PROMISE IS AN NIH SPONSORED INITIATIVE TO CREATE AND VALIDATE INSTRUMENTS FOR A BROAD APPLICATION ACROSS, THIS IS THEIR QUOTE, A WIDE VARIETY OF CHRONIC DISEASE AND CONDITIONS IN THE GENERAL POPULATION. THEIR GOAL IS TO DEVELOP COMPARABILITY TO ALLOW COMPARISON ACROSS CONDITIONS. THESE INSTRUMENTS HAVE UNDERGONE A RIGOROUS EVALUATION OF RELIABLE AND VALIDITY. THEY ARE FLEXIBLE, ACCEPTABLE AND INCLUDE A VARIETY OF PLATFORMS AND AMAZINGLY KEEN [few] NUMBER OF ITEMS IN ORDER TO DEVELOP A SCORE.
NOW, HAVING SAID THAT, AT THE SAME TIME FEW WELL CHARACTERIZED INSTRUMENTS IN THE GENERAL POPULATION HAVE BEEN RIGOROUSLY EVALUATED FOR HOW THEY WILL WORK IN THIS PARTICULAR POPULATION. THIS REQUIRES MULTIPLE STUDIES AND MULTIPLE PATIENT POPULATIONS. THESE WELL VALIDATED INSTRUMENTS MAY NOT CAPTURE ALL THE ELEMENTS OF THESE DOMAIN IN ME/CFS.
JUST AS A QUICK EXAMPLE OF THE MFI 20 WHICH IS A MULTIPLE FATIGUE INVENTORY, 20 ITEMS, IN SUBSCORES YOU CAN SEE AS SHOWN IN THIS FIGURE GENERAL FATIGUE AND PHYSICAL FATIGUE ARE BOTH HAVE A CEILING EFFECT, THAT IS THE PATIENTS HAVE ALMOST MAXIMAL SCORE SO YOU'RE GOING TO BE VERY UNABLE TO USE THOSE SUBSCORES TO FOLLOW A CHANGE.
NOW, THE SELF-REPORTED MEASURES FOR CFS SPECIFIC DOMAINS, HAVE BEEN LESS INVESTIGATED. THERE HAS BEEN A RECENT REVIEW, I HAVE CITED AT THE BOTTOM. THIS REVIEW SUMMARIZES INFORMATION ON 11 ME/CFS SPECIFIC PATIENT REPORTED OUTCOMES BUT THEY HAVE MISSED THE QUESTIONNAIRE WHICH IS A NEWLY MORE NEWLY DEVELOPED. THESE CFS SPECIFIC MEASURES INCLUDE ACTIVITY, SYMPTOM, ILLNESS MANAGEMENT AND ILLNESS REPRESENTATION.
THE REVIEW IS A LITTLE DISCOURAGING IN THAT NONE HAVE PUBLISHED EVIDENCE OF
INTERPRETABILITY. THAT'S CRITICAL FOR USE AS YOU COME [outcome] MEASURE IN CLINICAL TRIALS. ALSO NO PUBLISHED EVIDENCE [of] MEASUREMENT ERROR PRECISION AND ACCEPTABILITY. POST EXERTIONAL MALAISE IS INCLUDED AS A SYMPTOM BUT THERE ARE NO DIRECT MEASURES OF IT.
WORKING IN THIS AREA WHICH IS IMPORTANT, THERE ARE LIMITATIONS AND RELYING ON PATIENT REPORTED OUTCOME MEASURES. SELF-REPORTED MEASURES OF SYMPTOMS ARE NOT FULLY OBJECTIVE. THEY CAN BE DIFFICULT TO ESTABLISH THIS MINIMAL CHANGE THAT WE HAVE BEEN TALKING ABOUT. WHAT WILL MAKE A MEANINGFUL--CLINICALLY MEANINGFUL DIFFERENCE.
AND IT CAN BE VERY CHALLENGING TO ISOLATE DOMAINS OF ILLNESS, I DREW THOSE CIRCLES LIKE THEY WERE THINGS BUT THEY'RE VERY OVERLAPPING CONCEPTS, FOR EXAMPLE MOOD AND SLEEP CAN DEFINITELY IMPACT FUNCTION AND PAIN. COGNITIVE IMPAIRMENT AND LANGUAGE PROBLEMS CAN AFFECT UNDERSTANDING AND CAPACITY FOR RESPONDING TO ALL OF THESE.
FINALLY THERE ARE REALLY IMPORTANT ASPECTS OF THE POTENTIAL FIZZ QUO LOGIC [physiologic] ABNORMALITIES IN ME/CFS THAT ARE NON-SPECIFICALLY REPRESENTED SYMPTOMS. ANOTHER WAY OF SAYING THIS, THERE'S ONLY SO MANY WAYS YOU CAN HEAL [feel] AND SO MANY UNDERLYING ISSUES. THESE INCLUDE IMMUNE ENDOCRINE AUTONOMIC AT THIS FUNCTION [dysfunction] AS JUST A START. REALLY WHOLE HI [poorly] CAPTURED IN SELF-REPORTED MEASURES (emphasis added).