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. 2021 Jul 9;17(1):173–180. doi: 10.1007/s11739-021-02802-z

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© The Author(s) 2021

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Fig. 2 — top: Time until signal by measurement cycles per participant (“Experience”). Bottom: Percentage of invalid measurements (the participant failed to retrieve a sufficient readable venous signal within 120 s) by experience. For subclavian measurements, mean time to signal is below 40 s after 18 attempts, compared to 25 attempts for precordial measurements. Failure rate is stable on a low level after 15 measurements in subclavian position and 25 in precordial position