Pulmonary Injury as a Complication of Urinary Tract Infection in Pregnancy.

Background and objective: Pulmonary injuries resulting from urinary tract infections (UTIs) during pregnancy are rare. Prompt detection of pulmonary complications in pregnant patients with UTIs is crucial to prevent adverse outcomes in both the mother and the fetus. These complications may include respiratory issues, pulmonary edema, and exacerbation of preexisting conditions, such as asthma. We aimed to detect reported cases of pulmonary injury after UTIs among pregnancies.

Methods: We retrospectively reviewed the reported cases and articles in the PubMed database up to September 2023 on pulmonary injury after UTIs among pregnancies through a detailed search strategy. The titles and abstracts of the selected 15 articles were assessed, and ultimately, 7 articles were chosen based on adherence to our inclusion and exclusion criteria.

Results: Approximately 1-2% of women may develop acute pyelonephritis due to persistent UTIs, which has been associated with an increased risk of pulmonary edema in certain cases. UTIs can affect pulmonary health. Uremia, a consequence of UTIs, can lead to alterations in the respiratory drive, mechanics, muscle function, and gas exchange. Furthermore, urinary infection-induced inflammation activates neutrophils and promotes their recruitment to the lungs, compromising lung function and damaging the surrounding tissue.

Conclusion and global health implications: Although systematic research on this topic is limited, there may be a link between UTIs and pulmonary damage. However, it remains unclear whether pregnancy exacerbates this association. For maternal health, child health, and the whole public health, it is important to raise awareness of physicians and gynecologists, as well as the different specialties like emergency and intensive care units, with more information about pulmonary injury after UTI in pregnancy; it is important to note that UTIs may not directly cause pulmonary complications, but physiological changes associated with pregnancy can increase this risk, so more care, observation, early detection, and treatment are critical for treating these complications and achieving best outcome in pregnant women with UTIs. More research is needed in this area, as the mechanism underlying the existence of pulmonary damage post-UTI in pregnancy is unclear.