Dr Asif Saleem, Dr Muhammad Mashhood Ahmad Shad, Dr Hafiz Muhammad Faraz Hassan
Background: . Depending on upper airway patency during anesthesia induction, tidal volume achieved by mask ventilation may vary. In 80 adult patients undergoing general anesthesia, the authors tested a hypothesis that tidal volume during mask ventilation is smaller in patients with sleep-disordered breathing priorly defined as apnea hypopnea index greater than 5 per hour. This study was conducted to determine the efficacy of ventilation using face mask induction of general anesthesia Study Design: Cross-sectional study. Place and Duration of Study: This study was conducted at the Lahore General Hospital, Lahore for the duration of six months from January 2020 to June 2020. Materials and Methods: Eighty patients were enrolled. Average age of patients was 25 to 60 years, with a BMI lower than 30. Subsequently, the patients were arranged to divide into two groups Group A and Group B. In the group A, ventilation was performed using the standard mask ventilation with 100% oxygen for 4 minutes. And in other group B, ventilation was undertaken through an anatomical nasal mask. The mean expiratory volume, mean SpO2, mean end tidal CO2 (Et CO2) and mean airway pressure were measured, recorded and compared in both groups. Once placed on the operating table, 100% oxygen were provided to the patients using a face mask for 4 minutes, after which medication (anesthesia) were arranged. Results: The ventilation parameters, maximum airway pressure after starting of mask ventilation in the face mask group is higher than the nasal mask group (15.1±1.8 and 11.8±1.4during the 3rd minute respectively, p< 0.001) and the face mask group (94.5±2.1 and 96.1±4) is lower than the SpO2 at this time respectively (p< 0.001). There is no any significant difference related to other parameters. Conclusion: The ventilation with a face mask is less effective than the nasal mask which is more efficient with a BMI less than 30 and is observed by a minimum amount of complications and risk. Key Words: Mask, Ventilation, Induction, Anesthesia.