Bipolar I, bipolar II, and cyclothymic disorder: Clinical sciences

Bipolar spectrum disorders refer to psychiatric conditions characterized by mood instability, which cause a sudden shift in how a person thinks, feels, and behaves. These disorders can lead to significant personal distress, strain relationships, and impair occupational functioning. Additionally, the depressive symptoms in bipolar spectrum disorders significantly increase the risk of self-harm and suicidality. Bipolar spectrum disorders include bipolar 1 disorder, bipolar 2 disorder, and cyclothymic disorder.

Now, when a patient presents with a chief concern suggesting a bipolar spectrum disorder, first perform a safety assessment to determine the risk of self-harm or harm to others. Look for signs of psychosis such as agitation, paranoia, aggression, auditory or visual hallucinations, and disorganized thoughts, speech, or behavior. Also, watch for manic symptoms like fast talking, reduced need for sleep, and an increase in goal-directed activity. Be sure to ask about thoughts of harming oneself or others and assess their severity and intent including any plans or actions.

Patients with psychosis, mania, active thoughts of harm, or suicidal tendencies are at high risk and need acute management involving psychiatric hospitalization, pharmacologic stabilization, and a one-to-one sitter, if appropriate. In severe or resistant cases, consider electroconvulsive therapy or ECT.

On the other hand, if the patient is at low risk of harm to self and others, obtain a focused history and physical exam. They may describe a persistently euphoric, irritable, or depressed mood that is significantly different from their baseline and may report frequent mood changes. Also, be sure to ask about the family history of bipolar disorder among first-degree relatives because there is a strong genetic component.

The physical exam may reveal changes in appearance, such as being unusually unkempt, or psychomotor changes, like slowed or agitated movements. Additionally, their rate of speech may be increased or decreased, and they may demonstrate extremes of affect, ranging from flat to exaggerated facial expressions. With these findings, suspect bipolar spectrum disorder.

Here’s a clinical pearl! During history and physical exams, look for signs that your patient's mood symptoms could be attributed to a medical condition or substance use. For example, they might have hypothyroidism contributing to depression, or encephalitis presenting with manic symptoms. Additionally, intoxication or withdrawal from substances like alcohol, cocaine, amphetamines, opioids, and benzodiazepines can also lead to mood disturbances.

Okay, your next step is to assess for a current or past manic episode using DSM-5 criteria. Manic episodes have a persistently euphoric or irritable mood with increased energy. There must be at least 3 of the following symptoms, easily remembered using the mnemonic DIG-FAST: Distractibility; Irresponsibility, characterized by risky behaviors like reckless driving, shopping sprees, and sexual indiscretion; Grandiosity and unrealistic self-confidence; Flight of ideas; increased goal-oriented Activities with excessive planning, multitasking, and increased sociability and sexual drive; psychomotor Agitation; decreased Sleep yet feeling refreshed and lively; and rapid, hard-to-interrupt Talkativeness.

Manic symptoms may co-occur with psychotic features such as hallucinations, delusions, or disorganized thought patterns. These symptoms should persist for at least one week, or any duration requiring hospitalization due to severity, and they must cause clinically significant impairment. If all criteria are met for a current or past manic episode, diagnose bipolar 1 disorder.

Here’s another clinical pearl! Mood episodes in bipolar 1 alternate between mania, hypomania, and depression. These episodes are often interspersed with periods of stable mood, but a person may switch directly from one pole, mania, to the other pole, depression.

Moving on, the initial treatment of bipolar 1 disorder involves monotherapy with a single mood stabilizer like lithium, valproate, or lamotrigine. If ineffective, consider adding a second-generation antipsychotic such as quetiapine, olanzapine, risperidone, or aripiprazole. In cases of severe treatment resistance, consider ECT, or even transcranial magnetic stimulation, also called TMS. Finally, there should be maintenance with long-term pharmacotherapy, alongside psychoeducation and psychotherapy.

Time for some high-yield facts! Lithium, valproate, and lamotrigine are mood stabilizers frequently used in the management of bipolar spectrum disorders. Lithium and valproate are effective at treating acute mania and can also be used as long-term treatment to prevent manic and depressive episodes. On the other hand, lamotrigine is primarily used to manage bipolar depression and may be continued long-term to prevent depressive episodes. Each of these medications requires some clinical oversight to ensure safety and effectiveness. For example, lithium and valproate require regular blood tests to monitor therapeutic levels and avoid toxicity, while lamotrigine carries a risk of severe skin reactions, such as Stevens-Johnson syndrome.