03.05.09(b): Complications of Diabetes
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Transcript of 03.05.09(b): Complications of Diabetes
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Author(s): Arno Kumagai, M.D., 2009 License: Unless otherwise noted, this material is made available under the terms of the Creative Commons Attribution–Noncommercial–Share Alike 3.0 License: http://creativecommons.org/licenses/by-nc-sa/3.0/
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Part 2:
COMPLICATIONS
M2 - Endocrine Sequence A. Kumagai
DIABETES MELLITUS
Winter 2009
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DIABETES MELLITUS
Acute Metabolic Complications
Diabetic Ketoacidosis (DKA)
Hyperglycemic Hyperosmolar State
(HHS)
A. Kumagai
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DIABETIC KETOACIDOSIS (DKA)
Too Much Insulin
Too Little Insulin, Illness or Stress
Definition: A life-threatening state that results from a relative or absolute deficiency of insulin
Hypoglycemia DKA
A. Kumagai
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DIABETIC KETOACIDOSIS (DKA)
Definition: A life-threatening state that results from a relative or absolute deficiency of insulin. • Usually occurs in individuals with Type 1 diabetes.
• Insulin levels are very low.
INSULIN STRESS
HORMONES
Hypoglycemia Hyperglycemia & DKA
• High levels of “stress hormones”: epinephrine, norepinephrine, growth hormone and cortisol.
A. Kumagai
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DIABETIC KETOACIDOSIS (DKA)
PRECIPITATING FACTORS (VERY IMPORTANT):
INSULIN STRESS
HORMONES
Hypoglycemia Hyperglycemia & DKA
• Insufficient or no insulin.
• Physical stress: dehydration, trauma. • Surgery, infections, heart attacks, etc.
A. Kumagai
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Diabetic Ketoacidosis: Pathophysiology
PANCREAS
Liver
FAT MUSCLE
INSULIN
INSULIN
INSULIN-STIMULATED GLUCOSE TRANSPORT
HEPATIC GLUCOSE OUTPUT
INSULIN-MEDIATED INHIBITION OF
LIPOLYSIS
BLOOD GLUCOSE
80-100 mg/dL
A. Kumagai
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Diabetic Ketoacidosis: Pathophysiology
PANCREAS
Liver
FAT MUSCLE
INSULIN
INSULIN
BLOOD GLUCOSE
HEPATIC GLUCOSE OUTPUT
INSULIN-STIMULATED GLUCOSE TRANSPORT
INSULIN-MEDIATED INHIBITION OF
LIPOLYSIS
GLUCAGON
Meanwhile, in the adipocyte… A. Kumagai
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Insulin-regulated carbohydrate metabolism: adipocyte
Facilitated glucose transport!
PDH! ACC Lipogenesis!
Glycogen synthase
Lipolysis
HSL LPL!
Insulin inhibits lipolysis by stimulating lipoprotein
lipase (LPL) and inhibiting hormone-sensitive lipase
(HSL)!
GLUT4!
Insulin!(+)! (-)!
FFA Glycerol Source Undetermined
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Diabetic Ketoacidosis: Pathophysiology
PANCREAS
Liver
FAT
MUSCLE INSULIN
INSULIN
BLOOD GLUCOSE
INSULIN-MEDIATED INHIBITION OF
LIPOLYSIS
HEPATIC GLUCOSE OUTPUT
KETONES
EPINEPHRINE, NOREPINEPHRINE
EPINEPHRINE-STIMULATED
MYOLYSIS
GLUCAGON
A. Kumagai
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Diabetic Ketoacidosis: Ketoacids
O=C!CH3!
CH2COO-! O-C-H!
CH3!
CH2COO-!
O=C!CH3!
CH3!HCO3
-!
NADH !+ H+! NAD!
ACETOACETATE! !-HYDROXYBUTYRATE!
Acetone! Bicarbonate!
A. Kumagai
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Diabetic Ketoacidosis: Signs & Symptoms
HYPERGLYCEMIA
KETONES
• Polyuria and polydipsia • Severe volume depletion • Electrolyte depletion • Eventual: renal hypoperfusion,
prerenal azotemia, hypotension and shock
• Acidosis • Compensatory resp. alkalosis • Hypotension • Shock
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Diabetic Ketoacidosis: Clinical Course (Worst Case Scenario)
“Doing Well”
• Precipitating Event
• Polyuria, polydipsia, dehydration
• Anorexia, nausea, vomiting, abd. pain
• Kussmal respirations, “Juicy Fruit” Breath
• Altered consciousness
• Cardiovascular collapse
Coma & Death
Coma & Death"
A. Kumagai
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Diabetic Ketoacidosis: Effects on Mental Status
BRAIN
Factors leading to impairment of CNS function:
A. Kumagai
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Diabetic Ketoacidosis: Effects on Mental Status
BRAIN
HYPEROSMOLALITY
Factors leading to impairment of CNS function:
A. Kumagai
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Diabetic Ketoacidosis: Effects on Mental Status
BRAIN
HYPEROSMOLALITY HYPOTENSION
Factors leading to impairment of CNS function:
A. Kumagai
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Diabetic Ketoacidosis: Effects on Mental Status
HYPEROSMOLALITY HYPOTENSION
ACIDOSIS
Factors leading to impairment of CNS function:
OUCH
A. Kumagai
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Diabetic Ketoacidosis: Diagnosis
DKA
Blood Glucose
“Gap” Metabolic Acidosis
Serum Ketones
The Diagnostic Triad of DKA:
A. Kumagai
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Diabetic Ketoacidosis: Diagnosis
The “Anion Gap” represents the presence of unmeasured anions.
Na+ K+
Cl- HCO3
-
Anion Gap = Na+ - (Cl- + HCO3-)
(Normal = 12)
Organic acids, such as acetoacetate and "-hydroxybutyrate, decrease the HCO3
- (which is a biologic buffer) and aren’t measured in the gap.
Therefore, the gap increases. A. Kumagai
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Diagnosis of Diabetic Ketoacidosis
Signs and symptoms of DKA may be accompanied by those of the underlying precipitating disorder;
HOWEVER,
DKA per se DOES NOT CAUSE FEVER.
Therefore, if a fever is present, assume there is an infection until
proven otherwise!!
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Diabetic Ketoacidosis: Treatment
1. Intravenous insulin.
2. IV Fluids: Initially rapid because of severe volume depletion - loss of 7-10 L of total body water.
3. Electrolyte replacement: esp. Na, K, Mg, and PO4.
4. Carbohydrate replacement (5-10% dextrose) once serum glucose is below 250 mg/dL
5. Administration of bicarbonate for acidosis is NOT recommended.
6. Diagnose and treat PRECIPITATING EVENT!
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Treatment of Diabetic Ketoacidosis: Don’t Let an Elevated K+ Fool You!
MUSCLE
ACIDOSIS
H+
K+ K+
During acidosis, H+ shifts into cells to be buffered by intracellular buffers. K
+ shifts out of cells in exchange.
INSULIN Rx
Treatment with insulin causes K+ to shift back into cells, and serum K+
may drop like a rock during therapy.
K+
INSULIN
SERUM K+
Consequently, serum K+ is usually elevated DESPITE total body K+ depletion.
SERUM K+
Bottom Line: “As soon as you see pee, give K+!
A. Kumagai
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Treatment of Diabetic Ketoacidosis: “Mind the Gap”
O=C!
CH3!
CH2COO-!O-C-H!
CH3!
CH2COO-!
O=C!CH3!
CH3!HCO3
-!
NADH !+ H+! NAD!
ACETOACETATE! !-HYDROXYBUTYRATE!
Acetone! Bicarbonate!
Acetone is produced during the normal regeneration of bicarbonate and is detected by most serum ketone assays.
Therefore, the serum ketones normally increase during recovery from DKA.
Therefore, during management of DKA, don’t watch the ketones; MIND THE GAP!
IMPORTANT!
A. Kumagai
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Treatment of Diabetic Ketoacidosis:
NC Márcio Cabral de Moura (Flickr)
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Treatment of Diabetic Ketoacidosis
Finally,
Diagnose and treat the underlying precipitating
event!
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DIABETES MELLITUS
Acute Metabolic Complications
Diabetic Ketoacidosis (DKA)
Hyperglycemic Hyperosmolar State
(HHS)
A. Kumagai
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Hyperglycemic Hyperosmolar State
• Life-threatening metabolic disorder of extreme hyperglycemia without ketosis.
• Typically seen in elderly with type 2 diabetes, some 30% of whom are previously not diagnosed with diabetes.
• Common precipitating events: myocardial infarction, stroke, sepsis.
• Potentially deadly: mortality may exceed 40%.
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Hyperglycemic Hyperosmolar State Pathogenesis
Relative Insulin Deficiency HYPERGLYCEMIA
THE VICIOUS CYCLE OF
HHS POLYURIA
VOLUME DEPLETION
HEMO-CONCENTRATION
A. Kumagai
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Hyperglycemic Hyperosmolar State Clinical Aspects
• Hyperviscosity and increased risk of thrombosis
• Disturbed mentation and obtundation • Neurologic signs
• Focal signs, e.g., sensory or motor deficits or focal seizures
• Motor abnormalities, e.g., flacidity, depressed reflexes, tremor or fasciculations.
Ultimately, without treatment, coma and death
Increasing volume depletion and hemo-concentration may result in:
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Hyperglycemic Hyperosmolar State Treatment
• Volume correction with normal saline. • Replacement of electrolytes. • IV insulin. • Diagnosis and treatment of underlying
cause.
Similar to the treatment of DKA:
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Diabetes Mellitus
Chronic Complications
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Diabetes Mellitus: Chronic Complications
RETINA! HEART, !BRAIN & LARGE
VESSELS!
Diabetes Mellitus!
NERVES!KIDNEYS!
Microvascular Complications Macrovascular Complications
A. Kumagai
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Diabetes: Chronic Complications
Microvascular Complications
Diabetic Retinopathy
Diabetic Neuropathy Diabetic
Nephropathy
A. Kumagai
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Diabetic Retinopathy
Retinal Fundus Photographs
NORMAL RETINA
Retinal capillaries
Macula Optic nerve
Source Undetermined
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Diabetic Retinopathy
Retinal Fundus Photographs
NORMAL RETINA
Retinal capillaries Macula
Optic nerve
Disease Progression
Exudates Macular edema
NON-PROLIFERATIVE OR “BACKGROUND”
RETINOPATHY
Source Undetermined (Both Images)
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Diabetic Retinopathy
Retinal Fundus Photographs
NORMAL RETINA
Retinal capillaries Macula
Optic nerve Macular edema
Exudates
Disease Progression
New Vessel Formation
PROLIFERATIVE RETINOPATHY NON-PROLIFERATIVE OR
“BACKGROUND” RETINOPATHY
Source Undetermined (All Images)
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Diabetic Retinopathy
EM Photograph of Plastic Cast of Retinal Capillaries from Diabetic Retina
Microaneurysms
Exudates • leakage of plasma proteins into neuroretina.
Later stages of retinopathy involve death of endothelial cells and capillary “drop out,” progressive ischemia and
proliferative neovascular changes.
Source Undetermined
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Diabetic Retinopathy
Diabetic retinopathy is the leading cause of new adult
blindness in the United States.
Remember:
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Diabetic Nephropathy
Diabetic glomerulosclerosis
Diabetic glomerulosclerosis is characterized by basement membrane thickening and mesangial cell proliferation.
Diabetic nephropathy may be diagnosed in its earliest--and potentially, reversible--stages by detection of extremely small amounts of albumin in the urine, so-called “microalbuminuria.”
This is EXTREMELY
important!
Source Undetermined A. Kumagai
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Diabetic Nephropathy
Diabetic nephropathy is the leading cause of renal failure
requiring dialysis in the United States.
Remember:
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DIABETIC NEUROPATHY: Peripheral Sensory Neuropathy
Symmetrical neuropathy is the most common:
• Primarily involving the distal extremities with “stocking-glove” distribution.
• Sensory: decreased vibration, temperature, proprioception.
• Initially may present with painful paresthesias: “burning” or “pins-and-needles” sensation. Eventually leads to complete loss of sensation.
• Predisposed to skin breakdown, ulcer formation and unrecognized trauma. Diabetic Foot Ulcer
Diabetic “Charcot Feet”
Source Undetermined
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DIABETIC NEUROPATHY: Peripheral Sensory Neuropathy
Of bottlecaps and bathtubs …
oparrish (Flickr) "
A. Kumagai
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DIABETIC NEUROPATHY: Autonomic Neuropathy
• Gastroparesis • Constipation or Diarrhea
• Cardiac arrhythmias • Sudden Death
• Chronic edema • Postural
hypotension
• ERECTILE DYSFUNCTION • Urinary retention
Abnormal sweating and increased callus formation
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Diabetic Neuropathy
Diabetes is the leading cause of non-traumatic
lower extremity amputations in the United
States.
Remember:
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DIABETIC COMPLICATIONS
MACROVASCULAR COMPLICATIONS Gangrene is 14 times more common in people with diabetes
than those without.
Coronary Heart Disease: • Twice as common in people with diabetes. • Occurs at an earlier age and places women at equal risk
with men. • For MI’s: individuals with diabetes have a high initial
mortality rate and lower 5-year survival rate. • MI’s often occur WITHOUT CHEST PAIN.
Risk of death from stroke is approximately 3 times greater for people with diabetes than for those without.
This is EXTREMELY
important!
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DIABETIC COMPLICATIONS: Diabetes and Pregnancy
• Insulin Requirements increase and metabolic control often worsens during pregnancy.
• Diabetic retinopathy and possibly nephropathy may worsen.
1. Problems for the Mother:
2. Problems for the Baby: • Infant mortality is higher in babies from
diabetic mothers. • Congenital malformations are more frequent. • Respiratory distress syndrome (RDS) is more
common.
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DIABETIC COMPLICATIONS: Diabetes and Pregnancy
High blood sugars in pregnancy can lead to…
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Hyperglycemia lowers resistance to infection and interferes with wound healing.
At BGs of >250 mg/dL, WBC motility and opsinization of bacteria are significantly
impaired.
(bug) A. Kumagai"(Pacman) Albertsab@cawiki"
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DIABETIC COMPLICATIONS
• Complications from influenza are more common in individuals with diabetes.
• Infections with tuberculosis and pneumococcal pneumonia are common.
• Yeast infections are common among diabetes women.
• Wound healing is delayed in poorly controlled diabetes.
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Diabetic Complications
“Diabetes is a dreadful affliction, the melting down of flesh and limbs into urine…Life is short, unpleasant and painful...
-- Areteus of Capadocia, 2nd C. A.D.
What can we do???
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Slide 4: Arno Kumagai Slide 5: Arno Kumagai Slide 6: Arno Kumagai Slide 7: Arno Kumagai Slide 9: Arno Kumagai Slide 10: Source Undetermined Slide 11: Arno Kumagai Slide 12: Arno Kumagai Slide 15: Arno Kumagai Slide 16: Arno Kumagai Slide 17: Arno Kumagai Slide 18: Arno Kumagai Slide 19: Arno Kumagai Slide 20: Arno Kumagai Slide 23: Arno Kumagai Slide 24: Arno Kumagai Slide 25: CC: BY-NC Márcio Cabral de Moura, http://www.flickr.com/photos/mcdemoura/2209204939/, Flickr, http://creativecommons.org/licenses/
by-nc-sa/2.0/deed.en Slide 27: Arno Kumagai Slide 29: Arno Kumagai Slide 33: Arno Kumagai Slide 34: Arno Kumagai Slide 35: Source Undetermined Slide 36: Source Undetermined (Both Images) Slide 37: Source Undetermined (All Images) Slide 38: Source Undetermined Slide 40: Arno Kumagai; Source Undetermined Slide 42: Source Undetermined Slide 43: CC: BY-NC-SA oparrish, Flickr, http://creativecommons.org/licenses/by-nc-sa/2.0/deed.en; Arno Kumagai Slide 49: (Pacman) Albertsab@cawiki, Wikimedia Commons, http://commons.wikimedia.org/wiki/File:Pac_Man.svg; Arno Kumagai