Diagnostic Approaches and Management Aspects of Early Dementia
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DIAGNOSTIC APPROACHES AND MANAGEMENT ASPECTS OF EARLY DEMENTIA. DIAGNOSTIC APPROACHES AND MANAGEMENT ASPECTS OF EARLY DEMENTIA. DIAGNOSTISCHE BENADERINGEN EN MANAGEMENT ASPECTEN VAN VROEGE DEMENTIE. Proefschrift ter verkrijging van de graad van doctor aan de Erasmus Universiteit Rotterdam op gezag van de rector magnificus Prof. Dr. C.J. Rijnvos en volgens besluit van het College van Dekanen. De openbare verdediging zal plaatsvinden op woensdag 8 mei 1991 om 15.45 uur. door THERESIA JOHANNA MARIA VAN DER CAMMEN geboren te Rotterdam Promotiecommissie: Promotoren: Prof. Dr. F.J.G. Oostvogel Prof. Dr. W.J. Schudel Overige leden: Prof. ·or. A Holman Prof. Dr. MAD.H. Schalekamp ~edrukt door: Drukkerij Haveka B.V., Alblasserdam. VoorJohanna CONTENTS Chapter 1: Introduction. 1 1.1: The concept of dementia: A historic overview. 4 1.2: Current concepts of dementia, definitions, diagnostic criteria and differential diagnosis. 19 1.3: The size of the problem: Epidemiology of dementia. 53 1.4: The challenge of early diagnosis. 86 Chapter II: Aim of the study. 127 Chapter Ill: The value of the Mini-Mental State Examination in a geriatric outpatient population in The Netherlands. 132 Chapter IV: Memory function and early diagnosis of dementia in general practice. 144 Chapter V: The Memory Clinic: A new approach to the detection of dementia. 193 Chapter VI: Discussion and recommendations for future studies. 210 Chapter VII: Summary. 222 Samenvatting 233 Dankwoord 245 Curriculum vitae 248 Addendum CHAPTER 1: INTRODUCTION. 1 CHAPTER 1: INTRODUCTION. Learning (the acquisition of new knowledge) and memory {the retention of knowledge) are abilities which have assumed increasing importance in the climb up the evolutionary tree. How organisms learn and remember is one of the most interesting problems in neuroscience (Morris et al 1988). The loss of these abilities in man is one of the most devastating clinical problems for individual sufferers, their carers and for society at large. The commonest cause of such loss is Alzheimer type dementia. This thesis discusses diagnostic approaches and management aspects of early dementia, especially of the Alzheimer type. 2 I Introduction. Reference. Morris RGM, Kandel ER, Squire LR (1988) The neuroscience of learning and memory: cells, neural circuits and behaviour. Trends in Neuroscience 11: 125-127. 3 1.1 THE CONCEPT OF DEMENTIA: A HISTORIC OVERVIEW. The concept of dementia that we know today, has evolved over many centuries, as was pointed out by Mahendra (1987) in his excellent review of the history of the concept. 'Dementia' corresponds to latin 'dementatus' - that is, out of one's mind, crazed, applicable to any and all abnormal, unusual, incomprehensible or bizarre behaviour. Over 20 centuries the term has been adapted to suit conditions that were current in any given society. It is easy to understand that a concept now employed in most instances in relation to the elderly sick in de 20th century might not have had much meaning for the very different populations, patients and practitioners of the past. For a start, living to be old was a distinctly unusual phenomenon in past centuries. Very few in the population survived to the senium, the period of life in which dementia becomes a calculable prospect rather than a chance occurrence. An estimate of those reaching the age of 65 in primitive society is around 3%; the lifespan, on the average, of a subject in the Roman Empire was less than 30 years; an Englishman in 1700 could hope to live a mean of 35 years; in 1840 the span of life in western Europe had risen to 40-43 years, and in the 1980s it is 76-80 years, women living to the higher age. In those early days, while the small number of the elderly would have shown the common cognitive changes associated with normal old age, only a minute proportion would have become demented in a modern sense. It is easy to see how the features of pathologic old age in the few would have been swamped by the relatively larger number of the elderly showing subtler physiological changes (Mahendra 1987). The account of earlier approaches to senility and attitudes to old age owes much to George Rosen's excellent paper (Rosen 1961). Rosen quotes Cicero's essay on old age in the 2nd century BC. The major preoccupation in this age was the practice of mental hygiene. Poets and philosophers, at leaat, wondered if an active mentsl life might not forestall or postpone the decrepitude of old age. Cicero wrote: 'It is our duty to resist old age; to compensate for its defects by a watchful care; to fight against it as we would fight against disease .... Much greater care is due to the mind and soul; for they, too, like lamps, grow dim with time, unless we keep them supplied with oil.... 4 1.1 The concept of dementia: A historic overview. Intellectual activity gives buoyancy to the mind .... Old men retain their mental faculties, provided their interest and application continue... the aged remember everything that interests them ... .' (Rosen 1961) Aurelius Cornelius Celsus (30 BC-AD 50), a Roman writer on medical subjects, introduced the terms 'delirium' and 'dementia' in his encyclopaedia 'De re medicine', published around AD 30 (Alexander & Selesnick 1966; Upowski 1980; Upowski 1981 ). A century later, the term 'senile dementia' itself seems to have been first used by Aretaeus, the physician of Cappadocia. He mentions 'the dotage which is the calamity of old age ... dotage commencing with old age never intermits, but accompanies the patient until death; while mania intermits, and with care ceases altogether' (Rosen 1968; Alexander 1972). Aretaeus may have been the first to use the equivalent of the term 'senile dementia' - dotage - and to distinguish it from 'secondary' dementia (Menninger et al 1963). In the 2nd century AD, when only a fraction of humanity was still destined to reach old age, Juvenal (AD 60-130) dealt with the subject of dementia with pessimism and bitterness in his tenth satire: 'But worse than all bodily failing is the weakening mind which cannot remember names of slaves, nor the face of a friend he dined with last evening, cannot remember the names of offspring begotten and reared ... .' (Upowski 1981) A couple of centuries later, in the 4th century AD, Oribasius, physician to the Emperor Julian, wrote of cerebral atrophy in his 'Digest of Medicine and Surgery'. This disease was thought to manifest itself by loss of intellectual capacity and weakness of movement (Rosen 1961 , 1968). Wrth regard to depression, Rosen (1961) notes that in the 9th century AD Rhazes the Persian physician mentions melancholy as an inevitable condition in the lives of old and decrepit persons. The Moslem writers of the Middle Ages seem to have had ideas similar to those of the Graeco-Romans on the nature of old age. The inevitable decrepitude and melancholic character of old age were commonplace ideas during the 5 1.1 The concept of dementia: A historic overview. Renaissance period but the principal sources remained the ancient authors or mediaeval writers indebted to classical thought (Rosen 1961 ; Mahendra 1987). Robert Burton (1577-1640), the author of 'Anatomy of Melancholy', observed that 'after seventy years all is trouble and sorrow'. He had views on the relationship between old age and melancholy too, saying that old age was 'natural to all ... being cold and dry, and of the same quality as Melancholy is, must needs cause it, by diminution of spirits and substance ... .' Shakespeare (1564-1616) has shown remarkable understanding of the psychological make-up of his fellow men, as is revealed by the words he puts into the mouths of many of the characters in his plays. He decribes 'senile decay' in 'As you like it': 'The sixth age shifts Into the lean and slipper'd pantaloon, With spectacles on nose and pouch on side; His youthful hose, well sav'd, a world too wide For his shrunk shank; and his big manly voice, Turning again towards childish treble, pipes And whistles in his sound. Last scene of ail . That ends this strange eventful history, Is second childishness and mere oblivion, Sans teeth, sans eyes, sans taste, sans everything'. (As You Like it) Shakespeare notes the effect of ageing on the manifestations of mental disorders in 'King Lear'. Lear has been quoted as the prime example of involutional depressive illness (Trethowan 1988). He appears in the play as a melancholic, characteristically hell-bent on self-destruction. Later on, he demonstrates forgetfulness, as is revealed in his speech to his daughter Cordelia and his physician: 'Pray do not mock me: I am a very foolish fond old man, Fourscore and upward, not an hour more nor less; 6 1.1 The concept of dementia: A historic overview. And to deal plainly, I fear I am not in my perfect mind. Methinks I should know you, and know this man; Yet I am doubtful: for I am merely ignorant What place this is; and all the skill I have Remembers not these garments; nor I know not Where I did lodge last night.' (King Lear) Lear's forgetfulness suggests that degenerative changes leading to senile dementia are beginning to supervene, but as Trethowan (1988) has pointed out, Shakespeare did not portray the distressing state of the final stage of senile dementia in any of his plays. Perhaps the reason why Shakespeare, with his remarkable insights, did not go into the matter further, was that people in his day did not live as long as they do now. Furthermore, preferring sudden death by violence, he probably did not consider senile decay a very enlivening subject with which to entertain Elizabethan theatre audiences (T rethowan 1988).