Which definition aligns with Bipolar I Disorder?

The definition that aligns with Bipolar I Disorder is centered around the presence of manic episodes that are significant and often require hospitalization. To meet the criteria for a diagnosis of Bipolar I Disorder, an individual must experience at least one manic episode, which lasts for a minimum of one week (or any duration if hospitalization is necessary) and may be preceded or followed by hypomanic or major depressive episodes.

The manic episodes are characterized by an elevated, expansive, or irritable mood, along with additional symptoms such as increased activity, energy, or restlessness. Severe mood changes and significant impairment in functioning are key elements of this disorder, making the duration of these episodes an important criterion for diagnosis.

Therefore, the focus on episodes of mania lasting for more than a week reflects the clinical understanding and criteria established in the DSM-5 for Bipolar I Disorder. The other options either misinterpret the nature of the episodes or describe symptoms that do not align with the manic episodes required for a Bipolar I diagnosis.