<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-3347</journal-id>
<journal-title><![CDATA[Colombian Journal of Anestesiology]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. colomb. anestesiol.]]></abbrev-journal-title>
<issn>0120-3347</issn>
<publisher>
<publisher-name><![CDATA[SCARE-Sociedad Colombiana de Anestesiología y Reanimación]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-33472023000300040</article-id>
<article-id pub-id-type="doi">10.5554/22562087.e1064</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Difference in ketone bodies levels between diurnal and nocturnal fasting in children: observational study]]></article-title>
<article-title xml:lang="es"><![CDATA[Diferencia en los niveles de cuerpos cetónicos entre el ayuno diurno y nocturno en niños: estudio observacional]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trujillo]]></surname>
<given-names><![CDATA[Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arango]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Caldas Health Sciences School Surgery Department]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Manizales Health Sciences School ]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Caldas  ]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2023</year>
</pub-date>
<volume>51</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-33472023000300040&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-33472023000300040&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-33472023000300040&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction Children are susceptible to developing preoperative ketonemia, which can be affected by changes in the circadian rhythm and counter-regulatory hormones. It is unclear whether ketonemia depends on the timing of fasting.  Objective To assess the effect of preoperative fasting time (diurnal vs. night) on the preoperative concentration of ketone bodies in children.  Methods We conducted a prospective-observational clinical study between September 2020 and March 2021, including children under 48 months of age scheduled for elective surgery. Two groups were identified based on fasting time, as follows: diurnal fasting (group A, n = 40) and nocturnal fasting (group B, n = 52). Demographic data, duration of fasting, time of excess fasting, type of food intake, the concentration of ketone bodies and capillary blood glucose, level of anxiety, and dehydration were analyzed in both groups.  Results Diurnal fasting was associated with higher incidence of ketonemia compared with nocturnal fasting (Group A: 62.5% (95% CI 48.1-82.0); group B: 38,5% (95% CI 26.5-52.5), P=0.02). Most of the patients exceeded the duration of fasting recommended by preoperative fasting guidelines (95.6%). The type of food eaten before surgery was significantly associated with the presence of ketonemia (P=0.01).  Conclusions Preoperative ketonemia is relatively common in patients under 48 months of age, especially among those who undergo diurnal fasting compared to nocturnal fasting.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción Los niños son susceptibles a desarrollar cetonemia preoperatoria que puede verse afectada por cambios en el ritmo circadiano y las hormonas contrarreguladoras. No está claro si la cetonemia depende de la hora del ayuno.  Objetivo Evaluar el efecto del momento del ayuno preoperatorio (diurno vs. nocturno) sobre la concentración preoperatoria de los cuerpos cetónicos en niños.  Métodos Llevamos a cabo un estudio clínico observacional entre septiembre de 2020 y marzo de 2021, en niños menores de 48 meses, programados para cirugía electiva. Se identificaron dos grupos basados en la hora del ayuno, como sigue: ayuno diurno (grupo A, n = 40) y ayuno nocturno (grupo B, n = 52). En ambos grupos se analizaron los datos demográficos, la duración del ayuno, el tiempo excesivo de ayuno, el tipo de ingesta de alimentos, la concentración de cuerpos cetónicos, la glicemia capilar, el nivel de ansiedad y la deshidratación.  Resultados El ayuno diurno se asocio con una mayor incidencia de cenotemia en comparación con el ayuno nocturno (Grupo A: 62,5% (IC 95% 48,1-82,0); grupo B: 38,5% (95% CI 26.5-52.5), P=0.02). La mayoría de los pacientes excedieron el tiempo de ayuno recomendado según las guías de ayuno preoperatorio (95,6%). El tipo de alimentos ingeridos antes de la cirugía se asoció de manera importante con la presencia de cetonemia (P=0,01).  Conclusiones La cetonemia preoperatoria es relativamente común en pacientes menores de 48 meses de edad, especialmente entre quienes se someten a ayuno diurno en comparación con ayuno nocturno.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Children]]></kwd>
<kwd lng="en"><![CDATA[Anesthesia]]></kwd>
<kwd lng="en"><![CDATA[Ketonemia]]></kwd>
<kwd lng="en"><![CDATA[Fasting]]></kwd>
<kwd lng="en"><![CDATA[Circadian clock]]></kwd>
<kwd lng="en"><![CDATA[Anesthesiology]]></kwd>
<kwd lng="es"><![CDATA[Niños]]></kwd>
<kwd lng="es"><![CDATA[Anestesia]]></kwd>
<kwd lng="es"><![CDATA[Cetonemia]]></kwd>
<kwd lng="es"><![CDATA[Ayuno]]></kwd>
<kwd lng="es"><![CDATA[Reloj circadiano]]></kwd>
<kwd lng="es"><![CDATA[Anestesiología]]></kwd>
</kwd-group>
</article-meta>
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