Clinical utility of microaxial flow pump fiber-optic pressure sensor for real-time hemodynamic monitoring in cardiogenic shock

Q: What are the key findings of this study?

Impella 5.5 Placement Signal mean pressure showed strong correlation (r=0.823) and a mean bias of -4.9 mmHg (95% CI -6.2 to -3.5) compared to radial arterial line pressure in cardiogenic shock.

Q: What is the clinical evidence from this study?

Study design: Cohort. Population: Cardiogenic shock supported with Impella 5.5 (n=53). Intervention: Impella 5.5 fiber-optic pressure sensor Placement Signal (PS) monitoring vs. Invasive radial arterial line pressure (ALP) measurements. Primary outcome: Agreement (mean signal bias via Bland-Altman analysis) and correlation between Impella 5.5 Placement Signal mean pressure and invasive radial arterial line mean pressure (MD -4.9 mmHg (r = 0.823), 95% CI -6.2 to -3.5, p=<0.001).

Q: What does this research mean for the field?

The Impella 5.5 microaxial flow pump integrated fiber-optic pressure sensor provides accurate, real-time aortic pressure measurements that strongly correlate with invasive arterial line pressures independently of device performance levels and duration of support. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

Q: What question did this study set out to answer?

To assess the accuracy, agreement, and trending ability of the Impella 5.5 microaxial flow pump fiber-optic placement signal against invasive radial arterial line pressure measurements.

Lukas Ruoff; ROXANA MOAYEDIFAR; Anne‐Kristin Schaefer; Oliver Seibert; Barbara Karner; M. Bernardi; Robert Zilberszac; Peter Schellongowski; Julia Riebandt; Daniel Zimpfer; Thomas Schlöglhofer

doi:10.3389/fcvm.2026.1977213

November 9, 2026Frontiers in Cardiovascular MedicineOpen Access

Clinical utility of microaxial flow pump fiber-optic pressure sensor for real-time hemodynamic monitoring in cardiogenic shock

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Key result

Impella 5.5 Placement Signal closely tracks radial arterial line pressure with a ~5-mmHg mean bias.

MD -4.9 mmHg (r = 0.823)
95% CI -6.2 to -3.5
P<0.001
n=53

Why the study?

The Impella 5.5 features an integrated fiber-optic sensor for real-time aortic pressure monitoring via the Placement Signal (PS), but the reliability and accuracy of the PS compared with invasive arterial line pressure (ALP) measurements had not been systematically evaluated.

Does the Impella 5.5 integrated fiber-optic Placement Signal provide accurate and concordant real-time blood pressure monitoring compared with invasive radial arterial line pressure in patients with cardiogenic shock?

Key Points

To assess the accuracy, agreement, and trending ability of the Impella 5.5 microaxial flow pump fiber-optic placement signal against invasive radial arterial line pressure measurements.
Analyzed 209,183 data points from 53 patients with cardiogenic shock receiving Impella 5.5 mechanical circulatory support across up to 29 postoperative days.
Compared high-resolution (25 samples per second) placement signal pressure waveforms to invasive radial arterial line pressure values across systolic, diastolic, and mean measurements.
Evaluated agreement and signal stability using Bland-Altman analyses, linear mixed-effects modeling, percentage error, error field concordance, and regressions across support levels and postoperative days.
Mean signals showed a bias of −4.9 mmHg (95% CI: −6.2 to −3.5), strong correlation (r = 0.823), a percentage error of 20.3%, and an error field concordance of 43.4 ± 51.4%.
Diastolic signals showed a bias of −2.4 mmHg (95% CI: −3.7 to −1.0; r = 0.793), whereas systolic signals showed a bias of −13.8 mmHg (95% CI: −16.3 to −11.2; r = 0.777).
Signal drift across postoperative days was minimal (β = −0.135 mmHg per day, 95% CI: −0.147 to −0.123, p < 0.001) and had no significant association with performance levels (β = 0.014 mmHg per level, 95% CI: −0.023 to 0.050, p = 0.467), with discrepancies within ± 3.9 mmHg across pressure ranges.

Study Design

Type

Cohort (n=53)

Multicenter

No

Structured PICO

Does the Impella 5.5 integrated fiber-optic Placement Signal provide accurate and concordant real-time blood pressure monitoring compared with invasive radial arterial line pressure in patients with cardiogenic shock?

P

Population

53 adult ICU patients with cardiogenic shock (mean age 57.3 years, 13% female) supported with the Impella 5.5 microaxial flow pump for a median of 11.0 days.

E

Exposure

Real-time central aortic pressure monitoring via the Impella 5.5 integrated fiber-optic pressure sensor Placement Signal (PS, sampled at 25 Hz) over a median support duration of 11.0 (IQR 8.0; 18.3) days (up to 28 days).

C

Comparator

Invasive peripheral radial arterial line pressure (ALP) measurements recorded via fluid-filled pressure transducers (TrueWave) in the operating room and ICU at 2 to 15 minute intervals.

O

Outcome

Accuracy and agreement between Impella 5.5 PS-derived pressure signals (mean, systolic, and diastolic) and reference radial ALP measurements, assessed primarily by Bland-Altman bias (PS minus ALP) over up to 28 postoperative days.surrogate

Main Result

Mean Difference: -4.9 (95% CI -6.2–-3.5)

Absolute Event Rate: 70.5% vs 76%

p-value: p=<0.001

The Impella 5.5 fiber-optic Placement Signal correlates strongly with invasive radial arterial pressure with minimal drift or sensitivity to pump support levels, supporting its clinical utility as a reliable complementary central hemodynamic monitor in cardiogenic shock.

Limitations

Single-center, retrospective study design with a limited number of patients (n=53)
13% of Impella records were lost due to limited storage capacity of the automated Impella controller circular buffer
Different anatomical measurement locations (central ascending aorta vs. peripheral radial artery) affecting absolute systolic accuracy
Potential intermittent device malposition and motion artifacts during patient mobilization
Single-center, retrospective cohort design with a limited sample size (53 patients)
Loss of 13% of Impella high-resolution records due to limited storage capacity (circular buffer) of the Automated Impella Controller
Different measurement sites (central ascending aorta for PS vs. peripheral radial artery for ALP) limiting direct interchangeability, particularly for systolic pressure
Potential confounding from intermittent device malposition (measuring LV pressure) and motion artifacts during mobilization

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Implication

May support Impella 5.5 placement signal as complementary monitor in cardiogenic shock; leaves open prospective validation against outcomes before routine adoption.

Abstract

Background The Impella 5.5 has demonstrated clinical efficacy in managing cardiogenic shock, featuring an integrated fiber-optic sensor facilitating real-time aortic pressure monitoring via the Placement Signal (PS); however, the reliability of the PS has not been systematically evaluated. The objective of this study was to assess its accuracy by correlating PS with invasive arterial line pressure (ALP) measurements. Methods We compared Impella 5.5 PS data (25 samples per second) with systolic, diastolic, and mean ALP values. Impella signals were derived from detected systolic and diastolic PS components. In addition to Bland-Altman analyses, regression analyses, percentage error, and trending ability using error field concordance analysis were evaluated. Secondary outcomes included bias analyses across postoperative days (PODs), performance level (P-level), and reference pressure ranges. Results From 209,183 data points across 53 patients, assessment of agreement revealed a mean signal bias of −4.9 mmHg (95% CI: −6.2 to −3.5), with strong correlations identified between mean ( r = 0.823), diastolic [ r = 0.793, bias: −2.4 mmHg (95% CI: −3.7 to −1.0)], and systolic signals [ r = 0.777, bias: −13.8 mmHg (95% CI: −16.3 to −11.2)]. The mean signals resulted in a percentage a percentage error of 20.3% and an error field concordance of 43.4 ± 51.4%. Poor association was found to PODs [ β = −0.135 mmHg per POD (95% CI: −0.147 to −0.123), p < 0.001] and no significant association to P-levels [ β = 0.014 mmHg per P-level (95% CI: −0.023 to 0.050), p = 0.467]. Minor discrepancies within ± 3.9 mmHg across pressure ranges were observed. Conclusion This study assessed invasive hemodynamic data recorded with the Impella 5.5 demonstrating strong agreement and correlation with clinical reference signals. The fiber-optic pressure sensor indicated statistical concordant, suggesting potential trending ability. Negligible magnitude in signal drift was observed, and measurements were independent of support settings and pressure ranges. Reliable aortic pressure waveform assessment during microaxial flow pump therapy may enhance hemodynamic monitoring.

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Cite This Study

Ruoff et al. (2026) conducted a cohort in Cardiogenic shock supported with Impella 5.5 (n=53). Impella 5.5 fiber-optic pressure sensor Placement Signal (PS) monitoring vs. Invasive radial arterial line pressure (ALP) measurements was evaluated on Agreement (mean signal bias via Bland-Altman analysis) and correlation between Impella 5.5 Placement Signal mean pressure and invasive radial arterial line mean pressure (MD -4.9 mmHg (r = 0.823), 95% CI -6.2 to -3.5, p=<0.001). Impella 5.5 Placement Signal mean pressure showed strong correlation (r=0.823) and a mean bias of -4.9 mmHg (95% CI -6.2 to -3.5) compared to radial arterial line pressure in cardiogenic shock.

synapsesocial.com/papers/6af354495b67d29976ea07d7 https://doi.org/10.3389/fcvm.2026.1977213

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Clinical utility of microaxial flow pump fiber-optic pressure sensor for real-time hemodynamic monitoring in cardiogenic shock

Key Points

Study Design

Structured PICO

Main Result

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Clinical utility of microaxial flow pump fiber-optic pressure sensor for real-time hemodynamic monitoring in cardiogenic shock

Key Points

Study Design

Structured PICO

Main Result

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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