Comparison of Heart Rate Variability Among Tracheal Intubation Methods

Study Overview
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Brief Summary
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60 patients, in three group of 20 patients each, scheduled for surgery needing general anesthesia will be researched. Group A: tracheal intubation of single lumen tube using laryngoscope. Group B: single lumen tube using lightwand. Group C: double lumen endobronchial cath. During general anesthesia, the spectral power of heart rate variability at three periods: (1) preoperation baseline (2) pre-intubation and (3) post-intubation will be calculated and compared to investigate the autonomic stimulation effect of different tracheal intubation methods.

Detailed Description
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Tracheal intubation is a common practice during general anesthesia. Laryngoscope and lightwand are two commonly used methods of tracheal intubation. The autonomic stimulation of tracheal intubation may have adverse effect to the patients and have been investigated since many years ago. Conventional methods for assessing autonomic activity include measurement of blood catecholamine levels or measuring changes of the hemodynamic variables such as heart rate and blood pressure. The former is invasive and noncontinuous, and the latter is nonspecific and not accurate. Heart rate variability, a parameter derived from the spectral power of RR interval sequence in the ECG, is a non-invasive but direct measurement of autonomic activity. It is ideal and we will use this in the current research for comparing the autonomic activation during tracheal intubation of the two different methods. Totally 60 ASA class I-II patients aged 18-65 years will be recruited. 40 of these are scheduled for various kind of surgery needing general anesthesia with tracheal intubation of single lumen tube. These 40 patients will be randomly assigned into group A and B, each with 20 patients. In group A the tracheal intubation will be performed by laryngoscope, and in group B the intubation performed by lightwand. The other 20 patients of the study, the group C, are scheduled for operations needing intubation of double lumen endobronchial cath. The intubation will be performed by laryngoscope. ECG wil be recorded from at least 5 minutes before induction of general anesthesia and continue to at least 10 minutes after tracheal intubation. The induction and maintenance of anesthesia will performed as routine practice. The ECG records wil be analyzed offline. Power spectrum wil be generated by time-frequency analysis and the heart rate variability parameters at three periods (1)preoperation baseline (2) pre-intubation and (3) immediately post-intubation will be calculated and compared among the three groups.

Official Title
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Comparison of Autonomic Stimulation Among Different Tracheal Intubation Methods -- Using Non-invasive Heart Rate Variability Spectral Power as an Indicator

Conditions
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Intubation, Endotracheal

Intervention / Treatment
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* Device: devices for tracheal intubation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: ASA class I-II, age 18-65, scheduled for surgery needing general anesthesia with tracheal intubation Exclusion Criteria: history of major systemic diseases such as cardiovascular, pulmonary, renal and other diseases which affect autonomic activity.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| A<br>Patients needing intubation of single lumen tracheal tube and performed using laryngoscope | Device: devices for tracheal intubation<br>* tracheal intubation by laryngoscope or lightwand<br>|
| B<br>Patients needing intubation of single lumen tracheal tube and performed using lightwand | Device: devices for tracheal intubation<br>* tracheal intubation by laryngoscope or lightwand<br>|
| C<br>Patients needing intubation of double lumen endobronchial cath and performed using laryngoscope | Device: devices for tracheal intubation<br>* tracheal intubation by laryngoscope or lightwand<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| spectral power of heart rate variability |  | 5 minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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heart rate variability, tracheal intubation