Efficacy of a continuous non-invasive arterial blood pressure monitor system for bronchoscope diagnosis and treatment under general anesthesia

Abstract

Objective To compare continuous non-invasive arterial blood pressure (CNAP) monitoring with non-invasive blood pressure (NIBP) monitoring in anesthesia monitoring application value of bronchoscope diagnosis and treatment, and to find whether the CNAP can improve the detection rate of hypotension and detect low blood pressure earlier so that improve the safety of patients. Methods Twenty patients undergoing bronchoscope diagnosis and treatment under general anesthesia from outpatient were included in this study. The NIBP monitoring was put on one side of the upper limb and the CNAP monitoring was connected to the other side upper limb before inducement of general anesthesia. Both connections were kept until the end of operation. The systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP) of the CNAP were recorded one time per minute whereas the SBP, DBP and MAP of NIBP were recorded one time every 3 min. The low blood pressure (SBP<80 mmHg, 1 mmHg=0.133 kPa) frequency of CNAP and NIBP were respectively counted. The low blood pressure detection rate and the hypotension checkout time of NIBP and CNAP were calculated respectively. The consistency and correlation between the two blood pressure measurements were compared. At the same time, the complications of the two methods of monitoring were recorded and compared. Results The low blood pressure detection rate of CNAP and NIBP was 17.2% and 14.7% (P<0.05). The hypotension checkout time of CNAP and NIBP were (1.2±0.4) min and (3.0±0.0) min respectively (P<0.05). The SBP, DBP and MAP bias of CNAP and NIBP measurement were (1.5±8.8), (1.1±8.2) mmHg and (1.3±7.1) mmHg respectively. Consistency limits were -18.70-15.70 mmHg, -17.20-14.90 mmHg and -15.30-12.70 mmHg respectively. The proportion within the scope of the consistency of its corresponding boundary were 96.70%, 97.10% and 97.10% respectively. The correlation coefficients of SBP, DBP and MAP measured by CNAP and NIBP were 0.910, 0.861 and 0.941 respectively (P<0.05). None of the patients had complications. Conclusions CNAP is more sensitive and timely in detecting hypotension. It has higher consistency and more correlation than NIBP. Thus, CNAP can improve the safety of anesthesia monitoring for bronchoscope diagnosis and treatment. Key words: Continuous non-invasive arterial blood pressure monitoring; Bronchoscope diagnosis and treatment; Anesthesia, general