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1.Screening
1.1.Inclusion Criteria

Patients planning to undergo elective intraspinal anesthesia for prostate resection surgery

YES

Age 60 and above (including 60 years old)

YES

Body mass index (BMI) 18.5-30kg/m^2

YES

ASA grade I-III

YES

YES

1.2.Exclusion Criteria

Individuals with hearing and visual impairments

NO

BMI ≥ 30

NO

Individuals with contraindications for spinal anesthesia

NO

Severe hypertension (controlled with medication, still in stage III or above hypertension), heart failure (NYHA > II)

NO

Severe bradycardia (requiring pacemaker, <60bpm)

NO

Individuals with neurological or muscular system diseases, mental illness

NO

History of sedative, antidepressant medication use, alcoholism, and drug abuse

NO

History of severe cerebrovascular disease or complication after craniocerebral trauma (e.g., emotional disorders, language disorders)

NO

Individuals with dexmedetomidine use contraindications

NO

Individuals who are unwilling or unable to communicate

NO

1.3.Detachment Criteria

loss to follow-up

NO

Subject withdraws informed consent form

NO

Intraoperative use of other sedative drugs

NO

Change the anesthesia method to general anesthesia for patients

NO

Patients transferred to ICU after surgery

NO

2.Baseline
2.1.Age

Age

62 years old

2.2.Weight

Weight

71.5 kg

2.3.Height

Height

1.65 m

2.4.BMI

BMI

26.26 kg/m2

2.5.Degree of education

Degree of education

Middle school

2.6.ASA

ASA

2.7.Underlying disease

Underlying disease

Diabetes

3.Intraoperative indicators
3.1.Systolic pressure

Systolic pressure T1

129 mmHg

Systolic pressure T2

142 mmHg

Systolic pressure T3

126 mmHg

Systolic pressure T4

125 mmHg

Systolic pressure T5

132 mmHg

Systolic pressure T6

127 mmHg

Systolic pressure T7

118 mmHg

Systolic pressure T8

124 mmHg

Systolic pressure T9

141 mmHg

Systolic pressure T10

119 mmHg

Systolic pressure T11

127 mmHg

Systolic pressure T12

132 mmHg

Systolic pressure T13

135 mmHg

3.2.Diastolic pressure

Diastolic pressure T1

76 mmHg

Diastolic pressure T2

64 mmHg

Diastolic pressure T3

72 mmHg

Diastolic pressure T4

71 mmHg

Diastolic pressure T5

75 mmHg

Diastolic pressure T6

72 mmHg

Diastolic pressure T7

71 mmHg

Diastolic pressure T8

71 mmHg

Diastolic pressure T9

67 mmHg

Diastolic pressure T10

72 mmHg

Diastolic pressure T11

71 mmHg

Diastolic pressure T12

79 mmHg

Diastolic pressure T13

69 mmHg

3.3.Mean arterial pressure

Mean arterial pressure T1

94 mmHg

Mean arterial pressure T2

88 mmHg

Mean arterial pressure T3

91 mmHg

Mean arterial pressure T4

84 mmHg

Mean arterial pressure T5

94 mmHg

Mean arterial pressure T6

90 mmHg

Mean arterial pressure T7

85 mmHg

Mean arterial pressure T8

92 mmHg

Mean arterial pressure T9

91 mmHg

Mean arterial pressure T10

87 mmHg

Mean arterial pressure T11

94 mmHg

Mean arterial pressure T12

100 mmHg

Mean arterial pressure T13

97 mmHg

3.4.Heart rate

Heart rate T1

64 times/min

Heart rate T2

68 times/min

Heart rate T3

68 times/min

Heart rate T4

67 times/min

Heart rate T5

64 times/min

Heart rate T6

63 times/min

Heart rate T7

64 times/min

Heart rate T8

61 times/min

Heart rate T9

60 mmHg

Heart rate T10

59 times/min

Heart rate T11

57 times/min

Heart rate T12

60 times/min

Heart rate T13

61 times/min

3.5.Respiratory rate

Respiratory rate T1

17 times/min

Respiratory rate T2

18 times/min

Respiratory rate T3

14 times/min

Respiratory rate T4

15 times/min

Respiratory rate T5

13 times/min

Respiratory rate T6

12 times/min

Respiratory rate T7

16 times/min

Respiratory rate T8

19 times/min

Respiratory rate T9

18 times/min

Respiratory rate T10

17 times/min

Respiratory rate T11

18 times/min

Respiratory rate T12

15 times/min

Respiratory rate T13

16 times/min

3.6.Oxygen saturation

Oxygen saturation T1

98 %

Oxygen saturation T2

98 %

Oxygen saturation T3

98 %

Oxygen saturation T4

97 %

Oxygen saturation T5

98 %

Oxygen saturation T6

99 %

Oxygen saturation T7

98 %

Oxygen saturation T8

97 %

Oxygen saturation T9

98 %

Oxygen saturation T10

99 %

Oxygen saturation T11

99 %

Oxygen saturation T12

99 %

Oxygen saturation T13

99 %

3.7.BIS

BIS T1

93

BIS T2

97

BIS T3

98

BIS T4

86

BIS T5

90

BIS T6

92

BIS T7

93

BIS T8

75

BIS T9

72

BIS T10

75

BIS T11

88

BIS T12

94

BIS T13

92

4.Intraoperative secondary data
4.1.Puncture space

Puncture space

L2-3

4.2.Dosage of ropivacaine

Dosage of ropivacaine

20 mg

4.3.Sensory blockade plane

Sensory blockade plane

T10

4.4.Improved Bromage score

Improved Bromage score

3

4.5.

A-VAS

0

4.6.Operation duration

Operation duration

70 min

4.7.Time-on

Time-on

10:30

4.8.End time

End time

11:40

4.9.Departure time

Departure time

11:45

4.10.Total dosage of dexmedetomidine

Total dosage of dexmedetomidine

0 mg

4.11.Satisfaction
4.4.11.4.11.1、Operator satisfaction

Operator satisfaction

5

4.4.11.4.11.2、Patient satisfaction

Patient satisfaction

5

4.12.Special circumstances during surgery
4.4.12.4.12.1、Physical movement

Physical movement

NO

4.4.12.4.12.2、Hypoxemia

Hypoxemia

NO

4.4.12.4.12.3、Bradycardia

Bradycardia

NO

5.Follow-up
5.1.
5.5.1.5.1.1、1 day preoperative STAI-S

1 day preoperative STAI-S

23

5.5.1.5.1.2、Postoperative day STAI-S

Postoperative day STAI-S

20

5.2.
5.5.2.5.2.1、1 day preoperative MMSE

1 day preoperative MMSE

28

5.5.2.5.2.2、Postoperative day MMSE

Poseoperative day MMSE

30

5.5.2.5.2.3、Postoperative 1-day MMSE

Postoperative 1-day MMSE

30

5.3.Postoperative adverse reactions
5.5.3.5.3.1、Nausea

Nausea

NO

5.5.3.5.3.2、Vomit

Vomit

NO

5.5.3.5.3.3、Dizzy

Dizzy

NO

5.5.3.5.3.4、Headache

Headache

NO

5.5.3.5.3.5、Respiratory suppression

Respiratory suppression

NO