The relationship of Fennell phases to symptoms among patients with chronic fatigue syndrome.
Reynolds, Nadia L, Brown, Molly M, Jason, Leonard A · Evaluation & the health professions · 2009 · DOI
Quick Summary
This study looked at whether ME/CFS symptoms change over time in predictable phases. Researchers used a questionnaire called the Fennell Phase Inventory to sort 111 patients into three groups: those in crisis (worst symptoms), stabilization (middle ground), or resolution (improving). They found that patients in the crisis phase had more depression, anxiety, worse quality of life, and used less helpful coping strategies—like avoidance—compared to those improving or stable.
Why It Matters
Understanding whether ME/CFS progresses through distinct phases with characteristic symptom profiles could help patients recognize their disease trajectory and tailor interventions accordingly. Identifying that crisis-phase patients use maladaptive coping strategies suggests potential targets for psychological support to improve outcomes during severe periods.
Observed Findings
Crisis-phase patients scored significantly worse on depression measures than at least one other group.
Crisis-phase patients reported lower quality of life and poorer mental functioning compared to other phases.
Crisis-phase patients demonstrated lower self-efficacy and higher anxiety than comparison groups.
Patients in the resolution phase used more adaptive coping strategies than those in crisis or stabilization phases.
Patients in the crisis phase relied more heavily on maladaptive coping styles.
Inferred Conclusions
ME/CFS patients experience distinct phases characterized by different levels of psychological distress and physical functioning.
Coping strategy effectiveness varies by illness phase, with crisis-phase patients showing particular difficulty with adaptive coping.
Psychological interventions targeting coping skills may be especially beneficial during the crisis phase.
Remaining Questions
Do patients move through these phases in a predictable sequence, or can they cycle or regress between phases?
What factors determine progression from crisis to stabilization to resolution, and are any modifiable?
What This Study Does Not Prove
This study does not prove that the Fennell phases cause specific symptoms or coping patterns—only that they are associated. It cannot determine whether patients predictably move through phases in sequence, whether interventions can accelerate phase progression, or whether the FPI accurately captures all patients' illness trajectories. The cross-sectional snapshot cannot establish causation or temporal relationships.
Tags
Symptom:Cognitive DysfunctionPainFatigue
Method Flag:Weak Case DefinitionNo ControlsExploratory Only