BMC Anesthesiology

Table 2 Quality assessment of included studies using QUADAS-2

From: Respiratory variation in peripheral arterial blood flow peak velocity to predict fluid responsiveness in mechanically ventilated patients: a systematic review and meta-analysis

Study	Risk of bias				Applicability concerns
Study	Patient selection	Index test	Reference standard	Time and flow	Patient selection	Index test	Reference standard
Roehrig C [6]	●	○	●	○	●	○	●
Brennan JM [7]	●	○	●	○	●	○	●
Monge García MI [8]	●	○	○	○	○	○	●
Yin WH [9]	?	○	○	○	○	○	●
Song Y [10]	●	○	○	○	●	○	●
Ibarra-Estrada MÁ [11]	○	○	○	○	○	○	○
Zhu W [12]	?	?	○	○	○	?	○
LU N [13]^a	?	?	○	○	○	?	○
LU N [13]^b	?	?	○	○	○	?	○

○low risk ●high risk? unclear risk
^a: the peripheral artery is the brachial artery; ^b:the peripheral artery is the carotid artery

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ISSN: 1471-2253

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