Nephrology Flashcards
Important information
Major extracellular buffer in human blood is the carbon dioxide-bicarbonate buffer pair, which has a pK of 6.1
How seizures cause High Anion Gap Metabolic acidosis?
Due to increased production of lactate from muscles and decrease hepatic uptake of lactate
Name the cause of high anion gap metabolic acidosis in which is osmolal gap is increased
Ethylene glycol
Methanol
Propylene glycol
Name the acid which causes mixed anion gap metabolic acidosis viz anion gap metabolic acidosis and respiratory alkalosis
Aspirin
Lactate
Sulfuric acid
Phosphoric acid
Name the causes of Metabolic Alkalosis in which urine chloride level is low
Vomiting
NG aspiration
Prior Diuretic use
Name the causes of Metabolic Alkalosis in which urine chloride is high but patient is normotensive
Current diuretic use
Gitelman syndrome
Bartter syndrome
Name the causes of Metabolic Alkalosis in which urine chloride is high but patient is Hypertensive
Excessive mineralocorticoid activity due to;
Conn syndrome
Cushing syndrome
eCtopic ACTH production
Important information regarding Metabolic Alkalosis
If urine chloride level is <20mEq/L = Saline responsive
If urine chloride level is >20mEq/L = Saline un-responsive
Important information
In pregnancy Respiratory alkalosis occurs due to activation of respiratory center by Progesterone
Triad of Type 1 RTA
- Inability of distal cells of nephron to secrete H+
- Low body pH But high urine pH
- Low Potassium level
Why kidney stones developed in type 1 RTA?
Due to inability of distal cell of nephron to secrete H+ in lumen results alkaline urine produce which increases the formation of stones
Which type of Renal tubular acidosis occur in sickle cell trait?
Type 1 RTA
Traid of type 2 RTA
- Inability of proximal cells of nephron to absorb HCO3-
- Low pH of body as well as urine (due to distal cells )
- low potassium in body
How to d/f liddle syndrome and Conn syndrome?
In former Sr aldosterone is undetectable and in latter Sr aldosterone is detectable and very high
Liddle syndrome occurs due to mutation in collecting cells of nephron result excessive absorption of sodium ions
Name the drugs causing Hyperkalemia
A = ACEI / ARBs B = BB C = Cyclosporine D = Digoxin
N = NSAID S = Succinylcholine K = K+ sparing diuretics H = Heparin
What are the ECG findings of Hyperkalemia?
Tall T waves with PR Prolongation
QRS widening
How to stabilise cardiac membrane in hyperkalemia?
Give Calcium Chloride Or Calicum gluconate
Important information
Pts with chronic hyperkalemia may be asymptomatic until K+ gradually rises >/=7.0 mEq/L.
INDICATIONS FOR EMERGENT TREATMENT OF HYPERKALEMIA
- Marked elevation (>6.5 mEq/L) without characteristic ECG changes OR
• Presence of hyperkalemia-related ECG changes
• Rapid rise in serum potassium level due to tissue breakdown
How low level of Magnesium decreases potassium level?
Mg is imp.cofactor for K+ uptake and maintenance of intracellular K+ check and correct Mg in chronic alcoholics to correct hypokalemia.
Another cause of hypomagnesemia is diuretics
How to t/m severe Hypercalcemic>14mg/DL Or Symptomatic?
- long term give Bisphosphonate
* Short term Hydrate PT & give calcitonin and Avoid to give diuretic unless volume overload
How to t/m moderate Hypercalcemia that is 12-14mg/DL?
- No t/m unless Symptomatic
* And if symptomatic then t/m A/c to severe Hypercalcemia
When to use hemodialysis as a t/m for Hypercalcemia
Hemodialysis is an effective treatment for hypercalcemia, but is typically reserved for patients with renal insufficiency or heart failure in whom aggressive hydration cannot be administered safely
How to t/m Euvolemic Or Hypervolemic hypernatremia?
Free water supplementation Or 5% D/W in water
How to t/m Asymptomatic Hypovolemic hypernatremia?
5% D/W in 0.45% N/S
How to t/m Symptomatic Hypovolemic hypernatremia?
0.9% N/S until euvolemic then used 5% D/W
What are the causes of HyperVolemic Hypo osmolarity Hyponatremia ?
Hint = Body is edemic
- CHF
- Hepatic failure.
- Nephrotic syndrome
What are the causes of EuoVolemic Hypo osmolarity Hyponatremia ?
• If urine Sodium more than 20 and Urine Osm more than normal = SIADH
If urine Sodium more than 20 but Urine Osm is normal( due to intact ADH system )= Psychogenic polydipsia Or Beer Potomania
What are the causes of Hypovolemic Hypo osmolarity Hyponatremia?
- If urine Sodium less than 10 = Dehydration/Vomiting/Diarrhea
- If urine Sodium more than 10 = Diuretics/ACEI/Mineralocorticoid deficiency
What will be the t/m of moderate SIADH viz confusion and lethargy?
- Give hypertonic saline 3% in first 3-4 hrs to increased Sr.Na more than 120meq/l
- later on fluid restriction/ possible oral salt tablets/ loop diuretics if urine osmolality 2times greater than Sr osmolality
What will be the t/m of Severe SIADH viz fits/ not able to communicate and coma?
- Bolus of hypertonic saline until Sx resolute
* Vasopressin Receptor Antagonist?
Name the enzyme deficient in syndrome of “Apparent” mineralocorticoid excess
11 beta hydroxysteriod dehydrogenase responsible to convert cortisol into cortisone
What happens in syndrome of apparent mineralocorticoid excess?
Due to deficiency of 11beta hydroxy dehydrogenase, cortisol will activate aldosterone receptors result:
HTN,
High Sr.Na,
low Sr.K and “low Sr Aldosterone”
How to t/m SAME?
Give potassium sparing diuretics
And Exogenous steroid which will inhibit endogenous production of steroid
Name the acid which can cause SAME?
Glycyrrhetinic acid present in Licorice
Name the bacteria which have positive Urease Test
Proteus
Klebsiella
Saprophyticus
Important information of UTI due to “Serratia marcescens”
Some strains produce a “red pigment;
often nosocomial and drug resistant
Important information of UTI due to “Pseudomonas aeruginosa”
Blue-green pigment and fruity odor;
usually nosocomial and drug resistant.
Important information of UTI due to “Proteus mirabilis”
Motility causes “swarming” on agar;
associated with struvite stones.
What is the t/m of Pyelonephritis esp in non pregnant females?
Gives Quinolones as “Outpatient t/m”
Give IV Quinolones Or Aminoglycosides with or W/O ampicillin
What is the t/m of Complicated Cystitis esp in non pregnant females?
Quinolones for 5-14 days
For severe cases Give extended Spectrum Abx( Ampicillin/Gentamicin)
What is the t/m of Un-Complicated Cystitis esp in non pregnant females?
Nitrofurantoin for 5 days
Tmx-Sx for 3days
Fosfomycin single dose
Quinolones If above options cannot be used
Name the Abx for UTI given in pregnancy instead of Quinolones
Augmentin
Fosfomycin
Cephalexin
Cefpodoxime
D/f b/w Glomerular* Vs Non Glomerular Hematuria**
Microscopic hematuria/RBC cast & dysmorphic RBC and protein in urinalysis*
Gross hematuria/No cast, normal shape RBC, blood present but not protein in urinalysis**
If “Spike and Dome” appearance seen on Electron microscope then what is the cause of nephrotic syndrome?
Membranous nephropathy
What will be seen on Light microscopy in membranous nephropathy?
Diffuse capillary and GBM thickening
Patient with HBV has strong potential to develop which kinda of nephrotic syndrome?
Membranous nephropathy
What will be seen on LM in focal segmental Glomerulosclerosis?
Segmental sclerosis and hyalinosis
immunofluorescence report of Post infectious glomerulonephritis will show what?
Stary sky granular appearance (Lumpy bumpy) due to IgG, IgM and C3 deposition along with GBM and Mesangium.
Granular immunofluorescence will seen in which conditions of nephrotic and nephritic?
Membranous nephropathy
PSGN & DPGN
Pattern of immune complex deposition in GoodPasture syndrome would be?
Linear immunofluorescence due to antibodies to alveolar basement and GBM
Name the cause of nephritic syndrome which shows “wire looping of capillaries” on LM?
DPGN
Name the cause of nephritic syndrome which shows “Basket weave” on electron microscope?
Alport syndrome
Triad of Mixed Essential CRYOGLOBULINEMIA
palpable purpura,
hematuria,
proteinuria
MC coagulopathy occur due to nephrotic syndrome
Renal vein thrombosis esp in membranous nephropathy
Important information for minimal change diseases
Renal biopsy is indicated in children age>10yrs with nephrotic syndrome, or
in any child with nephritic syndrome or minimal change disease that is unresponsive to steroids
Conditions associated with “AL amylodosis
Multiple myeloma
And Waldenstrom macro globulinemia
Composition of amyloid in “AL amyloidosis”
Light chains usually lambda
Conditions associated with “AA amyloidosis”
Chronic inflammatory conditions viz. RA and IBD
Chronic infections viz Tb and osteomyelitis
Composition of Amyloid in “AA amyloidosis”
Abnormally folded protein: beta 2 micro globulin
App lipoprotein Or Transthyretin
What is the earliest renal abnormality in diabetic nephropathy?
Glomerular hyperfiltration
What is the first changed in diabetic nephropathy that can be quantified?
Thickening Of GBM
Histological finding of diabetic nephropathy
Diffuse glomerulosclerosis but
Pathognomonic finding: nodular glomerulosclerosis (with Kimmelstiel Wilson nodules)
Why dipstick test not recommended in diabetic nephropathy?
B/c it only detects macro albuminuria which is not seen in early in Diabetic nephropathy
What are the clues that suggest albuminuria due to non diabetic nephropathy?
onset of proteinuria <5 years after disease onset,
active urine sediment (eg, red cells, cellular casts),
and >30% reduction of GFR within 2-3 months of starting ACEi or ARB