Key result
Positive pressure ventilation during anesthesia is linked to reversed RSA regardless of anesthesia depth.
Why the study?
The relationship between heart rate and depth of anaesthesia during positive pressure ventilation was investigated to understand respiratory sinus arrhythmia behavior.
Does the level of enflurane or isoflurane anaesthesia affect respiratory sinus arrhythmia during positive pressure ventilation?
Observational (n=28)
Does the level of enflurane or isoflurane anaesthesia affect respiratory sinus arrhythmia during positive pressure ventilation?
Respiratory sinus arrhythmia is reversed during positive pressure ventilation and persists regardless of the depth of enflurane or isoflurane anaesthesia.
Reversed respiratory sinus arrhythmia during positive pressure ventilation warrants cautious heart rate interpretation; leaves open its utility for assessing anaesthesia depth.
In order to study the relationship between heart rate and depth of anaesthesia, respiratory sinus arrhythmia (RSA) was investigated during enflurane and isoflurane anaesthesia in 28 patients (15-39 years). Positive pressure ventilation (six breaths min-1) was used. Respiratory sinus arrhythmia was evaluated during light anaesthesia, deep anaesthesia (burst suppression in EEG) and light anaesthesia again by using signal averaging technique. In most patients, decrease of the heart rate was seen during inspiration (positive tracheal pressure), and increase during expiration. Respiratory sinus arrhythmia did not disappear in deep anaesthesia. Inter-individual variation in the magnitude and phase relationship of respiratory sinus arrhythmia was considerable, and was not associated to the level of anaesthesia.
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Yli‐Hankala et al. (1991) conducted an observational in Patients undergoing anaesthesia (n=28). Positive pressure ventilation during anaesthesia was evaluated on Respiratory sinus arrhythmia (RSA) magnitude and phase relationship. Positive pressure ventilation during anaesthesia reversed respiratory sinus arrhythmia, causing heart rate to decrease during inspiration and increase during expiration, regardless of anaesthesia depth.
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