In memory of my classmate QIAN Yi-jian

QIAN Yi-jian, M.D., chief editor emeritus of the Chinese Medical Journal, passed away on July 6, 2011.Yi-jian was my closest classmate from St.John's University School of Medicine, Shanghai (Figure 1).Over the years,Yi-jian was always close by my side in all the important meetings in China (Figure 2) and the United States(Figure 3).     

Sleep stages, memory and learning.

Learning and memory can be impaired by sleep loss during specific vulnerable windows for several days after new tasks have been learned. Different types of tasks are differentially vulnerable to the loss of different stages of sleep. Memory required to perform cognitive procedural tasks is affected by the loss of rapid-eye-movement (REM) sleep on the first night after learning occurs and again on the third night after learning. REM-sleep deprivation on the second night after learning does not produce memory deficits. Declarative memory, which is used for the recall of specific facts, is not similarly affected by REM-sleep loss. The learning of procedural motor tasks, including those required in many sports, is impaired by the loss of stage 2 sleep, which occurs primarily in the early hours of the morning. These findings have implications for the academic and athletic performance of students and for anyone whose work involves ongoing learning and demands high standards of performance.     

11: disorders of memory and intellect.

The clinical approach to the patient with a suspected disorder of memory and intellect is to establish whether it is dementia, which parts of the brain are affected, what is the cause, what is the prognosis, and what can be done about it. The diagnosis of dementia usually requires the involvement of memory and at least one other cognitive system. Delirium and depression are important differential diagnoses. Patients with dementia should usually have some simple investigations after a careful history-taking and examination to identify "reversible" causes. The commonest cause of dementia is Alzheimer's disease, in which short-term memory disturbance is usually prominent. Other causes of dementia include cerebrovascular disease, Lewy-body disease and Pick's disease. There is now hope for patients with Alzheimer's disease (which can be treated with some success with cholinesterase inhibitors) and patients with vascular dementia, in whom aggressive control of causal risk factors may retard progression.     

In defence of ageism.

Health care should be preferentially allocated to younger patients. This is just and is seen as just. Age is an objective factor in rationing decisions. The arguments against 'ageism' are answered. The effects of age on current methods of rationing are illustrated, and the practical applications of an age-related criterion are discussed. Ageist policies are in current use and open discussion of them is advocated.