One-session treatment for specific phobia

1. Introduction

Version followed: Öst's original one-session treatment (OST; Öst, 1989) as later set out for adults and youth in the guidelines of Davis, Ollendick & Öst (2012), with the youth procedure as run in the Ollendick et al. trials and the UK ASPECT trial protocol (v5, 2019), which trains therapists in a study-specific OST protocol built on Davis et al. (2012). The 2012 book chapters themselves are not drawn on, so details below come from the open protocol, reviews and the developers' own published descriptions [uncertain where flagged].

OST is a short, intensive cognitive-behavioural treatment for a single specific phobia (for example animals, blood-injection-injury, enclosed spaces, flying, dental or pill-swallowing fears). It has two parts: a roughly 1-hour functional assessment, then one massed exposure session of up to about 3 hours. In that session the therapist takes the client up a fear hierarchy using in vivo exposure, participant modelling, reinforcement and cognitive challenge, and runs each exposure step as a behavioural experiment. Afterwards the client keeps practising self-exposure [source: Zlomke & Davis 2008 abstract; ASPECT protocol v2/v5; Öst 1989 as cited in both].

How change happens: the phobia is kept going by avoidance and by catastrophic predictions about the feared object or situation (for example, "the spider will run up my arm", "I will faint and die"). Graded but prolonged contact, held until fear clearly drops, lets fear habituate or extinguish. Exposure set up to test the specific predictions disconfirms them. Approach behaviour then replaces avoidance. Ollendick reports that change in beliefs partly mediates change in fear in his studies [source: Ollendick, Psychwire Q&A; Pucpr review summarising Öst 1989 and Zlomke & Davis 2008].

2. Framework

OST is a single therapy package, not a multi-phase programme. The developers describe the phases below. The session counts are those used in the trials [source: ASPECT protocol §8.2; Ollendick Q&A].

Phase	Goal	Format and length	Move on when
A. Functional (cognitive-behavioural) assessment	Map triggers, avoidance, safety behaviours, family accommodation, physical symptoms, onset and course. Elicit catastrophic cognitions and build a least-to-most fear hierarchy. Build rapport, give the rationale, correct misconceptions about exposure and explain what the treatment session will involve.	About 1 hour, with parents present for youth. Usually done the day before the treatment session (Ollendick's preferred two-day format: assessment one afternoon, treatment the next morning), which also gives time to obtain matching stimuli. A same-day format is possible but harder for young children and those with ADHD or autism.	The hierarchy and the target catastrophic beliefs are specified, suitable stimuli are arranged, safety screening is done (allergy, asthma, cardiac, fainting history), and the client consents to the session.
B. Massed exposure session	Climb as far up the hierarchy as possible in one sitting, testing each catastrophic belief through behavioural experiments with modelling and reinforcement.	One session of up to about 3 hours. Ollendick divides youth sessions into three segments, each with a different exemplar of the stimulus (for example three spiders, or dogs of different size and activity). A 2-hour cap was used in one adult spider variant.	Within the session, move to the next step when fear at the current step has fallen by at least 50% [source: ASPECT]. The session ends when the top of the hierarchy is reached, or when the time limit is reached [source: Wannemueller et al. 2016 for adult individual OST].
C. Maintenance (self-directed exposure)	Consolidate gains and prevent relapse. The client keeps approaching the stimulus, refuses to avoid or escape, and deliberately enters the feared situation regularly (ASPECT wording: daily) over the following weeks.	Home practice. In standard child OST, parents are asked to arrange exposure without a prescribed programme. In the parent-augmented version there is a prescribed 4-week programme. A brief follow-up call (for example 30 minutes) was used in an adult IAPT series.	Follow-up at about 1 month (trials) to check maintenance; consider standard CBT if fear persists.

Delivery: individual is standard. Small-group OST (groups of 3–4 and 7–8) has been run for spider phobia by Öst, and large-group variants exist, but individual OST outperformed group OST on behavioural approach tests [source: Wannemueller et al. 2018; Pucpr review]. Ollendick suggests a stepped-care place for OST: bibliotherapy first, then OST, then standard CBT or medication [source: Ollendick Q&A].

3. Guiding principles

[source: ASPECT protocol §8.2; Ollendick Q&A; Zlomke & Davis 2008 abstract; items marked otherwise are flagged]

Graded, not flooding. Exposure is massed into one sitting but always climbs a hierarchy step by step. Ollendick says plainly it is "NOT flooding". In practice, never jump to the top step.
Nothing without consent. "Nothing will ever happen without the child's permission" (ASPECT). In practice, ask before each new step and negotiate it. The client keeps control of whether to proceed.
No surprises or tricks. In practice, tell the client exactly what will happen next (for example where the animal will be and what it might do) before it happens. [uncertain: this is a widely described OST rule attributed to Öst and Davis et al., but the wording is not confirmed]
Exposure as experiment. Each step is set up to test a specific catastrophic prediction from the assessment. In practice, before a step, name what the client fears will happen. After it, ask what actually happened.
Stay until fear drops. Remain at each step until fear has fallen by at least 50%. In practice, do not move on, or stop, at peak fear.
Therapist goes first, then fades. Participant modelling means you demonstrate, then guide physically (hand, then arm), then withdraw help. In practice, the client should finish each step unaided.
Active encouragement against avoidance. The therapist actively encourages task completion and does not let avoidance stand. In practice, be warm but persistent, and offer a smaller step rather than giving up.
Reinforce every approach. Use specific praise, encouragement and (for children) concrete rewards. In practice, praise effort and each completed step immediately.
Match the stimulus to the fear. The functional assessment decides which exemplars are brought in and how they behave. In practice, if the client fears jumping dogs, the session must end with a lively dog, not only a calm one.
Vary the stimuli. Use several exemplars across the session. In practice, plan about three different stimuli or contexts.
Drop safety behaviours. Avoidance and safety behaviours keep the phobia going. In practice, identify them in the assessment and fade them during the session.
Push for the top within the session. The massed format is meant to get as far as possible in one sitting. In practice, use the full time available and plan more steps than you think you need [synthesis].
Transfer control. The client, or the parent of a child, should leave able to run exposures without you. In practice, rehearse self-directed exposure near the end and agree a home plan.
Safety first. Screen for medical risks and do not present stimuli that cannot be made safe (for example stinging insects with allergy risk). In practice, use simulation, video, imagery or VR instead, or refer on [source: ASPECT].

4. Intervention inventory

Unless tagged otherwise, steps are paraphrased from the ASPECT protocol (§8.2), Ollendick's published Q&A, and the Zlomke & Davis (2008) and Davis et al. (2009) abstracts. All example language is illustrative unless quoted.

4.1 Functional (cognitive-behavioural) assessment

Purpose: Specify what exactly is feared, what keeps the phobia going, and what the session must contain. Done before every OST.
Steps: (1) Take onset and course, and confirm the diagnosis is one specific phobia that is suitable for OST. (2) Map antecedents (which features make it worse: size, speed, closeness, unpredictability, being trapped). (3) Map consequences: avoidance, escape, safety behaviours (checking rooms, wearing gloves, someone else always removing the spider) and family accommodation. (4) Record physical symptoms. In blood-injection-injury fear, ask specifically about past fainting or near-fainting. (5) Elicit catastrophic cognitions (4.2). (6) Build the hierarchy (4.3). (7) Screen for safety: allergy, asthma, cardiac problems, fainting history and medical conditions that exposure could worsen. (8) Give the rationale (4.4). (9) Agree the date and length of the session and which stimuli you will obtain.
Example language (illustrative): "Walk me through the last time you saw a dog in the street — what did you notice first, what went through your mind, and what did you do?"
Watch for: Hidden safety behaviours and accommodation by others. A second phobia or broader anxiety disorder that may need its own plan. A parent who shares the phobia (Ollendick estimates 5–10% of cases), in which case treat the parent first if severe or involve a non-phobic adult.

4.2 Eliciting catastrophic beliefs

Purpose: Identify the specific predictions that exposure will test. Belief change is treated as a key mechanism.
Steps: (1) For each hierarchy situation, ask what the client thinks will happen if they stay. ASPECT gives the stem "what do you think may happen if…". (2) Follow the chain down to the worst outcome (for example the spider crawls up my sleeve, then I lose control and go mad). (3) Write the predictions down in the client's own words. (4) Optionally rate conviction (0–100%) so you can re-rate after the experiment [uncertain: conviction ratings are commonly used in OST research, but the rating format is not confirmed]. (5) Note predictions about one's own reactions (fainting, panic, vomiting, screaming) as well as about the object.
Example language (illustrative): "If you stayed by the jar and the spider moved, what do you think would happen next? And after that?"
Watch for: Vague answers ("it would be awful"). Keep asking until the prediction is concrete and testable. With young children, use simple language, drawings or toys.

4.3 Fear hierarchy construction

Purpose: Sequence the session from least to most frightening.
Steps: (1) List 8–15 situations varying in distance, contact, movement, size and control [synthesis on number]. (2) Have the client rate fear for each and order them. (3) Make sure the top steps go beyond everyday needs (for example a spider on the hand, a lively dog jumping up, a closed small room with the door shut), so that ordinary life feels easy afterwards [synthesis]. (4) Add intermediate steps where there is a large jump in fear. (5) Link each step to the prediction it tests.
Example language (illustrative): "On a 0–100 scale, how scary is a spider in a closed jar on the far side of the room? On the table in front of you? Out of the jar on the table?"
Watch for: Gaps between steps. In session you may need to invent bridging steps on the spot, so keep the list flexible.

4.4 Treatment rationale and psychoeducation

Purpose: Explain the avoidance-fear cycle, set expectations (intensive, graded, consent-based), correct misconceptions about exposure, and provide accurate information about the feared stimulus.
Steps: (1) Draw the cycle: trigger, fear, avoidance, short-term relief, and stronger fear next time. (2) Explain that staying in the situation until fear falls, and finding out what really happens, breaks the cycle. (3) Explain that fear will rise during the session, that this is expected and safe, and that it comes down with time. (4) State the consent rule: no step without agreement, and nothing sprung on them. (5) Explain that it is one long session and why (momentum, generalisation). (6) Give factual information about the object (for example how spiders or dogs behave and how to predict and control their behaviour). One adult spider variant used a 20-minute film on spider myths [source: Wannemueller et al. 2016]. For blood-injection-injury fear, explain the faint mechanism (4.12).
Example language (illustrative): "Each time you avoid dogs, you feel better for a moment, but your brain learns that dogs really are dangerous. Tomorrow we'll go step by step, and I'll never do anything you haven't agreed to."
Watch for: A belief that therapy means being thrown in at the deep end. Correct it explicitly.

4.5 Stimulus selection and preparation

Purpose: Have the right exemplars available so the session can reach the top of the hierarchy and generalise.
Steps: (1) Choose stimuli that match the assessed fear features. For dogs, vary size, activity level and breed. (2) Plan about three different exemplars or contexts across the session. (3) Where the real stimulus cannot be brought in, use outings (for example gardens, airports), video clips, or VR. (4) Check the stimulus is safe, and for animals that it is calm, healthy, handled by a competent owner and treated humanely [synthesis on animal welfare]. (5) Have containment equipment ready (jars, cards, leads).
Example language (illustrative): "Tomorrow we'll have three spiders: a small slow one, a medium one, and a bigger, faster one like the one in your bathroom."
Watch for: Ending only with "easy" exemplars. Generalisation needs the realistic, feared version.

4.6 Behavioural avoidance test (BAT), pre and post

Purpose: Measure how far the client can approach the stimulus before and after treatment. It gives both of you concrete evidence of change.
Steps: (1) Set a standard series of approach steps with the real stimulus. (2) Ask the client to go as far as they are willing, with no pressure. (3) Record the last step completed and peak fear. (4) Repeat the same test after the session and at follow-up. BATs were the main behavioural outcome in OST trials [source: Pucpr review; Ollendick Q&A, 88% completing a previously impossible BAT]. Whether the BAT sits inside the assessment hour in clinical (non-research) use is not specified in the sources [uncertain].
Example language (illustrative): "This isn't treatment yet — I just want to see how close you can comfortably get today. Stop whenever you want."
Watch for: Do not let the pre-treatment BAT turn into unplanned exposure the client did not agree to.

4.7 Graded, prolonged in vivo exposure

Purpose: The core procedure. Repeated, focused, prolonged contact up the hierarchy until fear habituates and predictions are disconfirmed.
Steps: (1) Start at the lowest agreed step. (2) Get a fear rating (0–100, or a simple fear thermometer for children) [synthesis on scale choice]. (3) Have the client stay, focused on the stimulus, without safety behaviours. (4) Take ratings every minute or two. (5) When fear has fallen by at least 50%, praise, debrief, and propose the next step. (6) Repeat up the hierarchy, introducing new exemplars across the session's segments. (7) Near the top, have the client do the steps alone, in different positions, and with the stimulus moving unpredictably. (8) Stop at the top of the hierarchy, or when the time cap (about 3 hours) is reached at a point where fear has fallen.
Example language (illustrative): "Your fear was 80 when we started and it's 35 now. That's what we were waiting for. Ready to try having the jar open?"
Watch for: Fear not falling (look for subtle safety behaviours such as averting gaze, holding breath or mental distraction). Moving on at peak fear. Pace that is too slow to reach the top in time.

4.8 Behavioural experiments (cognitive challenge through exposure)

Purpose: Test catastrophic beliefs directly in the presence of the stimulus, rather than through extended Socratic dialogue. Ollendick describes this as testing beliefs during exposure, and for young children calls the result a "thought-ectomy" (replacing a distorted thought with a more adaptive one) [source: Ollendick Q&A].
Steps: (1) Before a step, state the prediction ("the spider will run up my arm"). (2) Design the step so the prediction can be checked, for example the client moves a finger towards the spider and watches what it does. (3) Ask the client to say what they expect, then carry it out. (4) Ask what happened and whether it fits the prediction. (5) Draw the conclusion together, and re-rate conviction if you use ratings. (6) Go on to the next prediction or a harder test.
Example language (illustrative): "You said that if you brought your finger close, it would race up your hand. Let's find out. What did it do? So what does that tell you about what spiders do when something big comes near?"
Watch for: Predictions that are partly confirmed (for example a dog does jump up). Turn this into learning that the client can cope (the dog jumped, nothing bad happened, and you managed it), and plan that experiment deliberately.

4.9 Participant modelling

Purpose: Show safe approach behaviour, then guide the client into it and fade your support.
Steps: (1) Do the step yourself first while the client watches, describing what you are doing and what the animal or object is doing. (2) Invite the client to do it with physical support (your hand over theirs, or holding their hand). (3) Fade the support: from hand to arm, to standing beside them, to instructions only. (4) Have the client repeat the step alone. In later stages, therapist support is limited to instructions and presence [source: ASPECT; Wannemueller et al. 2016].
Example language (illustrative): "Watch me first — I'll put the cup over it and slide the card under. Now let's do it together, my hand on yours. This time I'll just keep my hand on your arm."
Watch for: The therapist's presence or touch becoming a safety signal. Make sure each step ends with unaided performance.

4.10 Reinforcement

Purpose: Strengthen approach behaviour and motivation.
Steps: (1) Give immediate, specific praise for each approach and each completed step. (2) Use encouragement and physical warmth where appropriate (ASPECT lists pats on the back). (3) For children, consider tangible rewards for steps and a larger reward at the end. The ASD adaptation used both. (4) Teach parents to praise approach rather than reassure avoidance.
Example language (illustrative): "You held the cup for a full two minutes even though your fear was high — that's exactly the brave thing we needed."
Watch for: Rewards that become bribes to skip steps. Tie rewards to approach behaviour, not to ending the session.

4.11 Skills training: handling the stimulus

Purpose: Give the client practical competence (catching a spider with a cup and card, approaching and greeting a dog, operating the lift) so that predictability and control replace avoidance. Psychoeducation and skills training are listed OST components, and learning to predict and control the animal's behaviour is a stated aim [source: Davis et al. 2009 abstract; Wannemueller et al. 2016].
Steps: (1) Teach the skill by modelling (4.9). (2) Have the client practise it at gradually harder hierarchy steps. (3) Have them use it independently at the end of the session and at home.
Example language (illustrative): "Let me show you how to let a dog sniff the back of your hand before you stroke it."
Watch for: Skills used as avoidance (always trapping the spider instantly). Also build tolerance of the uncontrolled stimulus.

4.12 Applied tension for blood-injection-injury (BII) phobia

Purpose: Counteract the two-phase (vasovagal) response — a brief rise in heart rate and blood pressure followed by a sudden drop that can cause fainting — so that exposure can proceed safely. Developed by Öst & Sterner (1987) and combined with OST-format exposure in BII work (for example Öst, Hellström & Kaver, 1992, comparing one versus five sessions).
Steps (as adapted by Wannemueller et al. 2018): (1) Explain the difference between sympathetic signs (palpitations, sweating) and early vasovagal signs (dizziness, nausea, blurred vision, light-headedness). (2) Demonstrate tensing the large muscles of the legs and buttocks for about 15–20 seconds, release for about 20 seconds without going into full relaxation, then add tension in the arms and hands. (3) Practise several cycles until the client can produce a feeling of warmth or pressure in the head. (4) During exposure (pictures, then video, then handling equipment, then a real or simulated procedure), cue the client to apply tension at the first vasovagal signs. Exact repetition counts and home-practice schedules from Öst & Sterner (1987) are not confirmed [uncertain].
Example language (illustrative): "The moment you notice that light-headed, drained feeling, tense your legs and arms like we practised and hold it until the warmth comes back into your face."
Watch for: Fainting risk is highest early (fainting occurred during psychoeducational video in one study). Keep the client seated or reclining, have medical support available for high-risk clients, and avoid graphic material before the skill is learned. Do not teach relaxation as the main coping skill for fainters, because it can lower blood pressure further [synthesis, consistent with the applied-tension rationale].

4.13 Substitute stimuli: imagery, video, outings, virtual reality

Purpose: Exposure when the real stimulus is unavailable or unsafe (stinging insects, storms, wild animals, flying), or as early hierarchy steps.
Steps: (1) Use video clips, pictures, imagery or VR for the lower steps, or as the whole exposure when in vivo is impossible. (2) Run them with the same rules: predictions, staying until fear drops, and modelling where feasible. (3) Move to real-life contact as soon as it can be arranged, for example field trips to gardens or airports. Ollendick's group ran a VR version of OST for children with dog phobia [source: Ollendick Q&A; ASPECT]. In adults, VR exposure gave similar symptom improvement but smaller behavioural approach gains than in vivo OST [source: Pucpr review citing Miloff et al. 2019].
Example language (illustrative): "We can't safely bring a wasp in, so we'll start with close-up video and then go to the garden where they're feeding."
Watch for: Gains that do not transfer to the real stimulus. Plan real-life self-exposure.

4.14 Breathing and relaxation for acute distress (protocol add-on)

Purpose: Short-term down-regulation when distress threatens to stop the session. ASPECT lists relaxation and breathing techniques under managing high distress. A Brazilian review excluded studies combining OST with breathing or relaxation as departures from the pure Öst model [source: ASPECT; Pucpr review]. Treat this as an adjunct, not a core OST component [uncertain].
Steps: (1) Pause the step without removing the stimulus where possible. (2) Lead a few slow breaths. (3) Re-rate fear. (4) Return to the step or a slightly easier one.
Example language (illustrative): "Let's keep the jar where it is and slow your breathing for a moment. In for four, out for six."
Watch for: Breathing used as a safety behaviour that blocks learning. Fade it.

4.15 Parent involvement and transfer of control (youth)

Purpose: Help gains carry over at home. Standard child OST does not involve parents in the session itself. The parent-augmented variant tested by Ollendick et al. (2015) did not outperform standard OST at follow-up.
Steps (parent-augmented variant): (1) Parents watch the first part of the session, from behind a one-way mirror or in the room, with a clinician explaining what the therapist is doing. (2) Parents then join and practise the therapist's modelling and praise. (3) In the final part, control is transferred from therapist to parent, who leads steps with feedback. (4) Teach parents to reinforce approach, use a visual schedule if needed, and stop accommodation. (5) Agree a prescribed 4-week home programme [source: Ollendick Q&A; OAR summary of ASD study].
Example language (illustrative): "For this last part, you'll be the coach. Ask her what she thinks will happen, let her decide when she's ready, and praise every step."
Watch for: Parental reassurance or rescuing. A parent with the same phobia: use another adult.

4.16 Maintenance programme and relapse prevention

Purpose: Consolidate learning and prevent return of fear. The single session is not the whole treatment.
Steps: (1) Near the end of the session, agree specific self-exposure tasks for the coming weeks. ASPECT names refusing to avoid or escape the stimulus and deliberately entering the feared situation every day. (2) Pick tasks at the level reached in session, with varied stimuli and contexts. (3) Explain that a jump in fear later is normal and is a cue for more exposure, not a sign of failure. (4) Have the client predict obstacles and plan for them. (5) For children, agree who will arrange the opportunities. In standard OST, parents arrange exposures without a prescribed programme [source: ASPECT; Ollendick Q&A].
Example language (illustrative): "Over the next month, any time you see a spider, your job is to go towards it, not away. Aim to look for one deliberately every day."
Watch for: Lapses into old avoidance. Check at follow-up.

4.17 Follow-up contact

Purpose: Review maintenance and decide whether more help is needed.
Steps: (1) Schedule follow-up at about 1 month, by phone or in clinic. The adult IAPT case series used a 30-minute phone call. The ASD study used weekly calls (standard) or weekly 45–60-minute clinic sessions (augmented) for 4 weeks. (2) Repeat measures and, ideally, a BAT. (3) Troubleshoot home practice. (4) If fear persists, offer a further session or multi-session CBT [source: Hiermeier & Mofrad 2020 abstract; OAR summary; Ollendick Q&A].
Example language (illustrative): "What did you do with dogs this month? Where did you hold back?"
Watch for: Partial responders who need stepped-up care.

4.18 Adaptations for young children

Purpose: Fit the session to children aged about 7–11 (ASPECT) and younger. OST has been reported with a 4-year-old with dog phobia [source: Pucpr review citing Kershaw et al. 2017].
Steps: Use a slower pace, more breaks, play, and "hero figure" imagery (the child imagines a favourite hero facing the stimulus). Allow a parent present if the child wants it, and use a comfort object. Use simple fear ratings and concrete rewards. Ollendick prefers splitting the assessment and treatment across two days [source: ASPECT; Ollendick Q&A].
Example language (illustrative): "What would Spider-Man do if he saw a dog? Shall we try doing it his way?"
Watch for: Fatigue in the third hour. Shorten segments and use breaks rather than ending early.

4.19 Adaptations for autistic youth and developmental disabilities

Purpose: Make OST accessible while keeping its core components.
Steps (Ollendick's ASD feasibility trial): Use visual aids and a visual schedule of steps. Build in the child's special interests. Plan for sensory sensitivities (noise, textures, smells of animals) and for restricted or repetitive behaviours. Give extra rewards per step plus a bigger end reward. Use parent coaching and transfer of control (4.15), and 4 weekly follow-up contacts. ASPECT adds more breaks, a trusted adult, comfort objects or home-based delivery [source: OAR summary; ASPECT]. A manual for ASD was planned. The final adapted manual is not drawn on here [uncertain].
Example language (illustrative): "Here's our picture list: dog photo, dog video, dog in the next room… we'll tick each one off."
Watch for: Distress that is sensory rather than phobic. Separate the two in assessment.

4.20 Group OST (format variant)

Purpose: Treat several clients with the same phobia at once (Öst 1996; Öst, Ferebee & Furmark 1997). Smaller groups (3–4) trended better than larger ones (7–8), and individual OST gave larger behavioural gains [source: Wannemueller et al. 2016, 2018; Pucpr review].
Steps: Use the same rationale, hierarchy and modelling, with participants taking turns and modelling for each other. In large-group BII variants, applied tension and breathing were taught before graded picture, video and live blood-draw exposure, with medical staff present.
Watch for: Less individual matching of steps to each person's predictions. Prefer individual OST where possible [synthesis].

5. Handling problems

Sourced guidance is tagged. Everything else is [synthesis] drawn from general exposure-therapy practice, consistent with the OST principles above.

Safety, consent and contraindications (before the session). Get informed consent to an intensive session, including that fear will rise. Screen for severe allergies (for example to stinging insects or animal dander), asthma, cardiac problems, seizure disorders and fainting history. Don't present stimuli that cannot be made safe. Use simulation instead, or exclude or refer. Consider whether OST is the right first-line option when another problem takes priority (for example psychosis assessment, an eating disorder, or self-harm). Expected adverse events include fainting in BII phobia and flare-ups of asthma, eczema or gastritis. Record any that occur [source: ASPECT]. In services, a second clinician may be needed for safety [source: ASPECT]. OST is designed for one circumscribed phobia. Complex, multiply comorbid presentations are less well studied [source: Pucpr review]. Treat the phobia with OST while other problems continue in usual care, or choose standard CBT [source: ASPECT; synthesis].

Client refuses the next step (stuck). Do not insist or trick. (1) Acknowledge the fear and remind them of the consent rule. (2) Ask what they predict will happen at this step and turn it into an experiment. (3) Model the step again yourself. (4) Make a smaller bridging step (more distance, less movement, a gloved hand first, a shorter duration). (5) Offer more physical guidance, then fade it. (6) Praise any approach. Persistent active encouragement is part of the therapist's role [source: Pucpr review; ASPECT for negotiated steps; specific tactics are synthesis].

Fear will not come down. Check for hidden safety behaviours (looking away, distraction, holding breath, tensing to flee) and for a prediction that has not been tested yet. Stay longer at the current step, or go back one step until fear falls. Avoid ending at peak fear. If time runs out, end on a step where fear has fallen and set it as the first home task [synthesis].

Overwhelm or panic. Pause the step, but keep the stimulus present at a tolerable distance. Use brief breathing if needed (an ASPECT-listed adjunct). Re-rate fear, then resume at a lower step. Explain afterwards that panic passed without the predicted catastrophe, which is itself disconfirming evidence [source: ASPECT for breathing; rest synthesis].

Fainting or near-fainting (BII). Teach applied tension before any blood or needle stimuli. Keep the client seated or lying down. Watch for pallor, sweating, yawning and light-headedness. If the client faints, lay them flat with legs raised, let them recover, then continue at a lower step once they are stable. Have medical support available for high-risk clients [source: Wannemueller et al. 2018; ASPECT; first-aid steps are synthesis].

Crying or protesting child. Expect it. Keep a calm, warm, matter-of-fact tone. Offer choices within the step (which hand, how long), use a parent or comfort object if agreed, use hero imagery and rewards, and take breaks rather than stopping. Never physically force contact [source: ASPECT for adaptations and permission; rest synthesis].

Rupture: client feels pushed or tricked. Stop and name it. Restate the consent rule, apologise if a step went beyond what was agreed, and re-negotiate the next step together. The client's trust that nothing will be sprung on them is what makes intensive exposure tolerable [synthesis].

Parent accommodation, or a parent with the same phobia. In assessment, identify how family members remove or avoid the stimulus for the child. Coach parents to stop this and praise approach (4.15). If a parent shares the phobia, Ollendick's team treats the parent first if it is severe, or uses a non-phobic parent, grandparent or older sibling [source: Ollendick Q&A].

Non-adherence to maintenance. Make home tasks specific (what, where, how often) and built into daily routines. Anticipate barriers. For children, assign an adult to arrange opportunities. Check at a short follow-up call. Lapses mean more exposure, not failure. If the client is avoiding again at follow-up, offer a booster session [source: ASPECT for daily deliberate exposure; Ollendick Q&A; specifics synthesis].

Stimulus unavailable or unpredictable on the day. Have a backup (another exemplar, video, a field trip). Animals can be sleepy, aggressive or ill: stop if an animal is distressed or dangerous, and protect animal welfare [source: Ollendick Q&A for alternatives; welfare synthesis].

Multiple phobias. Target the primary phobia in the session. Repeat OST, or use standard CBT, for the others. Generalisation to unrelated phobias should not be assumed [uncertain: trials treated a primary phobia; sources did not specify handling of secondary phobias].

Partial or non-response. Move up the stepped-care sequence: a further session or standard multi-session CBT, and treat comorbid conditions [source: Ollendick Q&A for stepped care; rest synthesis].

Therapist discomfort with intense distress. Therapists' negative beliefs about exposure lead to over-cautious delivery (stopping early, excessive reassurance). Use supervision, fidelity rating (the OST Rating Scale, 13 items, used in ASPECT supervision) and role-play before first cases [source: ASPECT for therapist attitudes self-assessment and OST-RS; rest synthesis]. The OST-RS is not reproduced here.

Sources

Sources:

Further reading (not drawn on): books and papers cited [uncertain for details attributed to them]:

Öst, L.-G. (1989). One-session treatment for specific phobias. Behaviour Research and Therapy, 27, 1–7.
Öst, L.-G., & Sterner, U. (1987). Applied tension: a specific behavioral method for treatment of blood phobia. Behaviour Research and Therapy, 25, 25–29.
Öst, L.-G., Hellström, K., & Kåver, A. (1992). One versus five sessions of exposure in the treatment of injection phobia. Behavior Therapy, 23, 263–282.
Davis, T. E., III, Ollendick, T. H., & Öst, L.-G. (Eds.) (2012). Intensive One-Session Treatment of Specific Phobias. Springer (including Öst's chapter on principles and procedures with adults).
Davis, T. E., III, Ollendick, T. H., & Öst, L.-G. (2009). Intensive treatment of specific phobias in children and adolescents. Cognitive and Behavioral Practice, 16, 294–303.
Zlomke, K., & Davis, T. E., III (2008). One-session treatment of specific phobias: a detailed description and review of treatment efficacy. Behavior Therapy, 39, 207–223.
Ollendick, T. H., et al. (2009). One-session treatment of specific phobias in youth: a randomized clinical trial in the United States and Sweden. Journal of Consulting and Clinical Psychology, 77, 504–516.
Ollendick, T. H., et al. (2015). Comparison of one-session treatment and parent-augmented one-session treatment. (As cited in ASPECT.)

Not drawn on: PMC full texts, Springer book pages, Europe PMC.

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