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Haemodynamic changes and heart rate variability during midazolam-propofol co-induction
Ni Ni Win1, H Kohase, F Yoshikawa
1Section of Anaesthesiology and Clinical Physiology, Department of Oral Restitution, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
Anaesthesia
|May 18, 2007
Summary
Midazolam-propofol co-induction in anesthesia demonstrated compensated cardiovascular effects. This combination preserved baroreflex activity, indicated by significant changes in the low frequency/high frequency (LF/HF) ratio.
Area of Science:
- Anesthesiology
- Cardiovascular Physiology
- Autonomic Nervous System
Background:
- Anesthesia induction agents impact hemodynamic stability and autonomic nervous system balance.
- Understanding the cardiovascular effects of co-induction agents is crucial for patient safety.
- Midazolam and propofol are commonly used anesthetic agents with distinct cardiovascular profiles.
Purpose of the Study:
- To investigate the effects of midazolam-propofol co-induction on hemodynamic parameters and heart rate variability.
- To compare the cardiovascular modulatory effects of midazolam-propofol versus propofol alone during anesthesia induction.
- To assess the impact on autonomic nervous system balance using spectral analysis of heart rate variability.
Main Methods:
- Prospective, blind, randomized study involving 40 patients.
- Measurement of blood pressure, heart rate, stroke volume, and heart rate variability (low frequency, high frequency, total power, LF/HF ratio) using spectral analysis.
- Data collected at baseline, post-induction, post-intubation, and at 3 and 5 minutes post-intubation.
Main Results:
- The midazolam-propofol group exhibited compensated hemodynamic changes.
- Significant increases in the LF/HF ratio were observed in the midazolam-propofol group post-induction and post-intubation.
- These findings suggest a preserved baroreflex activity and a balanced autonomic response.
Conclusions:
- Midazolam-propofol co-induction results in compensated cardiovascular adjustments.
- The combination favorably modulates the cardiovascular system, maintaining autonomic balance.
- This co-induction strategy may offer advantages in preserving baroreflex sensitivity during anesthesia.
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