CPR APPLICATIONS FOUNDATION · CHAPTER 17 · NORMAL
Normal Foundations of Psychiatry & Behavioral Science
Organize the chapter before drilling into individual CPR concepts.
Supplemental foundation map: this page orients the detailed CPR Applications for Chapter 17. It is not part of the canonical CPR object inventory.
Move through Chapter 17
Normal Foundations · You are here
Abnormal Foundations
Treatment Foundations
17.1 · SOURCE CPR FOUNDATION
Concept
Psychiatry is solved by symptom pattern, time course, impairment, and exclusion of better explanations. Step 1 is rarely asking whether a patient is simply “anxious” or “sad.” It is asking which domain is disrupted, how long it has been disrupted, and whether the syndrome is better explained by a medical illness, substance, or primary psychiatric disorder.
Pattern
Step 1 usually pivots on the dominant symptom cluster, duration, functional impairment, and safety. The same symptom can appear across many diagnoses, so the correct answer often depends on whether mood regulation, reality testing, trauma response, cognition, personality structure, or substance physiology is the primary problem.
Rule
- Name the domain first. Mood, anxiety, psychosis, cognition, personality, substance use, trauma, or somatic symptom pattern.
- Then anchor the time course. Acute, episodic, persistent, chronic, and trauma-linked patterns separate diagnoses.
- Then exclude medical or substance causes. Delirium, intoxication, withdrawal, endocrine disease, medications, and neurologic illness can mimic psychiatric disease.
Applications
- Sudden confusion after infection → delirium not primary psychosis
- Recurrent intrusive thoughts with preserved reality testing → OCD
- Flat affect avolition poor hygiene → negative symptoms
- Hyperalert avoids reminders after trauma → PTSD pattern
- Persistent social-communication differences with restricted or repetitive behaviors originating in early development → consider autism spectrum disorder; isolated behaviors are nonspecific
- Depression with a distinct prior episode of elevated or irritable mood, increased energy, and reduced need for sleep → evaluate for bipolar disorder rather than relying on sleep change alone screening
- Tip: Domain duration impairment and exclusion come before diagnosis
CPR APPLICATIONS · ACTIVE REASONING
Predict stress, sleep, and neural signaling
Build the causal chain from neurobiology to observable behavior. Distinguish a normal physiologic response from a disorder or medication effect. Select a response before checking the explanation. If scripting is unavailable, expand a worked answer. Responses are not stored or transmitted.
Reveal worked answer and transfer
Best answer: Reduced CRH and ACTH signaling. Cortisol feeds back on hypothalamic and pituitary signaling, tending to reduce CRH and ACTH in an intact axis.
Change one variable: If a patient is taking prolonged exogenous glucocorticoids, why may endogenous ACTH become suppressed?
Reveal worked answer and transfer
Best answer: Marked skeletal-muscle atonia apart from selected muscles. REM sleep features active brain physiology with brainstem-mediated reduction of most skeletal muscle tone.
Change one variable: What sleep disorder should be considered if REM-related skeletal muscle atonia is lost and a person acts out dreams?
Reveal worked answer and transfer
Best answer: Motor control through basal-ganglia circuits. The nigrostriatal pathway participates in motor control; impaired signaling can lead to parkinsonian motor findings.
Change one variable: How can dopamine D2 receptor blockade produce extrapyramidal adverse effects while treating psychosis?
Change the mechanism
Review the comparison without scripts
- Intact HPA negative feedback: Cortisol tends to suppress CRH and ACTH secretion.
- REM sleep physiology: Rapid eye movements and characteristic skeletal-muscle atonia accompany REM sleep.
- Nigrostriatal dopamine signaling: Supports basal-ganglia motor control; disruption can produce extrapyramidal signs.
Explain it back: For one decision, state the mechanism, a specific counterexample, and the finding that would change your conclusion.
Unscored educational practice; not psychometrically validated and not patient-specific medical advice.
How to use this foundation map
- Identify the organizing mechanism.
- Recognize the pattern.
- Restate the rule without looking.
- Test transfer with applications and question practice.
Pair CPR with the 5P Approach™ when solving cases and questions.