MRI of caval compression during left-lateral tilt in singleton and twin pregnancies: A prospective cohort study
Authors' conclusion
IVC volume is significantly increased by 30° and 45° left-lateral tilt positions compared with supine in women with singleton and twin pregnancies.
Study context
- Population
- Women with singleton or twin pregnancies at 32 to 38 weeks' gestation, single-centre university hospital
- Participants
- 13 vs 13
- Exposure
- Left-lateral tilt at 15°, 30° and 45° vs supine; singleton vs twin pregnancies
- Singletonsn = 13
- Twinsn = 13
- Outcome
- Abdominal aortic and IVC volumes measured by MRI, supine vs left-lateral tilt at 15°, 30° and 45°
Methodological detailssingle-centre
- Single-centre
Main finding
As reported in the abstract
IVC volume increase vs supine
- Singletons 15° tilt vs Supine · ± 6.6; not increased
- mean increase 6.3 ml (95% CI −2.4 to 0.4); P = 0.174
- Twins 15° tilt vs Supine · ± 2.4; not increased
- mean increase 3.9 ml (95% CI −2.6 to 0.4); P = 0.138
- Singletons 30° tilt vs Supine · ± 5.8
- mean increase 9.7 ml (95% CI −6.1 to −2.7); P < 0.001
- Singletons 45° tilt vs Supine · ± 5.0
- mean increase 13.8 ml (95% CI −11.3 to −5.7); P < 0.001
- Twins 30° tilt vs Supine · ± 2.1
- mean increase 5.7 ml (95% CI −4.0 to −1.4); P < 0.001
- Twins 45° tilt vs Supine · ± 9.4
- mean increase 12.8 ml (95% CI −17.2 to −2.6); P = 0.003
Observational data: associations, not effects.
Original publication
MRI of caval compression during left-lateral tilt in singleton and twin pregnancies: A prospective cohort study. Eur J Anaesthesiol. Published 29 November 2023. doi:10.
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