A immature male presented with easy fatigability, anorexia, sickness of 06 hebdomads continuance with little intestine diarrhoea of four yearss continuance. After resuscitation with IV fluids he had a ictus, altered sensorium, acute oncoming quadriparesis, dysphagia and muteness. He was found to hold advanced nephritic failure with shrunk kidneys and managed with hemodialysis with good betterment in degree of sensorium, nevertheless other neurological symptoms had persisted. Further neurological rating revealed an interesting iatrogenic cause for the quadriparesis. Patient made gradual recovery from the neurological syndrome over the ensuing hebdomads but continued to be dialysis dependent.

An 18 twelvemonth old male presented with anorexia, purging, unease and easy fatigability of 6 hebdomads continuance. He gave history of loose watery stools of 4 yearss continuance. He had been oliguric and had been in altered sensorium for 1 twenty-four hours prior to presentation. No h/o fever, haematurias, dysuria, pyuria, swelling of face or pess, yellowing of eyes or urine / hemetemesis, pain venters or distention of venters, chest hurting / dyspnoea on exertion/ orthopnea, usage of any drugs or Terbium in the yesteryear.

What is your analysis of symptoms so far?

This immature adult male has an implicit in chronic upset, the nature of which is ill-defined due to nonspecific symptoms. The possible differential diagnosing could be – chronic hepatitis, endocrinal upsets like Addison ‘s, HIV infection, azotemic symptoms. The present job is an episode of little intestine diarrhea that has resulted in volume depletion and oliguria suggestive of acute kidney hurt. The cause of altered sensorium could be hypovolaemic or infected daze, dyselectrolytemia or azotemic brain disorder. Tropical infections like terrible malaria should besides be kept in head in a immature patient with short history of diarrhea, altered sensorium and nephritic failure, nevertheless, absence of febrility would be an uneven point.

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He was managed with 12 bottles of IV fluids as per the attender ‘s history. He had an episode of GTCS and continued to be in altered sensorium. He started holding trouble in take a breathing and inability to bring forth sound. He was noticed non to be traveling all 4 limbs and hence was shifted to a referral infirmary.

What could be the cause of trouble in external respiration, altered sensorium and inability to travel all four limbs in this patient?

Trouble in external respiration could be due to fluid overload, aspiration in a patient with altered sensorium or ARDS. The altered sensorium in this clinical scenario could be due to a

* MD, DNB, DM ( Nephro ) , Reader in Medicine, Dept of Medicine, AFMC.

E mail: jairam_07 @ yahoo.co.in Tele: 020-26306012 ( O ) , 9545081656 ( M )

metabolic cause like hyponatremia, hypoxia, sepsis, uremia or CNS infection. The ground he is non traveling his limbs could be postictal sleepiness, basilar arteria thrombosis, osmotic demyelination, or post-para infective demyelination.

What are the causes of acute oncoming quadriparesis?


Cervical cord – Acute Compressive

Myelopathy and Non compressive myelopathy

Basilar arteria thrombosis

Cardinal pontine myelinolysis






Arsenic toxic condition

Tick palsy


Elapid Snake bite

Hypokalemic Periodic palsy

Myasthenis gravis – crisis

He was shifted to a referral infirmary in position of his deteriorating status. Evaluation revealed anaemia ( Hb-5 gram % ) , azotemia ( Urea-171 milligram % , Cr- 15 mg % ) and bilateral shrunken kidneys on ultrasound ( RK-6.8cm, LK-5.5cm ) . He was managed with twice hebdomadal haemodialysis through subclavian catheter. Diarrhoea subsided within two yearss of admittance.

What could be the cause of nephritic failure in this patient?

In position of the bilateral shrunk kidneys, he has chronic kidney disease that history for the azotemic symptoms of 6 hebdomads continuance. A prerenal constituent due to the volume depletion from acute stomach flu would hold resulted in ague on chronic nephritic failure. The differential diagnosing of acute nephritic failure after diarrhea should besides include hemolytic azotemic syndrome, nevertheless bilateral shrunk kidneys would govern out the possibility.

What are the causes of chronic nephritic failure in childhood?

Inherited cystic kidneys


Congenitally maldeveloped kidney


Reflux kidney disease

Posterior urethral valves

Obstructive uropathy

PUJ obstructor, UVJ obstr

Inherited Glomerular disease

Alport ‘s, Inherited podocytopathies

Metabolic disease

Primary Hyperoxaluria, Fabry ‘s


Lupus, Primary and secondary glomerulopathies

The patient continued to hold failing of all 4 limbs with no betterment in power. Weakness of limbs was symmetrical, affecting both proximal and distal muscular structure. He remained dependent for activities of day-to-day life. However, the degree of sensorium improved with dialytic support over 2 hebdomads. He started to react to verbal bids but remained bed edge. Patient was unable to get down both solid and fluids. He was unable to talk or vocalize although comprehension was integral. There was no history of regurgitation or choking. He was on ryle ‘s tubing eating. He was on foley ‘s catheter for urinary drainage and his urine end product was equal. No h/o fever, haematurias, dysuria, swelling of face/feet, any episodes of failing in past, icterus, usage of any drugs in the past, joint hurting or roseolas, dogbite or inoculation, exposure to insect powders.

What are the clinical possibilities at the terminal of history?

The patient has an ague on preexistent CKD. The acute factor is enteritis with possibly sepsis. The euderlying cause of CKD is perchance chronic interstitial Bright’s disease. He likely had azotemic or metabolic brain disorder that improved improved with hemodialysis. The neurological diagnosing at the functional degree would be acute onset flaccid quadriparesis, muteness and dysphagia. The anatomical localization of function would be Ponss with engagement of corticospinal and bulbar piece of lands. The cause could be osmotic demyelination due to rapid rectification of hyponatremia in the scene of hypovolaemic hyponatremia. Alternatively, the patient could hold suffered from a pontine infarction due to terrible desiccation.

On scrutiny, he was averagely built and nourished with a weight 48Kg, height 156cm and BMI19.6 kg/m2. He was Afebrile with pulse 110/min, BP 110/60 millimeter Hg and respiratory rate18/min. He had lividness but no hydrops, jaundice, clubbing or lymphadenopathy. Nervous system rating revealed a witting with GCS 11/15 ( E4V1M6 ) . He was tongueless but obeying verbal bids. Students were equal size and responding to visible radiation. The horizontal conjugate oculus motions were restricted with normal perpendicular motions. There was no nystagmus or facial dissymmetry and jaw dork was non elicitable. He had decreased palatine motions, diminished joke physiological reaction with normal lingua motions. Motor system scrutiny revealed normal majority, hypertonus in all limbs, with power 2/5 in both upper limbs with handgrip 60-70 % . The power in hips and articulatio genuss was 3/5. All the deep sinew dorks were alert with bilateral mortise joints clonus and extensor plantars and no centripetal shortage. The scrutiny of lungs, venters and CVS revealed no abnormalty.

What is the difference between coma, Locked in syndrome, vegetive province and akinetic muteness? Which of these conditions is our patient hold?

Coma means a down degree of watchfulness to finish unresponsiveness and is rating as per Glasgow coma graduated table. “ Locked in syndrome ” refers to a deaf-and-dumb person and motionless but remains awake, watchful, cognizant of ego, and capable of comprehending centripetal stimulations. A patient with akinetic muteness – although apparently awake, remains soundless and motionless. Persistent vegetive province is a deficiency of consciousness of ego and external stimulations, accompanied by slumber and aftermath rhythms, with saving of critical vegetive maps. Our patient is in a “ locked in province ” because he is witting and is reacting to verbal stimulation, but remains tongueless, quadriplegic with integral perpendicular motions.

What are the causes of Locked in syndrome?

The causes of a locked in syndrome would be – Basilar arteria thrombosis with ventral pontine infarction, pontine bleeding, pontine tumour, osmotic demyelination syndrome and seldom – bilateral ventral mesencephalon lesions and tentorial herniation.

Probes revealed Hb 6.2g/dl, TLC 30400/mm3, DLC P82 % L15 % , thrombocyte 2.64 lakh/ , Bl sugar 99mg/dl, Serum bilirubin 0.9mg/dl, normal aminotransferases, Bl urea 180mg/dl, serum creatinine 8.0 mg/dl, Serum sodium 134 mol/L, Serum K 3.4 mmmol/L. Peripheral blood vilification showed toxic granules, Blood civilization and urine civilization revealed no growing, Viral markers HbsAg and anti-HCV were Neg and HIV was Non reactor. CT encephalon showed diffuse hypodensities affecting Ponss, mesencephalon, widening into in-between and superior cerebellar peduncle, intellectual peduncle and bilateral station limb of internal capsule. MRI encephalon showed big countries of altered signal strength within Ponss every bit good as mesencephalon widening to posterior limbs of internal capsule suggestive of osmotic demyelination. The patient was managed as a instance of ESRD with Biweekly MHD and supportive attention. His neurological position improved bit by bit over 2 -3 hebdomads and was able to get down, phonate and ambulate with support.

What are the clinical scenes associated with osmotic demyelination?

Multiple clinical scenarios affecting rapid rectification of hyponatremia consequences in osmotic demyelination. These are as shown in the tabular array below.

Common associations

Chronic hepatocellular disfunction


Chronic alcohol addiction

Liver organ transplant



Addison ‘s

Chronic nephritic failure

Uncommon associations

Dialysis dysequilibrium

Normonatremic desiccation

Correction of hyponatremia with normal saline

Correction of hyponatremia with H2O

limitation entirely


Hyponatremia with associated hypokalemia


What is the pathogenesis of osmotic demyelination syndrome?

As an version to chronic hyponatremia there is a loss of intracellular osmolytes ( Na, K, chloride, and organic osmolytes such as myoinositol, glutamate, taurine, glutamine ) from the encephalon cells to forestall intellectual hydrops. Rapid rectification of chronic hyponatremia corrects the tonus of blood but the encephalon cells are hypotonic ; this leads to sudden shrinkage of cells and loss of medulla. Grey matter- white affair interface is maximal in the ventral Ponss and hence rapid displacements in osmolarity consequence in myelinolysis particularly in the part of Ponss, therefore the old term- “ Central pontine myelinolysis ” . Today it is good known that loss of medulla may happen from extrapontine sites excessively, therefore the enitity has been termed “ Osmotic demyelination syndrome ” .

What are the steering rules in the rectification of hyponatremia in order to forestall osmotic demyelination?

Rapid rectification of even mild hyponatremia carries the hazard of osmotic demyelination. Na should be corrected no faster than 0.5 meq/l/hour and non more than 10 meq/l/24 hours. Hypertonic saline should be used merely if clinically warranted. The intervention of mild symptomless hyponatremia ( plasma Na & gt ; 120 meq/l ) needs merely halting hypotonic fluid therapy and withholding water pills. In hypovolaemic patients rectification with isosmotic saline will normally rectify hyponatremia if adrenal map is normal. In hypervolemic patients, in whom dilutional hyponatremia is due to renal Na keeping, H2O limitation combined with intervention of the implicit in upset ( bosom failure, cirrhosis, nephrotic syndrome ) is frequently successful. In euvolemic patients, intervention is directed at the cause ( e.g. adrenal inadequacy, hypothyroidism ) . If SIADH is present, terrible H2O limitation ( 250-500ml/24hrs ) is required.

The hazard of osmotic demyelination syndrome is increased in chronic hyponatremia due to the intellectual version to the chronic hypo-osmolar province. In chronic symptomless hyponatremia, the plasma Na should be raised non more than 5 – 8 meq/L/d to avoid osmotic demyelination syndrome. Severe symptomless hyponatremia can normally be treated with rigorous limitation of H2O consumption.

All diagnostic patients with acute hyponatremia, for hyponatremia associated with implicit in neurologic or neurosurgical conditions, exercising induced hyponatremia and for all hyponatremic patients with ictuss or coma regardless of the continuance of the electrolyte perturbation should be treated with a bolus extract of 100 milliliter of 3 % NaCl to acutely cut down encephalon hydrops with up to 2 extra 100 mL 3 % NaCl bolus extracts that should be given at 10-minute intervals if there is no clinical betterment. Hypertonic saline ( 3 % saline ) should be used merely with frequent electrolyte findings ( every 2-4 hr ) . Once the bolus therapy has been completed, further intervention with hypertonic saline may be unneeded. This regimen translates to a upper limit of 6 mL/kg of 3 % saline in a 50-kg adult female, plenty to increase the serum Na concentration by 5 to 6 mmol/L.

What are the safe rates of rectification of terrible diagnostic hyponatremia?

The bounds of rate of rectification laid out are: 10 mmol/L in 24 hours, 18 mmol/L in 48 hours, and 20 mmol/L in 72 hours. These should be regarded as bounds non to be exceeded instead than curative ends. The end of therapy should be equal to maintain patients safe from serious complications of hyponatremia while remaining good clear of rectification rates that risk iatrogenic hurt. Consequently, the suggested ends are: 6 to 8 mmol/L in 24 hours, 12 to 14 mmol/L in 48 hours, and 14 to 16 mmol/L in 72 hours. For the first 2-3 hours of intervention, rate non transcending 1mmol/l/h has been suggested, but for patients with ictuss rates upto 2mmol/L/h has been suggested. The slower rate of rectification is much less critical in ague ( & lt ; 2 yearss in development ) diagnostic hyponatremia, though immediate attainment of normonatremia is non suggested.

In a given instance how is the sum of Na to be infused calculated?

The sum of Na in milliequivalent may be calculated by utilizing the expression:

Na shortage = ( Desired alteration in Na ) x TBW, where TBW is 0.6 ten organic structure weight in kilogram in work forces and 0.5 tens organic structure weight in kilogram in adult females. An alternate method of ciphering the demand is by usage of the Adrogue Madias expression that predicts the addition in Na degree.

Expected addition in serum Na with 1L infusate = Infusate Na-Serum Na

TBW +1

The usage of anticipation expression tends to ensue in accidental overcorrection. Once the damage resolves, elimination of dilute piss increases the serum Na concentration by much more than would be predicted by computations that ignore this factor.

Concluding diagnosing – Osmotic demyelination syndrome in terminal phase nephritic disease


Osmotic demyelination syndrome is an iatrogenic complication of inappropriate rectification of hyponatremia. Previously described as cardinal pontine myelinolysis, it has been good described in other excess pontine sites excessively. With the widespread handiness of MRI the status has been recognized as non an uncommon status. Osmotic demyelination due to rectification of hyponatremia in the scene of nephritic disease has been described, but is comparative ; ly uncommon. Appropriate rectification of hyponatremia, lodging to the laid down rules can travel a long manner in forestalling this upset.

Take Home Message

1. A high index of intuition in typical clinical scenes can pick up cases of osmotic demyelination syndrome early.

2. One needs to exert due cautiousness in rectifying hyponatremia to forestall osmotic demyelination syndrome.


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