CFS CFS History and Nomenclature 2 — Questions and Answers
Question 1: What were the 1994 CDC (Fukuda) diagnostic criteria for CFS primarily based on?
- Blood tests and biomarkers
- Clinically evaluated, unexplained fatigue plus 4 of 8 specified symptoms (Correct answer)
- Brain imaging findings
- Genetic testing results
Correct answer: Clinically evaluated, unexplained fatigue plus 4 of 8 specified symptoms
The 1994 Fukuda criteria required clinically evaluated, unexplained fatigue lasting 6+ months plus at least 4 of 8 specified symptoms such as cognitive impairment, sore throat, and post-exertional malaise.
Question 2: What major criticism was leveled at the 1994 Fukuda criteria for CFS?
- They were too strict and excluded too many patients
- PEM was not required, potentially including patients without the hallmark symptom (Correct answer)
- They required too many diagnostic tests
- They were only applicable to women
Correct answer: PEM was not required, potentially including patients without the hallmark symptom
A major criticism of the Fukuda criteria was that post-exertional malaise was not a required symptom, meaning patients without this hallmark of CFS could still receive the diagnosis.
Question 3: What were the 2003 Canadian Consensus Criteria (CCC) designed to achieve?
- Replace the ICD classification system
- Create a more specific clinical definition requiring PEM as a core feature (Correct answer)
- Expand the CFS definition to include more patients
- Define CFS for disability insurance purposes only
Correct answer: Create a more specific clinical definition requiring PEM as a core feature
The Canadian Consensus Criteria were designed to create a more specific clinical definition that required PEM as a core feature, aiming to identify a more homogeneous patient population.
Question 4: What was the 'XMRV controversy' in CFS research?
- A debate about exercise therapy
- A retracted 2009 study claiming a link between XMRV retrovirus and CFS that could not be replicated (Correct answer)
- A dispute about the name ME vs CFS
- A controversy about disability benefits for CFS patients
Correct answer: A retracted 2009 study claiming a link between XMRV retrovirus and CFS that could not be replicated
The 2009 Science paper claiming a link between XMRV retrovirus and CFS generated enormous hope but was later retracted after multiple labs failed to replicate the findings.
Question 5: What are the 2015 IOM diagnostic criteria for ME/CFS notable for requiring?
- Genetic testing
- Post-exertional malaise, unrefreshing sleep, and cognitive impairment as core required features (Correct answer)
- Monthly physician visits
- Exclusion of all other diseases via extensive testing
Correct answer: Post-exertional malaise, unrefreshing sleep, and cognitive impairment as core required features
The 2015 IOM criteria made PEM, unrefreshing sleep, and cognitive impairment required core features, representing a more biologically grounded definition than previous criteria.
Question 6: Which federal agency in the US funds most CFS/ME research and has historically been criticized for underfunding it?
- FDA
- NIH (National Institutes of Health) (Correct answer)
- CDC
- Department of Veterans Affairs
Correct answer: NIH (National Institutes of Health)
The NIH funds most CFS/ME research in the US and has faced criticism from advocates for historically low funding levels relative to the disease burden.
CFS CFS History and Nomenclature 2
What were the 1994 CDC (Fukuda) diagnostic criteria for CFS primarily based on?