FirstRanker Logo

FirstRanker.com - FirstRanker's Choice is a hub of Question Papers & Study Materials for B-Tech, B.E, M-Tech, MCA, M.Sc, MBBS, BDS, MBA, B.Sc, Degree, B.Sc Nursing, B-Pharmacy, D-Pharmacy, MD, Medical, Dental, Engineering students. All services of FirstRanker.com are FREE

📱

Get the MBBS Question Bank Android App

Access previous years' papers, solved question papers, notes, and more on the go!

Install From Play Store

Download MBBS Renal Failure Lecture PPT

Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Latest Renal Failure Lecture PPT

This post was last modified on 30 November 2021


INTRODUCTION.
Kidney failure :
also known as renal failure is the partial or

--- Content provided by FirstRanker.com ---

complete impairment of kidney function.

It result in an inability to excrete metabolic

waste products and water, and it contributes to

--- Content provided by FirstRanker.com ---

disturbances of all body system.

uremic syndrome and renal failure:

are used synonymously. The term uremic syndrome

--- Content provided by FirstRanker.com ---


describes a set of manifestations that result from loss
of renal function.
ACUTE RENAL FAILURE

--- Content provided by FirstRanker.com ---

Acute kidney injury is a syndrome characterized

by-

Sudden decline in GFR(hours to day)

--- Content provided by FirstRanker.com ---


Retention of nitrogenous wastes product in

blood (Azotemia).

--- Content provided by FirstRanker.com ---

Disturbance in extracellular fluid volume

Disturbance in electrolyte and acid base

homeostasis.

--- Content provided by FirstRanker.com ---

ACUTE RENAL FAILURE

Sudden decrease in function ( hrs-days)

Often multifactorial.

--- Content provided by FirstRanker.com ---


Pre-Renal and intrinsic renal cause-70%

Oliguric, UOP-<400ml

--- Content provided by FirstRanker.com ---

Associated with high mortality and morbidity
PRESENTATION.

Often no sign or symptom

--- Content provided by FirstRanker.com ---

Oliguria

At risk group

Patient with chronic renal disease, Diabetes,

--- Content provided by FirstRanker.com ---


hypertension.

Increased creatinine and urea.
ASSESSMENT.

--- Content provided by FirstRanker.com ---


ARF vs CRF

CRF more likely if Acute illness , long duration,

--- Content provided by FirstRanker.com ---

of symptom, intra-abdominal mass, palpable
bladder.

If patient euvolaemic?

--- Content provided by FirstRanker.com ---

Renal Parenchymal disease?

Urine dipstick and microscopy

Major vessel occlusion?

--- Content provided by FirstRanker.com ---

CAUSE

Pre-renal 40-70 %

Renal 10- 50 %

--- Content provided by FirstRanker.com ---


Post- renal 10 %.
DIFFERENCE BETWEEN ACUTE AND CHRONIC RENAL
FAILURE.

--- Content provided by FirstRanker.com ---

ACUTE RENAL FAILURE

CHRONIC RENAL FAILURE

1.ONSET-OVER DAYS TO WEEKS

--- Content provided by FirstRanker.com ---


OVER WEEK TO MONTH

2.INVARIABILY REVERSIBLE

--- Content provided by FirstRanker.com ---

USUALLY IRREVERSIBLE

3.CAUSE-PRE-RENAL OR RENAL

MOSTLY RENAL

--- Content provided by FirstRanker.com ---


4.URINARY VOLUME

POLYUREA AND NOCTURIA

--- Content provided by FirstRanker.com ---

OLIGURIC AND ANURIA
5.RENAL FAILUR CAST -ABSENT

PRESENT

--- Content provided by FirstRanker.com ---

6.SPECIFIC gravity--HIGH

LOW AND FIXED.

7.DIALYSIS REQUIRED FOR SHORT

--- Content provided by FirstRanker.com ---


REPEATEDLY.

PERIOD
PRERENAL ARF.

--- Content provided by FirstRanker.com ---


Cause of pre- Renal--Due to reduced blood delivery to the

kidney.

--- Content provided by FirstRanker.com ---

Volume depletion-
hemorrhage
dehydration
GI fluid loss

--- Content provided by FirstRanker.com ---

Decrease effective circulatory blood

volume

Decrease cardiac output(CHF,MI,

--- Content provided by FirstRanker.com ---


Hypotension.)

Liver failure
Functional `

--- Content provided by FirstRanker.com ---

ACEIs, NSAID,ARBs
Correction of volume depletion can restore kidney function.
CAUSE OF POSTRENAL ARF.

Due to obstruction of urinary outflow.

--- Content provided by FirstRanker.com ---


Bladder outlet obstruction
Benign prostatic hypertrophy
Prostate cancer
Ureteral obstruction

--- Content provided by FirstRanker.com ---

Malignancy
Pelvis or Renal obstruction
Rapid resolution of Post-renal ARF without

structural damage restore kidney function.

--- Content provided by FirstRanker.com ---

INTRINSIC RENAL DISEASES

Due to damage is within the kidney( structure of the

nephron)

--- Content provided by FirstRanker.com ---


CAUSES--
Vascular damage( Renal thrombosis)
Glomerular damage( Nephrotic/Nephritic,

--- Content provided by FirstRanker.com ---

Glomerulonephritis)

Acute tubular necrosis(ATN)- Acount for 50% of

all cases of ARF.

--- Content provided by FirstRanker.com ---


Ischemia(Hypotension)
Endogenous toxin(Hb, uric acid)
Exogenous toxin(Aminoglycosides, contrast

--- Content provided by FirstRanker.com ---

induced nephropathy)

Acute interstitial nephritis
NSAID, Infection

--- Content provided by FirstRanker.com ---

Pre renal ARF can progress to intrinsic ARF if the the condition is not

corrected.


--- Content provided by FirstRanker.com ---

CLINICAL FEATURES ACUTE RENAL

FAILURE(ARF).

It depends upon the cause of ARF and

--- Content provided by FirstRanker.com ---


the stage of the disease at which the

patient presents.

--- Content provided by FirstRanker.com ---

It includes one of these 3 major pattern-
Syndrome of Acute nephritis

Syndrome accompanying tubular pathology

--- Content provided by FirstRanker.com ---

-Oliguric phase

-Diuretic phase

-Recovery phase

--- Content provided by FirstRanker.com ---


Pre- Renal syndrome
SYNDROME OF ACUTE
NEPHRITIS

--- Content provided by FirstRanker.com ---

This is associated with acute glomerulonephritis (

Inflammation of glomerulus)

Results in increase glomerular permeability and

--- Content provided by FirstRanker.com ---


decrease in glomerular filteration rate

Features?
mild proteinurea

--- Content provided by FirstRanker.com ---

Haematurea
oedema
SYNDROME ACCOMPANYING PATHOLOGY

ARF is caused by destruction of the tubule cells of the

--- Content provided by FirstRanker.com ---


nephrons?

Desease progress in three stages?

--- Content provided by FirstRanker.com ---

Oliguric phase?

Last for 7-10 days with urine output less

400ml/day.

--- Content provided by FirstRanker.com ---


Accumulation of waste product of protein metabolism

in the blood and resultant.

--- Content provided by FirstRanker.com ---

Metabolic acidosis

Azotaemia

Hyperkalaemia

--- Content provided by FirstRanker.com ---

Hyponatremia.

Hypervolaemia


--- Content provided by FirstRanker.com ---

Diuretic phase--

Healing of tubules results in improving the

urinary output

--- Content provided by FirstRanker.com ---


Effect?

Dehydration and electrolyte imbalance.

--- Content provided by FirstRanker.com ---

Recovery phase--

Full recovery of tubule cells occurs in half cases

Time period--upto one year.

--- Content provided by FirstRanker.com ---

Pre- Renal syndrome

Because of secondary disorders like ischaemia(

Decreased blood flow to tissue) and not due to

--- Content provided by FirstRanker.com ---

glomerular or tubular damage.

Cause of ischaemia--

Renal arterial obstruction

--- Content provided by FirstRanker.com ---


hypovolaemia

hypotension

--- Content provided by FirstRanker.com ---

Due to decrease renal flow, there is decrease in

GFR causing oliguria, azotemia(elevation of
BUN and creatinine) and oedema.
SIGNANDSYMPTOMSOFACUTERENALFAILURE

--- Content provided by FirstRanker.com ---


Decreased urine output--Anuria / Oliguria.

Acidic breathing.

--- Content provided by FirstRanker.com ---

Electrolyte imbalance--Hyperkalemia.

Nausea, vomiting ------Dehydration.

Hypertension

--- Content provided by FirstRanker.com ---


Hematuria

Ascitis

--- Content provided by FirstRanker.com ---

Pale skin

Poor appetite
DIAGNOSIS OF ACUTE RENAL

--- Content provided by FirstRanker.com ---

FAILURE

Routine laboratory test

(Creatinine and blood urea nitrogen)

--- Content provided by FirstRanker.com ---


Ultrasound of kidney - Ultrsonography helps to see the

presence of two kidney, for evaluating kidney size and
shape, and for detecting hydronephrosis or hydroureter,

--- Content provided by FirstRanker.com ---

renal calculi and renal vein thrombosis.

Kidney biopsy.
ACUTE RENAL FAILURE
DIAGNOSTIC.

--- Content provided by FirstRanker.com ---

Laboratory Evaluation
Blood urea and creatinine - Both are raised due to diminished renal blood flow.
URINE ROUTINE EXAMINATION
If Glomerulonephritis--
Hematurea

--- Content provided by FirstRanker.com ---

Proteinurea
RBC cast.

Serum Creatinine reliable marker of GFR

--- Content provided by FirstRanker.com ---

BUN- generally follows Serum Creatinine
BUN/ Creatinine -- helpful in classifying cause of ARF--
Ratio > 20 : 1-- suggest pre-renal cause
Ratio 10-15:1-- suggest intrinsic renal cause.
LAB. INVESTIGATION

--- Content provided by FirstRanker.com ---


Blood exam :
Anemia
Leucopenia
Thrombocytopenia

--- Content provided by FirstRanker.com ---


serum electrolytes:-
Hyponatremia
Hyperkalemia

--- Content provided by FirstRanker.com ---

Hypocalcemia

Hyperphosphatemia

Metabolic acidosis.

--- Content provided by FirstRanker.com ---


ACUTE RENAL FAILURE

DIAGNOSTIC

--- Content provided by FirstRanker.com ---

Urinolysis

Unremarkable in pre- renal and post-

renal cause.

--- Content provided by FirstRanker.com ---


Differentiates ATN vs AIN vs AGN.

Muddy brown cast in ATN

--- Content provided by FirstRanker.com ---

WBC cast in AIN .

RBC cast in AGN.

INVESTIGATION.

--- Content provided by FirstRanker.com ---


RBCs and RBC cast in Glomerular disease.

Crystals , RBC and WBC in post-renal ARF.

--- Content provided by FirstRanker.com ---

HB % -- Haemolysis, GI bleeding

/ Total Leucocyte count---Infection.

LFT: Albumin imply proteinurea--GN.

--- Content provided by FirstRanker.com ---


Elevated Blood urea, Serum creatinine ratio

indicate Pre-renal ARF.

--- Content provided by FirstRanker.com ---

HCO3: Metabolic acidosis.
OTHER BIOMARKER.

Cystatin C

--- Content provided by FirstRanker.com ---

Neutrophil gelatinase- associated lipocalin(NGAL).

Interieukin

Kidney injury molecule-1

--- Content provided by FirstRanker.com ---


N-acetyl-D-glucosaminidase.
CYSTATIN C

Superior to serum creatinine, as a surrogate

--- Content provided by FirstRanker.com ---


marker of early and subtle changes of kidney
function.

It identifies kidney injury while creatinine levels

--- Content provided by FirstRanker.com ---


remain the normal range.

Allows detection of AKI,24-48 hours earliers than

--- Content provided by FirstRanker.com ---

serum creatinine.
KIDNEY INJURY

MOLECULE-1

--- Content provided by FirstRanker.com ---

KIM-1 is a type 1 trans membrane glycoprotein.

Served as a marker of severity of AKI.

NEUTROPHIL gelatinase- associated

--- Content provided by FirstRanker.com ---


lipocalin(NGAL).

NGAL can be detected in the plasma and urine

--- Content provided by FirstRanker.com ---

within 2 hrs of cardiopulmonary bypass-
associated AKI.

Considered equivalent to troponin in acute

--- Content provided by FirstRanker.com ---

coronary syndrome.
ACUTE RENAL FAILURE
DIAGNOSTIC

TEST

--- Content provided by FirstRanker.com ---


FAVOURS PRERENAL FAVOURS ATN
DISEASE

BUN/CREATININE

--- Content provided by FirstRanker.com ---


>20:1

10-15:1

--- Content provided by FirstRanker.com ---

RATIO

Uosm

>500mosol/kg

--- Content provided by FirstRanker.com ---


<350 mosol/kg

Una

--- Content provided by FirstRanker.com ---

<20 meq/L

>40 meq/L

FEna

--- Content provided by FirstRanker.com ---


<1 percent

>2 percent

--- Content provided by FirstRanker.com ---