A BIS monitor is a gadget that is used in observing a patients anesthesia depth during postoperative and surgical procedures.

The BIS monitors estimate and note the patients consciousness level during sedation by studying their EEG or electroencephalogram Monitoring sedation can be hard due to the effects of sedative medications that differ between patients and because most of the sedative drugs have interactive effects. BIS monitors now start being useful from this stage.

The responsible care givers through the BIS monitors can now effectively be able to analyses and regulate the anesthesia depth of the patient. They can customize the precise sedative and dose anesthetic medicine and sedative so as to decrease the patient awareness and recalling of the tragic experience at the operation room. In enabling today’s anesthetic doses prediction on patients BIS monitors plays a leading role mainly on cerebral cortical responses case. BIS monitors today are extensively used in ICU, (O.R) operating rooms, and other clinical environs. In addition, during the process of outpatient surgery the BIS have also proved to be handy. It is with this overview that his paper will discuss how a BIS monitor works, its advantages and disadvantages and lastly give a conclusion on the findings.

How it works

The monitoring gadget has an inbuilt sensor, monitor, and interface cables for the patient, and signal converters for the digital data. The machinery is also assessable as a unit that can be interfaced with other monitoring systems from other manufacturers.

There is a self-bonding agent incorporated within the inbuilt sensors that are non-intrusive, much like in a general EEG pad. After alcohol has been used to wipe the patient’s temple and forehead to dry the skin, it will in a way of guarantee a superior quality signal is achieved. The machines are either placed on the patient’s forehead, or temples. It then sends the collected information to the BIS engine for possible conversion. The engine will then process the information according to an algorithm that links specific EGG features to create the BIS index. This index is a number displayed on the monitor that is between 0 -100 and mirrors the sedation level of the patients with no brain activity have a 0 rate on the BIS.

If the patient has an average reading of 40 to 60 in the machine it means that they well sedated and therefore have a less chance of awareness and possible intraoperative awakening. In addition other relevant information also displayed in the monitor. The BIS, for example, is a vivid depiction of the BIS index rate over time. It can aid in analyzing changes in the consciousness levels of a patient in reaction to, for example, stimulation during procedure or administration of the drug.

Other additional data shown include: the subdual ratio number (SR) and the signal quality index bar (SQI). The SQI bar measures the signal reliability; the monitor also shows an (EMG) electromyography bar graph, and a single-channel EEG waveform which is likely being used by the SQI to determine if the BIS indexes being displayed are dependable.

Operating Room Advantages of BSI

Some of the advantages of using a BIS monitor are that it lessens the anesthetics intake agents. The dose requirements for anesthetics vary widely between patients. The right concentration or dose for a patient in one condition may demonstrate to be extreme for the same patient in another state. Most Certified Registered Nurse Anesthetist and Anesthesiologists (CRNA) are taught to govern administer anesthetic medication based on patients movements, hemodynamic status and weight. Analysis has revealed that the usage of BIS to lead administration of anesthetics allows drug delivery optimization to the needs of individual patients. In the aspect, avoid the possibility of under dosage or overdose of anesthetic agents

A study confirmed that the incorporation of propofol rates in patients undergoing surgery is lessened through the application. They performed a randomized prospective study that included forty patients undertaking (CABG) elective coronary artery bypass grafting. In the study, there were 20 patients in the BIS group (propofol titrated to maintain a BIS value 40-50), and the regular practice group had 20 patients (received propofol at a target of 3 mcg/ml). The study showed that there was a 30% propofol reduction in the BIS group.

Another advantage of using the BIS monitor during surgery is it lessens the awareness incidences from happening during surgery. The type of surgery procedure mostly dictates how the intraoperative awareness incident will be. In a trauma study, patients have reported the highest intraoperative incidences awareness between 11- 43% while cardiac surgery patients reported rates of 1.14% (Health Quality, 2004).




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