Obstetrics Simplified - Diaa
Urinary Tract Infection in Pregnancy
It is the presence of 100000 organisms/ml of the same species in two
cultured fresh, mid-stream specimens of urine.
2-5% of pregnant women. If not treated 30% of them will develop symptomatic
- Symptomatic infections as cystitis and pyelonephritis.
- Intrauterine growth retardation.
- Pre-term delivery.
- Ampicillin or cephalosporin 500 mg/ 6 hours for 10 days or
- Nitrofurantoin 100 mg/6 hours.
It is inflammation of the renal pelvis and parenchyma.
30% in cases with asymptomatic bacteriuria and 1% in cases without.
Predisposing Factors during Pregnancy
- Urine stasis during pregnancy due to:
- Compression of the ureter by the gravid uterus against the pelvic
brim particularly on the right side. So infection is more common
on the right side.
- Relaxation of the ureter by progesterone effect.
- Increased urinary excretion of glucose and amino acids favours the
growth of bacteria.
- Escherichia coli (E.coli) (90%).
- Klebsiella, streptococcus, staphylococcus, proteus, pseudomonas
Started usually after 16 weeks in the form of:
- nausea and vomiting,
- urgency and frequency of micturition,
- renal pain commonly on the right side.
- Fever reaching 40oC,
- rapid pulse,
- tenderness in one or both renal angles (costovertebral angle).
- Urine analysis: pus cells, organisms and proteins. Casts and RBCs
may be present.
- N.B. Presence of organisms without pus cells suggests contamination,
while pus cells without organisms creates suspicion of tuberculosis.
- Culture and sensitivity: for urine.
- Blood picture: leucocytosis.
- Causes of acute abdomen as appendicitis, abruptio placentae and
complications of pelvic tumours.
- Causes of vomiting.
- Chronicity: with recurrent infections. In these cases, plain X-ray
and intravenous pyelography (IVP) should be done after delivery to exclude
urinary stones. Chronic pyelonephritis may result in hypertension and
renal failure later on .
- Abortion, intrauterine foetal death, IUGR or premature labour may
- Bed rest: light diet and plenty of fluids. Intravenous fluid may
be needed if there is vomiting
- Analgesics and antipyretics.
- Alkalies: as potassium citrate to inhibit the growth of E.coli.
- Antibiotics and chemotherapy: The following therapy is started until
the result of culture and sensitivity is obtained.
- Ampicillin 500 mg/ 6 hours, or
- Nitrofurantoin 100 mg/ 6hours, or
- Cephalosporins 500 mg/ 6 hours.
- Treatment is continued for 7-10 days.
Print this page
Edited by Aldo Campana,