Review of Anatomy & Physiology of Review of Anatomy & Physiology of
NephronNephron
The nephron is the anatomical and functional unit of
kidney. There are about 1 million nephron’s in each
kidney. The nephron consists of a tubule closed at one
end & other end opening into a connecting tubule. The
closed end indented to from a cup shaped glomerular
capsule (Bowman’s capsule
It is almost encloses a network of arterial
capillaries, the glomerulas continuing from
the glomerular capsule the remainder of
the nephron is about 3cm long. And it has
3 parts :
-Proximal convoluted tubule
-Loop of Henle’s
-Distal convoluted tubule
The glomerulas has 3 types of membrane :
1.The Endothelial.
2.Basement Membrane.
3.Epithelial Membrane.
These are the filtering membranes of the
glomerulas. The nerve supply of the
kidney consists of sympathetic &
parasympathetic nerves. The presence
of both autonomic nervous system
controls the renal blood flow pressure.
FILTRATION: Filtration takes place through the
membranes of the glomerulas. Water & other
large number of molecules passes through,
although some of reabsorbs later. Blood cells,
plasma proteins & other large molecules are
unable to filtrates through & remain in the
capillaries.
The volume of filtrates formed by both
kidneys is called glomerular filtration rate.
The normal GFR is 125ml/min or
180lit/day. Most of the filtrate is
reabsorbed about 1-1.5ml of fluid is
excreted per minute as urine.
DEFINATION-Acute glomerular nephritis:
It is the inflammation of the
glomeruli of both kidneys caused by
antigen-antibody reaction with respect to
streptococci, which produces damage to
the glomeruli, the filtrating bed of the
kidney characterized by decrease in the
GFR rate accumulation of organic salts,
water & other nitrogenous wastes into the
body.
CAUSES:
There is initially URTI or skin infection,
usually 1-3 weeks before the onset of
symptoms. The most frequent &
commonest causative organism is Group
A beta hemolytic streptococci.
PATHOPHYSIOLOGY:
The streptococcal infection from throat or elsewhere
from body
Attacks the immune system, the immune system
produces antibodies against streptococcal antigen.
Antigen- Antibody reaction takes place, with complex
formation.
It gets trapped in the basement membrane of
glomerulas
the complexes combines with complement.(leucosomal
enzyme)
Destruction of cell occurs.
Inflammatory changes occurs in glomerulas.
Decreased in the GFR & increased permeability of
glomerular walls.
Edema, proteinuria & microscopic Hematuria
Renal disturbances:
-Proteinuria
-Oliguria
-Hematuria
-HTN
-Decreased P
H
of urine
Diagnostic Evaluation:
-Physical Assessment:
1. Observation of the child.
2. Observation of edema over face,
periorbital area, over feet.
3. Observation for oliguria, anuria &
hematuria.
4. Observation of any visual impairment due
to retinal edema.
5. Monitor B.P for evidence of HTN.
6. Observation of any respiratory infection.
Urine Analysis:
It shows 1+ to 2+ protein. There are RBC, WBC cast which
indicates inflammation of glomeruli.
Blood Analysis:
ESR is elevated. There is normocytic anemia due to
heamodilution.
The blood levels of urea creatinine is elevated.
Serum Potassium and sodium is elevated if oliguria
contenous.
X-ray shows prominent vascular markings
due to hypervolemia.
Throat swab culture which may show
hemolytic streptococci organism.
Increased antistreptolysin titre.
Biopsy:
Kidney biopsy.
Serum complement level is decreased
Medical managementMedical management
Bed rest.
Antibiotics.
Antihypertensive.
Diet.
Restriction of fluid.
Weight monitoring.
Diuretics.
Rx of prolonged oliguria.
Chronic glomerulonephritisChronic glomerulonephritis
It is an advanced irreversible
impartment of renal function with or
without symptoms.
It may develop as a primary
Glomerular disease or may occur
secondary in SLE,drug induce
nephropathy or polyarteritis.
Etiological factorsEtiological factors
Repeated attacks of streptococci.
SLE
Drugs induced Nephropathy.
Thickening of basement membrane.
Glomerulo-sclerosis.
Polyarteritis.
PATHOPHYSIOLOGYPATHOPHYSIOLOGY
Due to etiological factors
Diffuse thickening of glomerular basement
membrane
Glomerular sclerosis takes place
Deposition of immunoglobulin,
complement & fibrin
In late stage glomeruli become sclerosis
with tubular, interstitial& vascular changes.
Clinical manifestationClinical manifestation
The condition remains a symptomatic
and may be diagnosed during
accidental urine examination.
The presenting features includes edema
severe hypertension, hematuria,
anemia, nocturia, bone pain, bone
deformity, failure to thrive.
Diagnostic evaluation Diagnostic evaluation
Urine Analysis:
It shows 1+ to 2+ protein. There are RBC, WBC cast
which indicates inflammation of glomeruli.
Blood Analysis:
ESR is elevated. There is normocytic anemia due to
heamodilution.
The blood levels of urea creatinine is elevated.
Serum Potassium and sodium is elevated if oliguria
contenous..
X-ray shows prominent vascular
markings due to hypervolemia.
Throat swab culture which may show
hemolytic streptococci organism.
Increased antistrptolysin titre.
Biopsy:
Kidney biopsy.
Serum complement level is
decreased
Management Management
No specific treatment.
Steroid & other immunosuppessrasive
drugs are helpful.
Antibiotics.
Antihypertensive.
Symptomatic & supportive treatment.
Nursing management.Nursing management.
Providing care during hospitalization.
Administration of medicines.
Maintaining proper fluid balance & assessing
edema.
NURSING DIAGNOSISNURSING DIAGNOSIS
Hematuria R/T dysfunction of glomeruli
due to infection.
Alteration in body temperature R/T
infection.
Activity intolerance R/T edema.
Fluid volume excess R/T glomerular
dysfunction.
Disturbed body image R/T physiological
changes secondary to edema.
Impaired nutritional status less than body
requirement.
Risk of impaired skin integrity R/T edema.