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Assessment of association of cardiac parameters with anesthesia levels

Backgraound: It is recommended to use BIS (BISpectral) to determine anesthesia levels. Currently, due to low capacity in Iran, anesthesiologists use cardiac indices, such as pulse rates and blood pressure to detect anesthesia levels. This study was designed to assess association of cardiac parameters with anesthesia levels measured by brain function. Methods: In this descriptive study, 14 patients candidate for operation in Milad hospital were studied. Patientsʹ information, including systolic blood pressure, pulse rate and BIS (BISpectral) index were simultaneously registered by Rugloop software using Datex-ohmeda S5. Cut-off of 75 percent by Delphi method was considered as agreement, and percent of disagreement of 3 cardiac parameters, including blood pressure, pulse rate and both blood pressure and pulse rate were assessed. Results: 14 patients with mean age (± standard deviation) of 43.3±12.6 years were studied. All patients experienced moderate (BIS 35-65) and mild (65-85) level of anesthesia during operation. Percent agreement of BIS with systolic blood pressure, pulse rate and both systolic blood pressure and pulse rate was 7.1%, 21.4% and 14.3%, respectively. Mean percent agreement of BIS with systolic blood pressure, pulse rate and both systolic blood pressure and pulse rate was 51.4%, 58.2% and 60.6%, respectively. Conclusion: It seems that cardiac parameters are not able to determine anesthesia levels. So, it is better to use BIS tools and processors of brain signals.