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<p><a href="https://www.hondemedical.com/laryngeal-mask" rel="noopener noreferrer" target="_blank">Laryngeal mask</a> insertion method:</p><p>1. Anesthesia before insertion of laryngeal mask</p><p>(1) Intravenous induction of propofol: denitrogenation of the face mask, the laryngeal mask can be placed after induction of propofol intravenously, without the use of muscle relaxants. However, it must not be induced intravenously with thiopental sodium, because it is very easy to cause severe laryngospasm.</p><p>(2) Neuroleptic analgesia anesthesia: after removing sputum in the mask, intravenous injection of droperifen and fentanyl mixture combined with superficial anesthesia, the laryngeal mask can be placed.</p><p>(3) Inhalation general anesthesia: after inhaling O2-N2O (1: 2) and low concentration of isoflurane to induce the disappearance of throat reflex and the relaxation of mandible, the laryngeal mask can be placed, but it should be noted that the anesthesia should not be too shallow.</p><p><br></p><p>2. Placement of laryngeal mask</p><p>(1) Blind detection method: more commonly used, there are two methods: ① Conventional method: the head is slightly backed, the operator pulls the mandible in the left hand to widen the oral space, the right hand holds the laryngeal mask, the mouth of the mask faces the mandible, and sticks along the median line of the tongue The posterior wall is inserted downwards until it can no longer be advanced; ②Reversal method: The insertion method is basically the same as the conventional method, except that the mouth of the laryngeal mask is placed toward the hard palate to the entrance cavity to the bottom of the throat, and then rotated lightly 180 ゜After facing the throat), continue to push down the laryngeal mask until it can no longer be advanced.</p><p><br></p><p>(2) The best position for laryngeal mask placement: The best position is that the laryngeal mask enters the throat cavity, the lower end of the mask enters the upper esophageal mouth, the upper end of the mask closely adheres to the bottom of the epigastric surface, and the vent in the mask is directed against the glottis. After the cuff around the mask is inflated, a closed loop can be formed on the head of the larynx, thereby ensuring the ventilation effect. The average depth of a laryngeal mask placed in a child under 10 years old = 10cm + 0﹒3 × age (years)</p><p><br></p><p>(3) The method of identifying whether the position of the laryngeal mask is correct: there are two specific methods of identification: ① using a fiber optic laryngoscope to place the laryngeal mask for observation, the standard is: level 1 (only see epiglottis); level 2 (visible epiglottis harmonization) Door); Level 3 (visible epiglottis, that is, part of the mouth is covered by the epiglottis); Level 4 (invisible glottis, or epiglottis folded down). ②Positive pressure ventilation was performed after the laryngeal mask was placed, and the degree of thoracic undulation was observed. Whether the breath sounds on both sides of the auscultation were symmetrical and clear; whether there was leakage murmur in the anterior neck area.</p>
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