Figure 1 Comparison of blood pressure and pulse rate changes in the 2 groups before anesthesia and at 90 min during the operation (x±s). (A) Comparison of the changes in the systolic blood pressure (SBP) level of the 2 groups before anesthesia and at 90 min during the operation. The SBP levels of the patients in the study group were (118.35±8.67) mmHg and (120.54±7.35) mmHg before anesthesia and at 90 min during the operation. The SBP levels of the patients in the reference group were (119.17±8.74) mmHg and (132.64±7.45) mmHg before anesthesia and at 90 min during the operation. * Indicates that there is a significant difference in the SBP level of patients in the reference group before anesthesia and at 90 min during the operation (t=7.691, P<0.05); ** indicates that there is a significant difference in the SBP level at 90 minutes during the operation between the 2 groups (t=7.582, P<0.01). (B) Shows the comparison of the changes in the diastolic blood pressure (DBP) levels between the 2 groups before anesthesia and at 90 min during the operation. The DBP levels of the patients in the study group were (73.64±6.35) mmHg and (75.25±6.96) mmHg before anesthesia and at 90 min during the operation. The DBP levels of the patients in the reference group were (74.12±6.19) mmHg and (88.59±7.17) mmHg before anesthesia and at 90 min during the operation. * Indicates that there is a significant difference in the DBP level of the reference group before anesthesia and at 90 min during the operation (t=10.017, P<0.05); ** indicates that there is a significant difference between the 2 groups in DBP levels at 90 min during the operation (t=8.754, P<0.01).(C) Comparison of the pulse rate changes of the 2 groups before anesthesia and 90 min during the operation. The pulse rates of the patients in the study group were (71.33±6.54) beats/min and (73.14±6.39) beats/min before anesthesia and during the operation. The pulse rates of the patients in the reference group were (71.52±6.63) times/min, (82.17±6.14) times/min. * Indicates that there is a significant difference in the pulse rate in the reference group before anesthesia and 90 min during the operation (t=7.728, P<0.05); ** indicates that there is a significant difference in pulse rate at 90 min between the 2 groups (t=6.682, P<0.01).