ICU Vivas · Equipment & physics
Data viva — the arterial trace and the capnogram
A data viva on a line-cuff MAP discrepancy and a capnogram — dynamic response, levelling and damping, and whole-waveform capnography.
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Prompt
An arterial trace whose MAP differs from the cuff by 14 mmHg, and a time capnogram, from a ventilated patient.
Stimulus
You are shown an arterial pressure trace whose MAP is 14 mmHg lower than the simultaneous cuff MAP, and a time capnogram from the same ventilated patient.[1][3]
References3ShowHide
- [1]Zamith N, Walker C, Scully T, et al. Should I Target the Blood Pressure from the Arterial Line or the Cuff? A Practical Approach for Dealing with Widely Discordant Measurements. Journal of clinical medicine, 2025.PMID 41464519
- [2]Devasahayam S, Gangadharan N, Surekha C, et al. Intra-arterial blood pressure measurement: sources of error and solutions. Medical & biological engineering & computing, 2022.PMID 35235133
- [3]Nassar BS, Schmidt GA Capnography During Critical Illness. Chest, 2016.PMID 26447854