Steven W. Brose, D.O. Clinical Professor of Specialty Medicine, Ohio University Heritage College of Osteopathic Medicine Assistant Professor, Case
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1 Steven W. Brose, D.O. Clinical Professor of Specialty Medicine, Ohio University Heritage College of Osteopathic Medicine Assistant Professor, Case Western Reserve University SCI Physician, Louis Stokes VAMC, Cleveland
2 Disclosures No financial conflicts of interest to disclose with this work Last year s presentation (which formed the foundation for this presentation) was prepared by Dr. James K. Schmitt from Richmond, Virginia Question writer for the ABPMR SCI subspecialty board examination but have not yet participated in a question writing cycle. I am a prior oral board examiner. I am a chapter author in the next edition of Kirshblum & Lin SCI Medicine (Functional Electrical Stimulation)
3 Reference Schmitt,J, Schroeder, D Endocrine and Metabolic Consequences of Spinal Cord Injury in Lin, VW ed SPINAL CORD MEDICINE-Principles and Practice. 2010; Material is based primarily on this reference.
4 Survey of the Audience Please raise your hand if you are planning to take the SCI medicine board examination soon
5 Effects On Autonomic Nervous System Sympathetic fibers coming from T5-12 innervate the pancreas, adrenal medullar, and juxtaglomerular apparatus of the kidney so injuries above T12 can have impact on these systems Parasympathetic Nervous System : stimulates insulin secretion, while the sympathetic system inhibits it
6 Sympathetic Nervous System Sympathetic Nervous System Inhibits Insulin Secretion Loss of sympathetic system is generally short lived occurs during spinal shock usually recovers within weeks of injury So In Acute SCI, Insulin and Aldosterone Tend To Be Higher due to unopposed parasympathetic activity (?reverse autonomic dysreflexia of the autonomic system) Sympathetic chain ganglion still functions below injury
7 Indirect Endocrine Effects Renal Failure (chronic UTIs, reflux etc) can result in phosphate retention, hypocalcemia, and secondary hyperparathyroidism Stress response: after illness or injury there can be impaired growth hormone secretion, reducing intrinsic stimuli for growth and maintenance of muscle mass. Also suppresses FSH and LH, which can result in lower testosterone and estrogen levels, and effect upon pituitary gland Metabolic syndrome: Denervation leads to muscle wasting and decreased activity with increasing bodyfat buildup, insulin resistance, hyperlipidemia, HTN
8 Pituitary Function No Direct SCI Effect On Pituitary gland, because does not require an intact spinal cord injury.. but 47% of SCI Has Concomitant TBI, which can result in pituitary injury. Acute stress response causes ACTH release, stimulating cortisol production to maintain blood pressure: ADAPTIVE RESPONSE TO THE INJURY Persons with tetraplegia may have LACK of ADH surge at night time, contributing to nocturnal urine production. ADH administration at night has been used
9 Pituitary Function, Continued Acute Hypopituitarism Caused by Trauma in SCI: Manifest By Diabetes Insipidus (polyuria) and Adrenal Insufficiency; or can be due to renal tubule injury (lithium use) Diagnosis of diabetes insipidus: patient passing large amounts of dilute urine which fails to concentrate with fluid restriction. Treated by desmopressin intranasally microgram doses, or intravenously.
10 SIADH Due To Lung Tumors, Pituitary Damage, Pneumonia and Other Infections Diagnosis: Low Serum Sodium and Osmolality High Urine Sodium and Osmolality Treatments: Fluid Restriction, Demeclocycline (causes nephrogenic diabetes insipidus)
11 Thyroid Disorders Hyperthyroidism Problem: Can be difficult to diagnose in SCI: weight loss, anxiety, hyperthermia, hyperactive reflexes, tremors Hypothyroidism Also difficult to diagnose in SCI. Weight gain, hypothermia, constipation, delayed relaxation phase of deep tendon reflexes. Treatment: Levothyroxine 0.05 to 0.2 mg per day (Start LOW and Go SLOW) silent myocardial ischemia risk in tetraplegia
12 Effect of SCI On Thyroid Testing Sick euthyroid syndrome. Results in low T3 and elevation of reverse T3. Life threatening illnesses: proteins produced that displace T4 from binding site low TSH, total T4 decreased. Low T4 correlates with poor prognosis in acute illness. Study by Prakash found that in acute SCI, conversion of T4 into T3 is impaired: lowest T3 in acute tetraplegia, highest in acute paraplegia
13 Adrenal Insufficiency Most Commonly Due to Chronic Steroid Use Less Common Causes autoantibodies, or infiltrative disorders such as cancer Manifest by hypotension, hyperkalemia, hyponatremia, abdominal pain, Dx Low random cortisol, abnormal cortrosyn stim test (Normal-basal 7 ug/ml and increases to 18 or higher after 0.25 mg of Cortrosyn IV or IM Rx glucocorticoids Confounding factor: pheochromocytoma can produce hypertension, tachycardia, headache, sweating (looks like AD)
14 Autonomic Dysreflexia Vs Pheochromycytoma AD Intermittent HTN Usually Provoked by Visceral Stimulation Sweating Localized To Upper Body or Unilateral Bradycardia Vasodilation Above Level Pheo More Chronic Rarely Diffuse Absent Absent
15 Diabetes Mellitus Fasting Serum Glucose Above 126 mg/dl Or Random Glucose Above 200 mg/dl Type I Due to Pancreatic Destruction by antibodies or other causes Type II Due to Insulin Resistance and Genes Over time Type 2 leads to beta cell exhaustion and insulin is required to maintain diabetic control
16 Oral Agents Metformin mg/ day Pioglitazone mg/day Glyburide mg /day Glipizide mg/day Repaglinide 1-4 mg with every meal Acarbose mg per day Exenatide and DPP-4 Inhibitors (gliptins) Type 2 Sodium-Glucose Transport Inhibitors
17 Insulin Therapy Basal Insulin Level-Glargine or NPH Divide Body Weight in Kg By 10 to Calculate Beginning Dose Which Is Usually Given HS Preprandial Insulin-Give One Unit of Lispro per 8 grams of CH Before Meals eg 7-8 Units per 60 grams of CH.
18 Insulin Preparations Type Short Acting Lispro Aspart Regular Intermediate Acting NPH Long Acting Glargine Detemir Duration (hrs) >
19 Considerations In SCI Insulin Absorption is Higher In an Exercising Extremity: Give Injection Below Level of SCI to avoid hypoglycemia from this effect Complications of diabetes mellitus in SCI may be difficult to diagnosis: myocardial ischemia may be silent due to sensory denervation in tetraplegia; peripheral neuropathy may be silent (aside from diminishing reflexes), renal failure can be due to either diabetes or chronic pyelonephritis/refuls ACE inhibitors protect the kidneys but may cause hypotension in tetraplegia due to presence of autonomic hypotension use cautiously
20 Metabolic Syndrome Definition: collection of cardiovascular risk factors that are due to insulin resistance Common in SCI: points out importance of encouraging regular diet and exercise in SCI Diagnosis: presence of 3 out of 5 characteristics (commonly occur in SCI) Abdominal obesity Elevated triglycerides Low HDL cholesterol Elevated blood pressure (increased in paraplegia) Elevated fasting glucose
21 Lipid disorders LDL goal depends on presence of other cardiovascular risk factors Risk factors: male gender; age greater than 45; hypertension; HDL cholesterol below 35; diabetes mellitus; history of smoking; family history of coronary disease If <2 risk factors, goal LDL is under 160 If 2 or more risk factors, LDL should be under 130 If documented CAD, diabetes, renal disease: <100 Extreme cardiovascular risk such has vascular disease with diabetes, metabolic syndrome, smoking etc: <70 HDL in SCI correlates with degree of activity (Gilbert Brenes)
22 Brenes et al.
23 Calcium Homeostasis In SCI Bone Loss In Early SCI Parathyroid hormone is the primary hormone involved in calcium homeostasis. Causes osteoclasts to release calcium from bone and increases renal phosphate exretion, stimulates conversion of 25-hydroxy Vitamin D to 1,25 form in kidney which casues calcium absorbtion by renal tubules. People with SCI have decreased parathyroid hormone and 1,25 Vitamin D, increased serum phosphate and prolactin with normal calcium levels.degree of PTH suppression correlates with severity of neurologic injury
24 Baumann et al.
25 Hypercalcemia Occurs in immobilization in SCI: causes increased osteoclast and decreased osteoclast activity, particularly in young patients First line treatment is hydration with normal saline, increasing calcium excretion. Other options include intravenous pamidronate
26 Hypocalcemia Treated by intravenous calcium gluconate with D5W Important to lower serum phosphate if it is elevated before calcium is administered to avoid precipitation of calcium Glucose stimulates insulin release, lowering serum phosphate Hypoparathyroidism may result in chronic hypocalcemia treat with calcium and vitamin D
27 Gonadal Function in Men Impaired Thermoregulation and Trauma Damage Testes Causing Primary Hypogonadism FSH Elevation Indicates Impaired Seminiferous Tubule Function Opioids Cause Secondary Hypogonadism As Does Stress And Disease Semen analysis: decreased number and motility of spermatozoa and abnormal morphology
28 Kipreos Et al.
29 Androgen Replacement Replacement of Androgens In Hypogonadal Men (Eg Testosterone Enanthate 200 mg IM q 3 Weeks or Topical Preparations). Synthetic Androgens Such as Oxandralone Have Been Found to Improve Muscle Mass and Wound Healing in malnourished states, However They May Cause Liver Damage and Lower HDL Cholesterol Androgens Increase Hemoglobin Androgens Are Converted To Estrogens In Fat Which May contribute to Thrombosis Androgens May Worsen Sleep Apnea
30 Gonadal Function In Women Less Affected In Women with SCI compared to men Internal Location of Gonads Provides Protection Estrogen Replacement Prevents Osteoporosis and Raises HDL, lowers LDL However clinical studies show that estrogen increases thrombotic events, gall bladder disease and risk of endometrial cancer, therefore not recommended for prevention of coronary disease
31 Endocrine Aspects of SCI Steven W. Brose, D.O. Clinical Professor of Specialty Medicine, Ohio University Heritage College of Osteopathic Medicine Assistant Professor, Case Western Reserve University SCI Physician, Louis Stokes VAMC, Cleveland
32 Endocrine Aspects of SCI Steven W. Brose, D.O. Clinical Professor of Specialty Medicine, Ohio University Heritage College of Osteopathic Medicine Assistant Professor, Case Western Reserve University Chief, VA SCI Center, Syracuse, New York
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