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Table 1 Characteristics of Included Studies

From: The effectiveness of high-flow nasal cannula during sedated digestive endoscopy: a systematic review and meta-analysis

Author (Year) NCT No. Country Population Endoscopic method Hypoxemia definition Hypoxemia risk* Outcome#
Kim 2021 [22] NCT03872674 Korea 72 ERCP SpO2 < 90% Low
Teng 2019 [26] NCT03138850 Taiwan 101 Esophagogastroduodenoscopy SpO2 < 90% Low
Mazzeffi 2021[27] NCT03028688 America 262 Esophagogastroduodenoscopy SpO2 < 92% Low
Lin 2019 [21] NCT03332433 China 1994 Gastroscopy SpO2 < 90% Low
Nay 2021 [28] NCT03829293 France 379 Gastrointestinal endoscopy SpO2 < 92% High
Riccio 2019 [23] NCT03148262 America 59 Colonoscopy SpO2 < 90% High
Thiruvenkatarajan 2021 [24] CTRN12619000397112 Australia 131 ERCP SpO2 < 90% High
  1. ERCP endoscopic retrograde cholangiopancreatography
  2. *High: patients were obese (BMI > 30), or had obstructive sleep apnoea syndrome, or were ASA physical status 3 or 4; Low: others
  3. #Outcome include: Hypoxemia; Need for airway interventions