Bipolar II edges out major depression once a partner's account of a five-day elevated stretch is credited, and the MN661 Unit 3 differential shows why four other candidates fall away. Searches like "mn 661 unit 3 assignment example", "mn661 unit 3 sample" and "mn661 unit 3 example" land here.
A Depressive Episode and a Remembered Spring: Ranked Differential Diagnosis for a 27-Year-Old Graphic Designer
[Student Name]
Purdue University Global
MN661: PMHNP Psychopathological Disorders and Psychotherapy
Unit 3 Assignment
[Instructor Name]
[Date]
Composite patient written as a model document. No real person is described.
Case Summary
Patient's account. For six weeks she has felt low most of the day, lost interest in drawing, slept ten hours a night and still woken tired, and struggled to meet deadlines. She has gained about 4 kg. She denies thoughts of suicide. She has had two similar periods since age 20, each lasting several weeks. She drinks two glasses of wine on weekends and denies other substance use. She takes no medications and has no significant medical history.
Partner's account, obtained with her permission. Last spring, for about five days, she barely slept, three or four hours a night, but seemed full of energy. She talked quickly, started four new projects, rearranged the apartment at night and bought a new tablet and two camera lenses she later returned. She was not hospitalized, kept working and "was actually more productive than usual." Friends noticed she seemed "different." She herself describes that week as "a really good week."
Basis for Ranking
Candidates are ranked by fit with the reported features first and base rate second. For each, the paper gives the case for it, the case against it and the one finding that decides it, with the source of that finding named.
1. Bipolar II Disorder
For: a current major depressive episode, previous depressive episodes and a distinct period of at least four consecutive days of elevated energy with decreased need for sleep, rapid speech, increased goal-directed activity and excessive spending, observed by others. Against: the patient does not recognize the spring week as abnormal. That is common, since hypomania often feels like being at one's best, and it means the diagnosis rests heavily on the partner's observations, which could be colored by the partner's own concerns. The partner's account is specific and describes behavior rather than impressions, which makes it more reliable than a general statement that she seemed "off." Her two earlier depressive periods also began in late winter, a pattern worth noting for any future seasonal component. Deciding finding (partner): five consecutive days of reduced sleep, pressured speech, a surge in projects and impulsive purchases, noticed by others but without marked impairment, meets the duration and symptom requirements for a hypomanic episode. Hypomania plus a major depressive episode, with no full manic episode, defines bipolar II disorder (American Psychiatric Association, 2022).
2. Major Depressive Disorder, Recurrent
For: current and past depressive episodes meeting criteria. Against: a past hypomanic episode excludes this diagnosis. Deciding finding (partner): the spring episode.
3. Cyclothymic Disorder
For: fluctuating mood. Against: cyclothymia requires at least two years of numerous periods of hypomanic and depressive symptoms that never meet full criteria for an episode; she has had full depressive episodes separated by long stable periods. Deciding finding (patient): the episodic pattern. Her mood between episodes is described by both her and her partner as steady for months at a time, which is the opposite of the constant low-level fluctuation cyclothymia describes.
4. Bipolar I Disorder
For: an episode of elevated mood. Against: mania requires at least a week of symptoms, or hospitalization, and marked impairment or psychosis. Deciding finding (partner): five days, kept working, no hospitalization or psychotic features. The distinction matters because the presence of a single manic episode would change both the diagnosis and the urgency of treatment.
5. Substance-Induced Mood Disorder
For: alcohol use. Against: two drinks on weekends is modest, and neither episode followed a change in use or a new medication. Deciding finding (patient): no temporal link to substances. A urine drug screen would still be reasonable, since stimulant use can produce a similar picture and patients do not always report it.
6. Borderline Personality Disorder
For: mood variability. Against: the mood shifts in borderline personality disorder typically last hours to a few days and are triggered by interpersonal stress; her episodes last days to weeks and are not described as reactions to conflict. Deciding finding (patient and partner): neither describes brief, conflict-driven shifts. This candidate is set aside without implying anything about her character.
The Screen and Its Limits
Her score on the Mood Disorder Questionnaire was positive (Hirschfeld et al., 2000). The questionnaire raised the question of bipolar disorder, but a screen does not establish a diagnosis; the partner's detailed account of a specific episode is the evidence that answers it. Bipolar II disorder is often first diagnosed as unipolar depression because patients seek help when depressed and do not recognize hypomania as a problem (Grande et al., 2016).
Risk Assessment
Whatever the final diagnosis, the current depressive episode requires a safety assessment. She denies suicidal thoughts today, but bipolar II disorder carries a substantial risk of suicide, particularly during depressive and mixed states (Grande et al., 2016). The assessment should ask about past attempts, current thoughts, access to means and protective factors, and it should be repeated at each visit while she is depressed. Her partner's involvement, with her consent, adds a second observer who can report changes.
Why the Ranking Matters for Treatment
The difference between the first two candidates is not academic. If she has recurrent major depressive disorder, an antidepressant is a reasonable first step. If she has bipolar II disorder, an antidepressant used alone may be less effective and, in some patients, may be associated with switching into hypomania or with more rapid cycling, so a mood stabilizer or another agent with evidence in bipolar depression would usually be considered first. The ranking therefore has direct consequences for the prescription she receives, which is why the paper does not settle for the diagnosis that the presenting complaint alone would suggest.
Information Still Wanted
To confirm bipolar II disorder: a second collateral account of the spring episode, from a friend or coworker; a timeline of mood, sleep and activity over the past five years; family history of bipolar disorder. To overturn it: evidence that the spring episode followed a stimulant, a new medication or a significant sleep disruption such as travel, or that it lasted less than four days. Until then, bipolar II disorder is the working diagnosis, and it should shape the choice of treatment, since an antidepressant alone can carry risk in bipolar disorder, and it should be revisited as soon as the additional history arrives.
References
American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). American Psychiatric Publishing.
Grande, I., Berk, M., Birmaher, B., & Vieta, E. (2016). Bipolar disorder. The Lancet, 387(10027), 1561-1572. https://doi.org/10.1016/S0140-6736(15)00241-X
Hirschfeld, R. M. A., Williams, J. B. W., Spitzer, R. L., Calabrese, J. R., Flynn, L., Keck, P. E., Jr., Lewis, L., McElroy, S. L., Post, R. M., Rapport, D. J., Russell, J. M., Sachs, G. S., & Zajecka, J. (2000). Development and validation of a screening instrument for bipolar spectrum disorder: The Mood Disorder Questionnaire. American Journal of Psychiatry, 157(11), 1873-1875. https://doi.org/10.1176/appi.ajp.157.11.1873
How this MN661 Unit 3 example is structured
Ranking is the organizing decision, and the paper states its basis at the top: fit with reported features first, then base rate. Every block uses the same three headings, so a reader comparing candidates can read straight across the page. The deciding finding for each is a single sentence with its source named, patient, partner or record. The Mood Disorder Questionnaire (Hirschfeld et al., 2000) appears once, described as a screen that raised the question rather than evidence that answered it. Personality disorder is handled with care: mood shifts lasting hours and set off by conflict would support it, and the case describes neither, so it is set aside without implying anything about her character. In the final paragraph, what would confirm the leading diagnosis is kept apart from what would overturn it, so the conclusion stays a working position.
Get an MN661 Unit 3 example written to your instructions
Some Unit 3 prompts supply the candidate list; others leave it open. Tell us which kind your MN661 section set, attach the case and rubric, and the first paper, free and back within 24-48h, ranks each possibility under an explicit rule and names the finding that removes every one it sets aside. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
MN661 Unit 3 questions, answered
How many diagnoses belong in a differential?
Enough to cover the plausible alternatives, usually four to six in a case like this. A list of twelve with a sentence each is weaker than five examined properly. Include at least one medical or substance-related cause where the case permits it, since those are the rule-outs graders notice when missing, and give every candidate a reason for its place.
Can collateral information outweigh what the patient reports?
It can supplement it, and for hypomania it often matters more. People frequently remember elevated periods as productive rather than unusual. The paper should present both accounts, say where they differ, and explain which bears more weight on the specific question. Collateral from a composite partner in a supplied case is evidence the prompt expects you to use.
Should the differential include treatment?
Only when the prompt requests it. This unit is about what the presentation is, and a treatment plan appended to the differential dilutes the argument. If the prompt does request next steps, keep them to further assessment, such as a mood chart or a collateral interview, rather than prescribing anything, and leave therapy selection for a later assignment.