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  • METHODS
  • RESULTS
  • DISCUSSION
  • REFERENCES
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The purpose of this study was to compare the effectiveness of various concentrations of N2O/O2 on obtunding a hypersensitive gag reflex. We hypothesized that the administration of nitrous oxide and oxygen would obtund a hypersensitive gag reflex enough to allow a patient to tolerate the placement and holding of a digital x-ray sensor long enough to obtain a dental radiograph. Volunteers claiming to have a hypersensitive gag reflex were first screened to validate their claim and then tested by placing a size 2 digital x-ray sensor in the position for a periapical radiograph of the right mandibular molar area and holding it in place for 10 seconds. Subjects were first tested using room air only, then 30%, 50%, or 70% nitrous oxide until they were able to tolerate the sensor without gagging or discomfort. A visual analog scale was used for subjective responses, and other statistical tests were used to analyze the results. We found that for some subjects, 30% nitrous oxide was sufficient; for others, 50% was needed; and for the remainder of the subjects, 70% was sufficient to tolerate the test. Using a combination of 70% nitrous oxide and 30% oxygen allowed all patients claiming to have a hypersensitive gag reflex to tolerate the placement and holding of a digital x-ray sensor long enough to take a periapical radiograph.

Keywords: Gag reflex; Hypersensitive gag reflex; Dental radiographs; Nitrous oxide and oxygen
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Copyright: © 2016 by the American Dental Society of Anesthesiology
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Article Contents

Perioperative Management of a Patient With Idiopathic Pulmonary Hypertension and a History of Syncope: A Case Report

Aiji Sato (Boku) DDS, PhD;,
 MinHye So MD, PhD;,
 Kazuma Fujikake MD, PhD;,
 Motoshi Tanaka MD;,
 Yuji Kamimura MD, PhD;,
 Haruko Ota MD, PhD;,
 Tomomi Mizutani DDS,
 Kenichiro Ishibashi DDS, PhD;,
 Yasuyuki Shibuya DDS, PhD;, and
 Kazuya Sobue MD, PhD

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 Hidetaka Kuroda DDS, PhD,
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 Naotaka Kishimoto DDS, PhD

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 Aiji Sato (Boku) DDS, PhD,
 Mayuko Kanazawa DDS, PhD,
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 Yuko Shikama DDS,
 Hiroko Kobayashi DDS,
 Makoto Hirohata DDS,
 Naoko Tachi DDS, PhD, and
 Masahiro Okuda MD, PhD
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