Tag: 2002

Recognising chronic fatigue is key to improving outcomes

Comment in: Caring for patients with chronic fatigue syndrome. Conclusions in CMO’s report are shaped by anecdote not evidence. [BMJ. 2002]

 

The government has finally issued its long awaited report on the management of chronic fatigue syndrome (also known as myalgic encephalomyelitis, or “ME”), after delaying publication earlier this month because several committee members resigned (5 January, p 7).

The report says that health professionals should recognise the condition as a chronic illness and that early recognition is key to improving outcomes.

Speaking at the launch, chief medical officer Professor Liam Donaldson acknowledged that the three years spent drawing up the report had been “enormously difficult, complex, and at some times controversial.”

“I’ve received a large amount of correspondence about this,” he said, admitting, “I’m a little surprised we have been able to get such a comprehensive and valuable report.”

You can read the rest of this article here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1122065/

 

Source: Eaton L. Recognising chronic fatigue is key to improving outcomes. BMJ. 2002 Jan 19;324(7330):131. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1122065/ (Full article)

 

Caring for patients with chronic fatigue syndrome. Conclusions in CMO’s report are shaped by anecdote not evidence

Comment on: Recognising chronic fatigue is key to improving outcomes. [BMJ. 2002]

 

In 1998, the chief medical officer of England and Wales commissioned a working group to advise on best practice guidelines to improve the quality of care and treatment for people with chronic fatigue syndrome/myalgic encephalomyelitis. Now issued, the group’s report reflects the good efforts of the scholars, practitioners, patients, and advocates who joined to address this complex matter.1

Given the controversies surrounding chronic fatigue syndrome, it is not surprising that the report admits to broad domains of disagreement among its members. If anything, it is remarkable that most of the original group weathered the undertaking, as there were resignations both among patients who deemed the evolving product insufficiently sympathetic and among academic practitioners who chafed at recommendations untempered by data.

The report identifies the sentinel issues that concern patients and practitioners alike: how one makes the diagnosis of chronic fatigue syndrome; the treatments to consider; and research that remains to be done. Unfortunately, despite more than 2000 relevant papers indexed on PubMed since chronic fatigue syndrome was first named in 1987, the group’s conclusions appear more shaped by anecdote than by evidence. In particular, major systematic reviews, including the recent one by Whiting et al, are not cited and do not seem to have significantly informed the guidelines.

You can read the rest of this comment here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1122056/

 

Source: Straus SE. Caring for patients with chronic fatigue syndrome. Conclusions in CMO’s report are shaped by anecdote not evidence. BMJ. 2002 Jan 19;324(7330):124-5. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1122056/ (Full article)

 

Symptom occurrence in persons with chronic fatigue syndrome

Abstract:

This investigation compared differences in the occurrence of symptoms in participants with CFS, melancholic depression, and no fatigue (controls). The following Fukuda et al. [Ann. Intern. Med. 121 (1994) 953] criteria symptoms differentiated the CFS group from controls, but did not differentiate the melancholic depression group from controls: headaches, lymph node pain, sore throat, joint pain, and muscle pain. In addition, participants with CFS uniquely differed from controls in the occurrence of muscle weakness at multiple sites as well as in the occurrence of various cardiopulmonary, neurological, and other symptoms not currently included in the current case definition. Implications of these findings are discussed.

 

Source: Jason LA, Torres-Harding SR, Carrico AW, Taylor RR. Symptom occurrence in persons with chronic fatigue syndrome. Biol Psychol. 2002 Feb;59(1):15-27. http://www.ncbi.nlm.nih.gov/pubmed/11790441

 

Maximal oxygen uptake and lactate metabolism are normal in chronic fatigue syndrome

Abstract:

PURPOSE: Previous studies in chronic fatigue syndrome (CFS) have reported reductions in maximal oxygen uptake (VO(2max)), yet often the testing procedures have not followed accepted guidelines, and gender data have been pooled. The present study was undertaken to reevaluate exercise capacity in CFS patients by using “gold standard” maximal exercise testing methodology and stratifying results on a gender basis.

METHODS: Sixteen male and 17 female CFS patients and their gender-, age-, and mass-matched sedentary controls performed incremental exercise to volitional exhaustion on a stationary cycle ergometer while selected cardiorespiratory and metabolic variables were measured.

RESULTS: VO(2max) in male CFS patients was not different from control values (CFS: 40.5 +/- 6.7; controls: 43.3 +/- 8.6; mL x kg(-1) x min(-1)) and was 96.3 +/- 17.9% of the age-predicted value, indicating no functional aerobic impairment (3.7 +/- 17.9%). In female CFS patients, VO(2max) was lower than control values (CFS: 30.0 +/- 4.7; controls: 34.2 +/- 5.6; mL x kg(-1) x min(-1), P = 0.002), but controls were higher than the age-predicted value (112.6 +/- 15.4%, P = 0.008) whereas the CFS patients were 101.2 +/- 20.4%, indicating no functional aerobic impairment (-1.2 +/- 20.4%). Maximal heart rate (HR(max)) in male CFS patients was lower than their matched controls (CFS: 184 +/- 10; controls: 192 +/- 12; beats x min(-1); P = 0.016) but was 99.1 +/- 5.5% of their age-predicted value. In female CFS patients, HR(max) was not different from controls (CFS: 183 +/- 11; controls: 186 +/- 10; beats x min(-1)) and was 98.9 +/- 5.1% of the age-predicted value. The VO(2) at the lactate threshold (LT) in each gender group, whether expressed in mL x kg(-1) x min(-1) or as a percentage of VO(2max), was not different between CFS patients and controls.

CONCLUSIONS: In contrast to most previous reports, the present study found that VO(2max), HR(max), and the LT in CFS patients of both genders were not different from the values expected in healthy sedentary individuals of a similar age.

Comment in:

Chronic fatigue syndrome, deconditioning, and graded exercise therapy. [Med Sci Sports Exerc. 2002]

VO2max and lactate production are not normal in all patients with chronic fatigue. [Med Sci Sports Exerc. 2002]

 

Source: Sargent C, Scroop GC, Nemeth PM, Burnet RB, Buckley JD. Maximal oxygen uptake and lactate metabolism are normal in chronic fatigue syndrome. Med Sci Sports Exerc. 2002 Jan;34(1):51-6. http://www.ncbi.nlm.nih.gov/pubmed/11782647

 

Chronic fatigue report delayed as row breaks out over content

The government’s long awaited report on the treatment of chronic fatigue syndrome could be in jeopardy after four key members resigned from the working group.

The move throws doubt on the validity of the report, which was due to be published in the first week of January. As the BMJ went to press, the chief medical officer, Liam Donaldson, had postponed its launch on 4 January 2002.

A total of 10 people from the original working group have resigned for various reasons since it was set up in 1998. The most recent resignations were highlighted in a written question by the Countess of Mar to health minister Lord Hunt on 17 December.

Two psychiatrists, a public health doctor, and a nurse therapist have resigned, saying that the report plays down the psychological and social aspects of the condition and concentrates on a medical model. Two patients are understood to have also resigned recently.

The group was set up to consider how best the NHS could care for people with the syndrome, also known as myalgic encephalomyelitis or “ME.”

But with so little still known about what causes the syndrome, how to diagnose it, and how best to treat it, it is understood that the report fails to provide the straightforward answers doctors may have hoped for.

You can read the rest of this article here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1121974/

 

Source: Eaton L. Chronic fatigue report delayed as row breaks out over content. BMJ. 2002 Jan 5;324(7328):7. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1121974/ (Full article)

 

Chronic fatigue and anxiety/depression: a twin study

Abstract:

BACKGROUND: Up to three-quarters of patients with fatigue syndromes have comorbid mood or anxiety disorders, suggesting that chronic fatigue is a forme fruste of anxiety or depressive states.

AIMS: To establish whether the association of chronic fatigue with psychological distress is causal or due to a common genetic or environmental factor.

METHOD: 69 monozygotic (MZ) and 31 dizygotic (DZ) female twin pairs, with only one co-twin reporting at least 6 months of fatigue, completed questions on fatigue, the General Health Questionnaire (GHQ) and a structured psychiatric interview. We examined the effects of three progressively more stringent definitions of chronic fatigue on four GHQ sub-scales.

RESULTS: Fatigued MZ and DZ twins by all definitions were significantly more depressed, anxious, somatically preoccupied and socially dysfunctional than their non-fatigued co-twins. Intrapair differences were similar in DZ and MZ twins, but non-significant differences were observed for the somatic symptoms and anxiety/insomnia sub-scales.

CONCLUSIONS: In this sample, chronic fatigue and psychological distress are strongly associated without evidence for genetic covariation, implying that the association is environmental, or due to overlapping definitions. Any genetic covariation missed is likely to involve anxiety rather than depression.

 

Source: Roy-Byrne P, Afari N, Ashton S, Fischer M, Goldberg J, Buchwald D. Chronic fatigue and anxiety/depression: a twin study. Br J Psychiatry. 2002 Jan;180:29-34. http://www.ncbi.nlm.nih.gov/pubmed/11772848

 

Blood volume and its relation to peak O(2) consumption and physical activity in patients with chronic fatigue

Abstract:

Individuals with chronic fatigue syndrome (CFS) experience a number of somatic complaints including severe, disabling fatigue, and exercise intolerance. We hypothesized that hypovolemia, through its interaction with central hemodynamics, would contribute to the exercise intolerance associated with this disorder. We examined blood volume, peak aerobic power, habitual physical activity, fatigue level, and their interrelations to understand the physiological basis of this disorder.

Seventeen patients who met the Centers for Disease Control criteria for CFS and 17 age-matched controls participated in the study. Blood volume was assessed using a single bolus injection of Evans blue dye. Peak oxygen consumption was measured during exercise on an upright cycle ergometer. Supine cardiac output and stroke volumes were measured using CO(2) rebreathing. Questionnaires were used to assess habitual physical activity and fatigue.

Patients displayed a trend for a 9% lower blood volume (58.3 +/- 2.1 vs. 64.2 +/- 2.5 ml/kg, P = 0.084) and had a 35% lower peak oxygen consumption (22.0 +/- 1.2 vs. 33.6 +/- 1.9 ml/kg, P < 0.001). These two variables were highly related within the patients (r = 0.835, P < 0.001) and the controls (r = 0.850, P < 0.001). Peak ventilation and habitual physical activity were significantly lower in the patients. Fatigue level was not related to any of the measured physiological parameters within the CFS group.

In conclusion, individuals with CFS have a significantly lower peak oxygen consumption and an insignificant trend toward lower blood volume compared with controls. These variables were highly related in both subject groups, indicating that blood volume is a strong physiological correlate of peak oxygen consumption in patients with CFS.

 

Source: Farquhar WB, Hunt BE, Taylor JA, Darling SE, Freeman R. Blood volume and its relation to peak O(2) consumption and physical activity in patients with chronic fatigue. Am J Physiol Heart Circ Physiol. 2002 Jan;282(1):H66-71. http://ajpheart.physiology.org/content/282/1/H66.long (Full article)