{"id":44516,"date":"2019-04-26T16:50:35","date_gmt":"2019-04-26T15:50:35","guid":{"rendered":"https:\/\/blogs.bmj.com\/bmj\/?p=44516"},"modified":"2019-05-03T11:52:28","modified_gmt":"2019-05-03T10:52:28","slug":"jeffrey-aronson-when-i-use-a-word-important-differences","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bmj\/2019\/04\/26\/jeffrey-aronson-when-i-use-a-word-important-differences\/","title":{"rendered":"Jeffrey Aronson: When I use a word . . . Important differences"},"content":{"rendered":"

\"jeffrey_aronson\"<\/a>I have <\/span>previously<\/span><\/a> discussed the idea of a minimal clinically important difference (MCID), and in my <\/span>last piece<\/span><\/a> focused on the word \u201cclinically\u201d. I suggested that it implied activity at the bedside, and that omitting it from the original phrase, making it a minimal important difference (MID), as its originators had <\/span>suggested<\/span><\/a>, was therefore justified.<\/span><\/p>\n

This argument is an etymological one. The word \u201cclinical\u201d comes from <\/span>Greek\u2014\u03ba\u03bb\u03af\u03bd\u03b7, a bed.<\/span> Taking its origin literally, if it\u2019s clinical it\u2019s at the bedside. <\/span>However, one should not commit t<\/span>he etymological fallacy, inappropriately insisting that the current meaning of a word or phrase should exactly reflect the meanings of the word or words from which it is derived. For example, \u201cprestigious\u201d is from Latin, praestigiosus, full of trickery or deceitful, which is what it meant when it entered English in the 16<\/span>th<\/span> century; nowadays it means of high status, inspiring respect and admiration. Meanings change.<\/span><\/p>\n

Although \u201cclinical\u201d implied events at the bedside when it entered English in the late 18<\/span>th<\/span> century, it is no longer so strictly limited. A clinical lecture, originally one that was given at the bedside, is now any lecture on a medical subject. A clinical thermometer can be used anywhere, not just at the at the bedside. And a clinical pharmacologist specializes in everything about medicinal products used in humans, including their development, regulation, and use. But although \u201cclinical\u201d has lost its restrictive bedside connotation, it still nevertheless implies medical interventions.<\/span><\/p>\n

Thus, the proposed removal of the word \u201cclinically\u201d from \u201c<\/span>minimal clinically important difference\u201d was intended to bring the patient, not the clinician, into focus. Removing it also draws attention to the word \u201cimportant\u201d. For whom is an important difference important?<\/span><\/p>\n

The answer should be \u201cthe patient\u201d, and terms such as \u201cpatient important\u201d and \u201cpatient oriented\u201d have been <\/span>suggested<\/span><\/a>. But others may benefit as well or instead. <\/span><\/p>\n

For example, some improvement in cognitive ability in a patient with Alzheimer\u2019s disease may benefit the patient relatively little, but be of great importance to carers and relatives.<\/span><\/p>\n

In systems in which the patient pays for healthcare at the point of delivery, small differences may be of little importance to the patient but benefit those who gain financially from providing the improvement. This can result in <\/span>too much healthcare<\/span><\/a>\u2014too much screening of asymptomatic individuals, too much investigation of those with symptoms, too much reliance on biomarkers, too many quasi-diseases, too much diagnosis, too much treatment, too many adverse reactions, and too much inappropriate monitoring. <\/span><\/p>\n

Even in the NHS, incentives to seek small differences may reward the practitioner, with minimal benefit to the patient. For example, the Quality Outcomes Framework (QOF) system in the UK rewards general practitioners for achieving targets. If a patient\u2019s HbA<\/span>1c<\/span> concentration is 64 mmol\/mol (8%), lowering it to 59 mmol\/mol (7.5%) will contribute to the doctor\u2019s QOF points, and therefore income, for achieving the target, while benefiting the patient little and incurring extra NHS expenditure in tests, treatment, and monitoring. The QOF system is currently being phased out, and although some diabetes indicators are no longer included, points for lowering HbA<\/span>1c<\/span> are still <\/span>awarded<\/span><\/a>, as far as I can tell. <\/span>In other cases achieving a QOF target may cause the patient harm. For example, when a GP earns QOF points by diagnosing stage 3 chronic kidney disease, the patient\u2019s insurance status is altered without necessarily altering their healthcare. <\/span>This is not what the minimal important difference was supposed to do.<\/span><\/p>\n

Sometimes an important difference that benefits one individual may harm another. For example, a screening test that detects a few treatable cases may yield false positives that lead to harmful investigations. Take, for example, an analysis by the Canadian Task Force on Preventive Health Care of data from lung cancer screening (Figure 1). Of every 1000 individuals screened there were 40 true positive tests and three fewer deaths from lung cancer as a result of treatment; however, of 351 individuals with false positive tests, three had major complications and one died from invasive follow-up tests.<\/span><\/p>\n

A difference that is important for one individual may not be important for another.<\/span><\/p>\n

\"\"<\/a><\/p>\n

Figure 1.<\/b> The results of screening 1000 individuals using low-dose CT scanning compared with chest radiography (adapted from data <\/span>presented<\/span><\/a> by the Canadian Task Force on Preventive Health Care)<\/span><\/p>\n

Acknowledgement:<\/strong> Thanks to Kamal Mahtani for helpful comments.<\/span><\/p>\n

Jeffrey Aronson<\/strong>\u00a0is a clinical pharmacologist, working in the Centre for Evidence Based Medicine in Oxford’s Nuffield Department of Primary Care Health Sciences. He is also president emeritus of the British Pharmacological Society.<\/em><\/p>\n

Competing interests:<\/strong>\u00a0None declared.<\/p>\n","protected":false},"excerpt":{"rendered":"

I have previously discussed the idea of a minimal clinically important difference (MCID), and in my last piece focused on the word \u201cclinically\u201d. I suggested that it implied activity at […]<\/p>\n

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