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of the group with SOTP-BANG score &#62;3 were confirmed to have OSA &#40;43&#46;3&#37; from the total of 746&#41;&#46; If we accept that both of these surgical populations&#44; from the study of Pereira et al&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> and the study of Chung et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> are similar&#44; we can infer that the prevalence of undiagnosed OSA in patients with STOP-BANG<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>3 in the Pereira et al&#46; study is 39&#37; &#40;177<span class="elsevierStyleHsp" style=""></span>&#42;<span class="elsevierStyleHsp" style=""></span>0&#46;75&#47;340&#41;&#44; somewhat lower than the reported estimated prevalence of 52&#37;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">It is interesting to note that the authors also conclude that these patients with High Risk OSA &#40;HR-OSA&#41; have a higher incidence of postoperative respiratory complications and that mild&#47;moderate hypoxia was the most frequent adverse respiratory event &#40;ARE&#41; to occur in these patients&#46; If we analyze the reported ARE it seems that&#44; HR-OSA patients were not associated with overall statistically significant higher number of ARE &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;140&#41;&#46; Also&#44; out of the 6 defined types of ARE&#44; only the previously mentioned mild&#47;moderate hypoxia &#40;the definition of which is included in the methods section&#41; was statistically more frequent in this HR-OSA group&#46; It is also noteworthy that the HR-OSA population had a statistically significant greater ASA score&#44; more frequent neuromuscular residual blocking&#44; high-risk surgery and major surgery and&#44; as we can see in Table 3 of the article&#44; out of the 8 analyzed &#8220;predictors of adverse respiratory events&#8221; only HR-OSA was not a statistically significant predictor&#44; contrary to others&#44; such as&#58; gender&#44; intra-abdominal surgery&#44; high risk surgery&#44; major surgery&#44; use of neuromuscular blocking drugs and residual neuromuscular blockade &#40;and the latter was the only independent risk factor for ARE&#41;&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">In conclusion&#44; this study exposes a high percentage of patients with probable undiagnosed OSA that would probably benefit from a polysomnography analysis&#46; However&#44; we feel this study has failed to show that surgical patients with a high risk of OSA&#44; as determined by STOP-BANG score<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>3&#44; are associated with higher incidence of ARE in the postoperative period or&#44; that HR-OSA is a predictor of these ARE&#46; However&#44; previous papers have shown that OSA itself is associated with a statistically significant higher incidence of respiratory complications&#44;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> increased intensive care unit admissions&#44;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> and greater duration of hospital stay&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a></p></span>"
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Letter to the Editor
Obstructive sleep apnea prevalence and adverse respiratory events in surgical patients
Prevalência de apneia obstrutiva do sono e eventos respiratórios adversos em pacientes submetidos a cirurgia
R. Reis
Corresponding author
ricardomcreis@gmail.com

Corresponding author.
Pneumonology, Centro Hospitalar de Trás-os-Montes e Alto Douro, Vila Real, Portugal
A. Antunes
Centro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">In the article &#8220;Patients with a high risk for obstructive sleep apnea syndrome&#58; Postoperative respiratory complications&#8221; by Pereira et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> the authors aim to evaluate the incidence of STOP-BANG score<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>3&#44; in surgical patients admitted to the Post-Anesthesia Care Unit&#46; It is rather alarming that the reported prevalence of patients with characteristics suggestive of obstructive sleep apnea &#40;OSA&#41; as evaluated by the STOP-BANG questionnaire was 52&#37; &#40;177 from 340&#41;&#46; This number suggests that the majority of patients in the surgical population have undiagnosed OSA&#59; however&#44; it is unfortunate that in this study there was no polysomnography analysis of the patients and so&#44; there was no confirmation of this estimated prevalence&#46; If&#44; however&#44; we report to the study done by Chung et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> author of the STOP and STOP-BANG questionnaires&#44;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> which was also with a surgical population&#44; we see that the reported percentage of patients with STOP-BANG<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>3 is of 57&#46;5&#37; &#40;429 from 746&#41;&#44; which is close to the number from the study by Pereira et al&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> However&#44; in the study by Chung et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> these patients were analyzed with polysomnography and 75&#46;3&#37; of the group with SOTP-BANG score &#62;3 were confirmed to have OSA &#40;43&#46;3&#37; from the total of 746&#41;&#46; If we accept that both of these surgical populations&#44; from the study of Pereira et al&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> and the study of Chung et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> are similar&#44; we can infer that the prevalence of undiagnosed OSA in patients with STOP-BANG<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>3 in the Pereira et al&#46; study is 39&#37; &#40;177<span class="elsevierStyleHsp" style=""></span>&#42;<span class="elsevierStyleHsp" style=""></span>0&#46;75&#47;340&#41;&#44; somewhat lower than the reported estimated prevalence of 52&#37;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">It is interesting to note that the authors also conclude that these patients with High Risk OSA &#40;HR-OSA&#41; have a higher incidence of postoperative respiratory complications and that mild&#47;moderate hypoxia was the most frequent adverse respiratory event &#40;ARE&#41; to occur in these patients&#46; If we analyze the reported ARE it seems that&#44; HR-OSA patients were not associated with overall statistically significant higher number of ARE &#40;<span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;140&#41;&#46; Also&#44; out of the 6 defined types of ARE&#44; only the previously mentioned mild&#47;moderate hypoxia &#40;the definition of which is included in the methods section&#41; was statistically more frequent in this HR-OSA group&#46; It is also noteworthy that the HR-OSA population had a statistically significant greater ASA score&#44; more frequent neuromuscular residual blocking&#44; high-risk surgery and major surgery and&#44; as we can see in Table 3 of the article&#44; out of the 8 analyzed &#8220;predictors of adverse respiratory events&#8221; only HR-OSA was not a statistically significant predictor&#44; contrary to others&#44; such as&#58; gender&#44; intra-abdominal surgery&#44; high risk surgery&#44; major surgery&#44; use of neuromuscular blocking drugs and residual neuromuscular blockade &#40;and the latter was the only independent risk factor for ARE&#41;&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">In conclusion&#44; this study exposes a high percentage of patients with probable undiagnosed OSA that would probably benefit from a polysomnography analysis&#46; However&#44; we feel this study has failed to show that surgical patients with a high risk of OSA&#44; as determined by STOP-BANG score<span class="elsevierStyleHsp" style=""></span>&#8805;<span class="elsevierStyleHsp" style=""></span>3&#44; are associated with higher incidence of ARE in the postoperative period or&#44; that HR-OSA is a predictor of these ARE&#46; However&#44; previous papers have shown that OSA itself is associated with a statistically significant higher incidence of respiratory complications&#44;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> increased intensive care unit admissions&#44;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> and greater duration of hospital stay&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a></p></span>"
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Article information
ISSN: 21735115
Original language: English
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