Monitoring of the level of sedation during loco-regional anaesthesia for ocular surgery using Bispectral Index (BIS)

Abstract

Aim. To increase the performance of retrobulbar anaesthetic block for surgery of the anterior eyeball pole by sedative/hypnotic drugs with a BIS monitoring of the sedative/hypnotic effect.

Material and method. The efficacy of the potentiation of the retrobulbar anaesthetic block with benzodiazepine, pethidine and propofol was studied using BIS monitoring. The study was performed on three homogenous groups of patients (age, sex, ASA score, type of operations), the following parameters being studied: the onset time of the sedative/hypnotic effect, the length and depth of the sedative effect, the awakening time.

Results. The midazolam+pethidine combination produced the deepest sedation effect, having the mildest and most pleasant awakening, while propofol proved to be the easiest to handle.

Conclusions. 1. The systemic administration of sedative/hypnotic drugs significantly increases the performances of the retrobulbar block for anterior eyeball pole surgery. 2. The monitoring of the sedative/hypnotic effect using BIS allows a better control of the necessary dosage of sedative/hypnotic drugs doses.

Key words: loco-regional anaesthesia, ocular surgery, level of sedation, bispectral index (BIS)

Jurnalul Român de Anestezie Terapie intensivă 2003 Vol.10 Nr.2, 101-107

Indexul de analiză bispectrală a EEG (BIS) – metodă de monitorizare a profunzimii sedării în tehnicile de anestezie loco-regională potenţată sistemic în chirurgia oculară