COMPARISON OF HEMODYNAMIC RESPONSE TO TRACHEAL INTUBATION WITH MACINTOSH AND MCCOY LARYNGOSCOPES

BACKGROUND: McCoy laryngoscope incorporates a modification of the Macintosh laryngoscope. It was designed to facilitate difficult intubation. Use of this blade reduces the lifting force required during laryngoscopy. MATERIAL AND METHODS: The present prospective randomized study was conducted to evaluate the effectiveness of McCoy laryngoscope in attenuating the pressor response secondary to tracheal intubation as compared to Macintosh laryngoscope in terms of magnitude and duration in 80 patients of ASA Grade I and II. The changes in heart rate, systolic, diastolic, mean arterial pressure and rate pressure product were observed for 10 minutes post intubation. Time taken for laryngoscopy and intubation was also noted. RESULTS: Following laryngoscopy and intubation, it was observed that there was statistically significant rise in heart rate, systolic blood pressure, diastolic blood pressure, mean arterial pressure and rate pressure product in both the groups. The increase in hemodynamic variables was statistically significant with Macintosh laryngoscope as compared to McCoy laryngoscope and lasted for lesser duration in McCoy group. CONCLUSION: McCoy laryngoscope produces significantly less marked hemodynamic response as compared to Macintosh laryngoscope.