Effect of Different Body Positions on Hypoxemia During Recovery in Patients Undergoing Painless Gastroscopy and Colonoscopy
maanantai 15. kesäkuuta 2026 päivittänyt: General Hospital of Ningxia Medical University
Effects of Lateral Decubitus Head-up Position, Supine Head-up Position, and Standard Lateral Decubitus Position on Hypoxemia During Recovery in Patients Undergoing Painless Gastroscopy and Colonoscopy: A Multicenter, Three-arm Randomized Controlled Trial
Through a multicenter, three-arm randomized controlled trial design, this study aimed to compare the effects of three positioning strategies-side-lying with elevated head position, supine with elevated head position, and standard side-lying position-on the incidence of hypoxemia during the recovery phase in patients undergoing painless gastroscopy and colonoscopy.
The goal was to provide clinicians with a simple, non-invasive, and cost-effective optimization strategy.
Tutkimuksen yleiskatsaus
Tila
Rekrytointi
Yksityiskohtainen kuvaus
Painless gastroscopy and colonoscopy have become the gold standard for screening and diagnosing gastrointestinal diseases due to their high patient comfort and excellent compliance rates, with their clinical application expanding annually. This procedure is performed under intravenous general anesthesia to achieve painlessness; however, anesthetic agents exert inhibitory effects on the patient's respiratory center. Additionally, the procedural manipulation causes irritation to the airways and gastrointestinal tract, leading to a high incidence of hypoxemia during the postoperative recovery phase-the most common respiratory adverse event associated with painless gastroscopy and colonoscopy. Mild cases may prolong patient recovery time, while severe cases can result in serious complications such as hypoxic brain injury or cardiac arrest, directly compromising patient safety and healthcare experience.
Positioning is a critical non-pharmacological intervention factor influencing perioperative respiratory function in patients undergoing painless gastroscopy and colonoscopy. Different positions alter thoracic compliance, airway patency, and diaphragmatic position, thereby affecting the patient's ventilation and oxygenation status. Currently, the standard lateral decubitus position is routinely used for painless gastroscopy and colonoscopy, and it has been demonstrated to reduce the incidence of hypoxemia. However, this position presents challenges such as difficulties in patient monitoring and localized pressure-related discomfort. In contrast, the supine head-up and lateral decubitus head-up positions, by elevating the head and adjusting the body angle, effectively mitigate tongue base prolapse and improve thoracic expansion, theoretically reducing the risk of hypoxemia. Nevertheless, there is currently a lack of multicenter, large-sample, prospective randomized controlled studies to compare the efficacy and safety of these three positions in preventing hypoxemia in recovery rooms for painless gastroscopy and colonoscopy patients. Consequently, there is no unified evidence-based guideline for selecting the optimal clinical positioning.
Based on this, this study focuses on three clinically common positions and employs a multicenter, three-arm, randomized controlled parallel design to systematically investigate the effects of lateral supine with head elevated, supine with head elevated, and standard lateral position on postoperative hypoxemia in patients undergoing painless gastroscopy and colonoscopy. The aim is to fill a research gap in this field and provide high-quality evidence-based medical data to optimize postoperative position management during recovery and reduce adverse respiratory events following painless gastrointestinal endoscopy.
Special Note：Prespecified subgroup analyses will be conducted based on age (<65 vs ≥65), sex, BMI, ASA class, smoking and alcohol use, Mallampati score, anesthetic agent (clobupol or propofol), type of endoscopy (gastroscopy, colonoscopy, or gastroenteroscopy), Ramsay sedation score (2-4), pre-procedure hypoxemia, prior pulmonary surgery, OSA, respiratory disease, and intra-procedural hypoxemia (SpO₂ ≤90% for >10 seconds). The influence of heterogeneity on the primary outcome will also be evaluated.
Opintotyyppi
Interventio
Ilmoittautuminen (Arvioitu)
1617
Vaihe
- Ei sovellettavissa
Yhteystiedot ja paikat
Tässä osiossa on tutkimuksen suorittajien yhteystiedot ja tiedot siitä, missä tämä tutkimus suoritetaan.
Opiskeluyhteys
- Nimi: xiaoyong wei, Master's degree
- Puhelinnumero: 86-951-674-3252
- Sähköposti: weixy9912@126.com
Opiskelupaikat
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-
Ningxia
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Yinchuan, Ningxia, Kiina, 750001
- Rekrytointi
- General hospital of Ningxia medical university, Yinchuan, Ningxia
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Ottaa yhteyttä:
- xiaoyong wei
- Puhelinnumero: 86-951-674-3252
- Sähköposti: weixy9912@126.cm
-
-
Osallistumiskriteerit
Tutkijat etsivät ihmisiä, jotka sopivat tiettyyn kuvaukseen, jota kutsutaan kelpoisuuskriteereiksi. Joitakin esimerkkejä näistä kriteereistä ovat henkilön yleinen terveydentila tai aiemmat hoidot.
Kelpoisuusvaatimukset
Opintokelpoiset iät
- Aikuinen
- Vanhempi Aikuinen
Hyväksyy terveitä vapaaehtoisia
Ei
Kuvaus
Inclusion Criteria:
- Age ≥ 18 years.
- Both sexes.
- American Society of Anesthesiologists (ASA) physical status classification I-III.
- Scheduled for combined painless esophagogastroduodenoscopy/colonoscopy or either of the two procedures.
- Ability to understand the study protocol and provide written informed consent.
- A broad set of inclusion criteria was adopted to enroll a patient population that better reflects routine clinical practice. The study aimed to enhance the generalizability of the findings by including patients with various comorbidities, such as preprocedural hypoxemia (room-air SpO₂ ≤ 90%), history of pulmonary surgery, obstructive sleep apnea (OSA), and other pulmonary conditions (including asthma, COPD, chronic bronchitis, emphysema, and pulmonary bullae).
Exclusion Criteria:
- Severe cardiovascular or cerebrovascular diseases.
- Pregnant patients.
- History of hypersensitivity to ciprofol.
Withdrawal Criteria:
- Endotracheal intubation required during the procedure.
- Voluntary withdrawal requested by the patient or their legal representative.
Opintosuunnitelma
Tässä osiossa on tietoja tutkimussuunnitelmasta, mukaan lukien kuinka tutkimus on suunniteltu ja mitä tutkimuksella mitataan.
Miten tutkimus on suunniteltu?
Suunnittelun yksityiskohdat
- Ensisijainen käyttötarkoitus: Hoito
- Jako: Satunnaistettu
- Inventiomalli: Rinnakkaistehtävä
- Naamiointi: Yksittäinen
Aseet ja interventiot
Osallistujaryhmä / Arm |
Interventio / Hoito |
|---|---|
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Kokeellinen: lateral decubitus head-up position group (LH group)
The patient maintains the predetermined lateral position with the head of the bed elevated at 30 degrees.
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An angle measuring device is placed beside the head of the examination bed to facilitate precise adjustment of the head position.
Upon admission to the recovery room, the patient's Ramsay Sedation Scale score is assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to tactile or pain stimuli; 5 = asleep but slow to tactile or pain responses; 6 = deep sleep with no response.
Patients scoring 2-4 are immediately randomized into the study group, while those below this range are randomized after achieving the required score.
All patients are initially positioned in the left lateral decubitus position (head elevated at 0°, the same as during examination).
Patients assigned to the supine head-elevated group (SH group) are transitioned from the lateral position to supine without a headrest, with the head elevated at 30°.
An angle measuring device was placed beside the head of the examination bed to facilitate precise adjustment of the head position.
Upon admission to the recovery room, the patient's Ramsay Sedation Scale was assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to touch or pain; 5 = asleep but slow to respond to touch or pain; 6 = deep sleep with no response.
Patients scoring 2-4 were immediately randomized into the study group, while those below this range were randomized after achieving the required score.
All patients were initially positioned in the left lateral decubitus position (head elevated at 0°, the same as during examination).
Patients in the Standard Lateral Position Group (SL group) maintained their original left lateral position with the head elevated at 0°.
|
|
Kokeellinen: supine head-up position group (SH group)
The patient was transferred from a pre-existing lateral decubitus position to a supine position without a headrest, with the head of the bed elevated at 30 degrees.
|
An angle measuring device was placed beside the head of the examination bed to facilitate precise adjustment of the head position.
Upon admission to the recovery room, the patient's Ramsay Sedation Scale was assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to touch or pain; 5 = asleep but slow to respond to touch or pain; 6 = deep sleep with no response.
Patients scoring 2-4 were immediately randomized into the study group, while those below this range were randomized after achieving the required score.
All patients were initially positioned in the left lateral decubitus position (head elevated at 0°, the same as during examination).
Patients in the Standard Lateral Position Group (SL group) maintained their original left lateral position with the head elevated at 0°.
An angle measuring device is placed beside the head of the examination bed to facilitate precise adjustment of the head position.
Upon admission to the recovery room, the patient's Ramsay Sedation Scale score is assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to touch or pain; 5 = asleep but slow to respond to touch or pain; 6 = deep sleep with no response.
Patients scoring 2-4 are immediately randomized into the study group, while those below this range are randomized after achieving the required score.
Prior to enrollment, all patients remain in the left lateral position (bed head elevated 0°, consistent with the examination position).
Patients assigned to the lateral supine head-elevated group (LH group) maintain their pre-assigned lateral position with the head elevated 30°.
|
|
Kokeellinen: standard lateral decubitus position group (SL group)
Patients should maintain their original left lateral position with the head of the bed elevated at 0 degrees.
|
An angle measuring device is placed beside the head of the examination bed to facilitate precise adjustment of the head position.
Upon admission to the recovery room, the patient's Ramsay Sedation Scale score is assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to tactile or pain stimuli; 5 = asleep but slow to tactile or pain responses; 6 = deep sleep with no response.
Patients scoring 2-4 are immediately randomized into the study group, while those below this range are randomized after achieving the required score.
All patients are initially positioned in the left lateral decubitus position (head elevated at 0°, the same as during examination).
Patients assigned to the supine head-elevated group (SH group) are transitioned from the lateral position to supine without a headrest, with the head elevated at 30°.
An angle measuring device is placed beside the head of the examination bed to facilitate precise adjustment of the head position.
Upon admission to the recovery room, the patient's Ramsay Sedation Scale score is assessed by an independent investigator (the attending anesthesiologist): 1 = agitated; 2 = fully awake, calm and cooperative; 3 = drowsy but responsive to verbal commands; 4 = drowsy but responsive to touch or pain; 5 = asleep but slow to respond to touch or pain; 6 = deep sleep with no response.
Patients scoring 2-4 are immediately randomized into the study group, while those below this range are randomized after achieving the required score.
Prior to enrollment, all patients remain in the left lateral position (bed head elevated 0°, consistent with the examination position).
Patients assigned to the lateral supine head-elevated group (LH group) maintain their pre-assigned lateral position with the head elevated 30°.
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Mitä tutkimuksessa mitataan?
Ensisijaiset tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
|---|---|---|
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Incidence of recovery-phase hypoxemia
Aikaikkuna: From PACU admission until discharge, assessed up to 30 minutes
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Proportion of participants experiencing hypoxemia (SpO₂ ≤ 90% lasting >10 seconds) during the post-procedure recovery period
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From PACU admission until discharge, assessed up to 30 minutes
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Toissijaiset tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
|---|---|---|
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Kokonaisilmaantuvuus hengitysteiden toimenpiteille toipumisen aikana
Aikaikkuna: PACU:sta vastaanotosta kotiutumiseen, arvioitu jopa 30 minuuttia
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Osallistujien osuus, jotka vaativat minkä tahansa asteen hengitystietoimenpiteitä (hapen virtauksen lisääminen, leuan nostaminen, maskiventoilinta tai uudelleenintubaatio) toipumisen aikana.
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PACU:sta vastaanotosta kotiutumiseen, arvioitu jopa 30 minuuttia
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Hengityksen mukavuuspistemäärä toipumisen aikana
Aikaikkuna: PACU:n vastaanottamisesta eroon saakka, arvioitu enintään 30 minuuttia
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Potilaan ilmoittama hengitysmukavuus arvioidaan käyttäen numeerista arviointiasteikkoa (NRS), joka vaihtelee 0 (pahin epämukavuus) - 10 (suurin mukavuus)
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PACU:n vastaanottamisesta eroon saakka, arvioitu enintään 30 minuuttia
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Taky-kardian esiintyvyys toipumisvaiheessa
Aikaikkuna: Hoidon vastaanotto-osastolla saapumisesta lähtien kunnes kotiutetaan, arviointia tehdään jopa 30 minuutin ajan
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Osallistujien osuus, joilla esiintyy takykardiaa (syketaajuus >100 lyöntiä/minuutissa) toimenpiteen jälkeisellä toipumisjaksolla.
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Hoidon vastaanotto-osastolla saapumisesta lähtien kunnes kotiutetaan, arviointia tehdään jopa 30 minuutin ajan
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Bradykardian esiintyvyys toipumisvaiheessa
Aikaikkuna: PACU:hon saapumisesta lähtien kunnes kotiutetaan, arvioituna enintään 30 minuutin ajan
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Osallistujien osuus, jotka kokevat bradykardiaa (syketaajuus <50 lyöntiä/min) toipumisen aikana.
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PACU:hon saapumisesta lähtien kunnes kotiutetaan, arvioituna enintään 30 minuutin ajan
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Hypotensionin esiintyvyys toipumisen aikana
Aikaikkuna: PACU-vastaanotosta eroonpäästöön, arvioitu enintään 30 minuutin ajan
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Osallistujien osuus, jotka kokevat hypotensiota (systolinen verenpaine <80 mmHg) toipumisen aikana.
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PACU-vastaanotosta eroonpäästöön, arvioitu enintään 30 minuutin ajan
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Pahoinvoinnin tai oksentelun esiintyvyys toipumisen aikana
Aikaikkuna: PACU:n vastaanottamisesta lähtien siihen asti, kun potilas kotiutetaan, arvioitu enintään 30 minuutin ajan
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Osallistujien osuus, jotka kokevat pahoinvointia (subjektiivinen valitus) tai oksentelua (objektiivinen mahasisällön poisto) toipumisen aikana.
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PACU:n vastaanottamisesta lähtien siihen asti, kun potilas kotiutetaan, arvioitu enintään 30 minuutin ajan
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Laryngospasmin esiintyvyys toipumisvaiheessa
Aikaikkuna: PACU:n vastaanottohetkestä erotushetkeen, arvioitu enintään 30 minuuttia
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Osallistujien osuus, joilla esiintyy laryngospasmia (äkillinen ylempien hengitysteiden tukos stridorilla/kyvyttömyydellä hengittää, joka ratkeaa toimenpiteellä) toipumisen aikana.
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PACU:n vastaanottohetkestä erotushetkeen, arvioitu enintään 30 minuuttia
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Incidence of Subclinical Respiratory Depression during Recovery
Aikaikkuna: From PACU admission until discharge, assessed up to 30 minutes.
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Proportion of participants experiencing subclinical respiratory depression, defined as any episode of pulse oxygen saturation (SpO₂) in the range of 90% to <95% (inclusive of 90%, exclusive of 95%) during the post-procedure recovery period
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From PACU admission until discharge, assessed up to 30 minutes.
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Cough Severity Grade During Recovery
Aikaikkuna: From PACU admission until discharge, assessed up to 30 minutes
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Severity of cough assessed during the recovery period, graded as: Grade I: No cough, smooth breathing; Grade II: Single mild cough; Grade III: Multiple coughs lasting <15 seconds; Grade IV: Continuous coughing lasting ≥15 seconds.
Reported as the proportion of participants reaching each grade (I-IV).
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From PACU admission until discharge, assessed up to 30 minutes
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Length of Stay in Post-Anesthesia Care Unit (PACU)
Aikaikkuna: From PACU admission until discharge, assessed up to 30 minutes
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Time from admission to the post-anesthesia care unit (PACU) until discharge criteria are met (modified Aldrete score ≥9 on three consecutive assessments), recorded in minutes.
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From PACU admission until discharge, assessed up to 30 minutes
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PACU Nurse Satisfaction Score
Aikaikkuna: From PACU admission until discharge, assessed up to 30 minutes
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Nurse-assessed satisfaction with patient respiratory stability and overall recovery management, rated using a Numerical Rating Scale (NRS) ranging from 0 (lowest satisfaction) to 10 (highest satisfaction), recorded at patient discharge from the post-anesthesia care unit
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From PACU admission until discharge, assessed up to 30 minutes
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Yhteistyökumppanit ja tutkijat
Täältä löydät tähän tutkimukseen osallistuvat ihmiset ja organisaatiot.
Yhteistyökumppanit
Tutkijat
- Opintojen puheenjohtaja: Xinli Ni, Doctoral, 86-951-674-3252
Opintojen ennätyspäivät
Nämä päivämäärät seuraavat ClinicalTrials.gov-sivustolle lähetettyjen tutkimustietueiden ja yhteenvetojen edistymistä. National Library of Medicine (NLM) tarkistaa tutkimustiedot ja raportoidut tulokset varmistaakseen, että ne täyttävät tietyt laadunvalvontastandardit, ennen kuin ne julkaistaan julkisella verkkosivustolla.
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