Key Facts

Motivational interviewing is one of the most widely studied and applied behavioural interventions in healthcare. It has a strong evidence base across multiple conditions including substance misuse, smoking cessation, medication adherence, weight management, and chronic disease self-management.

Epidemiology and Context

• MI is recommended in over 20 NICE guidelines across different clinical areas
• Brief motivational interventions (1-4 sessions) are the standard approach for hazardous/harmful alcohol use in primary care and Emergency Departments
• MI training is a core competency in postgraduate training for GPs, psychiatrists, and addiction specialists
• Stages of Change model (Prochaska & DiClemente, 1983): often used alongside MI — precontemplation, contemplation, preparation, action, maintenance, relapse

Theoretical Basis

• Self-determination theory: MI supports autonomy, competence, and relatedness — key psychological needs for sustained behaviour change
• Cognitive dissonance: MI creates discrepancy between current behaviour and personal values/goals, motivating change
• Self-perception theory: hearing oneself articulate reasons for change (change talk) strengthens commitment
• Reactance theory: directive, confrontational approaches increase resistance; MI avoids this by "rolling with resistance"

Pathophysiology/Mechanism of Action

• MI works through the language of change: the practitioner strategically evokes and reinforces change talk (patient statements favouring change)
• Research demonstrates that the proportion of change talk vs sustain talk in MI sessions predicts behavioural outcomes
• Empathic listening activates mirror neuron systems and builds therapeutic alliance
• MI reduces discord (resistance) in the therapeutic relationship by avoiding argumentation and supporting autonomy

Indications for Motivational Interviewing

• Substance misuse: alcohol, drugs, smoking — at any stage of change
• Chronic disease management: diabetes, hypertension, obesity, asthma adherence
• Lifestyle change: diet, exercise, sexual health
• Mental health: medication adherence, engagement with treatment
• Criminal justice: offending behaviour programmes
• Any situation where a patient is ambivalent about behaviour change

Assessment of Readiness to Change

• Precontemplation: not considering change; no perceived problem
• Contemplation: aware of problem; ambivalent; weighing pros and cons
• Preparation: intending to change; making plans
• Action: actively modifying behaviour
• Maintenance: sustained change; preventing relapse
• Relapse: return to previous behaviour — normalised as part of the change process

Core Processes of MI (Miller & Rollnick, 2013)

1. Engaging: establishing a working relationship; building rapport and trust
2. Focusing: developing and maintaining direction; agreeing on the target behaviour
3. Evoking: eliciting the patient's own motivations for change (change talk)
4. Planning: developing commitment to change and formulating a concrete plan

Red Flags / When MI May Not Be Appropriate

• Acute crisis: patient in immediate danger (overdose, psychosis, suicidality) — manage the emergency first
• Lack of capacity: patients who cannot engage in meaningful conversation (intoxication, delirium, severe cognitive impairment)
• When clear medical advice is needed: MI is not a substitute for giving unambiguous clinical information (e.g. "you need emergency surgery")
• Practitioner is not trained: poorly executed MI (especially "righting reflex" — telling the patient what to do) can be counterproductive

Assessment Tools Used Alongside MI

• Readiness to change rulers: 0-10 scale — "How ready are you to make this change?" followed by exploring responses
• Importance and confidence rulers: "On a scale of 0-10, how important is it for you to change? How confident are you that you could change?"
• Decisional balance: exploring pros and cons of change vs. status quo — structured exercise within MI framework
• AUDIT/AUDIT-C: screening for alcohol use disorders (used to identify patients who may benefit from MI)
• Stages of Change questionnaire: identifies current stage in the change cycle

Assessment of MI Fidelity

• MITI (Motivational Interviewing Treatment Integrity): gold standard for coding MI quality in research and training
  • Measures: empathy, MI spirit (partnership, autonomy, evocation, compassion)
  • Counts: reflections, questions (ratio of reflections to questions), MI-adherent behaviours (affirmations, seeking permission) vs MI-non-adherent behaviours (advising without permission, confronting)
• MISC (Motivational Interviewing Skill Code): more detailed coding system
• Training standards: MI competence typically requires 2-3 days initial training plus ongoing supervision and practice

Monitoring Outcomes

• Substance use measures: AUDIT, SADQ, urine drug screens, drinking diary
• Behavioural outcome measures: specific to target behaviour (e.g. HbA1c for diabetes, weight for obesity)
• Patient-reported outcomes: confidence in change, self-efficacy measures
• Session recordings: reviewed in supervision for MI fidelity

OARS — Core MI Skills

• Open questions: encourage patient to explore their experience
  • "What concerns you about your drinking?"
  • "How would you like things to be different?"
• Affirmations: recognise patient strengths, efforts, and values
  • "It took courage to come here today"
  • "You clearly care about your family's wellbeing"
• Reflective listening: the most fundamental MI skill; demonstrates understanding and encourages deeper exploration
  • Simple reflection: repeating or rephrasing what the patient said
  • Complex reflection: adding meaning, reflecting feeling, or continuing the paragraph (anticipating what the patient might say next)
  • Aim for reflection:question ratio of at least 2:1
• Summaries: collecting and linking what the patient has said; demonstrates careful listening and can strategically highlight change talk

Key MI Strategies

• Developing discrepancy: helping the patient see the gap between current behaviour and personal values/goals
  • "On one hand you enjoy drinking with friends, and on the other you're worried about your liver. What do you make of that?"
• Rolling with resistance (responding to sustain talk and discord):
  • Avoid arguing or confronting
  • Use reflections to acknowledge the patient's perspective
  • Emphasise personal autonomy: "It's entirely your decision"
• Supporting self-efficacy: build confidence in the patient's ability to change
  • "You've managed to cut down before — what worked for you then?"
• Eliciting change talk: ask evocative questions targeting desire, ability, reasons, need, commitment (DARN-C)
  • "What would be the best thing about making this change?"
  • "How might you go about it?"

Delivering MI in Practice

• Brief MI (5-15 minutes): adapted for time-limited settings (GP consultations, ED attendances); retains core spirit and OARS
• Extended MI (2-4 sessions, ~45 minutes each): motivational enhancement therapy (MET); used in specialist addiction services
• Group MI: adapted for group settings; effective in some contexts
• Telephone and digital MI: evidence for remote delivery; useful for accessibility

Training and Competence

• Initial training: typically 2-3 day workshop with role-play and feedback
• Ongoing supervision: essential for skill development and maintenance
• Coding and feedback: using MITI to assess and improve practice
• Integration with other approaches: MI is often combined with CBT, contingency management, or pharmacotherapy

Referral Criteria

• MI is a skill used across healthcare settings rather than a standalone referral pathway
• Brief MI: delivered by any trained healthcare professional (GP, nurse, pharmacist, ED doctor)
• Specialist MI/MET: addiction services, mental health teams, health psychology
• Training provision: Royal College of General Practitioners, various NHS trusts, Motivational Interviewing Network of Trainers (MINT)

Evidence of Effectiveness

• Alcohol use disorders: brief MI in primary care and ED reduces alcohol consumption; NNT ~8 for reduction to low-risk drinking (NICE CG115)
• UKATT trial (2005): motivational enhancement therapy (3 sessions) as effective as social behaviour and network therapy (8 sessions) — more cost-effective
• Project MATCH (1997): MET, CBT, and 12-step facilitation all effective; no significant matching effect
• Smoking cessation: MI increases quit attempts and abstinence rates (Lindson et al., Cochrane 2019)
• Drug misuse: modest but significant effects on reducing substance use (Smedslund et al., Cochrane 2011)
• Chronic disease: effective for medication adherence (OR ~1.5), diabetes self-management, weight loss

Limitations

• Effect sizes are modest: typically small to medium; MI is not a miracle cure
• Practitioner skill variation: effectiveness highly dependent on quality of MI delivery
• Less effective for: patients with no ambivalence (either strongly motivated or completely resistant), acute crises
• Evidence strongest for: brief interventions for alcohol, as adjunct to other treatments for drug misuse, and for engagement in treatment

Complications of Poor MI Practice

• "Righting reflex": telling the patient what to do → increases resistance
• Premature focus: pushing towards change before exploring ambivalence → discord
• Excessive use of closed questions: feels interrogative; reduces engagement
• Labelling: e.g. "you're an alcoholic" → increases resistance and shame
• Wrestling with resistance: arguing with the patient → entrenches status quo

MI Spirit and Principles Summary

Change Talk (DARN-CAT)

Key Landmark Studies