50-year-old female patient whos group B is being evaluated for kidney transplant surgery. She had ESRD secondary to analgesic nephropathy and is on hemodialysis for last 5 years. She has had multiple sensitization events in the form of 3 pregnancies and several blood transfusions. Her current calculated PRA against class I antigen is 97% and against class II antigen is 99%. She has been enrolled in the national highly sensitized recipient program.
Her husband who is blood group matched came forward as a potential kidney donor but she had positive Flow B and T Cell Cross match against him. Single antigen bead assay demonstrated that she has donor specific antibodies against class II across DQB*15 and DPB*14. This transplant did not materialize as patient declined desensitization protocol. Now her younger brother comes forward as a potential donor. He is blood group A and the flow B and T cell cross match is negative with no demonstrable donor specific antibodies against this donor.Patient wants to know more about ABO incompatible transplant.
Which of the following statements about the ABO incompatible transplant is correct?
Correct answer: Option D: C4d staining on protocol biopsies is common feature and does not necessarily mean an antibody mediated rejection process.
Explanation:
Choice A: Three-year graft survival is inferior to blood group compatible transplants is incorrect A comprehensive database analysis of 1420 ABOI living donor (LD) kidney transplants performed in 101 centers from 2005 to 2012 compared graft and patient survival to a matched cohort of ABO-compatible transplant recipients. Three-year graft and patient survival were ultimately identical. 1
Choice B: The infectious and bleeding complications post ABOI kidney transplant as same as blood matched kidney transplant is also incorrect. Using USRDS and Medicare data from 2000–2007, 119 ABOI (non-A2 donor) transplant recipients were identified. Compared with ABO-compatible recipients, the risks of infectious and hemorrhagic complications were significantly higher, with a 2.2-fold higher risk of pneumonia, a 3.5-fold higher risk of wound infections, a 56% higher risk of pyelonephritis, and a nearly 2- fold higher risk of hemorrhage 2
Choice C: All patients undergoing ABOI transplant need to undergo desensitization using IVIg, Plasma exchange, Rituximab irrespective of their donor/recipient pair Anti ABO titers for optimal outcomes is also an incorrect answer. Historically, ABOI transplantation has been successful when performed after desensitization with plasmapheresis, intravenous Ig (IVIG), rituximab, and/or splenectomy to achieve ABO IgG antibody titers 1:4. A recent publication demonstrated that these intensified treatments might not be necessary in donor/recipient pairs who have low-moderate titer ABO incompatibility 3
Choice D: C4d staining on protocol biopsies is common feature and does not necessarily mean an antibody mediated rejection process in the absence of allograft dysfunction is the correct answer C4d staining is not an uncommon feature seen in the protocol biopsies done in ABOI kidney transplant recipients. In the absence of allograft dysfunction, the C4d staining has no clinical relevance and is just a part of the graft accommodation.
Copyright © ABIM Exam World Created On: 10/30/2018 Last Modified: 10/23/2020
A 68-year-old gentleman, Caucasian descent, comes to clinic for follow up visit. He is known to have type 2 diabetes mellitus for the past 18 years. His father had diabetes from 40 years of age and developed kidney disease requiring dialysis after 15 years of diabetes. He reports no symptoms. He has been having hypertension and coronary artery disease with history of PCI 2 years ago. He has non-proliferative diabetic retinopathy. His medications are sitagliptin, gliclazide and metformin in addition to losartan and hydrochlorothiazide. He has been monitoring blood sugar at home and reports no hypoglycemia. He exercises at least at least 30 minutes per day. His vitals recording shows BP of 168/66 mm Hg. His BMI is 29.2. Systemic examination is unremarkable.
His laboratory investigation is reported as follows.
Characteristic
value
Hemoglobin
12.2 gm/L
WBC count
6.8 X 103/cubic mm
Platelet count
241 X 103/cubic mm
Segmented Neutrophils
Lymphocytes
Monocytes
Band neutrophils
Eosinophils
Basophils
60%
36%
2%
0%
Sr. Sodium
139 mEq/L
Sr. Potassium
4.9 mEq/L
Sr. Creatinine
1.2 mg/dL
Sr. Bicarbonate
22 mEq/L
Sr. Chloride
101 mEq/L
Total Bilirubin
1.0 mg /dL
AST
16 U/L
ALT
18 U/L
Sr. Albumin
4.0 g/dL
HBA1C
7.8%
Sr. Calcium
10 mg/dL
Urine dipstick
pH- 5.4
Albumin-trace
no blood
no WBCs
24-hour urinary albumin
200 milligrams/day
What is the MOST LIKELY correct statement regarding clinical diagnosis of Diabetic Kidney Disease in this patient ?
The Correct Answer is Option D: Family history of Diabetic Kidney Disease is associated with renal involvement in Diabetes.
Familial studies have demonstrated clustering of diabetic nephropathy. Patients with DM with a first-degree relative with T1/T2DM and diabetic nephropathy have more risk for developing diabetic nephropathy than those without an affected relative. This familial clustering has also been well documented in the Pima Indian population. The candidate genes identified are glucose transporter 2(GLUT2), transforming growth factor beta (TGF- ?), and endothelial nitric oxide synthase (eNOS).
Option A: Diabetic nephropathy is a clinical syndrome characterized by the following:
· Persistent albuminuria (>300 mg/d) that is confirmed on at least 2 occasions 3-6 months apart
· Progressive decline in the glomerular filtration rate (GFR)
· Elevated arterial blood pressure
Hence kidney biopsy is not a mandatory investigation to diagnose diabetic kidney disease.
Option B: If the amount of urine albumin exceeds 30 mg/d and is less than 300 mg/d it is called microalbuminuria, and if it is greater than 300 mg/d it is called macro albuminuria or overt albuminuria. Microalbuminuria is present in 5-7% of normal individuals and is associated with cardiovascular mortality and morbidity. It is marker of endothelial dysfunction in type 2 diabetes mellitus. Presence of microalbuminuria alone with diabetes cannot be clinically diagnostic of diabetic kidney disease.
Option C: Micro hematuria has been demonstrated in biopsy studies with isolated diabetic nephropathy. Red blood cell casts have also been described in patients with diabetic nephropathy. However, it is important to rule out other glomerular and extra-glomerular causes of hematuria.
Copyright © ABIM Exam World Created On: 10/31/2018
A 40 year-old pleasant African man with ESRD secondary to FSGS started automated peritoneal dialysis. His prescription includes 2.5 L and 3 exchanges over 8 hours at night with a last fill of 2 L. He has a urine output of 1000 mL/day. A typical ultrafiltration on cycler is used at 1000 mL. Average drain volume of the day dwell was 1500 mL prior to going on the cycler at night.
He came with complains of lower abdominal wall edema extending to the scrotum over the past 5 days. Without any change in the dialysis prescription, his drain volume before going on the cycler dropped to 900 mL, and the ultrafiltration volume on the cycler came down to 100 mL. He reports no pain with fill or drain.
What is the next step?
Copyright © ABIM Exam World Created On: 09/14/2017 Last Modified: 08/06/2018
Cyclosporine nephrotoxicity in a renal transplant recipient is associated with all the below renal biopsy findings EXCEPT:
(THIS PICTURE BELOW IN LOW POWER SHOWS ONE OF THE CLASSICAL FINDINGS IN CSA TOXICITY)
A 28-year-old gentleman, Caucasian descent, comes to clinic for follow up visit. He has been found to have type 1 diabetes mellitus since the age of 12 years of age. His cousin brother has the same disease. He reports no symptoms. He has been using insulin pump using insulin Aspart. He has been monitoring blood sugar using flash glucose monitor and uses carbohydrate count for boluses. He reports infrequent hypoglycemic episodes particularly 2 hours into post lunch, but, manages by himself. He exercises at least at least 60 minutes per day. His vitals recording shows BP of 118/66 mmHg. His BMI is 23.2. System examination is unremarkable.
Value
14.2 gm/L
Sr Sodium
Sr Potassium
4.4 mEq/L
Sr Creatinine
0.6 mg/dL
eGFR using CKD-EPI
136.8 ml/min/1.73m2
Sr Bicarbonate
24 mEq/L
Sr Chloride
Sr Albumin
7.9%
Sr Calcium
Albumin-nil
24-hour urinary protein
76 milligrams/day
What is the MOST LIKELY incorrect statement regarding hyperfiltration stage of Diabetic Kidney Disease in this patient?
The Correct Answer is Option D : eGFR equations like MDRD equation can be used predict hyper filtration.
Supra physiologic elevation in GFR is observed early in the natural history of type 1 and type 2 diabetes mellitus which is due to glomerular hyper filtration Pathogenesis of hyper filtration in diabetes is complex with a prominent role for hyperglycemia and distorted insulin levels especially in early diabetes and pre-diabetes. Dilatation of the afferent (pre-capillary) glomerular arteriole plays an important role in the hyper filtration response, by raising both the intra-glomerular pressure and renal blood flow.
Direct measurement of GFR is usually required to detect hyperfiltration because estimation equations, such as the Modification of Diet in Renal Disease (MDRD) usually underestimate the true GFR when it is normal or above normal.
Option A : A definite cut off of GFR is lacking. However, renal hyper filtration is typically defined as a GFR of between 120 mL/min and 150 mL/min/1.73m2, or greater than 2 standard deviations above the mean GFR in normal, healthy individuals.
Option B: Hyper filtration in diabetes precedes the onset of albuminuria and/or decline in renal function, and predisposes to progressive nephron damage by increasing glomerular hydraulic pressure
Option C : Hyper filtration per se does not seem to fully explain adverse renal outcome, as the risk for ESRD in transplant donors is very low. However, in type 1 diabetes Rapid GFR decline is associated with renal hyper filtration and impaired GFR and may predict progressive DKD prior to loss of renal function.
A 32 year-old male is brought to renal clinic with history of hematuria, oedema feet, and puffiness of face. He gives a history of fever and sore throat a week ago. He also complains of breathlessness on exertion and oliguria. Physical examination shows: Pulse 100/min, BP 150/100 mm Hg, and Temp. 37.4 C. He is pale. He has puffiness of face and oedema feet. Systemic examination-unremarkable. Laboratory examination is as follows:
Hb 10.5 g/d
Hct 34%
Platelet 250,000 mm3
WBC 8,000 mm3
Differential count P 80% L 12% E 6% M 2%
ESR 9.8 mm/h
Urinalysis:
Protein 3000 mg/24 h
Glucose None
RBC 50-60/hpf Dysmorphic
WBC occasional
Leukocyte Esterase Negative
Nitrites Negati
BUN 40 mg/dL
Creatinine 3.9 mg/dL
Sodium 140 mEq/L
Potassium 4.2 mEq/L
Bicarbonate 25.5 mEq/L
S. protein 5.5 g/dl
S. Albumin 2.5 g/dl
Calcium 9.2 mEq/L
Phosphorus 3.2 mg/dL
Glucose 100 mg/dL
Uric Acid 5.3 mg/dL
C 3 Low
C4 normal
HBsAg /HIV Neg
ANA Neg
Kidney Biopsy: Shows enlarged Glomeruli, lobular accentuation, mesangial hypercellularity, endo-capillary proliferation and double contour along the capillary wall. IF shows bright C3 in mesangium and capillary wall with absent immunoglobulin staining.
Electron Microscopy: Suggestive of dense deposits.
What is the BEST treatment option for this patient?
Copyright © ABIM Exam World Created On: 09/20/2017 Last Modified: 08/06/2018
You are the nephrologist on call. The ER calls you for an 18 year-old female who complaining of vomiting and diarrhea. Her serum sodium is 116 mEq/L and Serum potassium is 5.9 mEq/L. On physical examination the patient is drowsy, Pulse is 126/min, BP is 90/60 mm of Hg, and RR is 32/min. Her chest is clear. Her heart sounds are normal, and no murmur is visible. The patient is drowsy but arousable and there was no focal neurological deficit. Laboratory findings are as follows:
Hb 16 gm/dl
WBC 12,800/cmm
Polymorph 46%
Lymphocytes 16%
Eosinophils 4%
Monocytes 4%
Platelets 2,40,000/cmm.
CL 70 mEq/L
BUN 10 mg/dl
Creatinine 0.5 mg/dl
Na 116 mEq/L
K 5.8 mEq/L
pH 6.4
Protein trace
Glucose absent
microscopic occasional WBCs & RBCs
Urinary Na 90 mEq/L
Urinary K 20 mEq/L
ABG
PH 7.32
PCO2 36
HCO3 20 mEq/L
PaO2 92
O2 saturation 98%
S. Cortisol 6.00 mg/dl
TSH 3.5 IU/m (Normal 0-5 IU/m ).
Both plasma Renin and Aldosterone are high.
Which of the following conditions is most likely with these findings?
The ACCOMPLISH trial is the first major trial addressing the issue of combination therapy in 11,506 patients who were at high cardiovascular risk. The goal blood pressure was less than 130/80 mm Hg in the patients with diabetes or impaired renal function, and less than 140/90 mm Hg in the patients with prior cardiovascular disease.
Which of the following combinations of blood pressure medications was the best in reducing cardiovascular events and slowing the progression of nephropathy in patients with hypertension who were at high risk for such events?
Copyright © ABIM Exam World Created On: 09/20/2017 Last Modified: 01/25/2021
A 30 year-old man comes to your office for a painful rash on the neck. He has fever and malaise. He has history of HIV. He is currently taking Tenofovir, emtricitabine, and indinavir. The rash is suggestive of Herpes Zoster rash :
Physical examination does not reveal any oral cavity lesions. His current CD4 count is 250/mm3. His chemistry is normal. He is started on an intravenous medication for his rash. Two days later his chemistry is as follows:
Na 135 mEq/L
K 4.5 mEq/L
CL 100 mEq/L
HCO3 24 mEq/L
BUN 21 mg/dL
Cr 2.0 mEq/L
Glucose 95 mg/dL
Calcium 9.4 mg/dl
Urinalysis shows needle-shaped crystals in the sediment.
Which of the following is most likely the cause of his renal problem?
Copyright © ABIM Exam World Created On: 09/20/2017 Last Modified: 08/29/2018
As per the JNC VIII committee recommendation, for individuals that are part of the African American population, including those with diabetes, the initial treatment should include a thiazide type diuretic or calcium channel blocker (CCB).
Which of the following thiazide type diuretic is preferred as the initial antihypertensive therapy?
Copyright © ABIM Exam World Created On: 09/20/2017 Last Modified: 10/28/2024
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