Comparative Analysis of integrated primary care models versus Standard Care in chronic fatigue syndrome

Bjorn Olsen; I. Nilsson; L. Pedersen

doi:10.5281/zenodo.22813596

Abstract

Background: Chronic fatigue syndrome (ME/CFS) is a disabling illness most patients experience within general practice, where management ranges from unstructured standard care to structured, multidisciplinary integrated primary care pathways.

Objective: This review compares integrated primary care models against standard care for adults with ME/CFS across symptom severity, function, quality of life, and health-service utilisation.

Methods: We synthesized randomised controlled trials, Cochrane systematic reviews, guideline evidence syntheses, and comparative cohort studies of cognitive behavioural, graded exercise, pacing-based, and coordinated primary-care-delivered interventions.

Findings: Structured, function-focused interventions outperformed unstructured or specialist-medical-care-only management, with roughly 60% of patients receiving cognitive behavioural or graded exercise therapy meeting improvement thresholds versus 45% receiving specialist care alone; coordinated pathways also reduced low-yield repeat consultation, though a clinically important minority reported worsening with unmodified graded exercise.

Conclusions: Integrated primary care models are supported by a substantial, largely indirect, evidence base for better outcomes and more efficient service use than standard care, provided activity-based components are individualised rather than fixed.

Keywords: chronic fatigue syndrome; myalgic encephalomyelitis; integrated primary care; standard care; cognitive behavioural therapy

1. Introduction

Chronic fatigue syndrome, also termed myalgic encephalomyelitis (ME/CFS), is a disabling multisystem illness defined by profound fatigue lasting six months or longer, post-exertional malaise, unrefreshing sleep, and cognitive impairment not explained by another medical condition [1]. Case definitions have evolved since the 1994 Centers for Disease Control criteria, with the International Consensus Criteria placing post-exertional malaise at the diagnostic core rather than treating it as one symptom among several [2]. The 2015 Institute of Medicine report proposed a simplified case definition intended for non-specialist clinicians, since most patients with ME/CFS are never seen by a specialist service [3]. Population studies in England and Norway estimate prevalence at roughly 0.2-0.4% of adults, with a substantial gap between community prevalence and formal diagnosis, implying most affected patients are managed, or left unmanaged, within primary care [4,5].

Standard care, as delivered in most general practices, typically consists of symptomatic treatment and referral triage with no structured rehabilitative component, reflecting diagnostic uncertainty and the absence of a disease-modifying drug [6]. Integrated primary care models instead embed a structured, multidisciplinary pathway into general practice, combining case-finding, graded activity or exercise-based rehabilitation, cognitive-behavioural elements, and coordinated follow-up with a fixed point of contact [7]. The evidence for these components was built largely in specialist secondary-care trials, most prominently the PACE trial comparing cognitive behavioural therapy (CBT), graded exercise therapy (GET), adaptive pacing therapy, and specialist medical care alone [8]. Whether that effectiveness survives delivery through a primary care pathway rather than a hospital clinic is a distinct question with direct relevance where specialist services are scarce [9]. This review compares integrated primary care models against standard, unstructured primary care for adults with ME/CFS across symptom severity, function, quality of life, and health-service utilisation.

2. Methods

We synthesised randomised controlled trials, cohort studies, and systematic reviews addressing non-pharmacological management of ME/CFS in adults, restricting attention to studies reporting a primary-care-delivered intervention or outcomes generalisable to a primary care pathway. Search domains covered CBT, GET, pacing, coordinated-care models, and diagnostic-pathway literature, drawing on Cochrane reviews, guideline evidence syntheses, and the PACE trial and its secondary analyses [10,11,12]. Outcomes of interest were fatigue and function scores, quality of life, rates of clinically meaningful improvement, and health-service contact and cost. Because few trials randomise directly between an integrated pathway and standard care, we also drew on comparative cohort studies of specialist-linked primary care services and meta-analyses pooling CBT/GET effect sizes against usual-care arms, the closest available proxy for standard care [13,14]. Paediatric studies were included only where the delivery model was primary-care-relevant [15].

3. Diagnostic Criteria and the Rationale for Integrated Primary Care

Diagnostic delay is itself a modifiable determinant of outcome: patients recognised early and guided through a structured pathway avoid the deconditioning and diagnostic uncertainty that accumulate when fatigue is repeatedly re-investigated without a working diagnosis [16]. The IOM's simplified criteria were explicitly designed for use without specialist input, lowering the threshold for a general practitioner to start a structured pathway rather than defer to a distant clinic [3]. Survey data confirm that post-exertional malaise, rather than fatigue severity alone, is most strongly associated with disability and is often missed when history-taking does not directly ask about exacerbation after exertion [17].

Integrated models combine case-finding at first presentation with a defined pathway: structured assessment, education on energy management and pacing, a graded activity component titrated to tolerance, and scheduled follow-up with the same clinician [18]. The cognitive-behavioural rationale for the education and pacing components was articulated by Surawy and colleagues, who proposed that unhelpful beliefs about activity and symptom meaning perpetuate disability and are a legitimate target for a structured pathway [19]. The EUROMENE consensus frames this coordination, rather than any single component, as most consistently associated with better patient-reported experience [7].

4. Comparative Effectiveness on Symptom and Functional Outcomes

In the PACE trial, 641 patients were randomised to CBT, GET, adaptive pacing therapy, or specialist medical care alone; at 52 weeks CBT and GET produced significantly greater improvement in fatigue and function than specialist medical care alone, with roughly 60% of the CBT and GET groups meeting a threshold for clinically useful improvement against approximately 45% for specialist care alone [8]. Mediation analysis found reduced avoidance of activity and reduced fear of symptoms accounted for much of the treatment effect [20]. Earlier trials reported concordant effects: Sharpe and colleagues found good outcomes in roughly 70% of CBT patients against 19% with standard medical care [21], Deale and colleagues found similarly large gains for CBT over relaxation control [22], and Prins and colleagues confirmed CBT's advantage generalised across a

Pooled estimates are consistent. Malouff and colleagues' meta-analysis found a moderate-to-large aggregate effect of CBT on fatigue severity [14], and Castell and colleagues, pooling CBT and GET trials, reported comparable effect sizes for both relative to usual or waiting-list care [13]. The Cochrane review of exercise therapy concluded GET improves fatigue and function more than passive control, while flagging limited evidence on harms and severely affected patients [10]. Wearden and colleagues found graded exercise improved fatigue independent of concurrent fluoxetine or placebo assignment [24]. Núñez and colleagues found combined CBT and graded exercise produced quality-of-life gains sustained at twelve months [25], and Nijhof and colleagues' FITNET trial of internet-delivered CBT in adolescents produced recovery rates roughly double those of usual care [15]. Full recovery, however, remains rarer than symptomatic improvement: Knoop and colleagues found only a minority of CBT responders met strict recovery criteria despite normalised scores [26].

5. Health-Service Utilization, Cost, and Patient-Centered Outcomes

Integrated pathways also alter service use. Collin and Crawley's cohort study of specialist ME/CFS services found structured, coordinated pathways produced more consistent follow-up and fewer unplanned re-referrals than unstructured management, though outcomes varied substantially across services [9]. Bansal's general-practice survey found unexplained fatigue, absent a structured pathway, generates disproportionate repeat consultation and low-yield investigation [6]. Sabes-Figuera and colleagues found the largest economic burden of ME/CFS falls on patients and family caregivers rather than the formal health system, strengthening the case for interventions that shorten time to effective management [27].

Patient-reported experience complicates the picture: survey studies find a sizeable minority, particularly those with more restrictive post-exertional-malaise-centred definitions, report that graded exercise worsened symptoms [28,29]. NICE's 2021 update withdrew its blanket recommendation for GET and CBT as curative treatments, recommending individualised, symptom-titrated activity management instead, reframing the question from which intervention to how it is delivered and adjusted, precisely where integrated pathways are meant to differ from standard care [12]. Kingdon and colleagues documented ME/CFS disability comparable to or exceeding multiple sclerosis, evidence guideline bodies cite to justify resourcing structured pathways [30]. Smith and colleagues' NIH-commissioned review found CBT and GET had the strongest evidence base but flagged gaps for severely affected patients and real-world delivery settings [31], and Kim and colleagues' systematic review noted most positive trials were specialist-based rather than primary-care-embedded, calling for pragmatic trials of the latter [32].

6. Discussion

The evidence supports a conditional preference for integrated primary care models over unstructured standard care. Structured activity management, pacing education, and CBT-informed coping have a consistent evidence base for improving fatigue, function, and quality of life, replicated across specialist trial settings for three decades [8,21,22,23,14]. The open question is translation rather than mechanism: most strong trial evidence was generated in specialist clinics with trained therapists, and how much effect survives delivery through general practice with less specialised staff remains only partially tested [32,31].

Patient-experience data add an important caveat: a meaningful subgroup, disproportionately those with more severe post-exertional malaise, report harm rather than benefit from graded activity, a population an integrated pathway must identify and redirect toward pacing-first management rather than a fixed exercise prescription [17,28]. NICE's shift toward individualised, symptom-titrated management is consistent with what the integrated-care literature identifies as its central advantage: not a single superior therapy but the infrastructure to individualise and adjust management over time [12,7]. Service-use data reinforce that this infrastructure reduces the low-yield consultation pattern characteristic of unstructured standard care [6,9].

Table 2: Randomised trial evidence for structured, function-focused interventions against standard or control management [21,22,23,8].

Trial Comparison Duration Reported outcome

[21] CBT vs standard 12 Good outcome in ~70% medical care months vs 19% with standard care [22] CBT vs relaxation 6 months Significantly greater control improvement in functioning with CBT [23] CBT vs usual care, 14 CBT advantage multicentre months replicated across treatment sites [8] CBT/GET vs 52 weeks CBT and GET produced adaptive greater fatigue and pacing/specialist function gains care alone (PACE) The evidence base has real limits. Few trials randomise directly between an integrated pathway and standard care as defined here; most comparative evidence comes from specialist-versus-control trials and cohort comparisons, and outcome measurement varies enough across studies to complicate pooling [11,13]. Severely affected and paediatric populations remain underrepresented, and FITNET's internet-delivered model has not been widely replicated outside a single health system [15].

7. Conclusion

Integrated primary care models for chronic fatigue syndrome, built around early structured diagnosis, individualised activity management, and coordinated follow-up, are supported by a substantial though largely indirect evidence base showing better outcomes and more efficient service use than unstructured standard care [8,25,9,6]. That evidence base was built predominantly in specialist settings, and its translation into general-practice-embedded pathways, together with the need to individualise activity-based components to avoid harm in patients with pronounced post-exertional malaise, remain the central unresolved questions for wider adoption [12,28,32].