Hydronephrosis during pregnancy: a literature survey

Area of Science:

• Obstetrics and Gynecology
• Urology
• Renal Physiology

Background:

• Physiological hydronephrosis and hydroureters occur in over 80% of pregnancies, particularly in primigravidas.
• Dilatation typically begins in the second trimester, is more pronounced on the right, and resolves postpartum.
• This condition is linked to ureteral compression against the pelvic brim by the gravid uterus.

Purpose of the Study:

• To review the literature on physiological hydronephrosis during pregnancy.
• To explore the causes and clinical significance of pregnancy-induced hydronephrosis.
• To discuss diagnostic and management strategies for this condition.

Main Methods:

• Literature review and synthesis of existing research on pregnancy-related hydronephrosis.
• Analysis of the anatomical and physiological factors contributing to ureteral compression.
• Discussion of diagnostic tools like ultrasonography and isotope renography.

Main Results:

• Hydronephrosis is likely caused by ureteral compression by the pregnant uterus against the linea terminalis.
• Hormonal changes are not considered a primary cause.
• Hydronephrosis is associated with increased risk of urinary tract infections and may be a cause of abdominal pain during pregnancy.

Conclusions:

• Positional changes can improve ureteral drainage and alleviate symptoms.
• Ultrasonography is recommended for diagnosis, with ureteral catheterization for severe cases.
• Further research may explore links between bilateral obstruction and pre-eclampsia.