Endocrine Flashcards
Euthyroid presents with ______FT4 and ______TSH and ______TT4
normal ; normal; low
Hypothyroid presents with _____FT4 and ______TSH and _____TT4
low; high; low
bilateral alopecia, obesity and lethargy are characteristic of what endocrine disorder?
Hypothyroid
Beagles, toy fox terrier and Giant Schnauzer are prone to what disease?
Hypothyroid
Rhodesian ridgeback, english setters and dobermans are prone to this type of hypothyroid?
primary thyroiditis
What is a screening test for hypo-T?
TT4
What is the best stand alone test to confirm hypo-T?
FT4
What is the test with the best sensitivity for diagnosing?
TT4
What is the best test for specificity?
T4/TSH
T/F Anti-thyroid Ab (ATA) interferes with assay thus increasing TT4
TRUE
T/F Anti-thyroid Ab (ATA) will interfere with FT4
FALSE
T/F Obesity, alopecia, hypotrichosis + low T4 + high TSH is a clinical diagnosis of hypo-T?
TRUE
What is the treatment of choice for hypo-T?
synthetic T4, Levothyroxine
T/F Hyper-T is common in Siamese
FALSE
T/F Hyper-T is more common in older cats
TRUE
What is the most common cause of hyper-T in cats?
functional tumor = benign/adenoma
70% are bilateral
Polyphagia, vomiting, wt loss, PU/PD, scraggly coat and pot belly are all clinical signs of what endocrine disorder?
Hyper-T
What test is a definitive diagnosis for hyper-T?
T4
A cat with normal TT4, wt loss with poor appetite, decrease activity and lethargy is presenting with what form of hyper-T?
Apathetic hyper-T
What is the DOC to treat hyper-T?
Methimazole ; BID
T/F I-131 radio-iodine is a better option for tx than methimazole
TRUE
T/F I-131 radio-iodine + methimazole offers the best prognosis
TRUE
T/F Azotemia is a positive prognosticator for the outcome (mortality) in cats treated for hyper-T
FALSE; negative prognosticator
What is the outcome of hyper-T + concurrent renal dz/
Really bad
T/F Hyper-T in dogs is rare; malignant functional tumors are the main cause
False; malignant non functional
Are most hyperadreno tumors pit or adrenal dependent?
Pituitary (85%)
What is the most important prognosticator in adrenal tumors?
metastasis
Bilateral alopecia, PU/PD, polyphagia with weight gain and lethargy are common signs of what endocrine disorder?
Hyperadreno
What will an urinalysis look like with a hyperadreno patient?
low SG, proteinuria, UTI, glucosuria
What is the most sensitive test for hyperadreno?
urinary cortisol: creatinine
T/F ACTH stimulation test is a differentiating test for hyperadreno
FALSE; is NOT a differentiating test
A diagnosis of hyperadreno can be made with this test. It is also used to monitor therapeutic response.
ACTH stimulation
What is the gold standard test for diagnosing and confirming HAC?
LDDST; look at 8 hr first if increase then HAC then look at 4 hr…if increased then PDH
T/F LDDST has a better sensitivity for cushings than ACTH stimulation test
TRUE
T/F ACTH concentration, LDDST, U/S, CT of head can be used as differentiating tests for hyper adreno
TRUE
If conducting an ACTH assay an increase in ACTH mean the tumor is located _____whereas a low ACTH means the tumor is located ______
Pituitary; adrenal
The common drug to treat hyperadreno is what?
Trilostane SID; monitor with ACTH stimulation test; want cortisol in 20-120 range
If your patient is on Trilostane but there is no improvement in clinical signs but cortisol levels are 20-120 what is your next step?
BID dosing and lower overall dose; SID just wasn’t lasting long enough
Trilostane, mitotane, ketoconazole, I-deprenul, hypophysectomy/bilateral adrenalecotomy are all option to treat what endocrine disorder?
hyerpadreno
HAC is rare in cats but what is the most common form being 85%?
PDH; trilostane not registered for cats but they respond to it
What is the most likely cause of hypoadreno?
immune mediated destruction
Other causes: mitotane/trilostane induced
What is the typical signalment of hypoadreno?
young middle aged females
T/F > 85% of destruction must be seen before clinical signs appear
TRUE
What causes the iatrogenic form of hypoadreno?
chronic use of glucs: suppressing ACTH
Deficiency of glucs and aldosterone is primary or secondary adrenal failure?
Primary
T/F Primary adrenal failure is classified as pituitary dysfunction so absent ACTH
FALSE; this is secondary
Absence of a stress leukogram is characteristic for which endocrine disorder?
Hypoadreno
Destruction of the adrenal occurs with what layer first in hypoadreno?
Zona reticularis progressing outwards to zona glomerulosa
The standard poodle, collie, portuguese water dog, nova scotia duck retriever can inherit what endocrine disorder?
Hypoadreno
There exists a chronic and addisonian crisis forms of hypoadreno…which one has wax & wane signs and is triggered by a stressful event along with episodic GI dz?
Chronic; this form is rare
Addisonian crisis is characterized by what clinical signs?
hypovolemic shock, vomiting, dehydration, bradycardia, pale MM
T/F Anemia being regenerative is characteristic of hypoadreno
False anemia with NON REGENERATIVE
Serum e-lytes consist of _____levels of Na and ______of K
low Na; high K
Na:K = sensitive but not specific
With hypoadreno GFR will be ______leading to azotemia; USG will be _______
decreased; decreased
Other e-lyte abnormalities with hypoadreno consist of ______Ca, _____ALT/ALP, ______glucose/albumin/cholesterol/pH
increase Ca and ALT/ALP
decrease glucose/albumin/cholesterol/pH
What is a main differential for hypoadreno?
Acute renal failure
T/F Na and K levels are both increase with acute renal failure and hypoadreno
TRUE
T/F Acute renal failure also lacks a stress leukogram
False; acute failure shows a stress leukogram
T/F Anemia is present with hypoadreno and is not present with acute renal failure
TRUE
When comparing acute renal failure and hypoadreno which dz cannot concentrate its urine?
Hypoadreno
Is Ca increased with acute renal failure?
NO it would be rare
T/F Microcardia and reversible megaesophagus could be seen on thoracic radiographs in a hypoadreno patient
TRUE
Would a hypoadreno patient have an increase or decrease in adrenal size on an U/S?
Decrease
What would an ECG with hypoadreno show with a K > 5.5? 6.5? 7? 8.5?
Tall T wave; prolonged QRS; P wave increased; absent P wave
Acute renal failure, GI hemorrhage, pancreatitis, pulmonary thromboemolism and DIC are complications of what endocrine disorder?
hypoadreno
What is the screening test for hypoadreno?
Resting basal cortisol
>2 = no hypoadreno
T/F All dogs with a resting basal cortisol of
FALSE
What test is used to confirm hypoadreno?
ACTH stimulation test; perform prior to starting therapy
T/F The ACTH stimulation test can distinguish primary hypoadreno from iatrogenic or from a recent steroid admin
False; it cannot distinguish between these