bipolar disorder and healthy controls.
  • Assessment of visual and non-visual responses to light, alongside retinal microstructure analysis over an 18-month period.
  • Comparison of light responses and retinal changes between BD patients treated with lithium and those not on lithium.

Main Results:

  • Preliminary findings suggest potential differences in light responses and retinal structure between BD patients and controls.
  • Exploration of whether lithium treatment is associated with attenuated light responses and retinal changes in BD.
  • Comprehensive analysis of visual and non-visual light sensitivity in a large BD cohort.

Conclusions:

  • This research aims to elucidate the role of retinal light sensitivity in bipolar disorder (BD) pathophysiology and circadian disruption.
  • Findings may support lithium's efficacy by demonstrating its potential to normalize light responses and stabilize circadian rhythms.
  • The study holds significant translational potential for personalized treatment strategies and therapeutic innovations in bipolar disorder management.