dka and hhs
TRANSCRIPT
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Diabetic KetoacidosisHyperglycemic Hyperosmolar
State
Dr. Soumar DuttaPG Trainee
Accident and Critical Care Medicine
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Diabetic KetoacidosisDiabetic Ketoacidosis
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IntroductionIntroduction
• Acute life threatening complication of DM
• DKA predominantly seen in type 1 DM
• DKA represents body’s response to cellular starvation due to insulin deficiency & counter regulatory hormone excess
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DKADKA
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ClassificationClassification
Mild DKA Moderate DKA Severe DKA
Plasma glucose > 250 mg/dl > 250 mg/dl > 250 mg/dl
Arterial ph 7.25-7.30 7.0-7.24 < 7.0
Serum bicarbonate 15-18 10-<15 < 10
Urine ketones + + +Anion gap >10 >12 >12
Alteration in sensorium alert alert/drowsy stupor/coma
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Pathophysiology of DKA Pathophysiology of DKA
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• Facilitate uptake of glucose & conversion into glycogen• Inhibits glycogenolysis & gluconeogenesis
• Increase lipogenesis• Inhibit lipolysis
• Uptake of amino acids into muscle cell• Prevents release of amino acids from muscle
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PathophysiologyInsulin Deficiency is the primary defect in patients with DKA
Muscle Hepatocyte Adipose
Glucose
AminoAcids
Glucose-P
Glycogen
Pyruvate, CO2
Glucose
FreefattyacidsKetoacids
Normal Insulin Activity
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Pathophysiology
Insulin
GlucagonEpinephrine
CortisolGrowth Hormone
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Pathophysiology
Decreased Glucose UtilizationLipolysis
Insulin
GlucagonEpinephrine
CortisolGrowth Hormone
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DKA - EarlyDKA - Early
• Relative Insulin Deficiency• Glycogenolysis & gluconeogenesis• Peripheral glucose uptake
Elevates blood glucose
Decreased Utilization post-prandial
and Stress-Induced
hyperglycemia
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Pathophysiology
GluconeogenesisGlycogenolysis
LipolysisKetogenesis
InsulinGlucagon
EpinephrineCortisol
Growth Hormone
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• Insulin Deficiency
GlycogenolysisGluconeogenesisHepatic glucose outputLipolysis: Release FFA -> liver VLDL & ketones Ketonemia and hyper TG
Acidosis , Hyperglycemia & Osmotic diuresis
DKA - LateDKA - Late Increased Production &Decreased Utilization Fasting hyperglycemia
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Islets of Langerhans
-cell destruction Insulin Deficiency
Adipo-cytes
Muscle
Liver
Decreased Glucose Utilization &Increased Production
GlucagonIncreasedProtein
CatabolismIncreasedKetogenesisGlucoaneogenesis,Glycogenolysis
IncreasedLipolysis
HyperglycemiaKetoacidosis
HyperTG
PolyuriaVolume Depletion
Ketonuria
AminoAcids
FattyAcids
StressEpi,Cortisol
GH,Glucagon
Threshold180 mg/dl
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Precipitating factors of DKAPrecipitating factors of DKA
• Omission or reduced daily insulin injection• Infection• Pancreatitis• Myocardial Infarction• Mesentric Ischemia• Renal Insufficeincy• CVA
• Pulmonary embolism• G I hemorrhage• Heat related illness• Parenteral/enteral
alimentation• Rhabdomyolysis• Severe Burns
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Drugs Precipitate DKADrugs Precipitate DKA
• Diuretics• Lithium• Beta Blockers• Mannitol• Chlorpromazine• Cimetidine
• Glucocorticoids• Neuroleptics• Phenytoin• Didanosine• Calcium-channel
blockers• Pentamidine
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Clinical featuresClinical features
Hyperglycemia
Osmotic diuresis and renal loss of Na, K, PO4, Ca and Mg
Hypovolemia,acidosis and hyperventilation
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Clinical featuresClinical features
• Increased PGI2 and PGE2peripheral vasodilation ,nausea, vomiting and abdominal pain.
• Vomiting maladaptive response to counter acidosis exacerbates the potassium losses
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Signs of DKASigns of DKA
• Dehydration• Hyperventilation• Ketotic breath• Tachycardia and hypotension• Disturbed conscious state and shock
• Alteration of consciousness correlate better with elevated serum osmolality (>320 mOsm/L) than with severity of metabolic acidosis
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SymptomsSymptoms
• Polyuria
• Polydipsia
• Nausea and vomiting
• Abdominal Pain
• Breathing difficulty
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Lab InvestigationsLab Investigations
• Serum glucose• Serum electrolytes• Complete blood count• Renal function test• Serum & urine ketones• Blood gas analysis
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Lab InvestigationsLab Investigations
• Blood cultures• Sputum collection • Urine analysis & Culture• Liver function tests & Coagulation profiile• Cardiac enzymes• Thyroid function tests• Toxicological Screening
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RadiologyRadiology
• Chest X ray
• ECG
• USG Abdomen
• CT Head
• Lumbar Puncture
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Corrected SodiumCorrected Sodium
Measured Na + 1.6 (Glucose-100)
100•Na+ depressed 1.6 mEq/L per 100 mg% glucose rise above 100 mg/dl.
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Corrected SodiumCorrected Sodium
Example:Na+ = 123 meq/L and Glucose = 1,250 mg/dl
Measured Na + 1.6 (Glucose-100) 100
= 123 + 1.6 (1250-100) 100Corrected Na+ = 123 + 18 = 141 meq/L
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Serum OsmolaritySerum Osmolarity
2(Na) + Glucose + BUN 18 2.8
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D/D
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Management of DKAManagement of DKA
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Goals of TreatmentGoals of Treatment
• Volume Repletion• Reversal of metabolic consequences of
insulin insufficiency• Correction of acid-base & electrolyte
imbalances• Recognition & Treatment of precipitating
causes• Avoidance of complications
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Management of DKAManagement of DKA
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Approach to therapyApproach to therapy
• Correcting the hyperosmolar state and dehydration is the initial aim of therapy.
• Insulin therapy should be undertaken only after the patient is stable hemodynamically.
Glucose and H2O
H2O lost in urine Loss of ECF, vascular collapse and death
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Fluid ResuscitationFluid Resuscitation
• Single most important step• Fluid deficit around 100ml/kg (5-10L)• Helps in Restore I/V volume• Perfuse vital organs• Increase GFR• Decrease serum Glucose & Ketone levels• To restore normal tonicity
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Fluid balance in diabeticFluid balance in diabetichyperosmolarityhyperosmolarity
ECF = 14 L ICF = 28 L
H2O
ECF ICF
H2O
Osmotic Diuresis
Osmotic Diuresis ECF hyperosmolar from ICF autotransfusion
ECF and ICF both hyperosmolar
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Fluid ResuscitationFluid Resuscitation
• NS most frequently administered fluid• 1 litre in 30 min• 2 litres in 2 hours• 2 litres in 2-6 hours• 2 litres in 6-12 hours
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Fluid ResuscitationFluid Resuscitation
• 2–3 L of 0.9% saline over first 1–3 h (10–15 mL/kg per hour)
• 0.45% saline at 150–300 mL/h; change to 5% glucose and 0.45% saline at 100–200 mL/h when plasma glucose reaches 250 mg/dl.
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Fluid ResuscitationFluid Resuscitation
•CVP guided fluids should be considered for elderly & those with heart disease
•Excess fluid may lead to ARDS & cerebral edema
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Insulin therapyInsulin therapy
Mechanism of Action:
• Inhibit gluconeogenesis, lipolysis, catabolic
hormone secretion, production of ketoacids
• Promote potassium, glucose & phosphate
uptake in tissues
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Insulin therapyInsulin therapy
• Ideal way to administer insulin by continuous infusion of small doses of regular insulin 0.1unit/kg/hr once hypokalemia is excluded.
• I/M or S/C administration of regular insulin should be avoided as insulin absorption may be erratic in volume depleted & vasocostricted patient
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Insulin therapyInsulin therapy
• Goal is to decrease Glucose by 50-75mg/dl/hr.50-75mg/dl/hr.
• Infusion should continue until anion gap normalized
• S/C insulin should bridge for atleast one hour before discontinuation of I/V insulin
• Insulin administration should be W/H if K <3.3 mEq till K is supplemented
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DKA: Switch to S.C. insulinDKA: Switch to S.C. insulin
Can consider switch to SC insulin when:
• AG normalized• BS < 250 mg/dl• Insulin IV requirements < 2U/h• Patient able to eat• Hemodynamically stable
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DKA: Switch to S.C. insulinDKA: Switch to S.C. insulin
• Overlap insulin IV with 1st SC insulin by 2-4h to avoid recurrent ketosis
• T2 DM patients with DKA:• Don’t necessarily have to be continued on
insulin• Once acute stress resolved, many do well on
OHA
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Potassium CorrectionPotassium Correction• K+ defecit: 3-5 mEq/Kg (350 mEq for 70Kg)• Normal to high serum K+
K+ K+H+ H+
Ketoacidosis
Insulin
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Potassium CorrectionPotassium Correction
• Deficiency is due to
• Decreased insulin levels• Metabolic Acidosis• Osmotic Diuresis• Frequent Vomitting
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Goal of K ReplacementGoal of K Replacement
• To maintain a normal extracellular K+ conc during
the acute phase of therapy and to replace intra-
cellular deficits over a period of days
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K SupplementationK Supplementation
Serum Potassium < 3 mEq/L Give 60mEq/l to IVF
3-3.9 mEq/L 40mEq/l to IVF
4-5.4 mEq/L 20 mEq/L to IVF
> 5.5 mEq/L No Replacement necessary
Verify Normal kidney function & Urine output before treatment
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BicarbonateBicarbonate
• Routine use of supplemental bicarbonate in
Rx of DKA is not recommended
• Can be given if PH Is less than 6.9
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ADA RecommendationADA Recommendation
If PH 6.9-7.0 50mEq of NaHCo3+200ml sterile water+10mEq KCl over 1 hour
If Ph <6.9 100mEq of NaHCo3+400ml sterile water+10mEq KCl over 2 hours
Repeat dose of bicarb every 2 hours till PH>7
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Theoretical AdvantagesTheoretical Advantages
• In case of severe acidosis
• Improve myocardial contractility
• Improve catecholamine tissue response
• Decrease work of breathing
• In case of Hyperkalemia
• Elevate ventricular fibrillation threshold
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DisadvantagesDisadvantages
• Severe & worsening hypokalaemia
• Paradoxical CNS acidosis
• Impair oxyhemoglobin dissociation
• Hypertonicity
• Sodium overload
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DisadvantagesDisadvantages
• Delayed recovery from ketosis
• Elevation of lactic levels
• Precipitation of cerebral edema / Pulmonary
edema
• Thrombophlebitis
• Require Central venous cannulation
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HypophosphatemiaHypophosphatemia
• Most severe 24-48 hours after treatment• Treatment If Levels <1.0 mg/dl• C/F
• Hypoxia• Rhabdomyolysis• Hemolysis• Respiratory failure• Cardiac Dysfunction
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HypophosphatemiaHypophosphatemia
• IV (K2PO4 ) : 1ml/hr. (4.4 mEq potassium + 93 mg
phosphate )
• S/E• Hyperphosphatemia• Hypocalcemia• Hypomagnesemia• Metastatic soft tissue calcification• Hypernatremia• Osmotic diuresis
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HypomagnesemiaHypomagnesemia
• Inhibit parathyroid hormone secretion• hypocalcaemia & hyper phosphatemia
• Supplementation if Mg <1.2 mg/dl
• Can give Oral Magnesium oxide or• Parenteral Magnesium sulphate
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Monitoring Monitoring
• Periodical assessment of vital signs
• Level of consciousness
• Hourly urine output
• Serum glucose Q1H
• Serum Potassium Q2H
• Regular assessment of anion gap
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Complications of DKA Complications of DKA
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DKA in PediatricsDKA in Pediatrics
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Criteria for diagnosisCriteria for diagnosis
• Hyperglycemia: CBG > 300mg/dl.
• Metabolic acidosis:pH < 7.25 – 7.30
HCO3- < 15 mEq/L
• Ketonemia
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Clinical featuresClinical features
• Polyuria• Polydipsia• Polyphagia• Abdominal pain• Nausea and vomiting• Rapid weight loss• Fatigue
• Confusion• Visual changes
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SignsSigns
• Dehydration• Tachycardia• Hypotension• Kussmaul respiration (rapid & deep)• Sweet, fruity odour on the breath • LOC/Coma (look for cerebral edema)
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Treatment goalsTreatment goals
• Establish good perfusion status• Reverse the acidosis• Correct electrolyte disturbances• Control hyperglycemia • Ketonemia
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TreatmentTreatment
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Correction of acidosisCorrection of acidosis
Don’t use bicarbonate as• It will increase chances of cerebral edema
by 4 times.• can lead to volume overload,
hypernatremia, paradoxical cerebral acidosis, accelerated K+ loss
Is there any role for bicarbonate in DKA?
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Indication for bicarbonateIndication for bicarbonate
• pH < 7.0• Hemodynamically unstable• Not responding to fluids• Depressed cardiac contractilty• Poor perfusion
Dose: 0.5 – 2 mEq/kg over 1-2 hrs
Stop correction once pH >7.0
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Major complication of DKAMajor complication of DKA
• Cerebral Edema: most dreaded complication• 57-87% of all pediatric DKA-
associated deaths• More in < 5yrs Rare in > 20 yrs.
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Reasons for Cerebral EdemaReasons for Cerebral Edema
• Over aggressive fluid correction• Failure of Na+ to rise with fall of glucose
during treatment• Cerebral ischemia due to severe dehydration
and hypocarbia
Onset : 6-12 hrs. after onset of therapy
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Clinical features Clinical features
• Severe headache• Seizures• Papilledema• Respiratory arrest• Altered mental status
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Hyperglycemia Hyperosmolar State (HHS)
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IntroductionIntroduction
• A metabolic emergency that occurs in diabetic patient usually Type 2 Diabetes Mellitus
• Characterised by uncontrolled hyperglycemia that induces hyperosmolar state and dehydration without significant ketoacidosis.
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Diagnostic featuresDiagnostic features
• Plasma glucose level of 600 mg/dL or greater
• Effective serum osmolality of 320 mOsm/kg or greater
• Profound dehydration (8-12 L) with elevated serum urea nitrogen (BUN)-to-creatinine ratio
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Diagnostic featuresDiagnostic features
• Small ketonuria and absent-to-low ketonemia
• Bicarbonate concentration greater than 15 mEq/L
• Some alteration in consciousness
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DKA Vs. HHSDKA Vs. HHSDKA HHS
Glucose 250-600 >600
Sodium 125-135 135-145
Potassium Normal/inc Normal
Bicarbonate <15meq/l Normal/slightly reduced
Arterial pH <7.3 >7.3
Anion gap Increased Normal/slightly increased
pCO2 20-30 Normal
Osmolality 300-320 >320
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CausesCauses
• Dehydration• Pneumonia and UTI• Counter-regulotary
hormone (e.g cortisol, cathecolamine, glucagon)
• Dialysis• TPN• Non-compliance to OHA
or insulin therapy
Drugs• Diuretics• B-blocker• Histamine(H2)
Blocker• Anti-psychotics
Clozapine, Olanzapine
• Alcohol and cocaine
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PathophysiologyPathophysiologyConcomitant illness
Circulating insulin& of counter-regulatory hormones
renal clearance and peripheral utilization of glucose
Hyperglycemia Osmotic diuresis
Loss of electrocyte and water
Dehydration
Hyperosmolarity Intracellular dehydration
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Clinical features• Occurs only in type 2 DM
• Could be initial presentation of the diabetic state
• Elderly
• Obtundation to coma
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Clinical features• Severe dehydration invariable
• May have associated lactic acidosis due to hypoxia
• Precipitating factors similar to DKA
• Mortality rate is high
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SymptomsSymptoms
Symptoms of hyperglycemia :PolydipsiaPolyuriaLethargic
Others :Weight lossLoss of consciousness
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SymptomsSymptoms
A wide variety of focal and global neurologic changes may be present :
• Drowsiness and lethargy• Delirium• Coma• Focal or generalized seizures• Visual changes or disturbances• Hemiparesis• Sensory deficits
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Physical examination Physical examination
Dehydrated : dry skin, lips, mucous membrane, loss skin turgor
Vital sign : tachycardia (early dehydration), hypotension (later), temperature
Systemic examination to ruled out the cause.
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Differential diagnosisDifferential diagnosis
• Alcoholic ketoacidosis• Delirium (altered mentation)• Dementia• Overdose• Thyrotoxicosis (tachycardia, fever,
dehydration)
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Lab studiesLab studies• Plasma glucose
Hyperglycemia: CBG : > 600 mg/dl• ABG
PH> 7.3HCO3>15 mmol/l
• Serum osmolality>320 mmol/l
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OthersOthers
• Urine-analysis• Exclude UTI• Proteinuria
• Plasma ketone• Plasma electrolyte• Renal function test( Creatinine &BUN)• CBC• Creatine kinase
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Imaging studiesImaging studies
Chest radiograph• Exclude pnuemonia• Cardiomegaly
CT scan of the head• Exclude haemorrhagic stroke, subdural
haematoma• Look for cerebral edema
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ManagementManagement
Treatment Goals:
• Correction of hypovolemia• Identify and treating underlying cause• Correcting electrolyte abnormalities• Gradual correction of hyperglycemia and
osmolarity• Frequent monitoring
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ManagementManagement
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References
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