Research Finds Finger-Cuff Technology May Not Reduce Hypotension—Is It Time for a Rethink?

Does real-time, non-invasive arterial pressure monitoring improve maternal safety during cesarean delivery, or is the standard oscillometric cuff enough? With maternal hypotension a common risk after spinal anesthesia in cesarean sections, many clinicians are eager for better monitoring solutions—especially technologies promising earlier detection and intervention.

Study Design: Randomized Controlled Trial in Obstetric Anesthesia

This single-center, randomized controlled trial enrolled 151 healthy women scheduled for elective cesarean delivery under spinal anesthesia. Participants were randomized to receive either:

Continuous finger-cuff arterial pressure monitoring (using the Clearsight system)

Intermittent oscillometric (standard arm cuff) monitoring

Both groups received prophylactic phenylephrine infusions to prevent hypotension. The primary endpoint was the incidence of hypotension, defined as systolic arterial pressure (SAP) <80% of baseline, from spinal anesthesia to delivery. Secondary outcomes included the area under the curve (AUC), time-weighted average (TWA), and duration of SAP below 80% and 70% of baseline.

Key Results: No Significant Difference in Hypotension Rates

The incidence of hypotension was statistically similar between groups (50.7% with finger-cuff vs. 58.1% with oscillometric monitoring; P=0.358).

No significant differences were found for AUC, TWA, or duration of hypotension.

Maternal symptoms (nausea, dizziness, bradycardia) and neonatal outcomes did not differ by monitoring strategy.

A numerical trend toward less hypotension with finger-cuff monitoring was observed, but this was not statistically significant, and the study was not powered to detect smaller differences.

Implications for Practice: Insights and Limitations

Continuous finger-cuff monitoring did not significantly reduce hypotension versus intermittent oscillometry in this setting, possibly due to the use of prophylactic vasopressors and close 1-minute interval monitoring in both groups.

Device agreement analysis showed wide limits of agreement between finger-cuff and oscillometric measurements, especially during hemodynamic instability.

Clinical intervention still depends on prompt clinician response to downward trends, regardless of device.

What’s Next for Non-Invasive Monitoring in Obstetrics?

Larger, multicenter trials are needed to determine if smaller reductions in hypotension rates are clinically meaningful.

Finger-cuff technology may offer value as a supplementary tool, especially in higher-risk populations or where continuous monitoring could prompt faster intervention.

Clinicians should continue to use standardized hypotension prevention protocols and remain mindful of device limitations.

Conclusion

While promising in theory, continuous non-invasive finger-cuff monitoring did not outperform standard oscillometric monitoring for preventing maternal hypotension after spinal anesthesia in this trial. Future research should focus on more diverse populations and larger sample sizes to fully clarify its role in obstetric anesthesia.

Key points

No significant reduction in maternal hypotension was observed with finger-cuff continuous monitoring versus standard oscillometric cuff during cesarean delivery.

Both monitoring strategies performed similarly for all secondary maternal and neonatal outcomes.

Device agreement was limited, especially during periods of hemodynamic instability.

Prophylactic phenylephrine and close monitoring intervals likely minimized differences between groups.

Larger trials are needed before changing clinical practice to favor continuous finger-cuff technology in this setting.

Citation:

Kim Y, Kim H, Yoo S, Kim JT, Gim DY, Park S-K. Non-invasive continuous versus intermittent oscillometric arterial pressure monitoring and maternal hypotension during cesarean delivery: a randomized controlled trial. Scientific Reports. 2026;16:16124. https://doi.org/10.1038/s41598-026-47307-x