Table
Rapid cycling and ultra-rapid cycling BD: A comparison
Construct | Rapid cycling | Ultra-rapid cycling |
---|---|---|
Bipolar I vs II | Predominantly BD IIa | No systematic data |
Sex | Predominantly women | No systematic data |
Longitudinal course | May be a transient phenomenon that can occur at any timeb or an enduring phenomenon that may persist for yearsc | Ultradian patterns may be more common across the first several episodes among pediatric BD patientsd |
Age at onset | Associated with younger age at onsete | May be more evident in prepubescent onset mood disordersd; ultradian cycling more likely when onset occurs before age 13 than in adulthoode |
Diurnal variation in mood | Morning-to-evening mood switches usually involve depression to mania/hypomania, with the opposite typifying evening-to-morning mood switchesf | Not reported |
Relationship to environmental stresses | Life stresses may precede initial affective episodes but may be less important as subsequent episodes arise with increasing automaticity | No systematic data |
Relationship to menstrual cycle | Despite case reports and self-reported links between RC and menstrual mood exacerbations, prospective data do not identify associations between RC and menstrual patternsg,h | No systematic data |
Subclinical hypothyroidism | Bauer and Whybrow identified hypothyroidism independent of lithium use in 60% of 30 rapidly cycling BD patients, with evidence of improvement in a separate study of 11 RC patients given suprametabolic levothyroxine (reviewed by Bauer et ali) | No systematic data |
Relationship to psychosis | Nonea | No systematic data |
Relationship to antidepressant use | Naturalistic observations suggest RC may occur later in the illness course as a result of antidepressant use.c Small open case series data suggest shorter intermorbid intervals on antidepressants with longer intervals off antidepressants.j RC patients often receive antidepressants, but causal relationships are not well-documented.k Some case-control data dispute links between antidepressant use and RCl | No specific published cases |
Considerations for suicide risk | RC linked with more serious suicide attemptsl | Suicide attempts may be associated with cycling within an episodem or rapid shifting in moodn |
Time course for judging treatment efficacy | Efforts to diminish acute affective instability may be measured over the course of days to weeks | By definition, treatment of RC involves relapse prevention over the course of 1 year |
BD: bipolar disorder; RC: rapid cycling | ||
References a. Schneck CD, Miklowitz DJ, Calabrese JR, et al. Phenomenology of rapid-cycling bipolar disorder: data from the first 500 participants in the Systematic Treatment Enhancement Program. Am J Psychiatry. 2004;161(10):1902-1908. b. Coryell W, Endicott J, Keller M. Rapidly cycling affective disorder. Demographics, diagnosis, family history, and course. Arch Gen Psychiatry. 1992;49(2):126-131. c. Koukopoulos A, Sani G, Koukopoulos AE, et al. Duration and stability of the rapid-cycling course: a long-term personal follow-up of 109 patients. J Affect Disord. 2003;73(1-2):75-85. d. Geller B, Tillman R, Bolhofner K, et al. Child bipolar I disorder: prospective continuity with adult bipolar I disorder; characteristics of second and third episodes; predictors of 8-year outcome. Arch Gen Psychiatry. 2008;65(10):1125-1133. e. Post RM, Leverich GS, Kupka RW, et al. Early-onset bipolar disorder and treatment delay are risk factors for poor outcome in adulthood. J Clin Psychiatry. 2010;71(7):864-872. f. Feldman-Naim S, Turner EH, Leibenluft E. Diurnal variation in the direction of mood switches in patients with rapid-cycling bipolar disorder. J Clin Psychiatry. 1997;58(2):79-84. g. Leibenluft E, Ashman SB, Feldman-Naim S, et al. Lack of relationship between menstrual cycle phase and mood in a sample of women with rapid cycling bipolar disorder. Biol Psychiatry. 1999;46(4):577-580. h. Wehr TA, Sack DA, Rosenthal NE, et al. Rapid cycling affective disorder: contributing factors and treatment responses in 51 patients. Am J Psychiatry. 1988;145(2):179-184. i. Bauer M, Beaulieu S, Dunner DL, et al. Rapid cycling bipolar disorder—diagnostic concepts. Bipolar Disord. 2008;10(1 Pt 2):153-162. j. Wehr TA, Goodwin FK. Can antidepressants cause mania and worsen the course of affective illness? Am J Psychiatry. 1987;144(11):1403-1411. k. Schneck CD, Miklowitz DJ, Miyahara S, et al. The prospective course of rapid-cycling bipolar disorder: findings from the STEP-BD. Am J Psychiatry. 2008;165(3):370-377. l. Coryell W, Solomon D, Turvey C, et al. The long-term course of rapid-cycling bipolar disorder. Arch Gen Psychiatry. 2003;60(9):914-920. m. Fawcett J, Scheftner W, Clark D, et al. Clinical predictors of suicide in patients with major affective disorders: a controlled prospective study. Am J Psychiatry. 1987;144(1):35-40. n. MacKinnon DF, Potash JB, McMahon FJ, et al. Rapid mood switching and suicidality in familial bipolar disorder. Bipolar Disord. 2005;7(5):441-448. |
From a biologic perspective, a handful of preliminary studies have examined genetic markers or familial patterns that might be related to rapid cycling (RC) or ultra-rapid cycling (URC). These include a reported link between URC and the low activity variant of the catechol-o-methyltransferase gene polymorphism in a small group of patients with velo-cardio-facial syndrome,a although this finding was not replicated in a larger sample.a Other preliminary reports on RC have implicated both the long (l) and short (s) allelic variants of the serotonin transporter gene (SLC6A4), the val66met variant of the brain-derived neurotrophic factor gene, and the circadian cryptochrome 2 (CRY2) gene (reviewed by Bauer et alb). These candidate loci have been examined in RC but not URC.
URC has not been examined as a familial entity, although in the National Institute of Mental Health Collaborative Depression Study, DSM-IV-TR RC did not occur with elevated frequency in bipolar pedigrees.c Rapid mood switches—abrupt rather than gradual transitions from one affective pole to another—appear to be only slightly, nonsignificantly more common in first-degree bipolar relatives of BD patients who themselves have rapid rather than gradual transitions from one affective pole to the other.d
Neuroimaging studies in BD seldom focus on subpopulations with RC or URC, and have been confined mainly to case reports that have yielded limited, non-generalizable observations, such as state-dependent variations in prefrontal activity during tasks of facial recognition (reviewed by Bauer et alb).
References
a. Papolos DF, Veit S, Faedda GL, et al. Ultra-ultra rapid cycling bipolar disorder is associated with the low activity catecholamine-O-methyltransferase allele. Mol Psychiatry. 1998;3(4):346-349.
b. Bauer M, Beaulieu S, Dunner DL, et al. Rapid cycling bipolar disorder—diagnostic concepts. Bipolar Disord. 2008;10(1 Pt 2):153-162.
c. Coryell W, Endicott J, Keller M. Rapidly cycling affective disorder. Demographics, diagnosis, family history, and course. Arch Gen Psychiatry. 1992;49(2):126-131.
d. MacKinnon DF, Potash JB, McMahon FJ, et al. Rapid mood switching and suicidality in familial bipolar disorder. Bipolar Disord. 2005;7(5):441-448.