Brazilian Journal of Anesthesiology
https://bjan-sba.org/article/doi/10.1016/j.bjane.2014.07.004
Brazilian Journal of Anesthesiology
Scientific Article

A randomised comparative study of the effect of Airtraq optical laryngoscope vs. Macintosh laryngoscope on intraocular pressure in non-ophthalmic surgery

Estudo comparativo randomizado do efeito do laringoscópio óptico Airtraq vs. laringoscópio Macintosh sobre a pressão intraocular em cirurgia não oftálmica

Bikramjit Das; Rajiv Kumar Samal; Arup Ghosh; Ratul Kundu

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Abstract

BACKGROUND: We compared intraocular pressure changes following laryngoscopy and intubation with conventional Macintosh blade and Airtraq optical laryngoscope. METHODS: Ninety adult patients were randomly assigned to study group or control group. Study group (n = 45) - Airtraq laryngoscope was used for laryngoscopy. Control group (n = 45) - conventional Macintosh laryngoscope was used for laryngoscopy. Preoperative baseline intraocular pressure was measured with Schiotz tonometer. Laryngoscopy was done as per group protocol. Intraocular pressure and haemodynamic parameters were recorded just before insertion of the device and subsequently three times at an interval of one minute after insertion of the device. RESULTS: Patient characteristics, baseline haemodynamic parameters and baseline intraocular pressure were comparable in the two groups. Following insertion of the endotracheal tube with Macintosh laryngoscope, there was statistically significant rise in heart rate and intraocular pressure compared to Airtraq group. There was no significant change in MAP. Eight patients in Macintosh group had tongue-lip-dental trauma during intubation, while only 2 patients received upper airway trauma in Airtraq group. CONCLUSION: We conclude that Airtraq laryngoscope in comparison to Macintosh laryngoscope results in significantly fewer rises in intraocular pressure and clinically less marked increase in haemodynamic response to laryngoscopy and intubation.

Keywords

Airtraq, Haemodynamic response, Intraocular pressure, Macintosh blade

Resumo

JUSTIFICATIVA: Comparar as alterações de pressão intraocular após laringoscopia e intubação com lâmina Macintosh convencional e laringoscópio óptico Airtraq. MÉTODOS: Noventa pacientes adultos foram randomicamente designados para os grupos estudo ou controle. No grupo estudo (n = 45) o laringoscópio Airtraq foi usado para laringoscopia e no grupo controle (n = 45) o laringoscópio Macintosh convencional foi usado para laringoscopia. A pressão intraocular foi mensurada no pré-operatório com tonômetro Schiotz. A laringoscopia foi feita de acordo com o protocolo de cada grupo. Pressão intraocular e parâmetros hemodinâmicos foram registrados logo antes da inserção do dispositivo e três vezes após a inserção do dispositivo, com intervalo de um minuto. RESULTADOS: As características dos pacientes, os parâmetros hemodinâmicos basais e a PIO basal foram comparáveis nos dois grupos. Após a inserção do tubo endotraqueal com o laringoscópio Macintosh, houve um aumento estatisticamente significativo da frequência cardíaca e da pressão intraocular em comparação com o grupo Airtraq. Não houve alteração significativa da PAM. Oito pacientes do grupo Macintosh sofreram trauma de língua-lábio-dental durante a intubação, enquanto apenas dois pacientes sofreram trauma das vias aéreas superiores no grupo Airtraq. CONCLUSÃO: Concluímos que o laringoscópio Airtraq, em comparação com o laringoscópio Macintosh, resultou em elevações significativamente menores da PIO e em aumentos clinicamente menos acentuados da resposta hemodinâmica à laringoscopia e intubação.

Palavras-chave

Airtraq, Resposta hemodinâmica, Pressão intraocular, Lâmina Macintosh

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