Is white matter disease a demyelinating disease?

In MS, demyelination occurs in the white matter of the brain and in the spinal cord. Lesions or “plaques” then form where myelin is under attack by the immune system. Many of these plaques, or scar tissue, occur throughout the brain over the course of years.
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What does it mean when your heart is in sinus rhythm?

Sinus rhythm is the name given to the normal rhythm of the heart where electrical stimuli are initiated in the SA node, and are then conducted through the AV node and bundle of His, bundle branches and Purkinje fibres. Depolarisation and repolarisation of the atria and ventricles show up as 3 distinct waves on ECG.
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