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Night backache in pregnancy. Hypothetical pathophysiological mechanisms
1Department of Physical Medicine and Rehabilitation, St. Vincent's Hospital and Medical Center, New York, New York 10011.
American Journal of Physical Medicine & Rehabilitation
|October 1, 1989
Summary
Pregnancy-related night backache affects many women, with 67% reporting discomfort. This study suggests hypervolemia and inferior vena cava obstruction due to uterine growth may cause this common pregnancy symptom.
Area of Science:
- Obstetrics and Gynecology
- Physiology
- Pain Management
Background:
- Night backache is a common complaint among pregnant women.
- The second half of pregnancy presents unique physiological challenges.
Purpose of the Study:
- To investigate the prevalence of night backache in pregnant women.
- To propose a pathophysiological mechanism for pregnancy-induced night backache.
Main Methods:
- A questionnaire was administered to 100 pregnant women in their second half of pregnancy.
- Data on reported night backache and discomfort were collected.
Main Results:
- 67% of the surveyed pregnant women reported experiencing night backache or discomfort.
- The study identifies hypervolemia and inferior vena cava obstruction as potential contributors.
Conclusions:
- The proposed mechanism involves uterine pressure on the inferior vena cava, leading to venous system changes.
- Inadequate venous collateral circulation may exacerbate pressure, causing hypoxemia and nerve irritation, resulting in night backache.