Stress & Health Behavior
A high-yield tour of stress physiology (SAM/HPA axes, Selye's GAS, allostatic load) and its health consequences (Takotsubo cardiomyopathy, cortisol-driven immunosuppression), paired with the board-favorite behavior-change tools: the Transtheoretical Stages of Change matched to interventions, and motivational interviewing (OARS).
Stress: Two Axes, One Cost
Stress arises when perceived demands exceed a person's coping resources (Lazarus's transactional model). The body answers with a two-arm response: the fast sympathetic-adrenal-medullary (SAM) axis releases epinephrine (adrenal medulla) and norepinephrine (↑ HR, BP, glucose), and the slower hypothalamic-pituitary-adrenal (HPA) axis releases cortisol from the adrenal cortex (zona fasciculata). Hans Selye's General Adaptation Syndrome (GAS) models the stereotyped course: alarm → resistance → exhaustion. When stressors become chronic, repeated activation produces allostatic load — the cumulative "wear and tear" linking stress to hypertension, coronary disease, immune suppression, poor wound healing, and depression. On the boards, health behavior is tested through the Transtheoretical (Stages of Change) model: your job is to identify the patient's readiness and match the intervention — never to push a change the patient isn't prepared to make.
- Two axes: SAM (fast) → epinephrine/NE; HPA (slow) → cortisol
- Selye's GAS: Alarm (fight-or-flight) → Resistance (adaptation, sustained high cortisol) → Exhaustion (resources depleted, disease appears)
- Allostatic load = cumulative physiologic cost of chronic stress
- Chronic cortisol → immunosuppression (lymphopenia, ↓ NK-cell activity, but neutrophilia from demargination), impaired wound healing, ↑ infections, central obesity, HTN, hyperglycemia
- Chronic stress accelerates telomere shortening (cellular aging)
- Type A pattern (competitive, time-urgent, hostile) → ↑ coronary artery disease; hostility is the toxic component
- Acute catecholamine surge → Takotsubo (stress) cardiomyopathy: apical ballooning, mimics STEMI, normal coronaries, typically reversible
- Stages of Change: Precontemplation → Contemplation → Preparation → Action → Maintenance (± Relapse)
Vignette: A 68-year-old woman develops crushing substernal chest pain hours after her husband's funeral. ECG shows anterior ST-segment elevations and troponin is mildly elevated. Coronary angiography reveals no obstructive disease; left ventriculogram shows apical ballooning with a hyperdynamic base.
- Diagnosis: Takotsubo (stress / "broken-heart") cardiomyopathy — catecholamine-mediated myocardial stunning after intense emotional or physical stress; classically postmenopausal women.
- Next step: It is clinically indistinguishable from STEMI, so emergent coronary angiography is done first to exclude ACS; once obstructive CAD is ruled out, give supportive care (± guideline-directed heart-failure therapy if EF is reduced). The wall-motion abnormality is typically reversible over weeks.
- The giveaway: looks exactly like a STEMI, but normal coronaries + apical ballooning clinches it.
Stress-Related Disorders by Timing
| Disorder | Stressor | Timing | First-line management |
|---|---|---|---|
| Adjustment disorder | Ordinary life stressor (job loss, divorce) | Onset <3 mo of stressor; resolves <6 mo after it ends | Psychotherapy |
| Acute stress disorder | Life-threatening trauma | Symptoms last 3 days–1 month post-trauma | Trauma-focused CBT (avoid benzodiazepines) |
| PTSD | Life-threatening trauma | Symptoms >1 month | Trauma-focused psychotherapy + SSRI/SNRI (sertraline, paroxetine, venlafaxine) |
Coping & Motivational Interviewing
Coping styles are frequently contrasted. Problem-focused coping targets the stressor itself (make a plan, gather information, remove the source) and is adaptive when the situation is controllable. Emotion-focused coping manages the emotional reaction (reappraisal, seeking support, relaxation) and helps when the stressor cannot be changed. Maladaptive coping — denial, avoidance, substance use — predicts worse outcomes.
Motivational interviewing (MI) is the board-preferred approach for ambivalent patients. It is collaborative and patient-centered: express empathy, roll with resistance instead of arguing, develop discrepancy between current behavior and the patient's own goals, and support self-efficacy. The classic wrong answers are confrontation, moralizing, and fear/scare tactics — these raise resistance and rarely change behavior.
Stages of Change → Matched Intervention
| Stage | Patient's stance (buzzwords) | Best next step |
|---|---|---|
| Precontemplation | No intent; denies problem — "I don't have a problem" | Non-judgmental info; raise awareness |
| Contemplation | Ambivalent, considering within 6 mo — "I know I should, but…" | Motivational interviewing; weigh pros/cons |
| Preparation | Committed, plans to act within 1 mo — "I'll quit next week" | Set a quit date; make a concrete plan |
| Action | Actively changing (<6 mo) | Reinforce, support, problem-solve barriers |
| Maintenance | Sustained change (>6 mo) | Relapse prevention; reinforce coping |
| Relapse | Reverted to old behavior | Normalize; re-engage at current stage |
Vignette: A 52-year-old man with a 30-pack-year history says, "I know smoking is bad for me, and I've been thinking I really should stop one of these days — but honestly I'm not ready to set a date yet."
- Stage: Contemplation (ambivalent, no commitment or timeline).
- Best next step: Motivational interviewing — explore ambivalence, elicit his own reasons to change, develop discrepancy.
- Wrong answers: setting a quit date or prescribing varenicline (those fit Preparation/Action); lecturing or scare tactics (can increase resistance).
Contrast: if he asked, "I want to quit — what's the best way to start next week?" he is in Preparation, and the next step is to set a quit date and offer pharmacotherapy (NRT, bupropion, or varenicline).
OARS — the core communication skills of motivational interviewing:
- O — Open-ended questions (invite the patient to talk)
- A — Affirmations (recognize strengths and effort)
- R — Reflective listening (mirror back to show understanding)
- S — Summarizing (tie themes together, confirm the plan)
Use OARS to move an ambivalent (Contemplation-stage) patient toward change without triggering resistance — the opposite of confrontation.
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