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Gaceta Médica Boliviana

Print version ISSN 1012-2966On-line version ISSN 2227-3662


SALGUERO ARISPE, Edwin Elias; TORREZ SALAZAR, Jandira Tania  and  TORREZ SALAZAR, Jeanneth. Predictable signs and its relationship with intubation. Gac Med Bol [online]. 2008, vol.31, n.1, pp.39-44. ISSN 1012-2966.

In order to determine the prognosis validity of predictable signs of intubation, we made a study including 90 patients, who were supposed to have programmed surgeries and emergency assistance. With general anaesthesia in H. O. # 2 CNS. Each patient took 4 tests before operation: Mallampati, Tyromenthonian Distance, Sternummenthonian and Atlan­tooccipital Joint Extension, after Cormack­Leane anaesthetics induction. With results, patients were classified according to possible easy or hard intubations in order to compare them. Those patients after each test would be easy to intube were really easy to do. Those who apparently were hard to intube, in fact they were really hard to do. From the 90 pa­tients, 77 (85.5%) were easy to intube, 10 (11.1%) showed little difficulty but they were not classified as hard intuba­tion. Three (3.3%) of them were hard to intube and there was any patient not being intubated through the conventional method. After carrying out the diagnostic discrimination test, it was set the sensitivity, specificity, positive predictable value and negative predictable value for each test. The Cormack­Lehane valuation was the most sensitive since it could detect all the patients that would have a hard intubation. Its specificity was also high, but as this test is done after inducing the patient, it is not useful to us. Measures of Sternummenthonian and Tyromentians Distances had the highest sensitivity and specificity after Cormack­Leane valuation. Furthermore, they are simple valuations to do before induc­tion. From our study they are very useful although they don’t detect all patients hard to intube or they give lot of false­positives answers. Precautions must be taken for those patients who show little measurement of these distances. Mallampati tests and the Atlantooccipital Joint Extension, showed to have very low sensitivity and specificity to be good predictable tests of intubation.

Keywords : predictable signs; intubation; correlation.

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