For elderly patients scheduled for painless gastroenterological endoscopy, remimazolam 0.2mg/kg and esketamine 0.15mg/kg are used for anesthesia induction. During the operation, the dosage is adjusted according to the patient's level of sedation.

During the surgery, the bilateral frequency index of brain electricity was recorded every 2 minutes. The bispectral index of electroencephalogram is mainly used to assess the depth of sedation, the effect of anesthesia and the state of consciousness. Its value range is from 0 to 100. The higher the value, the higher the degree of consciousness; the lower the value, the deeper the degree of brain inhibition.

The heart rate was recorded every 2 minutes during the operation. The normal heart rate is 60 to 100 beats per minute.

The blood pressure was recorded every 2 minutes during the operation.

The MOAA/S, which stands for Modified Observer's Assessment of Alertness/Sedation Scale, assesses the patient's response to sounds or physical stimuli and is scored on a scale of 6 levels:

Level 5: Normal alertness, quick response to normal tone of voice; Level 4: Slow response to normal tone of voice; Level 3: Only responds to loud or repeated calls; Level 2: Only responds to slight shaking or tactile stimuli; Level 1: No response to slight shaking or tactile stimuli, but responds to pain stimuli (such as pinching the trapezius muscle); Level 0: No response to pain stimuli. During the surgery, the MOAA/S value was recorded every 2 minutes.

Level 0: No hiccups; Level 1: Single mild hiccup; Level 2: Multiple mild hiccups, not affecting the surgical operation (≤ 5 seconds); Level 3: Severe hiccups, affecting the surgical operation (> 5 seconds).

Level 0: No choking coughing action; Level 1: A single mild choking coughing action; Level 2: Multiple mild choking coughing actions, which do not affect the surgical operation (≤ 5 seconds); Level 3: Severe coughing (> 5 seconds).

Level 1: No activity: Level 2: Slight activity, does not affect operation: Level 3: Obvious activity, has some impact on surgical operation; Level 4: Limb twisting, significantly affects operation.

No; moderate (by pressing the abdomen, the abdominal wall muscles become stiff, which affects the colonoscopy examination); Severe (by pressing the abdomen, the abdominal wall muscles become stiff, severely affecting the colonoscopy examination)

The induction time of anesthesia is the period from the start of administering remimazolam and remifentanil (esketamine) until the patient loses consciousness and is ready for surgery. The operation time is the duration from the beginning of the gastroscopy procedure to the end of the colonoscopy. The period of full consciousness is from the last administration of anesthetic drugs until the patient regains consciousness. The anesthesia recovery time is the duration from the time the patient regains consciousness to the time when the Aldrete score reaches 9 points.

Record the consumption amounts of lidocaine, esketamine, remifentanil and remimazolam during the operation

Adverse events include intraoperative respiratory depression, hypotension, hypertension, bradycardia, tachycardia, arrhythmia, hiccups, choking cough, body movement, abdominal wall rigidity; postoperative nausea, vomiting, headache, dizziness, visual impairment, hallucination, intraoperative awareness, etc.

The patient's satisfaction was measured using the visual analogue scale method. A 10-cm movable ruler with 10 marks was used, with the two ends marked as 0 and 10 respectively. The patient was asked to mark the corresponding position on the ruler that represented their satisfaction level. 0 represented extreme dissatisfaction and 10 represented very satisfaction.

The satisfaction of the doctors was measured using the visual analogue scale method. A 10-cm movable ruler was used, marked with 10 graduations, with the two ends representing 0 points and 10 points respectively. The doctors were asked to mark the corresponding position on the ruler that best represented their satisfaction level. 0 points indicated extreme dissatisfaction, while 10 points indicated very high satisfaction.

The patient's pain score is classified into four levels: no pain, mild abdominal distension pain (pain is present only when pressed; no pain when not pressed), moderate abdominal pain (pain persists even when not pressed, but is tolerable), and severe abdominal pain (pain is unbearable).

The Telephone Interview for Cognitive Status is a tool used to assess cognitive functions, especially suitable for remote screening of cognitive impairments. TICS is a standardized telephone interview scale that evaluates the cognitive functions of the subjects through questions, including orientation, memory, language ability, calculation ability, etc. It consists of 13 items, with a total score ranging from 0 to 50, and a lower score indicates more severe cognitive impairment.

1. Applicable population: Elderly patients, especially those who have undergone surgery or have cognitive impairments.
2. Assessment items: It includes 11 indicators, such as acute onset, attention disorder, disordered thinking, disorientation, etc. Each item is scored from 0 to 3 or 0 to 4 points.
3. Diagnostic criteria: Total score: Below 19 points indicates no delirium, 20 to 22 points indicates suspicion, and above 22 points confirms the diagnosis.