Endolymphatic hydrops is too known as Meniere's disease. Classically described the agency of Prosper Meniere during 19th century, this grade is due to swelling up of the endolymphatic sac. This causes fluctuating dejected tone sensory neural hearing loss, tinnitus and episodic dizziness.
Causes:
1. Idiopathic (Most common)
2. Viral infections
3. Allergy
4. Syphilis
5. Cochlear otosclerosis
6. Hormonal imbalances causing shed retention
Pathophysiology:
Meniere's disease means of definition is idiopathic endolymphatic hydrops characterised by roaring tinnitus, vertigo, fluctuating hearing damage. Even though sometimes erroneously used alternately, Meniere's disease is different from endolymphatic hydrops. It should be borne in mind that the limit endolymphatic hydrops indicates the underlying pathophysiological mechanical construction of Meniere's disease. Endolymphatic hydrops be possible to infact be classified as primary and inferior according to the causative factors involved. Primary endolymphatic hydrops is in real existence the classic Meniere's disease in what place in the underlying etiology is obscure. In secondary hydrops the etiopathogenesis of the underlying malady is clearly elucitable.
Medical management of Meniere's disease includes:
1. Dietary management
2. Physiotherapy
3. Psychological act
4. Pharmacologic intervention
Dietary management:
This includes abasement of sodium in the diet. Infact it was Frustenberg in 1934 who introduced a dejected salt diet for patients with Meniere's distemper. Pathophysiology of Meniere's disease is expatiation of membranous labyrinth due to surplus accumualtion of endolymphatic fluid. Any essay to reduce this fluid level resolution help in alleviate the symptoms of the quiet.
Medical management is mainly used to manage patients during the acute phase of the impugn. Vestibular suppresants are commonly used. Drugs used to have charge of attacks of vertigo have varying levels of anticholinergic, antiemetic and anodyne properties. Drugs used to alleviate symptoms take in phenothiazines (prochlorpherazineand perphenazine), antihistamines like ( cinnarizine, cyclizine, dimenhydrinate, and meclizine hydrochloride), benzodiazepines like (lorazepam and diazepam).
Vestibular suppressants:
Diazepam: at the time that used acts as vestibular depressant. It in like manner alleviates the anxiety associated with this derangement. The beneficial effects of diazepam ib vestibular rule is presumed to be due to some increase in the cerebellar GABA-ergic method. Stimulation of cerebellar GABA-ergic combination of parts to form a whole mediates inhibition on the vestibular response. This drug is very useful in alleviating swimming of the head especially when associated with anxiety. Usual drench is 5 mg administered orally each 3 hours. The initial dose may also be administered intravenously.
Antiemetic drugs:
Drugs gift to this group helps to dull vomiting in Meniere's disease.
Anticholinergic drugs:
Glycopyrrolate y anticholinergic drug when combined with diazepam is profitable in controlling inner ear symptoms of aversion and vomiting. In adults it is administered in doses of 1-2 mg. It may besides be administered as intramuscular injection (0.1 - 0.2 mg) every 4 hours. Side effects (reversible) of this deaden with narcotics includes dry mouth, distortion of of the sight acuity, exacerbation of symptoms in patients through prostatic hypertrophy. This drug is contraindicated in patients with glaucoma and prostatic hypertrophy.
Antidopaminergic drugs:
Droperidol: This is every antidopaminergic drug used to alleviate the symptoms of Meniere's illness. This drug is aministered in doses of 2.5 - 10 mg orally in adults. If administered intravenously it is given in the same manner with 5 mg bolus. This drug has fewer incidence of take s effects like extrapyramidal symptoms / sedation / hypotension.
Prochlorperazine: This remedy belongs to phenothiazine group. It is used taken in the character of an antiemetic and a potentiator of analgesic and soporific drugs. Usual recommeded dose is 10 mg given orally or intramuscularly every 4 - 6 hours in adults. This drug has excellent antiemitic effect.
Antihistamines:
Dimenhydrinate: is salutary in preventing and treating vertigo associated with Meniere's disease. It is too very effective in controlling nausea and vomiting. Only border effect of this drug is its ply to cause drowsiness. It is administered viewed like 50 - 100 mg doses thrice a time. This drug can also be adminsitered intramuscularly / intravenously.
Diphenhydramine: This drug is not useful in treating shrewd vertigo. It may be useful in stoppage of vertigo. The usual duration of force is 4-6 hours. Usually this put s into is administered as an initial loading prescribed portion of 50 mg orally.
Meclizine: This mix with s is one of the most serviceable antiemetics to prevent / treat nausea and vomiting assocaited through vertigo of vestibular origin. It has a slower attack and a longer duration of contest (24 hours). For vertigo the habitual dose administered in adults is 25 - 100 mg quotidian in divided doses. Side effects of this mix with s include: drowsiness, blurred vision, drowsiness.
Promethazine: This deaden with narcotics has pronounced antihistaminic activity in etc to its strong central cholinergic blocking briskness. It is effective in the manipulation of vertigo and motion sickness. It is adminsitered usually in doses of 25 mg every 4 to 6 hours. One greater advantage of this drug is that it can be adminsitered rectally, when severe vomiting prevents its operative oral administration. Most common side general intent of this drug is sedation.
Maintenance therapy:
The goal of provisions therapy is
1. To prevent bright attacks of vertigo
2. To preserve hearing in Meniere's disease
This therapy usually includes dietary modifications combined with pharmacological intervention.
Dietary modifications: The mainstay of diet modifications is to curtail sodium intake. A very low sodium intake or at a moderate price sodium diet is usually recommended. A tense low sodium diet means a diurnal allowance of 1500 mg. This is a exceedingly stringent diet and patients find it extremely difficult to comply with this diet. A greater degree practical approach would be to deliberate the patient to avoid excessively salty subsistence. Restrictions are also imposed on the intake of caffeine, nicotine and highly rectified spirit.
Diuretics:
The use of diuretics in the bread therapy is based on the supposition that these drugs can alter the fluid balance of inner ear, leading to a depletion of endolymph and a correction of hydrops. In 1934 Furstenburg demonstrated that the symptoms of Meniere's ailment were due to retention of sodium. He went attached to recommend a low sodium diet / practice of diuretics to control Meniere's illness. Boles in 1975 demonstrated that greatest in quantity patients had their vertigo controlled through an 800 - 1000 mg of sodium diet / day.
Hydrochlorthiazide: This diuretic causes natriuresis and kaliuresis means of blocking sodium reabsorption in the crook of Henle. Potassium supplementation is required in patients using this drug. Side effects of this drug embody: hypokalemia, hyperglycemia, hypotension, and hyperuricemia. It is usually administered similar to 50 mg tabs orally / day in adults. Potassium supplements is usually required in these patients.
Dyazide: Is a potassium parsimonious diuretic. It can be conveniently administered in the manner that a single daily dose.
Frusemide: This is a loop diuretic. It is a very mighty diuretic. It can cause electrolyte and turn depletion more rapidly than other diuretics. It usually causes hypokalemia. Usual mature dose is 10 - 80 mg/time. The duration of action lasts by reason of about 4 hours.
Amiloride: This is a potassium economical diuretic acting on the distal hollow cylinder of Henle. Its diuretic potency is exceedingly limited. It is usually used in alliance with other diuretics in order to minimize potassium injury.
Carbonic anhydrase inhibitors:
Acetazolamide: Is a carbonic anhydrase inhibitor. It causes a retrench in the sodium - hydrogen exchange in the renal tubule inducing diuresis.
Methazolamied: Is not the same carbonic anhydrase inhibitor shown to exist effective in controlling symptoms of Meniere's distemper. This drug is usually administered in doses of 50 mg / light, 5 days a week for 3 months.
Medical ablative therapy:
Aminoglycosides: Ototoxic furniture of aminoglycosides are well documented. Streptomycin and gentamycin are predominantly vestibulotoxic. Intramuscular injections of streptomycin administered two times daily for periods of days to weeks require been used in patients with debilitating in two sides disease / unilateral disease in the excepting that hearing ear. Complete ablation causes disabling oscillopsia. Many authors obtain suggested lower doses and fewer injections to carry out partial ablation, thereby reducing the incidence of sarcastic ataxia. Currently the recommended daily disagreeable lot is 1 g of streptomycin intramuscularly 5 days a week until vestibular ablation occurs as manifested by absence of ice water caloric touchstone. Intratympanic injections of these drugs obtain also been used with success.
Vasodilators:
The practice of vasodilators is based on the model that Meniere's disease results from ischemia of the furrow vascularis. Betahistine has been used with varying degrees of success. This drug can be used for short call control of vertigo and for provisions therapy.
Nicotinic acid is another vasodilator which when administered 30 minutes before meals in doses of 50 - 400 mg helps in resolving the sudden crisis associated with Meniere's indisposition.
Calcium channel blockers:
Nimodepine a highly lipophilic drug is very useful in the therapeutic management of Menierie's disease. It cheerfully crosses the blood brain barrier. This mix with s is useful in patients who be in possession of failed diuretic medical therapy.
ACE inhibitors:
These are same effective vasodilators. These drugs block the rening angiotensin aldosterone body. They produce vasodilatation by blocking angiotensin II induced vasoconstriction.
Lipoflavins and vitamins:
Combination of lipoflavins and vitamins bear been tried as a management modality by varying degrees of success.