Brain disorders falling

Defects of complex IV. These disorders, also termed COX deficiency, have clinical phenotypes that fall into two main groups one in which myopathy is the predominant or exclusive manifestation and another in which brain dysfunction predominates (Fig. 42-3). In the first group, the most common disorder is fatal infantile myopathy, causing generalized weakness, respiratory insufficiency and death before age 1 year. There is lactic acidosis and renal dysfunction, with glycosuria, phosphaturia and aminoaciduria, also termed DeToni-Fanconi-Debre syndrome. The association of myopathy and cardiopathy in the same patient and myopathy and liver disease in the same family has also been described [14]. 

But why are hypnopompic hallucinations even more unwelcome than hypnagogic ones Probably because most people find that falling asleep is easily understood as a time of increasing disorder of the brain-mind and, as such, better tolerated because it is also a time of diminishing awareness of internal experience. Waking up, on the other hand, is a time when increasing orderliness is expected, and waking is followed by persistent awareness that allows critical self-reflection. 

Most of the neurological disorders associated with the neuroleptics fall into the category of extrapyramidal reactions or extrapyramidal symptoms, and are often designated EPS. The extrapyramidal system of the brain is an extensive, complex network that moderates and adjusts motor... 

Fatigue to the point of exhaustion almost always accompanies tardive disorders of any severity. Patients often become exhausted by the movements, by the effort to hide them, and by increased difficulty associated with carrying out daily activities. The primary impact on the brain itself may also produce fatigue. Although the disorders tend to disappear in sleep, they can make it difficult to fall asleep, adding to the exhaustion. Having to contend with the physical pain associated with tardive akathisia (inner torment) and with tardive dystonia (muscle spasms) can also wear a person down. 

Most metabolic acid-base disorders develop slowly, within hours in diabetic ketoacidosis and months or even years in chronic renal disease. The respiratory system responds immediately to a change in acid-base status, but several hours maybe required for the response to become maximal. The maximum response is not attained until both the central and peripheral chemoreceptors are fully stimulated. For example, in the early stages of metabolic acidosis, plasma pH decreases, but because H ions equilibrate rather slowly across the blood-brain barrier, the pH in CSF remains nearly normal. However, because peripheral chemoreceptors are stimulated by the decreased plasma pH, hyperventilation occurs, and plasma PCO2 decreases. When this occurs, the PCO2 of the CSF decreases immediately because CO2 equilibrates rapidly across the blood-brain barrier, leading to a rise in the pH of the CSF. This will inhibit the central chemoreceptors. But as plasma bicarbonate gradually falls because of acidosis, bicarbonate concentration and pH in the CSF wih also fall over several hours. At this point, stimulation of respiration becomes maximal as both the central and peripheral chemoreceptors are maximally stimulated. 

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