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2026, Number 1

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Med Crit 2026; 40 (1)

Measurement of the time-velocity integral of the left ventricular outflow tract by subxiphoid window as an alternative to conventional measurement in critically ill patients

Olivares GJM, Barajas JG, Urbina VAG

Language: Spanish
References: 21
Page: 30-34
PDF size: 273.78 Kb.


ABSTRACT

Introduction: the left ventricular outflow tract (LVOT) velocity time integral (VTI) is an essential parameter for cardiac output assessment in critically ill patients. However, conventional apical views may be limited in patients with mechanical ventilation, altered positioning, or pleural devices. Material and methods: we conducted a retrospective observational study of 24 critically ill patients admitted between November 2024 and April 2025. LVOT VTI was measured using the apical five-chamber and modified subxiphoid views. Agreement was analyzed with the Bland-Altman method, and correlation was assessed with Pearson's coefficient. Results: mean LVOT VTI was 23.4 cm (apical) and 20.5 cm (subxiphoid). Bland-Altman analysis showed a bias of 2.51 ± 2.76, with 75% of measurements within concordance limits. Pearson's correlation demonstrated a strong association (r = 0.85, p < 0.0001). Conclusion: subxiphoid LVOT VTI measurement is a feasible and reliable alternative when conventional windows are not attainable in critically ill patients.


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