Observational studyCanadian journal of anaesthesia = Journal canadien d'anesthesie2021
Ultrasound evaluation of inferior vena cava compression in tilted and supine term parturients.
Observational study in Canadian journal of anaesthesia = Journal canadien d'anesthesie, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to 3 registered trials, which are not on this map. Cited by 8 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Ultrasound Evaluation of Inferior Vena Cava Compression During Elective Cesarean Delivery. Comparison of Tilt Versus No Tilt Positioning.
Investigation of Acute Effect of Pelvic Floor Muscle Exercises on Inferior Vena Cava
Ultrasound Assessment of Inferior Vena Cava Collapsibility Index (IVCCI) to Guide Pre-operative Fluid Management in Critically Ill Pre-eclamptic Patients in Comparison with the Standard Fluid Management
Who cites it
8 citing papers in PubMed, 15 citations in OpenAlex.
- Correlation between corrected carotid flow time and ultrasonic inferior vena cava-collapsibility index in parturients with twin pregnancies undergoing cesarean section under spinal anesthesia.BMC anesthesiology · 2025Article
- Prevention of spinal anaesthesia-induced hypotension during caesarean section using noninvasive cardiac output monitoring: A randomised clinical trial.European journal of anaesthesiology and intensive care · 2025Article
- Preoperative inferior vena cava-abdominal aorta ultrasound examination to guide the positioning of spinal anesthesia to reduce post-spinal hypotension: a prospective, randomized trial.Frontiers in medicine · 2025Article
- Does Pelvic Floor Muscle Exercise Change the Hemodynamic Responses of the Inferior Vena Cava in Pregnant Women? A Prospective-Controlled Study.International urogynecology journal · 2024Article
- Inferior vena cava collapsibility index: a unique point-of-care ultrasound tool to assess postinduction hypotension?Canadian journal of anaesthesia = Journal canadien d'anesthesie · 2024Article
- Inferior vena cava ultrasound and other techniques for assessment of intravascular and extravascular volume: an update.Clinical kidney journal · 2023Review
- Correlation between pleth variability index and ultrasonic inferior vena cava-collapsibility index in parturients with twin pregnancies undergoing cesarean section under spinal anesthesia.European journal of medical research · 2022Article
- Association between Preoperative Retrograde Hepatic Vein Flow and Acute Kidney Injury after Cardiac Surgery.Diagnostics (Basel, Switzerland) · 2022Article
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeHypotension is common following spinal anesthesia (SA) during elective Cesarean delivery (CD). Although common practice is to alleviate inferior vena cava (IVC) compression, limited evidence supports a 15° tilt for CD. We measured collapsibility of the IVC in supine and 15° left lateral tilt positions with ultrasound before and after SA and phenylephrine infusion in term parturients.
methodsTwenty term parturients scheduled for CD were recruited for this prospective study. Ultrasound measurements of the IVC were taken 1) supine before SA, 2) tilted 15° before SA, 3) supine after SA, and 4) tilted 15° after SA. A phenylephrine infusion was begun after injection of SA. The primary outcome was to evaluate the impact of position on the IVC collapsibility index (IVCCI): a measure of the difference between the maximum and minimum IVC diameter with respiration.
resultsThe mean (standard deviation) IVCCI (%) before SA was higher in the supine 19.5 (8.0) than in the tilted 15.0 (6.4) position (mean difference, 4.5; 95% confidence interval [CI], 0.1 to 8.9; P = 0.04). After SA, there was no significant difference between IVCCI (%) in the supine 17.8 (8.3) and tilted 14.2 (6.9) position (mean difference, 3.5; 95% CI, -0.9 to 7.9; P = 0.13). There was no correlation between the pre-spinal IVVCI measurements and the quantity of phenylephrine used during the surgery.
conclusionThe IVCCI was lower in the 15° tilt position than in the supine position, but not after SA with a phenylephrine infusion. Ultrasound imaging can help identify IVC compression.
trial registrationwww.clinicaltrials.gov (NCT03410199); registered 18 January 2018.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.