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. 2018 Jun;46(3):229-232.
doi: 10.5152/TJAR.2018.87059. Epub 2018 Mar 1.

Effects of Premedication on Heart Rate Variability at Induction of Anaesthesia: Comparison between Midazolam and Hydroxyzine

Tomoki Nishiyama  1
Affiliations

Effects of Premedication on Heart Rate Variability at Induction of Anaesthesia: Comparison between Midazolam and Hydroxyzine

Tomoki Nishiyama. Turk J Anaesthesiol Reanim. 2018 Jun.

Abstract

Objective: The present study was performed to compare the effects of midazolam premedication, which is useful for its anti-anxiety and amnesic effects, with antihistamine hydroxyzine on cardiac sympathetic and parasympathetic activities using heart rate variability (HRV) at induction of anaesthesia.

Methods: Eighty patients aged 40-60 years, with an American Society of Anaesthesiologists (ASA) physical status of I or II and undergoing general anaesthesia for neck and body surface surgery were randomised equally into midazolam and hydroxyzine groups. As a premedication, midazolam 0.06 mg kg-1 with atropine 0.5 mg (midazolam group) or hydroxyzine 1 mg kg-1 with atropine 0.5 mg (hydroxyzine group) were intramuscularly administered 15 min and 30 min before anaesthesia induction, respectively. Anaesthesia was induced with midazolam 0.1 mg kg-1 and thiopental 3 mg kg-1. Oro-tracheal intubation was facilitated with vecuronium 0.15 mg kg-1. Blood pressure, heart rate and HRV were measured at predetermined time points for 10 min after intubation.

Results: Systolic blood pressure and heart rate significantly increased after intubation in both groups and the increase was greater in the hydroxyzine group. The high frequency (HF) component decreased significantly in both groups, and no difference was found between the two groups. The low frequency component/HF ratio significantly increased in the hydroxyzine group but did not change in the midazolam group.

Conclusion: Midazolam but not hydroxyzine premedication inhibited sympathetic activation at induction of anaesthesia.

Keywords: Premedication; anaesthesia induction; heart rate variability; hydroxyzine; midazolam.

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Conflict of interest statement

Conflict of Interest: No conflict of interest was declared by the author.

Figures

Figure 1
Figure 1
Blood pressure changes at predetermined time points *p<0.05 vs. the value before induction, +p<0.05 vs. H group. H: hydroxyzine; M: midazolam; bars show standard deviation
Figure 2
Figure 2
Heart rate changes at predetermined time points *p<0.05 vs. the value before induction, +p<0.05 vs. H group. H: hydroxyzine; M: midazolam; bars show standard deviation
Figure 3
Figure 3
High frequency component changes at predetermined time points *p<0.05 vs. the value before induction. H: hydroxyzine; M: midazolam; bars show standard deviation
Figure 4
Figure 4
HF/LF component changes at predetermined time points *p<0.05 vs. the value before induction, +p<0.05 vs. H group. H: hydroxyzine; M: midazolam; HF: high frequency; LF: low frequency; bars show standard deviation
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Comment in

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