Diamox is an FDA-approved medication used to treat certain types of glaucoma, congestive heart failure, certain types of seizures. Diamox also prevents altitude sickness.
Other names for this medication:
Also known as: Acetazolamide.
Diamox contains an active ingredient Acetazolamide, which belongs to class of drugs called carbonic anhydrase inhibitors.
Diamox effectively treats certain types of glaucoma (excessive pressure in the eyes) by reducing the amount of fluid in the eye, and thereby decreases pressure inside the eye.
Acetazolamide acts also as a diuretic ("water pill") and inhibits the protein in the body called carbonic anhydrase. This leads to reducing the build-up of certain fluids in the body, significantly alleviating the symptoms of congestive heart failure.
Acetazolamide is also used to treat certain types of seizures, and to treat or prevent altitude sickness.
Diamox is available in tablets.
The dosage depends on the disease and its prescribed treatmen.
250 mg to 1 gram per 24 hours in 2 or more smaller doses.
In secondary glaucoma and before surgery in acute congestive (closed-angle) glaucoma, the usual dosage is 250 mg every 4 hours or, in some cases, 250 mg twice a day.
The daily dosage is 8 to 30 mg per 2.2 pounds of body weight in 2 or more doses. Typical dosage may range from 375 to 1,000 mg per day.
Congestive Heart Failure treatment:
The usual dosage is 250 mg to 375 mg per day or 5 mg per 2.2 pounds of body weight, taken in the morning.
Diamox can be used by children.
If you want to achieve most effective results do not stop taking Diamox suddenly.
If you overdose Diamox and you don't feel good you should visit your doctor or health care provider immediately.
Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F) away from moisture and heat. Throw away any unused medicine after the expiration date. Keep out of the reach of children.
The most common side effects associated with Diamox are:
Side effect occurrence does not only depend on medication you are taking, but also on your overall health and other factors.
Do not take Diamox if you are allergic to Diamox components.
Be careful with Diamox if you're pregnant or you plan to have a baby, or you are a nursing mother.
Do not take Diamox if your sodium or potassium levels are low.
Do not take Diamox if you have kidney or liver disease, including cirrhosis.
Be careful with Diamox if you suffer from or have a history of emphysema or other breathing disorders.
Be careful with Diamox if you take high doses of aspirin.
Be careful with Diamox if you are taking Amitriptyline, Cyclosporine, Lithium, Methenamine, oral diabetes drugs such as Glyburide, Quinidine.
Do not use potassium supplements or salt substitutes.
If you want to achieve most effective results without any side effects it is better to avoid alcohol.
Do not stop taking Diamox suddenly.
We evaluated 24 children (18 girls and 6 boys) with spontaneous intracranial hypotension (age at onset of symptoms: 2-19 years, mean 14.3 years). Twenty-three patients presented with orthostatic headaches and 1 presented with a nonpositional headache. A generalized connective tissue disorder was diagnosed in 54% of patients. Magnetic resonance imaging showed the typical changes of spontaneous intracranial hypotension in most patients (79%). Spinal imaging demonstrated a cerebrospinal fluid (CSF) leak with or without an associated meningeal diverticulum in 12 patients (50%) and with dural ectasia or meningeal diverticula in 10 patients (42%), and it was normal in 2 patients (8%). Twenty-three patients initially underwent epidural blood patching, but 8 patients also were treated with percutaneous injections of fibrin glue and 11 patients eventually required surgical correction of the underlying CSF leak. There was no morbidity or mortality associated with any of the treatments, but 5 patients required acetazolamide for rebound high intracranial pressure headache. Overall, outcome was good in 22 patients (92%) and poor in 2 patients (8%).
In order to examine the promoting effect of urinary crystals on urinary bladder carcinogenesis, acetazolamide, uracil, and diethylene glycol, all of which have been reported to cause urinary crystals or calculi, were administered to male F344 rats for 32 weeks after pretreatment with 0.05% N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN) for 4 weeks. A marked increase in urinary crystals was observed in acetazolamide-treated rats and a slight increase in crystals was observed in uracil- and diethylene glycol-treated rats. Histological examination of the urinary bladder revealed that the BBN-acetazolamide treatment resulted in a higher incidence of carcinoma than BBN-control. Uracil and diethylene glycol did not cause any significant difference compared to the control. Promoting effects by urinary crystals were not clearly shown in the present experiment and, therefore, urinary crystals appear to play a very limited role, if any, in urinary bladder carcinogenesis.
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The relationship between surface epithelial alkaline secretion and pH at the mucosal cell surface was studied in the duodenum of anesthetized rats. Alkaline secretion was measured by direct titration in situ using perfused segments of duodenum just distal to the Brunner gland area and devoid of pancreatic and biliary HCO3-. Mucosal surface pH was measured by advancing a pH-sensitive antimony microelectrode from the luminal solution to the mucosal cell surface during continuous recording of pH. Acidification of the luminal solution markedly stimulated epithelial alkaline secretion: a change of luminal pH from 7.60 to 5.00 by approximately 100%, and from pH 7.60 to 2.00 by approximately 600%. Maximal pH in the immediate vicinity of the (luminal) cell surface remained at or slightly above neutrality during exposure to both luminal acidities. Prostaglandins (E2, 16,16-dimethyl E2, and F2 alpha, 3-140 microM luminally) increased the rate of alkaline secretion, surface alkalinity, and thickness of the pH gradient. Acetazolamide (40-80 mg/kg, i.v.) was a much more potent inhibitor of prostaglandin or acid-stimulated secretion than of basal alkaline secretion and decreased surface pH in acid-exposed duodenum. Aspirin (30 mg/kg, i.v.) had no effect on basal alkaline secretion (titrated at luminal pH 7.60) but significantly inhibited secretion at luminal pH 2.00, resulting in a decrease of surface pH. These data suggest that endogenous prostaglandins may be involved in mediating the alkaline response to luminal acid. Furthermore, because it is quantitatively sufficient to maintain neutral pH at the mucosal cell surface at luminal acidities normally encountered within the duodenal bulb, epithelial alkaline secretion presumably has an important role in duodenal protection against acid.
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To determine the effects of Carbonic anhydrase inhibition on CO(2) output and ionic exchange between erythrocytes and plasma and their influence on acid-base balance in the pulmonary circulation (across the lung) in exercising horses with and without CA inhibition.
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Most of patients with cerebrovascular disease are associated with hypertension. Hypertension induces progressive atheromatous changes in cerebral arteries, and often causes steno-occlusive lesions of cerebral arteries. Angiotensin converting enzyme (ACE) inhibitor cilazapril is one of the antihypertensive drugs. It was reported that cilazapril improved resting cerebral blood flow (CBF) and cerebrovascular reserve capacity (CRC) in experimental studies. In this clinical study, the authors investigated whether long-term treatment with cilazapril could improve CBF and CRC in patients with steno-occlusive lesions of the major cerebral arterial trunk, measured by stable xenon computerized tomography (Xe-CT) with acetazolamide challenge. On the other hand, CBF and CRC in the calcium blocker-treated patients were measured in the same way. CBF did not change after long-term treatment with both cilazapril and calcium blocker. In the cilazapril-treated group, CRC was increased significantly (p < 0.05). However, CRC did not change in the calcium blocker-treated group. It was recognized that long-term treatment with cilazapril did not decrease CBF and improved CRC in patients with occlusive lesions of the major cerebral arterial trunk.
We have cloned, purified, and characterized an α-carbonic anhydrase (CA, EC 126.96.36.199) from the human pathogenic bacterium Vibrio cholerae, VchCA. The new enzyme has significant catalytic activity, and an inhibition study with sulfonamides and sulfamates led to the detection of a large number of low nanomolar inhibitors, among which are methazolamide, acetazolamide, ethoxzolamide, dorzolamide, brinzolamide, benzolamide, and indisulam (KI values in the range 0.69-8.1 nM). As bicarbonate is a virulence factor of this bacterium and since ethoxzolamide was shown to inhibit the in vivo virulence, we propose that VchCA may be a target for antibiotic development, exploiting a mechanism of action rarely considered until now.
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Carbonic anhydrases (CAs) are essential and ubiquitous enzymes. Thus far, there are no articles on characterization of Drosophila melanogaster α-CAs. Data from invertebrate CA studies may provide opportunities for anti-parasitic drug development because α-CAs are found in many parasite or parasite vector invertebrates. We have expressed and purified D. melanogaster CAH1 and CAH2 as proteins of molecular weights 30kDa and 28kDa. CAH1 is cytoplasmic whereas CAH2 is a membrane-attached protein. Both are highly active enzymes for the CO2 hydration reaction, being efficiently inhibited by acetazolamide. CAH2 in the eye of D. melanogaster may provide a new animal model for CA-related eye diseases. A series of dithiocarbamates were also screened as inhibitors of these enzymes, with some representatives showing inhibition in the low nanomolar range.
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Thirty-eight of 86 participants randomized to the acetazolamide group (44.1%) tolerated the maximum allowed dosage of 4 g/d. The average time to achieve maximum study dosage in the acetazolamide group was 13 weeks (median 12 weeks; range 10-24 weeks). A total of 676 AEs (acetazolamide, n = 480; placebo, n = 196) and 9 serious AEs (acetazolamide, n = 6; placebo, n = 3) were reported. Notably, the percentages of participants reporting at least 1 AE in the nervous, gastrointestinal, metabolic, and renal organ systems were significantly higher in the acetazolamide group (P < 0.05). The odds of paresthesia (OR 9.82; 95% CI 3.87-27.82), dysgeusia (OR ∞; 95% CI 3.99-∞), vomiting and diarrhea (OR 4.11; 95% CI 1.04-23.41), nausea (OR 2.99; 95% CI 1.26-7.49) and fatigue (OR 16.48; 95% CI 2.39-702.40) were higher in the acetazolamide group than in the placebo group.
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MCT1-4 expression was screened by RT-PCR, Western blot analysis, and immunofluorescence. Endogenous lactate efflux and/or pH(i) were measured in BCEC in HCO(3)(-)-free or HCO(3)(-)-rich Ringer, with and without niflumic acid (MCT inhibitor), acetazolamide (ACTZ, a CA inhibitor), 5-(N-Ethyl-N-isopropyl)amiloride (EIPA) (Na(+)/H(+) exchange blocker), disodium 4,4'-diisothiocyanatostilbene-2,2'-disulfonate (DIDS; anion transport inhibitor), or with NBCe1-specific small interfering (si) RNA-treated cells.
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Klotho, a protein expressed mainly in the kidney, is required for the inhibitory effect of FGF23 on renal 1,25(OH)2D3 formation. Klotho counteracts vascular calcification and diverse age-related disorders. Klotho-hypomorphic mice (kl/kl) suffer from severe vascular calcification and rapid aging. The calcification is at least in part caused by excessive 1,25(OH)2D3, Ca(2+), and phosphate concentrations in blood, which trigger osteogenic signaling including upregulation of alkaline phosphatase (Alpl). As precipitation of calcium and phosphate is fostered by alkaline pH, extracellular acidosis could counteract tissue calcification. In order to induce acidosis, acetazolamide was added to drinking water (0.8 g/l) of kl/kl and wild-type mice. As a result, acetazolamide treatment of kl/kl mice partially reversed the growth deficit, tripled the life span, almost completely reversed the calcifications in trachea, lung, kidney, stomach, intestine, and vascular tissues, the excessive aortic alkaline phosphatase mRNA levels and the plasma concentrations of osteoprotegerin, osteopontin as well as fetuin-A, without significantly decreasing FGF23, 1,25(OH)2D3, Ca(2+), and phosphate plasma concentrations. In primary human aortic smooth muscle cells, acidotic environment prevented phosphate-induced alkaline phosphatase mRNA expression. The present study reveals a completely novel effect of acetazolamide, i.e., interference with osteoinductive signaling and tissue calcification in kl/kl mice.
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In groups of white Wistar rats, the cytoprotective effect induced by TDB on the gastric mucosa against the ethanol injury, was studied; where macroscopic protection and histologic cytoprotection in gastric corpus was found, and no in antrum mucosa. The cytoprotective mechanism give by TDB, were studied by the test of Indomethacin, Cl2Hg, Domperidone, Chlorpromazine and Acetazolamide, where each drug was given as pretreatment. Was conclude that TDB give gastric cytoprotection by the mechanism of the nonprotein sulfhydryl, by to be one peripheral agonist of the neuronal dopamine receptors, by increase of endogenous prostaglandin, by little increment of cAMP and no participate the gastric bicarbonate secretion.
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Five sulfonamide inhibitors of carbonic anhydrase inhibited parathyroid hormone-induced resorption of bone in organ culture. The relative activities of the sulfonamides as resorption inhibitors were such as to suggest the presence of a functional carbonic anhydrase system in bone linked to the mechanism of bone resorption.
Intraventricular hemorrhage remains a serious complication of premature birth and post hemorrhagic hydrocephalus still has no satisfactory treatment. Acetazolamide and furosemide, which both reduce the production of cerebrospinal fluid, have been suggested as non-invasive therapies to reduce hydrocephalus and the need for ventriculo-peritoneal (V-P) shunting.
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1. Alkaline extracellular pH transients evoked by afferent stimulation, and local pressure ejection of glutamate and gamma-aminobutyric acid (GABA), were studied in the CA1 region of rat hippocampal slices. Amino acid-evoked responses were obtained by use of a dual micromanipulator, with the tip of a double-barreled pH-sensitive microelectrode positioned 50 microns from a pressure ejection pipette. 2. At 31 degrees C, in Ringer solutions buffered with 26 mM HCO3- and 5% CO2, mean extracellular pH in submerged 300-microns slices was 7.15 +/- 0.12 (n = 27 slices), at a tissue depth of approximately 150 microns. In Ringer buffered with 35 mM HCO3- and 5% CO2, extracellular pH was 7.29 +/- 0.10 (n = 19 slices). 3. Repetitive stimulation of the Schaffer collaterals caused an extracellular alkaline shift in stratum oriens, pyramidale, and radiatum, averaging 0.05 +/- 0.03 pH units among all regions (n = 138), with a maximum response of 0.16 pH units. Alkaline transients of similar appearance were obtained by local ejection of glutamate (0.01-0.12 pH units, n = 110) and GABA (0.01-0.18 pH units, n = 137). Control ejection of these amino acids into dilute agar caused only small acid shifts. 4. Superfusion of 100 microM picrotoxin abolished the GABA-evoked alkaline shift but failed to inhibit the Schaffer collateral- and glutamate-evoked alkalinizations. 5. Superfusion of 10(-5)-10(-3) M acetazolamide acidified the baseline by 0.05-0.10 pH units and amplified the Schaffer collateral- and glutamate-evoked alkaline shifts.(ABSTRACT TRUNCATED AT 250 WORDS)
A 78-year-old white man with vascular disease developed ocular hypotony, bullous ciliochoroidal detachments, and suprachoroidal haemorrhage, secondary to medical treatment with acetazolamide and betaxolol, which resolved on withdrawal of these medications. This phenomenon does not appear to have been described in patients without prior intraocular surgery. It is likely that a compromised ciliary vasculature may result in increased sensitivity to aqueous suppressants, leading to profound hypotony, choroidal detachments, and haemorrhage.
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Age-related norms for the regional cerebral blood flow (rCBF) response to Diamox (acetazolamide) were based on studies of 55 normal subjects at rest and on studies of 33 of these 55 normal subjects following an intravenous injection of Diamox (22 mg/kg). After the Diamox injection, rCBF increased at all locations measured in all subjects. On average, rCBF increased 1.7 times. The following were found for rCBF in both resting and Diamox-treated subjects: 1) rCBF decreased significantly with increasing age; 2) slope and intercept for the regression of rCBF on age were largest for frontal detectors, intermediate for parietal detectors, and smallest for occipital detectors; 3) rCBF hyperfrontality was most noticeable in younger subjects; 4) in subjects of any age, 95% confidence intervals for rCBF were relatively large (expected value +/- 30%) and lower 95% confidence intervals for Diamox rCBF tended to overlap the upper 95% confidence intervals for resting rCBF; and 5) side-to-side percentage difference in rCBF did not have a significant regression on age and tended to be less than 10% to 20%. Diamox did not have an important effect on blood pressure, pulse rate, or respiratory rate. The normative data for the rCBF response to Diamox was used in evaluating 20 patients with cerebrovascular disease. Forty percent of these patients, all of whom exhibited angiographic evidence of potentially hemodynamically significant lesions, had normal rCBF at rest and after Diamox injection. Twenty percent had normal resting flows with abnormal Diamox-activated flows. Asymmetry in rCBF was the most sensitive indicator of a potential abnormality in cerebral perfusion. Thirty percent of the abnormal studies showed only significant asymmetry. It is suggested that rCBF studies at rest and after Diamox treatment, with age-related norms, may be useful in the management of patients with cerebrovascular disease.
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We investigated the involvement of the enzyme, carbonic anhydrase, in the calcification-decalcification processes occurring in the posterior caeca of the midgut of the terrestrial crustacean, Orchestia cavimana, before and after exuviation. This enzyme was ultrahistochemically localized throughout the membranes of the caecal epithelium as well as extracellularly, i.e., within pre-exuvial calcareous concretions and postexuvial calcified spherules. During the molt cycle, the pattern of carbonic anhydrase activity in the posterior caeca was correlated with the calcium content at this level. Acetazolamide treatment in vivo inhibited about 50% of the calcium uptake during both pre-exuvial secretion and postexuvial reabsorption. The role of carbonic anhydrase in this mineralizing-demineralizing epithelium is discussed and compared with that of other mechanisms involved in this calcium turnover.
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The data of this preliminary study suggest an important role of impaired cerebral vasomotor reactivity in predicting ischemic cerebral events. Preventive vascular surgery might be considered in this high-risk subgroup of asymptomatic patients with severe carotid stenosis.
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Four of the patients had MEM with lactic acidosis and strokelike episodes (MELAS), 2 had Kearns-Sayre syndrome (KSS), 1 had myoclonic epilepsy with ragged red fibers (MERRF) and 3 had cytochrome C oxidase deficiency (CCOD). Cerebral perfusion reserve was obtained from 6 patients (3 MELAS, 1 MERRF, 1 KSS, 1 CCOD) for a comparative analysis using the split-dose 123I-IMP SPECT method before and after the injection of acetazolamide.
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A high performance liquid chromatographic assay for the quantitation of acetazolamide in both tablet and injection form is described. Acetazolamide is extracted with 0.005 M NaOH solution containing 0.3 mg/mL sulphadiazine (internal standard). A commercially available mu-Bondapak C18 cartridge column was used for the separation together with a mobile phase made of acetonitrile, methanol and sodium acetate buffer mixture (10:2:88) (pH 4) at a flow-rate of 4 mL/min. Retention times of about 2.50 and 3.36 min were obtained for the drug and the internal standard, respectively.
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We did not find changes in the diameter of the MCA after acetazolamide provocation testing with high-resolution MR imaging in patients with occlusive extracranial carotid artery disease.
Thirteen patients in whom extensive craniectomies had been performed underwent a meticulous study of blood flow velocities in the middle cerebral artery (MCA) and extracranial internal carotid artery (ICA), as assessed by transcranial Doppler ultrasonography during postural maneuvers (supine and sitting positions) and during stimulation with 1 g of acetazolamide for the interpretation of CVR capacity. Twelve patients underwent 18-fluorodeoxyglucose positron emission tomography. These measurements were obtained before and 7 days after cranioplasty. Cranioplasty improved preoperative differences in MCA blood flow velocities when comparing those in the injured with those in the uninjured hemisphere. Similarly, cranioplasty resolved decreases in extracranial ICA blood flow in the injured hemisphere that were induced by postural changes, which was a constant finding prior to this procedure. More strikingly, however, the CVR capacity, which was severely impaired in both hemispheres, increased significantly after the procedure. Metabolic deficits, which were observed in the injured hemisphere, were found to improve after reimplantation of the skull bone flap.
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Cerebral blood flow velocity was measured by transcranial Doppler sonography at rest and during cerebral vasodilatation evoked with acetazolamide in 14 patients before and after carotid endarterectomy. Before surgery the vasoreactivity in the affected middle cerebral artery territories was reduced and abnormal (asymptomatic side: 35.9 +/- 25.6% [mean +/- SD; n = 14]; symptomatic side: 25.6 +/- 10.7%), but the difference between the two hemispheres was not significant however, vasoreactivity was normalized 5 days after surgery (asymptomatic side: 46.9 +/- 22.3% symptomatic side: 58.9 +/- 23%) (p < 0.001). The increase in cerebral reserve capacity and changes in Gosling's index of pulsatility correlated significantly in both hemispheres (p < 0.02). This findings indicate an improved perfusion reserve on the fifth day following carotid endarterectomy in patients with an internal carotid artery diameter reduction of at least 70%.
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Acetazolamide was more effective than spironolactone in preventing AMS (OR = 0.28, 95% CI 0.12-0.60, p < 0.01). Spironolactone was not significantly different from placebo in the prevention of AMS. AMS incidence for placebo was 20.3%, acetazolamide 10.5%, and spironolactone 29.4%. Oxygen saturation was also significantly increased in the acetazolamide group (83% ± 0.04) vs spironolactone group (80% ± 0.05, p < 0.01).
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To characterize CACNA1A mutations, eight familial and seven sporadic EA2 patients were selected. All 47 exons of CACNA1A were screened by a combination of single-strand conformer polymorphism and sequencing analysis. In addition, the length of the CAG repeat has been determined in all patients.
Existence of an internal carbonic anhydrase was demonstrated in the cyanobacterium Synechocystis PCC 6714. The enzyme, present at a low specific activity, was inducible by limitation in inorganic carbon and inhibited both in vivo and in vitro by acetazolamide. The internal inorganic carbon pool as determined by mass spectrometry, was similarly modulated by the actual inorganic carbon growth regime; its building up was also sensitive to acetazolamide. A possible role of carbonic anhydrase in inorganic carbon metabolism regulation through the control of the dimension and nature of the inorganic carbon pool is discussed.
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The goal was to determine the influence of the degree of internal carotid artery (ICA) stenosis and collateral pathways on cerebral vasoreactivity (CVR). The effect of carotid endarterectomy on CVR is also presented.
Vasomotor reactivity was not affected by the presence of a contralateral internal carotid artery stenosis. Both vasodilatory stimuli similarly indicated poor vasomotor reactivity when an ophthalmic or a leptomeningeal pathway accompanied an anterior communicating artery pathway compared with a lone anterior communicating artery pathway (P < .05). The acetazolamide challenge indicated significantly better preserved vasomotor reactivity when blood supply was provided through a lone anterior communicating artery pathway (66 +/- 30%) than through an anterior and posterior communicating artery pathway (33 +/- 20%, P < .05), whereas the breathholding method failed to show such a difference.
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We speculate that asymptomatic IIH may be more common in young children and could represent a milder form or a presymptomatic phase before evolving into classic symptomatic IIH. Further studies to assess the clinical significance of asymptomatic IIH are warranted.
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