<?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>0212-1611</journal-id>
<journal-title><![CDATA[Nutrición Hospitalaria]]></journal-title>
<abbrev-journal-title><![CDATA[Nutr. Hosp.]]></abbrev-journal-title>
<issn>0212-1611</issn>
<publisher>
<publisher-name><![CDATA[Grupo Arán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-16112005000800002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio del gasto energético en la anorexia nerviosa: concordancia entre calorimetría indirecta y diferentes ecuaciones]]></article-title>
<article-title xml:lang="en"><![CDATA[Study of energy expenditure in anorexia nervosa: agreement between indirect calorimetry and several equations]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cuerda Compés]]></surname>
<given-names><![CDATA[M.ª C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz Sancho]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno Rengel]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iriondo Martínez]]></surname>
<given-names><![CDATA[M.ª T.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco Gimeno]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bretón Lesmes]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camblor Álvarez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Peris]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital General Universitario Gregorio Marañón Unidad de Nutrición ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital General Universitario Gregorio Marañón Unidad de Adolescentes de Psiquiatría ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<volume>20</volume>
<numero>6</numero>
<fpage>371</fpage>
<lpage>377</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112005000800002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112005000800002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112005000800002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El tratamiento nutricional es fundamental en la anorexia nerviosa (AN), si bien la reposición de nutrientes debe hacerse de forma progresiva para evitar la aparición del síndrome de realimentación. Objetivo: Comparar el gasto energético en reposo (GER) mediante calorimetría indirecta con el estimado con diferentes fórmulas en mujeres con AN. Material y Métodos: Estudiamos 21 mujeres ingresadas con AN (DSM-IV), edad 17 (DE 5,9) rango 12-34 años. El tiempo de ingreso fue 55,1 &plusmn; 20,7 días (21-91). La valoración nutricional inicial incluyó antropometría (IMC, PTC, PSE, CMB,CMMB) y bioimpedancia tetrapolar (HoltainBC). La calorimetría indirecta (CI) se realizó tras ayuno nocturno (Deltatrac TM II MBM-200). En 9 pacientes se repitió el mismo estudio antes del alta. Comparamos el GER (kcal/24 h) medido por CI con el obtenido por diferentes ecuaciones [Fleisch, Harris-Benedict (HB), FAO, Schofield-HW (SHW), Schebendach] mediante el coeficiente de correlación intraclase (CCI) y el método de Bland y Altman. Resultados: El estado nutricional mejoró significativamente durante la hopitalización. El 50% del peso recuperado fue masa grasa. El GER aumentó significativamente durante el ingreso. Las fórmulas sobrestimaron el GER respecto al obtenido por CI (p < 0,05), con excepción de la ecuación de Schebendach que infravaloró el GER. La concordancia entre la medida directa del GER por CI y su estimación por las fórmulas fue mala [Fleish (CCI = 0,21), HB (CCI = 0,21), FAO (CCI = 0,21), SHW (CCI = 0,19), Schebendach (CCI = 0,15)]. Mediante el método de Bland y Altman observamos que existía un sesgo variable entre la medida de la CI y las fórmulas, existiendo una concordancia clínicamente aceptable para valores de GER de aproximadamente 1.200 kcal/día. Conclusiones: 1) En nuestro estudio obtuvimos una baja concordancia entre los valores de GER medidos por calorimetría indirecta y los estimados por las fórmulas. 2) Mediante el método de Bland y Altman observamos que todas las fórmulas presentan un sesgo variable respecto a la CI, siendo la concordancia clínicamente aceptable para valores de GER alrededor de 1200 kcal/día. 3) Por tanto, la calorimetría indirecta parece una herramienta muy útil en el cálculo de los requerimientos energéticos de las pacientes con Anorexia Nerviosa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Nutritional management is essential in anorexia nervosa (AN), although nutrient replenishment must be done progressively to prevent the occurrence of re-alimentation syndrome. Objective: to compare resting energy expenditure (REE) by means of indirect calorimetry and by different equations in AN female patients. Material and methods: we studied 21 women admitted for AN (DSM-IV), mean age 17 years (SD 5.9), range 12-34 years. Admission stay was 55.1 &plusmn; 20.7 days (21-91). Initial nutritional assessment included anthropometrics (BMJ, TSF, SSE, MAC, MAMC) and tetrapolar bioimpedance (HoltainBC). Indirect calorimetry (IC) was done after overnight fasting (DeltatracTM II MBM-200). In 9 patients, the same study was repeated before hospital discharge. We compared REE (Kcal/24 h) measured by IC with that obtained by several equations [Fleish, Harris- Benedict, FAO, Schofield-HW (SHW), Schebendach] through the intraclass correlation coefficient (ICC) and the Bland-Altman method. Results: Nutritional status significantly improved during hospital admission. Fifty percent of the recovered weight was fat mass. REE significantly increased during admission. The equations overestimated REE as compared to IC (p < 0.05), except for the Schebendach equation that underestimated REE. The agreement between direct measurement of REE by IC and its estimation through equations was poor [Fleish (ICC = 0.21); HB (ICC = 0.21), SHW (ICC = 0.19), Schebendach (ICC = 0.15)]. Through the Bland-Altman method, we observed that there was a variable bias between IC and equations, with a clinically acceptable agreement for REW values of around 1200 Kcal/day. Conclusions: 1) In our study we obtained a poor agreement between REW values measured by indirect calorimetry and those estimated by equations. 2) Through the Bland-Altman method, we observed that all equations present a variable bias as for IC, the agreement being clinically acceptable for REE values of around 1200 Kcal/day. 3) Thus, indirect calorimetry seems to be a very useful tool to calculate the energy requirements of anorexia nervosa patients.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Gasto energético]]></kwd>
<kwd lng="es"><![CDATA[Anorexia nerviosa]]></kwd>
<kwd lng="en"><![CDATA[Energy expenditure]]></kwd>
<kwd lng="en"><![CDATA[Anorexia nervosa]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <b> <font size="4">Original</font></b>    <p> <b> <font size=5>Estudio del gasto energ&eacute;tico en la anorexia nerviosa: concordancia entre calorimetr&iacute;a indirecta y diferentes ecuaciones</font></b></p>     <p> <font>M.ª C. Cuerda Comp&eacute;s, A. Ruiz Sancho*, C. Moreno Rengel, M.ª T. Iriondo Mart&iacute;nez, C. Velasco Gimeno, I. Bret&oacute;n Lesmes,    <br> M. Camblor &Aacute;lvarez y P. Garc&iacute;a Peris</font></p>     <p><font size="2"> <i>Unidad de Nutrici&oacute;n y *Unidad de Adolescentes de Psiquiatr&iacute;a. Hospital General Universitario Gregorio Mara&ntilde;&oacute;n. Madrid. Espa&ntilde;a.</i></font></p>     <p>&nbsp;</p> <table border="0" width="100%">   <tr>     <td width="48%" valign="top"> <font><b>Resumen&nbsp;</b></font>    <p> <font><b>El tratamiento nutricional es fundamental en la anorexia nerviosa (AN), si bien la reposici&oacute;n de nutrientes debe hacerse de forma progresiva para evitar la aparici&oacute;n del s&iacute;ndrome de realimentaci&oacute;n.    <br>     <i>Objetivo:</i> Comparar el gasto energ&eacute;tico en reposo (GER) mediante calorimetr&iacute;a indirecta con el estimado con diferentes f&oacute;rmulas en mujeres con AN.    <br>     <i>Material y M&eacute;todos:</i>  Estudiamos 21 mujeres ingresadas con AN (DSM-IV), edad 17 (DE 5,9) rango 12-34 a&ntilde;os. El tiempo de ingreso fue 55,1 &plusmn; 20,7 d&iacute;as (21-91). La valoraci&oacute;n nutricional inicial incluy&oacute; antropometr&iacute;a (IMC, PTC, PSE, CMB,CMMB) y bioimpedancia tetrapolar (HoltainBC). La calorimetr&iacute;a indirecta (CI) se realiz&oacute;   tras ayuno nocturno (Deltatrac TM II MBM-200). En 9 pacientes se repiti&oacute; el mismo estudio antes del alta. Comparamos el GER (kcal/24 h) medido por CI con el obtenido por diferentes ecuaciones [Fleisch, Harris-Benedict (HB), FAO, Schofield-HW (SHW), Schebendach] mediante el coeficiente de correlaci&oacute;n intraclase (CCI) y el m&eacute;todo de Bland y Altman.    <br>     <i>Resultados:</i> El estado nutricional mejor&oacute; significativamente durante la hopitalizaci&oacute;n. El 50% del peso recuperado fue masa grasa. El GER aument&oacute; significativamente durante el ingreso. Las f&oacute;rmulas sobrestimaron el GER respecto al obtenido por CI (p &lt; 0,05), con excepci&oacute;n de la ecuaci&oacute;n de Schebendach que infravalor&oacute; el GER. La concordancia entre la medida directa del GER por CI y su estimaci&oacute;n por las f&oacute;rmulas fue mala [Fleish   (CCI = 0,21), HB (CCI = 0,21), FAO (CCI = 0,21), SHW (CCI = 0,19), Schebendach (CCI = 0,15)]. Mediante el m&eacute;todo de Bland y Altman observamos que exist&iacute;a un sesgo variable entre la medida de la CI y las f&oacute;rmulas, existiendo una concordancia cl&iacute;nicamente aceptable para valores de GER de aproximadamente 1.200 kcal/d&iacute;a.    ]]></body>
<body><![CDATA[<br>     <i>Conclusiones:</i>  1) En nuestro estudio obtuvimos una baja concordancia entre los valores de GER medidos por calorimetr&iacute;a indirecta y los estimados por las f&oacute;rmulas.   2) Mediante el m&eacute;todo de Bland y Altman observamos que todas las f&oacute;rmulas presentan un sesgo variable respecto a la CI, siendo la concordancia cl&iacute;nicamente aceptable para valores de GER alrededor de 1200 kcal/d&iacute;a.  3) Por tanto, la calorimetr&iacute;a indirecta parece una herramienta muy &uacute;til en el c&aacute;lculo de los requerimientos energ&eacute;ticos de las pacientes con Anorexia Nerviosa.</b></font></p>         <p align="right"> <font>(Nutr Hosp 2005, 20:371-377)</font></p>         <p> <font>Palabras clave:</font><i><font> Gasto energ&eacute;tico. Anorexia nerviosa.</font></i></td>     <td width="4%" valign="top">&nbsp;</td>     <td width="48%" valign="top">         <p align="center"><font><b>STUDY OF ENERGY EXPENDITURE IN ANOREXIA NERVOSA: AGREEMENT BETWEEN INDIRECT CALORIMATRY AND SEVERAL EQUATIONS</b></font></p>         <p> <font><b>Abstract</b></font></p>         <p> <font><b>Nutritional management is essential in anorexia nervosa (AN), although nutrient replenishment must be done progressively to prevent the occurrence of re-alimentation syndrome.    <br>     <i>Objective:</i>  to compare resting energy expenditure (REE) by means of indirect calorimetry and by different equations in AN female patients.    <br>     <i>Material and methods:</i> we studied 21 women admitted for AN (DSM-IV), mean age 17 years (SD 5.9), range 12-34 years. Admission stay was 55.1 &plusmn; 20.7 days (21-91). Initial nutritional assessment included anthropometrics (BMJ, TSF, SSE, MAC, MAMC) and tetrapolar bioimpedance (HoltainBC). Indirect calorimetry (IC) was done after overnight fasting (DeltatracTM II MBM-200). In 9 patients, the same study was repeated before hospital discharge. We compared REE (Kcal/24 h) measured by IC with that obtained by several equations [Fleish, Harris- Benedict, FAO, Schofield-HW (SHW), Schebendach] through the intraclass correlation coefficient (ICC) and the Bland-Altman method.    <br>     <i>Results: </i>Nutritional status significantly improved during hospital admission. Fifty percent of the recovered weight was fat mass. REE significantly increased during admission. The equations overestimated REE as compared to IC (p &lt; 0.05), except for the Schebendach equation that underestimated REE. The agreement between direct measurement of REE by IC and its estimation through equations was poor [Fleish (ICC = 0.21); HB (ICC = 0.21), SHW (ICC = 0.19), Schebendach (ICC = 0.15)]. Through the Bland-Altman method, we observed that there was a variable bias between IC and equations, with a clinically acceptable agreement for REW values of around 1200 Kcal/day.    <br>     <i>Conclusions:</i> 1) In our study we obtained a poor agreement between REW values measured by indirect calorimetry and those estimated by equations.  2) Through the Bland-Altman method, we observed that all equations present a variable bias as for IC, the agreement being clinically acceptable for REE values of around 1200 Kcal/day. 3) Thus, indirect calorimetry seems to be a very useful tool to calculate the energy requirements of anorexia nervosa patients.&nbsp;</b></font></p>         ]]></body>
<body><![CDATA[<p align="right"> <font>(Nutr Hosp 2005, 20:371-377)</font></p>         <p> <font>Key words:</font><i><font> Energy expenditure. Anorexia  </font> <font size="2">nervosa.</font></i></td>   </tr> </table> <hr align="left" width="48%">      <P align="left" ><b><font size="2">Correspondencia: </font> </b><font size="2">Correspondencia: Dra. M.ª Cristina Cuerda Comp&eacute;s    <br>    Unidad de Nutrici&oacute;n    <br>    HGU Gregorio Mara&ntilde;&oacute;n    <br>    Doctor Esquerdo, 46    <br>    28007 Madrid    <br>    E-mail: <a href="mailto:mcuerda.hgugm@salud.madrid.org">mcuerda.hgugm@salud. madrid.org</a></font></p>      <P align="left" >    <font size="2">    <font>Recibido:</font>   <font size="2">6-X-2004.</font>    <br>    <font size="2">Aceptado:</font>   <font size="2">20-X-2004.</font></font></p>      ]]></body>
<body><![CDATA[<P align="left" >    &nbsp;</p>      <P align="left" >    <font><b>Introducci&oacute;n</b></font></p>      <P align="left" >    <font>La anorexia nerviosa es una enfermedad mental que se incluye dentro de los trastornos del comportamiento alimentario. Seg&uacute;n los criterios del DSM-IV esta enfer-medad se caracteriza por miedo intenso a engordar, a pesar de que las pacientes presentan un peso inferior al 85% del peso ideal, distorsi&oacute;n de la imagen corporal, y amenorrea de m&aacute;s de 3 meses<sup>1</sup>.</font></p>      <P align="left" > <font>En el tratamiento de esta enfermedad resulta fundamental mejorar el estado nutricional de las pacientes ya que otros tratamientos como la psicoterapia y el tratamiento farmacol&oacute;gico (antidepresivos, antipsic&oacute;ticos, etc) son m&aacute;s efectivos cuando las pacientes han recuperado parte del peso perdido<sup> 2, 3</sup>.</font></p>      <P align="left" > <font>&nbsp;Dada la malnutrici&oacute;n de estas pacientes cuando ingresan en el hospital existe tambi&eacute;n el riesgo de desarrollar un s&iacute;ndrome de realimentaci&oacute;n que podr&iacute;a tener consecuencias desfavorables<sup>4, 5</sup>. Por todo ello resulta de gran inter&eacute;s conocer cu&aacute;les son los requerimientos energ&eacute;ticos de estas pacientes durante su ingreso y su evoluci&oacute;n durante el mismo.  </font></p>      <P align="left" > <font>Diferentes autores han se&ntilde;alado que aunque los requerimientos energ&eacute;ticos son bajos al ingreso, aumentan mucho durante la hospitalizaci&oacute;n debido a un incremento del gasto energ&eacute;tico en reposo y posprandial<sup>6-13</sup>.  </font></p>      <P align="left" > <font>Seg&uacute;n las recomendaciones de la Asociaci&oacute;n Americana de Psiquiatr&iacute;a el tratamiento nutricional deber&iacute;a aportar inicialmente 30-40 kcal/kg (1.000-1.500 kcal/d&iacute;a) e irse incrementando durante la hospitalizaci&oacute;n hasta 40-60 kcal/kg/d&iacute;a<sup>3</sup>.</font></p>      <P align="left" > <font>Los m&eacute;todos de elecci&oacute;n para la medida del gasto energ&eacute;tico son la calorimetr&iacute;a directa e indirecta y el agua con doble marcaje<sup>14-17</sup>. De ellos, la calorimetr&iacute;a indirecta es el m&eacute;todo m&aacute;s utilizado. La calorimetr&iacute;a indirecta mide el gasto energ&eacute;tico en reposo (GER) y se obtiene con el sujeto en dec&uacute;bito y en ayunas. No obstante esta t&eacute;cnica no est&aacute; disponible en la mayor&iacute;a de los hospitales ya que es cara, su medici&oacute;n lleva tiempo y requiere de un personal entrenado.  </font></p>      <P align="left" > <font>Por ello, en la pr&aacute;ctica cl&iacute;nica diaria se suelen utilizar diferentes f&oacute;rmulas, que aunque son sencillas para su manejo, tienen una validez cuestionable incluso entre la poblaci&oacute;n normal<sup>18, 19</sup>. Estas f&oacute;rmulas miden el    gasto energ&eacute;tico basal (GEB) que se define como el gasto energ&eacute;tico de una persona tras al menos 10 horas de ayuno, despierta, tumbada y con una temperatura    ambiente de termoneutralidad. Salvo en pacientes estresados (quemados, politraumas, cuidados intensivos), en la pr&aacute;ctica cl&iacute;nica los t&eacute;rminos GER y GEB se utilizan de forma intercambiable, dado que su variaci&oacute;n en poblaci&oacute;n no estresada es muy peque&ntilde;a<sup>20, 21</sup>. El GEB supone el 50-80% del gasto energ&eacute;tico total (GET), siendo sus otros componentes la termog&eacute;nesis inducida por los alimentos (10%) y el gasto por ejercicio f&iacute;sico (variable seg&uacute;n los enfermos). Conociendo el GEB podemos estimar el GET multiplicando por diferentes factores (seg&uacute;n la actividad f&iacute;sica y el estr&eacute;s del paciente)<sup>21-23</sup>.  </font></p>      <P align="left" > <font>El objetivo de nuestro estudio fue estudiar la evoluci&oacute;n    del GER durante la hospitalizaci&oacute;n en pacientes con AN mediante la utilizaci&oacute;n de la calorimetr&iacute;a indirecta, compar&aacute;ndola con la estimada mediante diferentes    ecuaciones.</font></p>      ]]></body>
<body><![CDATA[<P align="left" > <font>    <b>Pacientes y m&eacute;todos</b></font></p>      <P align="left" > <font>Realizamos un estudio prospectivo en 21 pacientes con anorexia nerviosa (criterios DSM-IV) hospitalizadas en nuestro hospital. Todas eran mujeres, con edad media de 17 &plusmn; 5,9 a&ntilde;os (12-34 a&ntilde;os). El tiempo medio de ingreso fue 55,1 &plusmn; 20,7 d&iacute;as (21-91).  </font></p>      <P align="left" > <font>En todas las pacientes se realiz&oacute; una valoraci&oacute;n nutricional inicial que inclu&iacute;a medidas antropom&eacute;tricas como el &iacute;ndice de masa corporal (IMC), pliegue tricipital (PTC), pliegue subescapular (PSE), circunferencia media del brazo (CMB) y circunferencia media muscular del brazo (CMMB).</font></p>      <P align="left" > <font>Para la medici&oacute;n del peso y talla se utiliz&oacute; una b&aacute;scula (Seca&reg;) con tall&iacute;metro con una precisi&oacute;n de 0,2 kg y 0,1 cm respectivamente. El IMC se calcul&oacute; dividiendo el peso (kg) de las pacientes por el cuadrado de la talla (m<sup>2</sup>).</font></p>      <P align="left" > <font>La medida de los pliegues (PTC, PSE) se realiz&oacute; por triplicado con el lipocaliper Holtain (presi&oacute;n 10g/mm<sup>2</sup>, precisi&oacute;n 0,2 mm). La CMB se obtuvo por triplicado mediante cinta m&eacute;trica con una precisi&oacute;n de 0,1 cm. La medida de los pliegues y circunferencias se realiz&oacute; de acuerdo con los Est&aacute;ndares Internacionales<sup>24</sup>. La CMB se calcul&oacute; mediante la f&oacute;rmula CMMB = CMB-   <font face="Times New Roman">&#960;</font> PTC<sup>24</sup>. Para el estudio de la composici&oacute;n corporal se realiz&oacute; bioimpedancia tetrapolar monofrecuencia (Holtain<sub> BC</sub>) determinando el porcentaje de masa grasa y de masa magra a trav&eacute;s de la determinaci&oacute;n del agua corporal total, mediante el software sumunistrado por el fabricante.</font></p>      <P align="left" > <font>Asimismo realizamos calorimetr&iacute;a indirecta (CI) mediante un calor&iacute;metro de circuito abierto (Deltatrac<sup>TM</sup> II MBM-200). El gasto energ&eacute;tico en reposo (GER) era medido durante 30 minutos con las pacientes en reposo en dec&uacute;bito supino tras ayuno nocturno, a trav&eacute;s del V0<sub>2</sub> y VCO<sub>2</sub> mediante la ecuaci&oacute;n de Weir.  </font></p>      <P align="left" > <font>En 9 pacientes se repiti&oacute; el mismo estudio (antropometr&iacute;a, composici&oacute;n corporal y calorimetr&iacute;a) antes del alta.  </font></p>      <P align="left" > <font>El estudio estad&iacute;stico se realiz&oacute; con pruebas no param&eacute;tricas (Test de Wilcoxon) para comparar las variables estudiadas en los pacientes al inicio y al final de la hospitalizaci&oacute;n, as&iacute; como para comparar el GER con CI con el obtenido por las diferentes f&oacute;rmulas. Estudiamos la concordancia entre los valores de GER medidos por CI y los obtenidos por distintas f&oacute;rmulas<sup>25- 29</sup>   (Fleisch, Harris-Benedict (HB), FAO, Schofield- HW (SHW), Schebendach) mediante el coeficiente de correlaci&oacute;n intraclase (CCI)<sup>30</sup> y el m&eacute;todo de Bland y Altman<sup>31</sup>. Las f&oacute;rmulas utilizadas se muestran en la   <a href="#t1">tabla I</a>.</font></p>      <P align="center" > <font size="2">  <a name="t1">  <img src="/img/revistas/nh/v20n6/orig2_t1.gif" width="362" height="322"></a> </font></p>      <P align="left" ><font><b>    ]]></body>
<body><![CDATA[<br>  Resultados</b></font></p>      <P align="left" ><font>El estado nutricional mejor&oacute; significativamente durante la hospitalizaci&oacute;n (<a href="#t2">tabla II</a>). El IMC pas&oacute; de 15,5 &plusmn; 2,1 Kg/m<sup>2</sup> al ingreso, a 17,8 &plusmn; 1,2 al alta (p &lt;0,01).</font><font size="2">&nbsp;</font></p>      <P align="center" ><font size="2">  <a name="t2">  <img src="/img/revistas/nh/v20n6/orig2_t2.gif" width="365" height="540"></a></font></p>      <P align="left" ><font>    <br>  El peso recuperado por las enfermas se reparti&oacute; en partes iguales (50%) entre masa magra y masa grasa. El GER aument&oacute; significativamente durante el ingreso   tanto el medido por CI como el calculado por las f&oacute;rmulas (<a href="#t3">tabla III</a>) (<a target="_blank" href="/img/revistas/nh/v20n6/orig2_f1.gif">fig. 1</a>).   El cociente respiratorio (CR) fue normal en todos los casos y no se modificó de   forma significativa durante el estudio (0,96 ± 0,97 al inicio versus 0,95 ±   0,99 al final).</font></p>      <P align="center" >  <a name="t3">  <img src="/img/revistas/nh/v20n6/orig2_t3.gif" width="364" height="437"></a></p>      <P align="left" ><font>    <br>  Todas las f&oacute;rmulas sobrestimaron el GER respecto al obtenido por CI (p&lt; 0,05), con excepci&oacute;n de la de Schebendach que infravalor&oacute; el GER (<a target="_blank" href="/img/revistas/nh/v20n6/orig2_f2.gif">fig. 2</a>).    </font></p>      <P align="left" ><font>La diferencia en valores absolutos entre el GER estimado por las f&oacute;rmulas y el medido por CI fue &gt; 10%   en el 62%, 57%, 76%, 61% y 81% de las pacientes, cuando se emplearon las ecuaciones de Fleisch, HB, FAO, SHW y Schebendach respectivamente.</font></p>      <P align="left" ><font>La concordancia entre la medida directa del GER por CI y la estimada por las f&oacute;rmulas fue mala como queda reflejada por los pobres coeficientes de correlaci&oacute;n intraclase   (Fleish (CCI = 0,21), HB (CCI = 0,21), FAO (CCI = 0,21), SHW (CCI = 0,19), Schebendach (CCI = 0,15)). Mediante el m&eacute;todo de Bland y Altman observamos que exist&iacute;a un sesgo variable entre la medida de la CI y las f&oacute;rmulas, existiendo una concordancia cl&iacute;nicamente aceptable para valores de GER de aproximadamente 1.200 kcal/d&iacute;a (<a target="_blank" href="/img/revistas/nh/v20n6/orig2_f3.gif">figs. 3-6</a>)   (<a href="#f7">fig. 7</a>).</font></p>      ]]></body>
<body><![CDATA[<P align="center" ><font size="2"><a name="f7"><img src="/img/revistas/nh/v20n6/orig2_f7.gif" width="344" height="286"></a>   </font></p>      <P align="left" ><font>   <b>    <br>   Discusi&oacute;n</b></font></p>      <P align="left" ><font>Los pacientes con anorexia nerviosa suelen presentar malnutrici&oacute;n y p&eacute;rdida de peso con depleci&oacute;n de masa grasa y magra como consecuencia de su enfermedad<sup>32</sup>.   La recuperaci&oacute;n de peso se produce a expensas de grasa y masa magra en porcentajes variables, dependiendo del grado de malnutrici&oacute;n, de la ganancia de peso y de la velocidad de recuperaci&oacute;n, del tipo y composici&oacute;n de la dieta utilizada, entre otras causas<sup>33</sup>.    </font></p>      <P align="left" ><font>En nuestra serie las pacientes recuperaron s&oacute;lo un 50% del peso en forma de grasa, porcentaje similar a la serie de Krahn<sup>6</sup> (48%), Pichard<sup>10</sup> (54%), Probst<sup>34</sup> (55,5%) e inferior a lo encontrado en las series de Vaisman<sup>35</sup> (65%), Grinspoon<sup>36</sup> (68%) y Orphanidou<sup>37</sup> (78%). Probablemente por ello en nuestro estudio, el CR no se modific&oacute; significativamente durante el ingreso. El CR fue inferior a 1,1 en todos los casos durante la realimentaci&oacute;n, lo que indica que no existi&oacute; una lipog&eacute;nesis excesiva<sup>38</sup>.    </font></p>      <P align="left" ><font>Como consecuencia de la adaptaci&oacute;n al ayuno se ha se&ntilde;alado que estas pacientes presentan un estado hipometab&oacute;lico<sup>9</sup>. En nuestro estudio pudimos comprobar que el GER medido mediante CI al ingreso era inferior al estimado por las f&oacute;rmulas utilizadas (Fleisch, HB, FAO, SHW), sin grandes diferencias entre ellas. Esto coincide con los resultados de otros autores<sup>6, 39, 40</sup>. Por ello, el grupo de Schebendach desarroll&oacute; una nueva ecuaci&oacute;n para pacientes con AN, mediante an&aacute;lisis de regresi&oacute;n a partir de la ecuaci&oacute;n de HB<sup>29</sup>. En nuestro estudio, esta f&oacute;rmula fue la &uacute;nica que infravalor&oacute; el GER. La ecuaci&oacute;n de Schebendach parece predecir mejor el GER en adolescentes que en adultos con AN<sup>40, 41</sup>. Sin embargo, en nuestro estudio la mayor&iacute;a de pacientes fueron adolescentes y la concordancia fue igualmente mala.    </font></p>      <P align="left" ><font>El hecho de que la mayor&iacute;a de las f&oacute;rmulas habitualmente utilizadas sobrestimen el GER en este tipo de pacientes tiene consecuencias cl&iacute;nicas muy relevantes pues se trata de enfermas que pueden desarrollar un s&iacute;ndrome de realimentaci&oacute;n, cuyas consecuencias pueden ser a veces muy graves<sup>4, 5</sup>. Ninguna de nuestras enfermas desarroll&oacute; s&iacute;ndrome de realimentaci&oacute;n   probablemente debido a que la realimentación se realizó de forma lenta y   progresiva.</font></p>      <P align="left" ><font>Observamos un incremento del GER durante la hospitalizaci&oacute;n, tanto mediante la CI como por las f&oacute;rmulas, aunque el GER medido permaneci&oacute; siempre por debajo del estimado (~ 10% menor del estimado) por las ecuaciones salvo en la f&oacute;rmula de Schebendach (~ 21% superior al estimado).</font></p>      <P align="left" ><font>El incremento del GER durante la hospitalizaci&oacute;n fue s&oacute;lo del 5% en nuestro estudio, mientras que otros estudios fue del 11%9 y hasta &gt; 50%39. Por eso en algunos estudios las f&oacute;rmulas infravaloran el gasto durante la realimentaci&oacute;n (39,6).</font></p>      <P align="left" ><font>&nbsp;El hecho de que en &gt; 50% de las pacientes la diferencia entre el GER medido por CI y el estimado por las f&oacute;rmulas fue &gt; 10% indica que estas f&oacute;rmulas no son adecuadas para el c&aacute;lculo de los requerimientos de   estas pacientes. La mayor&iacute;a de ellas fueron dise&ntilde;adas para poblaci&oacute;n normal con unas caracter&iacute;sticas de composici&oacute;n corporal que distan mucho de las de este   grupo de enfermas<sup>18</sup>. Hay que destacar que las f&oacute;rmulas empleadas en este estudio son las que se utilizan habitualmente en este grupo de edad<sup>42</sup>.    </font></p>      ]]></body>
<body><![CDATA[<P align="left" ><font>Mediante el estudio del CCI obtuvimos una mala concordancia entre los valores medidos con la CI y los estimados con las f&oacute;rmulas y con el m&eacute;todo de Bland y Altman observamos que con todas las f&oacute;rmulas se produc&iacute;a un sesgo variable, de forma que para valores bajos de GER la f&oacute;rmula sobrestimaba el GER, para valores intermedios (~ 1.200 kcal/d&iacute;a) la f&oacute;rmula predec&iacute;a bien el GER y para valores altos de GER la f&oacute;rmula infravaloraba el GER.    </font></p>      <P align="left" ><font>Como conclusi&oacute;n podemos decir que en general todas las f&oacute;rmulas sobrestiman el GER respecto a la CI, con excepci&oacute;n de la ecuaci&oacute;n de Schebendach que en nuestro estudio la infravalora. Adem&aacute;s, a tenor de los resultados obtenidos mediante el CCI y el m&eacute;todo de Bland y Altman, parece que las ecuaciones podr&iacute;an predecir de forma aceptable el GER para valores intermedios de GER, pero no para valores extremos, siendo adem&aacute;s ese sesgo variable. Por todo ello, pensamos que en este tipo de paciente es muy importante el poder disponer de CI para medir el GER.   </font></p>      <P align="left" >  <font><b>Referencias</b></font></p>      <!-- ref --><P align="left" >   <font> 1. American Psychiatric Association: Diagnostic and statistical manual of mental disorders, 4th ed (DSM-IV). 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