Inhalation induction using sevoflurane in children: the single-breath vital capacity technique compared to the tidal...

Area of Science:

• Anesthesiology
• Pediatric Anesthesia
• Respiratory Physiology

Background:

• Inhalation induction of anesthesia is common in children.
• The single-breath vital capacity (VC) technique is a potential alternative to conventional tidal volume (TV) breathing for anesthesia induction.

Purpose of the Study:

• To compare the efficacy and patient acceptance of the single-breath vital capacity technique versus the conventional tidal volume technique for sevoflurane inhalation induction in children.

Main Methods:

• A randomized trial involving 73 ASA 1 or 2 children aged > 5 years.
• Patients were instructed in either the vital capacity or tidal volume technique pre-operatively.
• Induction used sevoflurane 7% in 50% nitrous oxide/oxygen with a 6 L/min fresh gas flow.
• Primary outcome was time to loss of eyelash reflex; secondary outcomes included hemodynamic changes, airway tolerance, side effects, and patient preference.

Main Results:

• The vital capacity technique significantly reduced the time to loss of the eyelash reflex compared to the tidal volume technique.
• No significant differences were observed between groups in time to central myosis, achieving bispectral index values of 60 and 40, hemodynamic changes, respiratory events, or side-effect incidence.
• Children significantly preferred the vital capacity technique over the tidal volume technique.

Conclusions:

• The single-breath vital capacity technique is a suitable and faster method for inhalation anesthesia induction in children over 5 years old.
• This technique is well-tolerated and preferred by pediatric patients, suggesting improved patient experience during anesthesia induction.