UPTODATE MANAGEMENT OF DKA IN CHILDREN
Transcript of UPTODATE MANAGEMENT OF DKA IN CHILDREN
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UPTODATE
MANAGEMENT OF
DKA IN CHILDREN
عبدالقادرد أحمد
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1
2
3
Background of DKA
Electrolytes
Fluids and insulin
Programme
Monitoring4
Cerebral edema5
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General rules
DKA is the commonest serious complication
of diabetes
It is fatal if not treated
With proper management it is completely
treatable condition
Consider senior consultation as early as
appropriate
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The incidence of mortality in DKA in U.S.A is 0.5 %
due to :
Dehydration, shock, acidosis.
Hypoglycemia.
Electrolytes disturbance (Hypokalemia).
Aspiration Pneumonia
Cerebral oedema.
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Mortality is
Unacceptable if it isdue to
Dehydration, acidosis, electrolytes disturbance & hypoglycemia
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Cerebral oedema
is unpredictable
occurs more frequently in
younger children and newly
diagnosed diabetes
has a mortality of around 25%
causes are not known
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Hypokalaemia
This is preventable with
careful monitoring and
management
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Blood sugar is the 5th vital sign in sick infants and children
Respiratory rate
Pulse
Temperature
Blood pressure
Blood sugar
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The diagnostic criteria of DKA
Hyperglycemia
BG > 200mg/dl
Acidosis
Venous pH <7.3 and/or bicarbonate <15 mmol/L
Ketosis
Presence of ketones in the blood, urine, or both (BOHB>3.0 mmol/l )
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SeverModerateMildParameters
7-10
(8%)
5-7%3%Dehydration
Semi-comaAlert ∕ drowsyAlertConsciousness
>600400 - 600300 – 400Glucose mg/dl
HighNormal or NormalBUN
<7.17.1-7.27.2-7.3PH
LowNormal or
slightly low
NormalPco2
Grading of DKA
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Mild DKA
Children who are alert
not clinically dehydrated
not nauseated or vomiting
do not always require IV fluids,
even if their ketone levels are high
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Mild DKA
They usually tolerate oral
rehydration and subcutaneous
insulin
but do require monitoring
regularly to ensure that they are
improving
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Moderate and Sever DKA
Drowsy to semiconscious
to comatose
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Conscious Level
Institute hourly neurological observations
including Glasgow Coma Score
conscious level is directly related to degree of
acidosis, but signs of raised intracranial
pressure suggest cerebral oedema
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In the absence of insulin and increase in CRH
FFA keton bodies
B-oxidation
Palmatyl Co-A transferase
Acetone
Acetoacetate
B-hydroxybutaric acid(BHOB)
Very
acidic
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The main ketone in DKA is
B-hydroxybutaric acid(BHOB) (the ratio 10/1)
Acetoacetate
Acetone
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Use a near-patient testing method
beta-hydroxybutyrate level for the diagnosis and monitoring of the treatment of DKA
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If a near-patient testing method is not available
use urinary ketone levels to make the diagnosis, but they are notuseful for monitoring
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Testing Ketones
Urine Capillary blood
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urine dipstick
for diagnosis and assessment of severity
Not for follow up after starting DKA Rx
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If a child is
hyperosmolar
very high BG level >30 mmol/l
( 540 mg )
with little or no acidosis or
ketones
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HHS
this is a HyperosmolarHyperglycaemic State
and requires DIFFERENT treatment
Discuss this with the senior doctor–these children can be very
difficult to manage
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Metabolic acidosis in DKA
Usually corrected spontaneously by fluid and
insulin
Bicarbonate : generally is not recommended
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Suspect sepsis(in DKA) if there is
Fever
Hypothermia
Hypotension
Refractory acidosis
Lactic acidosis
Insulin resistance
Blood culture
Urine R/E & culture
CXR-cough or chest findings
LP if there is meningealsigns
3rd generation cephalosporinsor Ampi-genta
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Causes/Precipitating Factors of DKA
Missed insulin injections
Intercurrent illness/infection
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Full Examination - looking particularly for
cerebral oedema
infection
ileus
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cerebral oedema
Headache
Irritability
slowing pulse
rising blood pressure
reducing conscious level
N.B. papilloedema is a late sign
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Calculations in DKA
Serum Osmolality:
2[Na]+ (glucose/18)
Corrected Na =
Measured Na + (1.6)(glucose - 100)/100
Anion Gap:Na– (Cl+HCO3) Normally <12
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Corrected Na =
Measured Na + [(serum glucose as mg/dl−100)/100] ×1.6
Example BG=600 measured Na = 130
130 + [600−100)/100] × 1.6
130+{500/100 }× 1.6
130+ 5 × 1.6 130+8=138
Corrected Na=138
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Risk factors of developing CE
Younger children
New onset T1DM presenting with DKA
Low Pco2
Increased BUN
Sever dehydration and acidosis
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Treatment related risk factors of CE
Early use & bolus insulin
Use of bicarbonate
Rapid hydration
Use of diluted fluid
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In the emergency room and after
Document the initial GCS score for use as a baseline
Obtain an accurate weight
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Fluid requirement in DKA
Deficit(plus-minus bolus)
Maintenance
Ongoing lossesx
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Bolus only if shocked
poor peripheral pulses
poor capillary filling with
tachycardia
and/or hypotension
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Bolus only if shocked
give 10 ml/kg 0.9% sodium chloride as
a bolus
(There is no evidence to support the use of
colloids or other volume expanders in
preference to crystalloids)
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Type of fluid is normal saline
No place for 20cc/kg in DKA
If in shock(BP is low) 10/kg as fast as possible. repeat till BP normalize-max-three
If in BP is N+ poor perfusion
5-10cc over 1hr
sever DKA with N-BP & normal perfusion no bolus
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If DKA patient in shock and not responding to two boluses
What are the possible causes?
Sever acidosis
Sepsis
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Be careful with fluid bolus
Bolus only if in shock
DKA patient rarely shocked
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Sever DKA (High risk for CE)
Correct hyperosmolarity slowly over 48hrs
By reducing glucose slowly(50-80mg/dl/hr)
By rehydration slowly(48hrs) by hypertonic
fluids(N/S)
Monitor carefully for complication of Rx(CE)
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Management Goals
Fluid resuscitation & slow correction of
dehydration(48hrs)
Reversal of the acidosis and ketosis
(by insulin & IVF )
Reduction in the plasma glucose concentration to
normal
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Management Goals
Replenishment of electrolyte (sodium &
potassium)
Identification the underlying cause (infection)
Monitor for complications of DKA and its
treatment
( Hypokalemia, hypoglycemia and CE)
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DKA treatment
ABC
Monitoring
Specific treatment
Fluids
Potassium
Insulin
Management of complications
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EMERGENCY MANAGEMENT
1. General Resuscitation: A, B, C. Airway Ensure
that the airway is patent and if the child is
comatose, insert an airway. +(urinary
catheter)
If consciousness reduced or child has recurrent
vomiting, insert N/G tube, aspirate and leave
on open drainage.
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Initial Investigations
blood glucose
urea and electrolytes (electrolytes
on blood gas machine give a guide
until accurate results available)
blood gases (venous or capillary)
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Initial Investigations
near patient blood ketones (beta-
hydroxybutyrate) if available (superior to urine
ketones)
other investigations only if indicated e.g full
blood count (leucocytosis is common in DKA and
does not necessarily indicate sepsis), CXR, CSF,
throat swab, blood culture, urinalysis, culture and
sensitivity etc
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Fluid requirement
5% for mild to moderate DKA
and 10% for severe DKA, based
on pH
x
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BSPED Guidelines August 2015
Mild 3% Only just clinically
detectable
Moderate 5% Dry MM, reduced skin
turgor
Severe 8% Above with sunken eyes,
drousy
+shock Severely ill, poor
perfusion, thready pulse
Over estimation of dehydration is Dangerous: DO NOT USE MORE THAN 8%
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Fluid requirement
Deficit + maintenance - bolus
Ongoing losses generally are not calculatedx
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Fluid requirement
Deficit + maintenance - bolusx
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Fluid Calculation in sever DKA
Deficit 8%
Add two maintenance
Divide over 48 hrs
Giving the total volume evenly over the next 48
hrs. As hourly rate
hrly rate = (deficit) + 2*maintenance / 48hr
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Deficit=% dehydration * 10 * wt
Use 3-5% for moderate DKA
7-9% for sever DKA average 8%
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What is the duration of rehydration for sever DKA?
12 hours
24 hours
36 hours
48 hours
72 hours
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The conventional maintenance therapy calculation
APLS maintenance fluid
100ml/kg /day…………………for the 1st 10 kg body weight.
50 ml/kg/day …………………added for 2nd 10 kg body weight.
20ml /kg /day………………....added for each kg above 20kg.
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Infusion pump is the best for IVF and insulin infusion in treatment of DKA
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IVF regulators
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When to shift from N/S to ½ NS?
For all sever DKA patient continue
normal saline for the
12hrs
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Sodium rising
Sodium is not rising or decreasing
After12hrs look at measured sodium
Shift to 1/2N/S
Continue 0.9N/S
With or without dextrose depending on BG
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Oral Fluids
Do not give oral fluids to a child or young person who is receiving intravenous fluids for DKA until ketosis is resolving and there is no nausea of vomiting.
NGT may be necessary in the case of gastric paresis.
If oral fluids are given before the 48hr rehydration period is completed, the IV infusion needs to be reduced
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Fluid Losses
If a massive diuresis continues for
several hours fluid input may need to
be increased
If large volumes of gastric aspirate
continue, these will need to be
replaced with 0.45% saline with KCl
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POTASSIUM
Ensure that all fluids (except any
initial bolus) contain 40 mmol/l
potassium chloride, unless there is
evidence of renal failure
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POTASSIUM
Potassium is mainly an intracellular ion, and there is always massive depletion of total body potassium although initial plasma levels may be low, normal or even high
Levels in the blood will fall once insulin is commenced
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General rules during Rx of DKA
Reduce glucose slowly
(50-80mg/dl/hr)
Keep BG between 150-250 mg/dl
(200-300mg/dl accepted)
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Two important rules in DKA Rx
Start insulin after 1hr with potassium
Fluid replacement should begin before starting insulin
therapy
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Insulin in DKA
Start at least one hour after starting IVF
No initial bolus
Regular or rapid acting insulin
0.1 unit/kg/hr infusion enough for all patient
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(0.05U/kg/hr is recommended for)
Younger age(<5yrs) & newly diagnosed
Hypokalemia at presentation
Euglycemic DKA & HHS
Pts with high risk factors for CE??
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Once BG <300mg/dl
change from N/S to N/S with D5
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Once BG <300mg/dl
Don't reduce insulin insulin needed to
switch off ketogenesis
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If the BG falls below 150mg/dl
increase the glucose concentration
of IVF infusion
if there is persisting ketosis,
continue to give insulin at a dosage
of least 0.05 units/kg/hour
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If the BG falls below 80mg/dl
give a bolus of 1-2 ml/kg of 10%
glucose and increase the glucose
concentration of the infusion
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Hypoglycemia during DKA management
Allowing BG to drop to hypoglycemic levels is a
common mistake that usually results in a rebound
ketosis derived by counter-regulatory hormones
Rebound ketosis necessitates a longer duration
of treatment
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Lantus during DKA treatment
For children who are already on long-acting
insulin (especially insulin glargine (Lantus)), you
may wish to continue this at the usual dose and
time throughout the DKA treatment, in addition to
the IV insulin infusion, in order to shorten length
of stay after recovery from DKA.
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Continuing acidosis is usually caused by
Insufficient fluids
Insufficient insulin
Sepsis
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If after 4-6 hours
the blood glucose rises out of control, or
the pH level is not improving consult
senior medical staff and re-evaluate
possible sepsis, insulin errors or other
condition
consider starting the whole protocol
again
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If within 6–8 hours
the blood ketone level is not falling
think about increasing the insulin
dosage to 0.1 units/kg/hour or
greater
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Once the BG has fallen to 250 mg/dl
add glucose to the fluid and think
about the insulin infusion rate, as
follows
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If ketone levels are less than 3 mmol/l
change the fluid to contain 5% glucose; use 500 ml bags of 0.9% sodium chloride with 5% glucose and 20 mmol potassium chloride in 500ml which are available from Pharmacy.
reduce to or maintain at an insulin infusion rate of 0.05 units/kg/hr
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If ketone levels are above than 3 mmol/l
maintain the insulin infusion rate at 0.05 to 0.1
units/kg/hour to switch off ketogenesis
change the fluid to contain 10% glucose
rather than 5% glucose, in order to prevent
hypoglycaemia when the higher dose of insulin
is continued
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Bicarbonate use in DKA
Rarely needed if ever
Hyperkaelemia at presentation
The only important role of bicarbonate is to
improve cardiac contractility caused by sever
acidosis usually <6.9 resulting in shock that is not
responding to IV N/S bolus
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Bicarbonate in DKA
multiple studies suggest that bicarbonate
therapy may cause paradoxical
intracellular acidosis, worsening tissue
perfusion and increase the risk
of hypokalemia, and cerebral edema
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MONITORING
Ensure full instructions
are given to the senior
nursing staff
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MONITORING
hourly capillary blood glucose
Do not rely on any sudden changes but
check with a venous laboratory glucose
measurement
capillary blood ketone levels every 1-2
hours (if available)
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MONITORING
urine testing for ketones used only at
beginning for diagnosis (only needed if
blood ketone testing not available)
hourly BP and basic observations
hourly level of consciousness initially,
using the modified Glasgow coma score
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MONITORING
half-hourly neurological observations,
and heart rate, in children under the age
of 2, or in children and young people with
a pH less than 7.1, because they are at
increased risk of cerebral oedema
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MONITORING
headache
slowing of pulse rate
any change in conscious level
or behaviour
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If cerebral oedema is suspected, treat immediately
mannitol (20% 0.5-1 g/kg over
10-15 minutes) or
hypertonic saline (2.7% or 3%
2.5-5 ml/kg over 10-15 minutes).
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If cerebral oedema is suspected, treat immediately
deterioration in level of consciousness
abnormalities of breathing pattern, for example respiratory pauses
oculomotor palsies
abnormal posturing
pupillary inequality or dilatation.
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If cerebral oedema is suspected, treat immediately
fluids should be restricted to ½ maintenance rates
inform senior staff immediately.
After starting treatment for cerebral oedema with mannitol or hypertonic saline immediately seek specialist advice on further management
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If cerebral oedema is suspected, treat immediately
do not intubate and ventilate until an experienced doctor is available
once the child is stable, exclude other diagnoses by CT scan - other intracerebral events may occur (thrombosis, haemorrhage or infarction) and present similarly
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If cerebral oedema is suspected, treat immediately
a repeated dose of Mannitol may be
required after 2 hours if no response
document all events (with dates and
times) very carefully in medical
records
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MONITORING
reporting any changes in the ECG trace,
especially signs of hypokalaemia, including ST-segment depression and prominent U-waves
twice daily weight; can be helpful in
assessing fluid balance
Start recording all results and clinical signs on
a flow chart.
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Medical reviews
At 2 hours after starting treatment, and then at
least every 4 hours, carry out and record the
results of the following blood tests -
glucose (laboratory measurement)
blood pH and pCO2
plasma sodium, potassium and urea
blood ketones (beta-hydroxybutyrate).
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The golden role duringmanagement of DKA
In any neurological manifestation
hypoglycaemia should be excluded
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Change to SC INSULIN
1. Fully conscious2. Well hydrated3. No acidosis4. PH more than 7.35. No GIT. Symptom6. S.k+ and s. Na+ (normal)
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Thank
you