1445 Simon Board Simulation in Nephrology and Hypertension

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    Nephrology Board Simulation

    James F. Simon, MDNephrology Fellowship Program Director

    Department of Nephrology and HypertensionCleveland Clinic

    Objectives

    The practice taking the Internal Medicine Board

    exam using board-related Nephrology questions

    To review key educational points in determining

    the correct responses to board-relatedNephrology questions

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    Case 1

    A 26-year old male presents with leg edema forone week

    He has been using ibuprofen 800 mg 3x/day for

    one month for a shoulder injury

    Exam is significant for a blood pressure of 130/90

    and 3+ lower extremity edema

    Urinalysis: 4+ protein, no blood

    24-hour urine protein: 10.8 grams, no hematuria

    Serum creatinine: 0.9 mg/dL (eGFR >60cc/min)

    Question 1: The most likely disordercausing this clinical picture is:

    A. Human Immunodeficiency Virus (HIV)

    nephropathy

    B. Focal segmental glomerulosclerosis

    C. Acute tubular necrosis

    D. Minimal change disease

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    Answer 1. D

    Minimal Change Disease Nephrotic syndrome without hematuria

    Preserved renal function most commonly

    15% of adults may present with ATN due to volume

    depletion

    Steroids first-line therapy

    Answer 1. D (Minimal Change Disease)

    5 ways glomerular disease can present:

    1. Asymptomatic hematuria

    2. Acute nephritis

    3. Rapidly progressive glomerulonephritis4. Chronic nephritis

    5. Nephrotic syndrome:>3gm proteinuria,

    edema, low albumin, hyperlipidemia

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    Answer 1. D (Minimal Change Disease)

    Secondary causes of minimal change

    disease

    **NSAIDs Other medications include Gold, Lithium

    Blood tumors:Hodgkins, leukemias

    Insect bites, other antigenic stimuli

    Treat underlying illness or remove offendingagents

    Answer 1. D (Minimal Change Disease)

    Treatment of Primary Minimal Change

    1. High dose steroids8-12 weeks

    2. Oral cyclophosphamide

    3. Oral cyclosporine

    Responses to Treatment

    1. Steroid responsive

    2. Steroid dependent

    3. Steroid resistant

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    Answer 1. Other Options

    A. HIV Associated Nephropathy (HIVAN)

    Nephrotic syndrome with decreased kidney

    function

    Collapsing FSGS is the classic lesion

    Echogenic kidneys on US

    HAART mainstay of therapy Predisposition to African Americans with a

    mutation in the APOL-1 genes

    Answer 1. Other Options

    B. Focal Segmental Glomerulosclerosis

    (FSGS)

    Nephrotic syndrome, bland urinary sediment,

    decreased kidney function

    Most common cause of nephrotic syndrome in

    adults, especially African Americans

    Secondary disease

    Common end-point of glomerular injury

    Hyper-filtration of remnant glomeruli

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    Answer 1. Other Options

    C. Acute Tubular Necrosis

    Acute kidney injury manifested by

    decreased kidney function

    Minimal proteinuria

    Ischemic, toxic most common causes

    Does not present with nephrotic syndrome

    Case 2

    A 19 year-old male presents with tea-colored

    urine, arthralgias, and a heart murmur

    He lives in a dorm room at college

    He had an upper respiratory infection and sore

    throat 10 days agoExam reveals

    Swollen and tender right wrist and left elbow

    Prominent cervical/submandibular nodes

    2/6 systolic ejection murmur

    2+ edema

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    Case 2 (cont.)

    Labs Urinalysis:

    SG 1.013

    No glucose

    pH 6.0

    3+ protein

    Large blood

    Microscopy: 20 RBC/HPF

    3 to 5 RBC casts

    Blood work:

    Creatinine 2.2 mg/dL

    Low C3; nml C4

    Glucose 51 mg/dL

    Elevated rheumatoid

    factor

    FeNa 3.2%

    Question 2: The most likely causefor this clinical scenario is:

    A. Membranous glomerulonephritis

    B. Wegener's granulomatosis

    C. Poststreptococcal glomerulonephritisD. Acute tubular necrosis

    E. Fanconi's syndrome

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    Answer 2: C (Post-Streptococcal

    Glomerulonephritis)5 ways glomerular disease can present:

    1. Asymptomatic hematuria

    2. Acute nephritis

    3. Rapidly progressive glomerulonephritis

    4. Chronic nephritis

    5. Nephrotic syndrome: >3gm proteinuria,

    edema, low albumin, hyperlipidemia

    Answer 2: C (Post-Streptococcal

    Glomerulonephritis)

    Nephritic syndrome

    Glomerular hematuria, tea-colored urine

    Hypertension

    Renal failure, often oliguric Proteinuria usually mild

    Mild edema

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    Answer 2: C (Post-Streptococcal

    Glomerulonephritis)

    Post-Pharyngitic Nephritis

    Acute nephritis 10-14 days after a strep infection

    Differentiation from IgA Nephropathy

    Pharyngitis or skin infections (impetigo)

    May require transient dialysis

    Self-limited course, may result in permanentkidney dysfunction

    If strep has been cleared, supportive treatment

    Culture if active infection (and treat)

    Serologies: ASO and DNAse both (or streptozyme panel)

    Low C3 level during the first week

    Elevated rheumatoid factor and circulating cryoglobulins

    Renal failure and hematuria resolve first

    Proteinuria can persist for months

    Answer 2: C (Post-Streptococcal

    Glomerulonephritis)

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    Answer 2: Other Options

    B. Wegeners Granulomatosis (GPA) Pulmonary-renal syndrome

    ANCA-associated vasculitis

    Systemic vasculitis symptoms common

    Rapidly progressive crescentic GN

    Life-threatening illness requiring prompt

    diagnosis and treatment Steroids, cyclophosphamide or rituximab,

    +/- plasmapheresis

    Answer 2: Other Options

    E. Fanconi Syndrome

    Not associated with renal dysfunction

    Proximal renal tubular acidosis (RTA)

    Hyperchloremic metabolic acidosis

    Glycosuria, phosphaturia, amino acidouria

    Mild proteinuria

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    Case 3

    A 36 year old female with recurrent kidneystones presents for further evaluation

    First kidney stone approximately 15 years ago

    Has passed approximately 50 stones since

    Strong family history of kidney stones in her

    father and brother, but no kidney failure

    Type of stone is unknown She was told to restrict her calcium intake for

    the past few years

    Question 3: Which of the following, ifdeficient in the urine, promotes calcium

    stone formation?

    A. Oxalate

    B. Citrate

    C.Sodium

    D.Proteins/amino acids

    E. Uric acid

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    Answer 3: B. Low Urinary Citrate

    Promotes Kidney Stone Formation Urinary citrate binds urinary calcium

    Non-dissociable but soluble complex

    Prevents calcium from binding to oxalate or phosphate

    Examples of diagnoses associated with low urinary

    citrate

    RTA (distal)

    Medullary sponge kidney

    Polycystic kidney disease

    Metabolic acidosis: malabsorption, ureteral diversion

    Answer 3: Other Options

    Low urine volume

    Hypercalciuria

    -Idiopathic

    -High sodium intake

    -Loop diuretics

    -Hyperparathyroidism

    -RTA

    Hypocitraturia

    -RTA

    Hyperoxaluria

    - Diet

    - Calcium restriction

    - Malabsorption

    Hyperuricosuria

    Urine pH

    - Stone dependent

    Protein loading

    Risk Factors for Calcium Nephrolithiasis:

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    Answer 3: Other Options

    Common management of all kidney stones

    to decrease recurrence:

    Increasing urine volume to over 2 L per day

    2000mg daily sodium restriction

    DO NOT restrict calcium intake

    Limit high animal fat diets

    Question 4: Renal manifestations of HIV

    infection include which of the following?

    A. Hyponatremia

    B. Tubuloreticular inclusions

    C. Focal segmental glomerular sclerosis

    D. Acute tubular necrosis

    E. All the above

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    Answer 4: E (all the above)

    A. Hyponatremia

    Seen in 60% of HIV patients during their

    disease

    Volume depletion with up-regulation of AVP

    SIADH with pulmonary and intracranial disease

    Toxoplasmosis

    Tuberculosis Pneumocystis

    Answer 4: E (all the above)

    B. Tubuloreticular Inclusions

    Associated with IFN up-regulation

    Can also be seen in lupus nephritis and after

    treatment of HCV with IFN

    Seen on biopsy

    C. Focal Segmental Glomerulosclerosis

    Previously discussed

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    Answer 4: E (all the above)

    D. Acute Tubular Necrosis

    Acute renal failure in HIV:

    ATN: medications, hypovolemia, shock

    AIN: medications, infection

    HUS/TTP

    Crystal-induced:

    acyclovir, indinavir,sulfa drugs

    Indinavir Crystals

    Case 5

    A 65 year-old male with BPH presents for follow-up 5

    days into treatment of a urinary tract infection with

    trimethoprim-sulfamethoxazole. His symptoms have

    resolved. Temperature 37.5 C; the remainder of the

    physical exam is normal. Lab work obtained shows:

    2 weeks prior Current

    BUN 12 mg/dl 12 mg/dl

    Creatinine 1.4 mg/dl 2.0 mg/dl

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    Urinalysis:

    S.G. 1.010

    Heme: neg.

    Protein: neg.

    Leukocyte esterase: negative

    No casts or cells

    Case 5 (Contd)

    Question 5: In the above patient, themost likely reason for the creatinine

    increase to 2.0 mg/dL is:

    A. Acute interstitial nephritis

    B. Acute pyelonephritis

    C. Obstructive uropathyD. Reduced creatinine excretion

    E. Acute tubular necrosis

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    Answer 5: D: Reduced Creatinine

    Excretion

    Properties of serum creatinine excretion

    Filtered by the glomerulus

    Excreted by the proximal tubule

    Slightly over-estimates true GFR

    Certain organic cations (e.g. trimethoprim,

    cimetidine) competitively inhibit creatininesecretion

    Solute Clearance

    Serum Concentration

    Endogenous

    Production

    Exogenous

    Addition

    Glomerular

    Filtration

    Tubular

    concentration

    Urinary

    excretion

    Tubular

    Reabsorption

    Tubular

    Secretion

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    Answer 5: Other Options

    A. Acute Interstitial Nephritis Associated with sulfa use

    Sterile pyuria, WBC casts on urine

    Can be associated with fever or rash

    B. Acute pyelonephritis

    Infection has cleared without clinicalpyelonephritis

    Not typically associated with AKI

    Answer 5: Other options

    C. Obstructive Uropathy

    Sulfa crystals can lead to tubular obstruction,

    hematuria, but not overt obstruction

    Early obstruction may appear like pre-renal

    azotemia, and have a low FeNa Stable BUN suggests against true AKI

    E. Acute Tubular Necrosis

    Stable BUN, no urinary evidence of ATN

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    A 54yo Caucasian male comes to see you in

    clinic

    PMH:

    Diabetes Mellitus Type 2Hb A1C 8.5

    HypertensionHome BPs 140s/90s

    HyperlipidemiaLDL 125

    Stage 4 CKDeGFR 28cc/min/1.73m2

    He takes aspirin 81mg daily with his other

    medications

    Case 6

    Case 6

    As part of your discussion of CKD and the risk of

    progressing to ESRD, you discuss the elevated

    cardiovascular risk associated with CKD

    Which of the following changes has been shownto decrease cardiovascular risk in this patient?

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    (A) Lowering the glycated hemoglobin level to lessthan 6%, compared with 77.9%

    (B) Controlling the systolic blood pressure to less

    than 120 mmHg, compared with less than 140

    mmHg

    (C) Administering aspirin 325 mg daily, compared

    with 81 mg daily(D) Administering simvastatin plus ezetimibe,

    compared with placebo

    Question 6

    First prospective trial to demonstrate CV

    risk reduction with lipid lowering agents in

    patients with CKD 4

    9270 patients, >40 years old with SCr

    >1.7mg/dL in men, >1.5mg/dL in women Mean eGFR 26.6cc/min

    Dialysis and non-dialysis dependent CKD

    Ezetimide/simvasatin vs. placebo

    Primary prevention

    SHARP Trial

    Baigent, Lancet, 377, 2011

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    Primary outcome: atherosclerotic events

    Nonfatal MI, coronary death, non-hemorrhagic stroke,

    arterial revascularization

    Median follow-up 4.9 years

    Outcomes favored treatment arm

    11.3% vs. 13.4% (RR 0.83, 95% CI 0.74-0.94)

    Subgroup analysis: (not power for subgroups) No benefit in ESRD: RR 0.9 (0.75-1.08)

    Benefit in non-dialysis CKD: RR 0.78 (0.67-0.91)

    SHARP Trial

    Baigent, Lancet, 377, 2011

    (Allpost-hoc)

    Primary Prevention:

    CARDS: atorvastatin, DM and CKD

    MEGA: pravastatin, Japanese

    JUPITER: rosuvastatin, high CRP

    AFCAPS: lovastatin

    Secondary Prevention:

    ALLIANCE: atorvastatin

    4S: simvastatin

    Trials Showing Benefit of

    Statins in CKD 3

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    AURORA: rosuvastatin

    3.8-year follow-up

    4D: atorvastatin

    4-year follow-up

    SHARP

    Despite significant LDL reduction

    Statins of No Benefit in ESRD

    Statin therapy demonstrated benefits:

    Primary prevention in CKD 3

    Secondary prevention in CKD 3

    No proven benefit (yet) in CKD 4 Combination simvastatin/ezetimide

    Primary prevention in CKD 4

    No benefits in ESRD

    Summary of Lipid Therapy in CKD

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    Other Options ACCORD Trial

    CV risk reduction in diabetes mellitus

    No benefit of intensive BP control

    SBP

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    Medications: clonidine 0.1mg bid, atenolol 50mgdaily, HCTZ 25mg daily, lisinopril 20mg daily (new 1

    year ago)

    Labs:

    Plasma renin activity 6 mg/L/hr; Aldosterone 10 ng/dL

    Na+ 136; K+ 3.3; CO2 27; BUN 45; Creatinine 1.6Urinary protein:creatinine ratio 0.6gm/gm

    Renal artery duplex: 60-99% bilateral RAS

    Case 7 (Contd)

    Question 7: If renal artery stenosis is found onangiography, which indication for angioplasty

    and stenting does this patient have?

    A. Resistant hypertension

    B. Preservation of renal function

    C. Worsening renal function on an ACE

    inhibitor

    D. Hypokalemia

    E. Congestive heart failure

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    Answer 7:

    E. Congestive Heart FailureUnderstanding the ACC/AHA guidelines for

    revascularization of renal artery stenosis

    Accelerated, resistant or malignant

    hypertension

    Progressive renal dysfunction in the setting of

    bilateral RAS or RAS to a solitary functioningkidney

    Congestive heart failure or unstable angina

    Answer 7:E. Congestive Heart Failure

    Retrospective studies consistently support the

    link between CHF and RAS

    Flash pulmonary edema or recurrent CHF

    exacerbations with RAS occur in bilateral RAS or

    RAS to solitary functioning kidney

    Intervention can improve symptoms, BP control and

    kidney function

    Prospective studies suggest improvement in

    chronic CHF with bilateral RAS

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    Often present with acute pulmonary edema and

    hypertension

    Catecholamine-driven process that cycles

    BP may spike and drop multiple times during an

    admission

    Pulmonary edema will trend with BP spikes

    Answer 7:E. Congestive Heart Failure

    Answer 7: Other Answers

    A. Resistant Hypertension

    Refractory to 3 maximally dosed anti-hypertensive

    medications, including a diuretic

    Make sure of three things:

    The drugs are maximally dosed (amlodipine 2.5mg/day) The dosing intervals are appropriate (clonidine bid or

    atenolol daily)

    The drugs are the most efficacious in their class (atenolol,

    +/- HCTZ)

    Does not meet definition of resistant HTN

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    Answer 7: Other Answers

    D. Hypokalemia

    While hypokalemia might suggest an up-regulated

    renin/angiotensin/aldosterone system, it certainly is

    not an indication alone

    Thiazide therapy can explain this

    Safian, NEJM 344(6):431, 2001

    Presentations of RAS

    HTN

    Renal Failure

    Both

    Neither

    CHF

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    Renovascular Hypertension

    Onset in women 55 years old (AS)

    Newly worsening hypertension

    Resistanthypertension

    Abdominal bruitsnon-specific in elderly

    patients

    Secondary Hypertension:

    Obstructive sleep apnea

    Hyper/Hypo-Thyroidism

    Contraceptives, Coarcation of aorta, Cushings

    Renal artery stenosis, Renal diseaseAldosteronism (primary and other)

    Pheochromocytoma

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    Case 8:

    A 55-year-old male with a history of smallcell lung cancer is admitted to the hospital

    with weakness and confusion for the past 48

    hours. He became minimally arousable this

    morning

    BP 126/70, weight 65kg

    He is arousable, not orientedOral mucosa are moist

    Lungs are clear, no edema

    Case 8, contd:

    Serum

    Sodium 118 mmol/L

    Potassium 4.0 mmol/L

    Cl 84 mmol/L

    CO2 22 mmol/LBUN 9 mg/L

    Creatinine 0.9 mg/dL

    Glucose 90 mg/dL

    Uric acid 2.5 mg/dL

    Urine

    Osmolality 450 mOsm/L

    Sodium 50 mmol/L

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    Question 8: Which of the following

    treatments will NOT lead to a rise in

    serum sodium in this patient?

    A. Effective treatment of the malignancy if

    available

    B. Free water restriction

    C. Vasopressin antagonists

    D. Isotonic saline

    E. Furosemide

    Answer 8: D. Isotonic saline

    Syndrome of Inappropriate ADH Secretion

    (SIADH)

    Known small cell lung cancer

    Hyponatremia

    High urinary sodium and osmolality Low serum uric acid level

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    Urine Parameters and

    Hyponatremia

    Intravascular

    Vol. Depletion SIADH Polydipsia

    UNa

    UOsm

    Renal Handling of Water

    Osmolality

    1200

    Osmolality

    50

    Na

    K

    2Cl

    AQ2

    H2O

    Osmolar

    load

    Water load

    Urine

    Osmolality

    AVP

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    Renal Handling of a Water Load

    Assume 600mOsmo dietary intake

    Minimal urinary osmolality of 50 mOsm/L

    Maximum urinary osmolality of 1200 mOsm/L

    What is the minimum and maximum amount of

    water you can drink in a day and still handle the

    water load solely through urination?

    0.5L12L

    Renal Handling of a Water Load

    Assume 200mOsmo dietary intake

    Minimal urinary osmolality of 100 mOsmo/L

    Maximum urinary osmolality of 800 mOsmo/L

    (elderly female tea and toaster)

    What is the minimum and maximum amount of

    water you can drink in a day and still handle the

    water load solely through urination?

    0.25L2L (8 cups of tea per day)

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    Renal Handling of a Water Load

    Any water intake beyond the maximum amount

    for a given minimum urinary osmolality must be

    retained as free water

    Leads directly to hyponatremia

    Renal Handling of a Water Load:SIADH

    Assume 600mOsmo dietary intake

    Urinary osmolality fixed at 450mOsmo/L

    What is the maximum amount of water you candrink in a day and not retain free water leading

    to hyponatremia?

    1.3L (600/450)

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    Renal Handling of a Water Load

    SIADH Assume 600mOsmo dietary intake

    Urinary osmolality fixed at 450mOsmo/L

    What is the impact of infusing 1L normal saline

    (osmolality = 308 mOsmo/L)?

    0.67L urinated at 450mOsmo/L

    0.33L retained free water

    Sodium goes down!

    Treatments for SIADH

    Osmolality

    1200

    Osmolality

    50

    Na

    K

    2Cl

    AQ2

    H2O

    Osmolar

    load

    Water load

    Urine

    Osmolality

    AVP

    Demeclocycline

    Vaptans

    (caution)

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    Case 9

    A 65yo AAM presents to your office to establish

    care. He has chronic kidney disease, diabetes

    mellitus, hypertension and hyperlipidemia.

    H/O coronary artery disease s/p stenting to LAD

    and RCA lesions 2 years ago.

    Medications

    Losartan 50mg twice daily -HCTZ 25mg once daily Amlodipine 5mg once daily -Pravachol 20mg at night

    ASA 325mg once daily -Metformin 500mg twice daily

    Glipizide 10mg daily

    Case 9

    BP 138/82, HR 87, BMI 32

    On exam:

    Lungs are clear to auscultation

    Heart is regular rhythm, S4 present, 1/6 systolic

    crescendo murmur at left upper sternal border

    No carotid bruits

    JVP 6cm

    Abd: without bruits, abnormal pulsation

    Extremities: diminished distal pulses, 2+ bilateral

    ankle edema (which he blames on amlodipine)

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    Case 9

    Labs

    Creatinine 2.0mg/dL, eGFR 41cc/min/1.73m2

    Na 138, K 5.0, Bicarb 23, glucose 156

    A1C 8.5, LDL 67, Hb 11.0

    Home blood pressure readings run 130-140/75-

    85

    Blood sugars run 150-200 when checked in themornings

    Question 9: What is the next besttherapeutic change to make?

    A. Increase metformin to 1000mg twice daily

    B. Add lisinopril 10mg once daily

    C. Increase amlodipine to 10mg once daily

    D. Add metoprolol 25mg twice daily

    E. Increase pravachol to 40mg at night

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    Answer 9:

    D: Add metoprolol 25mg bid

    Target BPs for hypertension treatment (JNC 7):

    General population:

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    Question 9: Other Answers

    A. Increase metformin to 1000mg twice daily

    Given his CKD, strong consideration should be given

    to switching to another agent rather than increasing it

    B. Add lisinopril 10mg once daily

    ON-TARGET suggested that dual ACEi and ARB

    therapy increases risk for hyperK and cardiac events

    Practice not abandoned, but should be approached with

    caution

    High-normal K would make adding ACEi hazardous

    Lancet. 2008; 372:547553

    Question 9: Other Answers

    C. Increase amlodipine to 10mg once daily

    Patient already complains of edema on 5mg dose,

    likely to be exacerbated by increase dose

    Further rise in heart rate also an unwanted

    consequence

    E. Increase pravachol to 40mg at night

    LDL goal

    For CKD without CAD:

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    Question 10

    A 36 yo female nurse presents for furtherevaluation of fatigue and muscle cramping.

    Blood pressure is normal

    Examination is unremarkable

    Plasma 24-hour Urine

    Na+ 140 mEq/L Na+ 80 mEq/d

    K+ 2.5 mEq/L K+ 170 mEq/d

    Cl- 86 mEq/L Cl- 40 mEq/dCO2 28 mEq/L Ca+2 76 mg/d

    Mag 1.5 mEq/L Mg+2 7 mg/d

    Question 10Continued

    After replenishment of her hypokalemia and

    hypomagnesemia with IV solutions, her symptoms

    resolve

    Her only medical problem is GERD for which she

    has been taking omeprazole for the past 8 months

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    Question 10: Which of the following

    would be the best next move?

    A. Start amiloride

    B. Stop the omeprazole

    C. Check a diuretic screen

    D. Discuss your concerns about surreptitious

    vomiting

    E. Start spironolactone

    Hypokalemia

    Etiology

    1. Lack of intake

    2. Cellular shifts

    3. Renal wasting

    Often associated with metabolic alkalosis

    Hypokalemia can drive and maintain an alkalosis

    24-hour urine potassium

    Renal vs. non-renal

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    Renal K wasting

    Normo-hypotensive:

    Diuretics

    Diuretic mimickers

    LoopBartters

    ThiazideGitelmans

    Hypomagnesemia

    Emesis

    Hypertensive:

    Hyperaldosterone statesprimary / secondary

    Hypomagnesemia

    Etiology

    Decreased intake/malabsorption

    Renal wasting (cause of or association with low K)

    24-hour urine magnesium vs. FeMag

    GI wasting:

    Short gut syndrome/malabsorption

    PPIs

    H+important for absorption of metals from gut

    Upregulates TRPM6/7 (magnesium channels)

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    Answer 10: Incorrect Options

    A.Amiloride for Gitelmans syndrome Low/normal BP, low urine Ca+2, high urine Cl-,

    high urine mag+2

    C. Diuretic abuse Low/normal BP, high urine Cl-, high urine mag+2

    D. Surreptitious vomiting

    Low/normal BP, low urinary Cl-

    E. Spironolactone for hyperaldostone state High BP, hypomag less not seen

    Differentiating Diuretic Abuse fromBartters/Gitelmans

    Both have:

    High urine chloride

    Upregulated renin and aldosterone

    Renal wasting of K/Mag and metabolic alkalosis

    History Recurring issueespecially if since childhood, think

    genetic

    Medical field, weight loss or other medical field

    diuretic abuse

    Diuretic screen will answer the question

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    Differentiating Bartters from

    Gitelmans Bartters:

    Mimics loop diuretics

    Acts at NKC2 triporter in thick ascending limb

    Causes increased calcium excretion in the urine

    Gitelmans:

    Mimics thiazide diuretics

    Acts at NaCl transporter in distal convoluted tubule Causes calcium reabsorption and low urine calcium

    24 hour urine calcium collection differentiates

    Hypomagnesemia-InducedRenal K+Wasting

    Magnesium increases inward movement of

    potassium movement through ROMK in the

    collecting duct

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    U

    R

    I

    N

    E

    3Na+

    2K+

    K+

    Aldo

    CORTICAL COLLECTING DUCT

    PRINCIPLE CELL

    ENaC

    BL

    O

    O

    D

    Mag+2

    U

    R

    I

    N

    E

    3Na+

    2K+

    K+

    Aldo

    CORTICAL COLLECTING DUCT

    PRINCIPLE CELL

    ENaC

    B

    L

    O

    O

    D

    Mag+2

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    Case 11

    A 28 yr-old female with 18-yr history of diabetes

    mellitus is seen at 12 weeks gestation of her first

    pregnancy

    Enalapril 5 mg/day for HTN and diabetic nephropathy

    BP 160/100. The remainder exam is normal.

    Laboratory studies reveal: Hgb A1C 10%Cr 0.8 mg/dl

    24 hr protein excretion 1.2 gm

    Question 11: Which of the followingwould you advise?

    A. Increase enalapril to 10 mg per day

    B. Replace enalapril with hydrochlorothiazide 12.5mg

    per day

    C. Continue enalapril and add alpha-methyldopa 250mg twice a day

    D. Replace enalapril with alpha-methyldopa 250 mg

    twice a day

    E. Continue enalapril and add amlodipine 5 mg per day

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    Answer 11:

    D. Replace enalapril with methyldopa Issue: Hypertension in pregnancy

    (BP>140/90) Common Internal Medicine issue

    Identify medications safe for use during pregnancy or

    when attempting to become pregnant

    Hypertension in Pregnancy

    Angiotensin converting enzyme inhibitors Cross the placenta

    Angiotensin II important in the regulation of placental

    blood flow and normal fetal growthAssociated with fetal developmental abnormalities in

    all trimesters

    CV and CNS in first trimester

    Renal, limb and others later

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    Answer 11: Hypertension in

    Pregnancy

    Methyldopa

    Labetolol

    Long acting CCBs

    nifedipine best studied

    Hydralazine Thiazides considered safe if

    already taking

    Safe Meds

    Answer 11: Hypertension in

    Pregnancy

    Classifications of Hypertension in Pregnancy

    1. Pre-existing hypertension

    Before 20 weeks gestation or lasting 12 weeks

    post-partum2. Pre-eclampsia

    HTN after 20 weeks, edema, proteinuria

    3. Gestation hypertension