All of that feeds around upon itself in a vicious cycle: inflammation and swelling and fluid release causing an increase in pressure causing yet more inflammation, swelling and fluid release. All this together is 'mass effect'.
When a person presents with a brain tumour, the symptoms are not from the tumour itself, the tumour does not alter brain cells. The symptoms arise from the mass effect. Symptoms vary from person to person with exquisite differences because of the location of the mass effect and because of the brain's complexity and diversity of functions. If, over the course of disease, the location of the lesion remains the same, the symptoms may remain or grow from the initial symptoms experienced. There may be new symptoms if the mass effect becomes much greater or if there is a 'recurrence' of tumour in another location in the brain.
The use of dex thus becomes very important, to oppose symptoms, to prolong life and quality of life. In addition, consider the reality that as pressure builds, the impact on the brain is unlikely to be a simple graph line upwards, things break and there can be sudden deteriorations from which it may not be possible to recover.... so you take dex to avoid such catastrophic disease 'progression'.
- dex may relieve symptoms, if there has not been irretrievable damage
- renewed symptoms call for consultation with a doctor about upping the dose of dex... it is possible that the symptoms may arise during the treatment cycle or just in variations of effectiveness of the dex day to day, so a brief boost in dose may be of value
- or renewed symptoms may mean that tumour is growing again, needing both management with dex and investigation and treatment if possible
It follows that it is important for patient and carer to report any substantial change in symptoms, any new symptoms, to the treating doctor... being a doctor familiar with use of dex in brain tumour. Do not expect every GP to be familiar with that, or every doctor on hand at emergency.
The need for complex management and higher dosing with dex will vary with the nature of the tumour, especially its aggressiveness... that is, if it is a higher grade tumour there will be more mass effect, more treatments, more changes in the situation.
NOW, WHY IT IS IMPORTANT TO GET OFF DEX IF YOU CAN.
Taking doses of corticosteroid higher than normal production will distort a wider array of steroidal hormone activity. The symptoms may be of
Cushing's Syndrome. This may be unpleasant, it may be more serious. (NOTE also that the management of the hormones involved is in part by areas of the limbic system in the brain which can be impacted by tumour, depending on location, so some of the symptoms of Cushing's may be present in other circumstances. And these hormones can be disordered by stress of whatever kind and thus easily tipped further in some cases by smaller doses of dex.
Among important considerations to note are that the person taking dex is likely to have a big appetite and in any case gain weight. Also be aware that cortisol and thus dex are 'catabolic' substances, pulling minerals from bone and muscle (as is normal in daily exercise, but this is unrelieved) so that bones at the top of leg and arm become weak and dangerously brittle. Take care with contact sports and ski-ing!
There may also be a swing to diabetes symptoms, which need attention... the symptoms to watch for are frequent urination and great thirst.
Unfortunately also, a small proportion of people experience violent psychiatric symptoms, psychosis,
research here. The psychotic reaction is really different from the tendency in the Cushings Syndrome circumstance (see earlier link) for mood change and anxiety, which are in any case things one may experience in dealing with a brain tumour... Do seek support if the lesser symptoms become troubling. Do note that the psychosis problem is likely to emerge fairly swiftly, you will tend to know if this is going to happen pretty quickly. NOTE that to continue using dex in circumstances of psychosis is likely to require advice from another medical speciality, the psychiatrist, to administer anti-psychotic drugs.
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Given the hazards associated with use of corticosteroid drugs, among which dex is the biggie, there is a general reluctance to their use by many very sensible medical practitioners and definitely a desire for the patient to get down off the drug as soon as possible. You do not want a person aged 20 to have lifelong disability from inappropriately sustained corticosteroid therapy. However, the outlook for someone with an brain tumour is different, because the threat to life without dex may be very great. And quality of life may be seriously diminished without it.
Nevertheless, all along the way, efforts need to be taken to reduce the dose. If it has been up just for a few days, it may be reduced swiftly. If for longer, much more care in weaning... look to the
Addison's symptoms, the opposite end of the spectrum from Cushing's. There is also a need for special care when the dose is falling below normal daily production, between 1mg a day and 0.5mg dose. Here a good doctor will stop regular simple dose division and give the patient a day on, a day off, or such, to jolt the system back to life while avoiding bad side effects. The ideal situation for any brain tumour patient is thus to have complete remission of disease, no tumour growth on scans, no need for dex, Hooray!
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DEX AND OPERATIONS
Normally there will be a larger dose of dex administered over several days before neurosurgery, to reduce swelling and make the operation safer.
Then, however, there will be a need after the operation to lower the dose swiftly — as well as opposing inflammation dex opposes wound repair, and you need that repair.
THEN, however, especially in patients who have had multiple other treatments, healthy brain tissues may be angered by yet another intrusion and there may be a new round of swelling and symptoms. Do not allow despair to build among treating doctors, ask them to whack the dex back up and see what happens!
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END OF LIFE USE OF DEX
We all, all, want life to continue with maximum quality of life and then drop swiftly and painlessly. Well, dex can help with that... it is not a cure for brain tumour any more than for toothache, but with brain tumour it may help a patient to get the maximum from life for as long as possible and then facilitate comfortable dying.
Some special considerations apply at end of life. Dex can often be used, with rising doses, to sustain a quality of life in a brain tumour patient such that the patient does not slip into long somnolence or coma, or desperately frustrating disability. So the dex dose may be raised (all this under the supervision of the right doctors who know what they are doing) until of no further value, no further benefit. Then the question becomes whether to maintain the high dose or withdraw it. Weaning bit by bit does seem to be in the minds of some doctors but the anecdotal evidence is that it is a very unkind thing to do. Withdrawal of dex entirely in a patient near death (not eating, not drinking, not communicating) means that half the drug will be gone from the system within a day and this is likely to allow the mass effect to have lethal consequence. This is not euthanasia, but withdrawing of a useless substance. It may be an issue for most if the tumour is not reversed and has its way. Discussion of end-of-life choices is something for every adult, well or sick. And all this, every idea and suggestion, every notion of possible treatment here, is guidance for discussion with a doctor, nota case for independent action, this is a major drug.
I am not a doctor, talk to your doctor about any of this, the issues vary from person to person.
Written on the basis of almost a decade experience sharing the histories of brain tumour patients and studying the biochemical issues. We eventually learned enough to use dex well when my wife Margaret had a GBM in 2000-2001