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	<front>
		<journal-meta>
			<journal-id journal-id-type="publisher-id">ijeph</journal-id>
			<journal-title-group>
				<journal-title>Interdisciplinary Journal of Epidemiology and Public Health</journal-title>
				<abbrev-journal-title abbrev-type="publisher">Interdiscipl. J. Epidemiol. Public Health</abbrev-journal-title>
			</journal-title-group>
			<issn pub-type="ppub">2665-427X</issn>
			<publisher>
				<publisher-name>Facultad Ciencias de la Salud, Universidad Libre</publisher-name>
			</publisher>
		</journal-meta>
		<article-meta>
			<article-id pub-id-type="doi">10.18041/2665-427X/ijeph.1.10228</article-id>
			<article-categories>
				<subj-group subj-group-type="heading">
					<subject>Articulo de revisión</subject>
				</subj-group>
			</article-categories>
			<title-group>
				<article-title>Déficit de hormona de crecimiento en el adulto</article-title>
				<trans-title-group xml:lang="en">
					<trans-title>Adult growth hormone deficit</trans-title>
				</trans-title-group>
			</title-group>
			<contrib-group>
				<contrib contrib-type="author">
					<contrib-id contrib-id-type="orcid">0000-0003-4081-2559</contrib-id>
					<name>
						<surname>Pantoja Rosero</surname>
						<given-names>María Elena</given-names>
					</name>
					<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
				</contrib>
				<contrib contrib-type="author">
					<contrib-id contrib-id-type="orcid">0000-0002-3842-1607</contrib-id>
					<name>
						<surname>Mejía</surname>
						<given-names>Andrés Felipe</given-names>
					</name>
					<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
				</contrib>
				<contrib contrib-type="author">
					<contrib-id contrib-id-type="orcid">0000-0002-7377-4969</contrib-id>
					<name>
						<surname>Abreu Lomba</surname>
						<given-names>Alín</given-names>
					</name>
					<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
				</contrib>
			</contrib-group>
			<aff id="aff1">
				<label>1</label>
				<institution content-type="original"> Hospital Civil de Ipiales E.S.E., Ipiales, Colombia</institution>
				<institution content-type="orgname">Hospital Civil de Ipiales E.S.E.</institution>
				<addr-line>
					<city>Ipiales</city>
				</addr-line>
				<country country="CO">Colombia</country>
			</aff>
			<aff id="aff2">
				<label>2</label>
				<institution content-type="original"> Clínica de Occidente, Cali, Colombia</institution>
				<institution content-type="orgname">Clínica de Occidente</institution>
				<addr-line>
					<city>Cali</city>
				</addr-line>
				<country country="CO">Colombia</country>
			</aff>
			<aff id="aff3">
				<label>3</label>
				<institution content-type="original"> Clinica Imbanaco, Cali, Colombia</institution>
				<institution content-type="orgname">Clinica Imbanaco</institution>
				<addr-line>
					<city>Cali</city>
				</addr-line>
				<country country="CO">Colombia</country>
			</aff>
			<pub-date date-type="pub" publication-format="electronic">
				<day>30</day>
				<month>06</month>
				<year>2023</year>
			</pub-date>
			<pub-date date-type="collection" publication-format="electronic">
				<season>Jan-Jun</season>
				<year>2023</year>
			</pub-date>
			<volume>6</volume>
			<issue>1</issue>
			<elocation-id>e-10228</elocation-id>
			<history>
				<date date-type="received">
					<day>17</day>
					<month>12</month>
					<year>2022</year>
				</date>
				<date date-type="accepted">
					<day>06</day>
					<month>06</month>
					<year>2023</year>
				</date>
			</history>
			<permissions>
				<license license-type="open-access" xlink:href="https://creativecommons.org/licenses/by-nc-nd/4.0/" xml:lang="es">
					<license-p>Este es un artículo publicado en acceso abierto bajo una licencia Creative Commons</license-p>
				</license>
			</permissions>
			<abstract>
				<title>Resumen</title>
				<sec>
					<title>Introducción: </title>
					<p>La deficiencia de hormona de crecimiento (DHC) es una enfermedad endocrina caracterizada por una producción insuficiente de esta hormona por la glándula pituitaria. Las causas pueden ser congénitas o adquiridas.</p>
				</sec>
				<sec>
					<title>Objetivo: </title>
					<p>Realizar una revisión sobre las causas, características clínicas, diagnóstico y tratamiento del déficit de hormona de crecimiento en el adulto.</p>
				</sec>
				<sec>
					<title>Métodos: </title>
					<p>La bibliografía fue consultado en diversas bases de datos, principalmente PUBMED y Elsevier. </p>
				</sec>
				<sec>
					<title>Resultados:</title>
					<p> La hormona de crecimiento (HC) en la edad adulta está implicada en múltiples órganos y procesos fisiológicos; como metabolismo de sustratos, remodelación ósea, composición corporal, función física y psicosocial, su déficit tiene efectos a nivel de todos estos procesos, efectos que son potencialmente reversibles con la suplementación hormonal. </p>
				</sec>
				<sec>
					<title>Conclusiones: </title>
					<p>El déficit de hormona de crecimiento en la edad adulta es una enfermedad poco diagnosticada por lo cual muchas veces los pacientes no reciben el tratamiento indicado, pero cuyos efectos abarcan múltiples órganos y procesos fisiológicos, síntomas que pueden mejorar con la suplementación hormonal, proporcionando al paciente una mejor calidad de vida. </p>
				</sec>
			</abstract>
			<trans-abstract xml:lang="en">
				<title>Abstract</title>
				<sec>
					<title>Introduction: </title>
					<p>Growth hormone deficiency (GHD) is an endocrine disease characterized by insufficient production of this hormone by the pituitary gland. The causes can be congenital or acquired.</p>
				</sec>
				<sec>
					<title>Objective:</title>
					<p> To review the causes, clinical features, diagnosis, and treatment of growth hormone deficiency in adults.</p>
				</sec>
				<sec>
					<title>Methods:</title>
					<p> The bibliography was consulted in several databases, mainly PUBMED and Elsevier. </p>
				</sec>
				<sec>
					<title>Results:</title>
					<p> Growth hormone (GH) in adulthood is involved in multiple organs and physiological processes, such as substrate metabolism, bone remodeling, body composition, physical and psychosocial function, its deficit has effects at the level of all these processes, effects that are potentially reversible with hormone supplementation. </p>
				</sec>
				<sec>
					<title>Conclusions:</title>
					<p> growth hormone deficiency in adulthood is an underdiagnosed disease for which many times patients do not receive the indicated treatment, but whose effects include multiple organs and physiological processes, symptoms that can be improved with hormonal supplementation, providing the patient with a better quality of life.</p>
				</sec>
			</trans-abstract>
			<kwd-group xml:lang="es">
				<title>Palabras clave:</title>
				<kwd>Hormona de crecimiento</kwd>
				<kwd>déficit de hormona de crecimiento</kwd>
				<kwd>estimulación de hormona del crecimiento</kwd>
				<kwd>terapia de reemplazo</kwd>
			</kwd-group>
			<kwd-group xml:lang="en">
				<title>Keywords:</title>
				<kwd>growth hormone</kwd>
				<kwd>adult, growth hormone deficiency</kwd>
				<kwd>growth hormone stimulation</kwd>
				<kwd>replacement therapy</kwd>
			</kwd-group>
			<counts>
				<fig-count count="1"/>
				<table-count count="2"/>
				<equation-count count="0"/>
				<ref-count count="62"/>
				<page-count count="0"/>
			</counts>
		</article-meta>
	</front>
	<body>
		<p>
			<table-wrap id="t1">
				<caption>
					<title>Contribución clave del estudio</title>
				</caption>
				<table>
					<colgroup>
						<col/>
						<col/>
					</colgroup>
					<tbody>
						<tr>
							<td align="left">Objetivo</td>
							<td align="left"> Realizar una revisión sobre las causas, características clínicas, diagnóstico y tratamiento del déficit de hormona de crecimiento en el adulto </td>
						</tr>
						<tr>
							<td align="left">Diseño del estudio</td>
							<td align="left"> Revisión narrativa </td>
						</tr>
						<tr>
							<td align="left">Fuente de información</td>
							<td align="left"> La bibliografía fue consultado en diversas base de datos, principalmente PUBMED y Elsevier </td>
						</tr>
						<tr>
							<td align="left">Población / muestra</td>
							<td align="left"> 62 articulos </td>
						</tr>
						<tr>
							<td align="left"> Análisis estadísticos</td>
							<td align="left">N. A.. </td>
						</tr>
						<tr>
							<td align="left">Principales hallazgos</td>
							<td align="left"> El déficit de hormona de crecimiento en la edad adulta es una enfermedad poco diagnosticada, cuyos efectos abarcan múltiples órganos y procesos fisiológicos, síntomas que pueden mejorar con la suplementación hormonal, proporcionando al paciente una mejor calidad de vida.</td>
						</tr>
					</tbody>
				</table>
			</table-wrap>
		</p>
		<sec sec-type="intro">
			<title>Introducción</title>
			<p>En la niñez, el efecto de la hormona de crecimiento (HC) se sobreentiende por su nombre, pero en la edad adulta, se ha demostrado su implicación en múltiples órganos y procesos fisiológicos; como metabolismo de sustratos, remodelación ósea, composición corporal, función física y psicosocial <xref ref-type="bibr" rid="B1"><sup>1</sup></xref>.</p>
			<p>El síndrome clínico de déficit de hormona de crecimiento (DHC) en adultos es una consecuencia de la disminución de la secreción de HC de la hipófisis anterior, ya sea por enfermedad hipofisaria o hipotalámica estructural o a la irradiación craneal por otras patologías y, por lo tanto, generalmente ocurre en el contexto de características adicionales de hipopituitarismo <xref ref-type="bibr" rid="B2"><sup>2</sup></xref>.</p>
			<p>Se debe tener claridad que los adultos pueden tener DHC de inicio en la niñez o DHC de inicio en la edad adulta <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>
			</p>
		</sec>
		<sec>
			<title>Epidemiología</title>
			<p>El déficit de hormona de crecimiento en adultos es un trastorno poco común, con una afectación estimada de 1 de cada 100,000 individuos por año. Sin embargo, su incidencia es de aproximadamente 2 casos por 100,000 habitantes cuando se tienen en cuenta los pacientes con DHC de inicio en la infancia <xref ref-type="bibr" rid="B4"><sup>4</sup></xref><sup>,</sup><xref ref-type="bibr" rid="B5"><sup>5</sup></xref>; sin embargo, se cree que el trastorno está subestimado debido a la falta de reconocimiento y diagnóstico adecuados. </p>
		</sec>
		<sec>
			<title>Fisiología de la hormona de crecimiento en el adulto</title>
			<p>La HC es una proteína de cadena sencilla con 191 aminoácidos y dos enlaces disulfuro, secretada por las células somatotrofas ubicadas principalmente en las alas laterales de la hipófisis anterior, es liberada en pulsos regulares, principalmente durante el sueño profundo <xref ref-type="bibr" rid="B6"><sup>6</sup></xref>. Una vez en sangre, la hormona de crecimiento estimula el hígado para producir factor de crecimiento similar a la insulina (IGF-1) que desempeña un papel importante en el crecimiento óseo y muscular, así como en el metabolismo de los carbohidratos y grasas <xref ref-type="bibr" rid="B7"><sup>7</sup></xref>.</p>
		</sec>
		<sec>
			<title>Causas de déficit de hormona de crecimiento en el adulto</title>
			<p>Existen varias causas de déficit de hormona de crecimiento en el adulto (<xref ref-type="table" rid="t2">Tabla 1</xref>), siendo las más comunes la presencia previa de un déficit de hormona de crecimiento en la infancia o adolescencia, enfermedades que afectan al hipotálamo o a la glándula pituitaria, antecedentes de radioterapia o cirugía de cabeza y cuello, así como el envejecimiento natural <xref ref-type="bibr" rid="B8"><sup>8</sup></xref>. El estudio KIMS reveló que los adenomas hipofisiarios junto con los craneofaringiomas representan el 57 % de las causas de DHC <xref ref-type="bibr" rid="B9"><sup>9</sup></xref>.</p>
			<p>
				<table-wrap id="t2">
					<label>Tabla 1</label>
					<caption>
						<title>causas de deficiencia de hormona de crecimiento en el adulto</title>
					</caption>
					<table>
						<colgroup>
							<col/>
						</colgroup>
						<thead>
							<tr>
								<th align="left">Etiología del déficit de hormona de crecimiento en el adulto</th>
							</tr>
						</thead>
						<tbody>
							<tr>
								<td align="left">Congénitas</td>
							</tr>
							<tr>
								<td align="left">Defectos de factores de transcripción, defectos en el gen del receptor de hormona liberadora de hormona de crecimiento (GHRH), defectos en el gen de HC</td>
							</tr>
							<tr>
								<td align="left">Defectos estructurales cerebrales de la línea media</td>
							</tr>
							<tr>
								<td align="left">Labio leporino/paladar hendido</td>
							</tr>
							<tr>
								<td align="left">Enfermedad hipotálamo/pituitaria</td>
							</tr>
						</tbody>
						<tbody>
							<tr>
								<td align="left">Tumores</td>
							</tr>
							<tr>
								<td align="left">Adenomas pituitarios secretores y no secretores</td>
							</tr>
							<tr>
								<td align="left">Craneofaringioma, meningioma, germinoma, quistes, glioma, hamartoma, metástasis.</td>
							</tr>
						</tbody>
						<tbody>
							<tr>
								<td align="left">Enfermedades inflamatorias/infiltrativas</td>
							</tr>
							<tr>
								<td align="left">Hipofisitis linfocítica, sarcoidosis, histiocitosis X, hipofisitis granulomatosa, amiloidosis </td>
							</tr>
						</tbody>
						<tbody>
							<tr>
								<td align="left">Infecciones </td>
							</tr>
							<tr>
								<td align="left">Tuberculosis</td>
							</tr>
							<tr>
								<td align="left">Bacterianas</td>
							</tr>
							<tr>
								<td align="left">Virales</td>
							</tr>
							<tr>
								<td align="left">Fúngicas </td>
							</tr>
							<tr>
								<td align="left">Parasitarias</td>
							</tr>
						</tbody>
						<tbody>
							<tr>
								<td align="left">Vasculares</td>
							</tr>
							<tr>
								<td align="left">Apoplejía pituitaria</td>
							</tr>
							<tr>
								<td align="left">Síndrome de Sheehan´s</td>
							</tr>
							<tr>
								<td align="left">Hemorragia subaracnoidea</td>
							</tr>
						</tbody>
						<tbody>
							<tr>
								<td align="left">Iatrogénicas </td>
							</tr>
							<tr>
								<td align="left">Daño hipotalámico/pituitario por cirugía o radiación </td>
							</tr>
							<tr>
								<td align="left">Inducido por drogas: (análogos de somatostatina, terapias con anticuerpos monoclonales, interferones, inhibidores del punto de control.</td>
							</tr>
						</tbody>
						<tbody>
							<tr>
								<td align="left">Otras</td>
							</tr>
							<tr>
								<td align="left">Trauma craneoencefálico</td>
							</tr>
						</tbody>
					</table>
					<table-wrap-foot>
						<fn id="TFN1">
							<p>Adaptado de: Feldt et al. <xref ref-type="bibr" rid="B10"><sup>10</sup></xref>
							</p>
						</fn>
					</table-wrap-foot>
				</table-wrap>
			</p>
		</sec>
		<sec>
			<title>Manifestaciones clínicas y de laboratorio</title>
			<p>Las manifestaciones clínicas del déficit de hormona de crecimiento en el adulto pueden variar ampliamente y son inespecíficas, lo que puede dificultar el diagnóstico <xref ref-type="bibr" rid="B11"><sup>11</sup></xref>.</p>
			<p>Sin embargo, los síntomas pueden incluir pérdida de fuerza muscular y resistencia física, aumento en la grasa corporal especialmente alrededor del abdomen, disminución de la densidad mineral ósea y mayor riesgo de fracturas, alteraciones en el sueño como insomnio o somnolencia diurna excesiva y reducción en la calidad de vida <xref ref-type="bibr" rid="B12"><sup>12</sup></xref>. Además, también se pueden observar cambios metabólicos como intolerancia a los carbohidratos e hiperlipidemia <xref ref-type="bibr" rid="B13"><sup>13</sup></xref>.</p>
			<sec>
				<title>Composición corporal</title>
				<p>El DHC implica cambios significativos en la composición corporal con incrementos en el porcentaje de grasa y, en particular, la masa grasa visceral; concomitantemente a esto se ha evidenciado reducción de masa magra, esto asociado a disminución de tolerancia al ejercicio y de fuerza muscular <xref ref-type="bibr" rid="B14"><sup>14</sup></xref><sup>-</sup><xref ref-type="bibr" rid="B16"><sup>16</sup></xref>. Hay diversos métodos para medir estos cambios, como la absorciometría de rayos X de energía dual (DEXA), la impedancia bioeléctrica, la tomografía computarizada o la medición de la relación circunferencia cintura/cadera. Es importante destacar que, aunque la prevalencia de la obesidad aumenta en adultos con este déficit, el aumento de la grasa visceral también es evidente en aquellos pacientes que no son obesos <xref ref-type="bibr" rid="B10"><sup>10</sup></xref>.</p>
			</sec>
			<sec>
				<title>Metabolismo de la glucosa</title>
				<p>El DHC en adultos se asocia con una resistencia relativa a la insulina <xref ref-type="bibr" rid="B17"><sup>17</sup></xref>, y mayor prevalencia de intolerancia a la glucosa y diabetes mellitus <xref ref-type="bibr" rid="B10"><sup>10</sup></xref>; que se observan principalmente en pacientes mujeres con aumento de masa grasa vísceral <xref ref-type="bibr" rid="B9"><sup>9</sup></xref>. Estudios muestran datos contradictorios al respecto, algunos han documentado beneficio claro con mejoría en el metabolismo de glucosa y sensibilidad a la insulina <xref ref-type="bibr" rid="B18"><sup>18</sup></xref>, pero otras investigaciones no han observado ningún efecto <xref ref-type="bibr" rid="B19"><sup>19</sup></xref><sup>,</sup><xref ref-type="bibr" rid="B20"><sup>20</sup></xref>; Elbornsson <italic>et al</italic>. <xref ref-type="bibr" rid="B21"><sup>21</sup></xref>, en un estudio de seguimiento a 15 años en pacientes con DHC, evidenciaron que el nivel de glucosa en plasma en ayunas aumentó a lo largo del período de estudio de 79.2 mg/dL a 86.5 mg/dL (p &lt;0.001), mientras que el nivel de hemoglobina glicosilada en sangre disminuyó de 5% a 4.6% (p &lt;0.001). Esta disparidad de resultados tiene relación al parecer con la duración del tratamiento, la sustitución de HC a corto plazo (hasta 1 año) parece deteriorar el metabolismo de la glucosa, mientras que el tratamiento a largo plazo no provocó variaciones significativas, por el contrario, se observaron niveles de glucosa en ayunas ligeramente más bajos <xref ref-type="bibr" rid="B22"><sup>22</sup></xref>.</p>
			</sec>
			<sec>
				<title>Metabolismo lipídico</title>
				<p>Los adultos que experimentan deficiencia de hormona del crecimiento comúnmente presentan cambios notables en su perfil lipídico <xref ref-type="bibr" rid="B10"><sup>10</sup></xref>. Estudios han demostrado una elevación de las lipoproteínas de baja densidad (LDL) y triglicéridos en ambos géneros, mientras que se observa una disminución de lipoproteínas de alta densidad (HDL) solo entre mujeres <xref ref-type="bibr" rid="B21"><sup>21</sup></xref>.</p>
				<p>Diversas investigaciones indican que la terapia de reemplazo hormonal puede tener un impacto positivo en el perfil lipídico de pacientes con déficit de hormona de crecimiento. Específicamente, hubo una disminución significativa del colesterol total y el LDL, con un aumento en el HDL <xref ref-type="bibr" rid="B23"><sup>23</sup></xref><sup>,</sup><xref ref-type="bibr" rid="B24"><sup>24</sup></xref>. Sin embargo, el efecto de la terapia sobre los niveles de triglicéridos al parecer es neutro <sup>(21)</sup>.</p>
			</sec>
			<sec>
				<title>Metabolismo óseo</title>
				<p>El DHC se ve asociado a reducción de actividad de formación y resorción ósea, posterior al inicio de tratamiento con reemplazo de HC esta afectación se revierte, evidenciándose incremento en marcadores de formación y reabsorción ósea <xref ref-type="bibr" rid="B25"><sup>25</sup></xref>. Sin embargo, el aumento en la densidad mineral ósea (DMO es evidente únicamente después de 18 meses de tratamiento, siendo esta mejoría más obvia en hombres que en mujeres <xref ref-type="bibr" rid="B26"><sup>26</sup></xref>.</p>
				<p>Ha venido en incremento la evidencia que la mejoría de la DMO reduciría las tasas de fractura con el reemplazo de HC, así lo evidencia en su estudio de cohorte prospectivo Daojun Mo <italic>et al</italic>. <xref ref-type="bibr" rid="B27"><sup>27</sup></xref>, en pacientes con deficiencia de HC manejados con reemplazo hormonal previo a la aparición de osteoporosis presentan menor riesgo de fractura en comparación con los que no reciben tratamiento.</p>
			</sec>
			<sec>
				<title>Calidad de vida</title>
				<p>Es claro el efecto del DHC en el deterioro del bienestar psicológico y la calidad de vida, esta condición al ser cuantificada con diversos cuestionarios <xref ref-type="bibr" rid="B28"><sup>28</sup></xref>, se ha convertido en la principal indicación para la terapia de reemplazo con HC <xref ref-type="bibr" rid="B29"><sup>29</sup></xref>. posterior al inicio de reemplazo hormonal, los pacientes reportan mejoría continua en niveles de energía, sin observarse deterioro en otras áreas de calidad de vida como el estado de ánimo, la ansiedad y la interacción social <xref ref-type="bibr" rid="B30"><sup>30</sup></xref>.</p>
			</sec>
		</sec>
		<sec>
			<title>Diagnóstico</title>
			<sec>
				<title>¿Quién debe ser evaluado? </title>
				<p>Debido a que las manifestaciones de la DHC son sutiles e inespecíficas, la evaluación de este trastorno debe realizarse solo en personas con una alta probabilidad de deficiencia de HC:</p>
				<p>
					<list list-type="bullet">
						<list-item>
							<p>Adultos con enfermedad hipotalámica o hipofisaria conocida. El diagnóstico de DHC en adultos es probable si el paciente tiene panhipopituitarismo documentado. Una concentración sérica baja de IGF-1 confirma el diagnóstico de DHC en estos pacientes; no se requieren pruebas de provocación <xref ref-type="bibr" rid="B31"><sup>31</sup></xref>
							</p>
						</list-item>
						<list-item>
							<p>Adultos con antecedentes de DHC en la infancia <xref ref-type="bibr" rid="B31"><sup>31</sup></xref>.</p>
						</list-item>
					</list>
				</p>
				<p>La lesión cerebral traumática y la hemorragia subaracnoidea ahora son condiciones clínicas reconocidas que pueden causar DHC, pero debido a que la DHC puede ser transitoria en estos pacientes, las pruebas de estimulación con DHC deben realizarse solo después de al menos 12 meses después del evento <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>. </p>
			</sec>
			<sec>
				<title>IGF-1 sérico</title>
				<p>Un diagnóstico de deficiencia de GH se confirma si la concentración sérica del IGF-1 está por debajo del límite inferior normal específico para la edad y el sexo en pacientes con enfermedad pituitaria orgánica <xref ref-type="bibr" rid="B32"><sup>32</sup></xref>. </p>
				<p>
					<fig id="f1">
						<label>Figura 1</label>
						<caption>
							<title>Estudios para el diagnóstico de déficit de HC. TTI: test de tolerancia a la insulina, TEG: test de estimulación con glucagón, HC: Hormona de crecimiento</title>
						</caption>
						<graphic xlink:href="2665-427X-ijeph-6-01-e-10228-gf1.jpg"/>
					</fig>
				</p>
			</sec>
			<sec>
				<title>Pruebas de provocación </title>
				<p>Si el IGF-1 es equívoco, una respuesta subnormal de HC a una prueba de provocación confirmará el diagnóstico. Es más probable que todas las pruebas de secreción de HC den resultados falsos positivos en la obesidad. Todos se realizan por la mañana después de un ayuno nocturno. Debido a que la obesidad afecta la liberación de HC, el límite de HC para diagnosticar la deficiencia debe ser más bajo para los pacientes obesos que para los de peso normal <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>.</p>
				<sec>
					<title>Elección de la prueba</title>
					<p>
						<list list-type="bullet">
							<list-item>
								<p>En los países donde la hormona liberadora de HC (GHRH, por sus siglas en inglés) está disponible, se recomienda la prueba de arginina-HLHC. </p>
							</list-item>
							<list-item>
								<p>En países donde la GHRH no está disponible, se recomienda la prueba de estimulación con macimorelina (<xref ref-type="fig" rid="f1">Figura 1</xref>). </p>
							</list-item>
							<list-item>
								<p>Si no se dispone de GHRH ni de macimorelina, se recomienda una prueba de estimulación con glucagón (<xref ref-type="fig" rid="f1">Figura 1</xref>).</p>
							</list-item>
						</list>
					</p>
				</sec>
				<sec>
					<title>Prueba de estimulación con macimorelina </title>
					<p> La macimorelina es un agonista sintético del receptor de grelina que, cuando se administra por vía oral, estimula la HC de manera dependiente de la dosis <xref ref-type="bibr" rid="B33"><sup>33</sup></xref>. Las pautas dada por la <bold>Asociación Estadounidense de Endocrinólogos</bold> seleccionó el punto de corte de HC de 2.8 μg/L para diferenciar pacientes con secreción normal de HC de aquellos con DHC. Sin embargo, aún no se sabe si los puntos de corte máximos de HC ajustados por el índice de masa corporal (IMC) para esta prueba son necesarios para pacientes obesos y con sobrepeso <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>.</p>
					<p>En un estudio de 166 pacientes con probabilidad graduada de deficiencia de la HC, se comparó la precisión y reproducibilidad de la macimorelina con la prueba de tolerancia a la insulina. Con un límite de HC de 5.1 ng/ml, la prueba de macimorelina tuvo una sensibilidad del 92 %, una especificidad del 96 % y una reproducibilidad del 97 %. Mejorando con este punto de corte de 5.1 ng/ml la sensibilidad y con igual especificidad al comparar con el valor de 2.8 ng/mL <xref ref-type="bibr" rid="B34"><sup>34</sup></xref>.</p>
				</sec>
				<sec>
					<title>Prueba de estimulación con glucagón</title>
					<p>Se realiza administrando 1 mg de glucagón por vía intramuscular (o 1.5 mg para pacientes con peso &gt;90 kg) y midiendo la HC cada 30 minutos durante cuatro horas. Se considera que el punto de corte es &lt;3 ng/mL (&lt;3 mcg/L) para aquellos con peso normal, pero en pacientes obesos, un punto de corte de 1 ng/mL ofrece la mejor sensibilidad y especificidad <xref ref-type="bibr" rid="B35"><sup>35</sup></xref>.</p>
				</sec>
				<sec>
					<title>Arginina-GHRH</title>
					<p>Se administra una dosis en bolo de GHRH, 1 mcg/kg de peso, por vía intravenosa en el tiempo 0, seguida inmediatamente de una infusión intravenosa de clorhidrato de arginina, 0.5 g/kg de peso corporal (hasta un máximo de 30 g) durante 30 minutos. La HC sérica se mide a -30, 0, 30, 60, 90 y 120 minutos <xref ref-type="bibr" rid="B36"><sup>36</sup></xref>. El valor de corte varía según la circunferencia de la cintura, el IMC y la edad <xref ref-type="bibr" rid="B37"><sup>37</sup></xref>.</p>
				</sec>
				<sec>
					<title>Hipoglucemia inducida por insulina </title>
					<p>Se administran 0.1 unidades de insulina x kg de peso corporal por vía intravenosa y se miden la glucosa y la HC en suero (o sangre) antes y 15, 30, 60, 90 y 120 minutos después de la inyección <xref ref-type="bibr" rid="B38"><sup>38</sup></xref>. Un aumento por debajo de lo normal en la HC sérica (&lt;5.1 ng/mL ó 5.1 mcg/L) confirma el diagnóstico de DHC. Esta prueba se usa cada vez con menos frecuencia, debido a problemas de seguridad, laboriosidad, potencial para causar hipoglucemia grave y contraindicación en ciertos pacientes, como pacientes de edad avanzada, trastornos convulsivos y enfermedad cardiovascular o cerebrovascular <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>.</p>
				</sec>
			</sec>
		</sec>
		<sec>
			<title>Tratamiento</title>
			<sec>
				<title>Efectos del tratamiento </title>
				<p>Existe evidencia sustancial de que el tratamiento con HC en adultos que adquirieron DHC en la edad adulta da como resultado un aumento de la masa muscular <xref ref-type="bibr" rid="B39"><sup>39</sup></xref>, una disminución de la grasa corporal <xref ref-type="bibr" rid="B40"><sup>40</sup></xref><sup>-</sup><xref ref-type="bibr" rid="B42"><sup>42</sup></xref> y una mejora en algunos parámetros de la función cardíaca <xref ref-type="bibr" rid="B43"><sup>43</sup></xref>. La evidencia de mejoría en la densidad mineral ósea (DMO) es menos convincente <xref ref-type="bibr" rid="B44"><sup>44</sup></xref><sup>,</sup><xref ref-type="bibr" rid="B45"><sup>45</sup></xref> y la evidencia de mejoría en la sensación de bienestar, fuerza muscular, lípidos séricos y otros marcadores de riesgo cardiovascular es contradictoria <xref ref-type="bibr" rid="B46"><sup>46</sup></xref><sup>-</sup><xref ref-type="bibr" rid="B52"><sup>52</sup></xref>. Los datos sobre el efecto del tratamiento con HC en la mortalidad son limitados <xref ref-type="bibr" rid="B53"><sup>53</sup></xref>.</p>
			</sec>
			<sec>
				<title>Protocolo de tratamiento</title>
				<sec>
					<title>Diariamente </title>
					<p>Las preparaciones de HC humana recombinante diaria (rhGH, por sus siglas en inglés) se administra mediante inyección subcutánea una vez al día, normalmente por la noche. El objetivo inicial es comenzar con una dosis más baja que la de mantenimiento y aumentar gradualmente la dosis (para minimizar los efectos secundarios). El objetivo final es encontrar la dosis de HC que mantenga la concentración sérica de IGF-1 dentro de la mitad del rango normal ajustado por edad <xref ref-type="bibr" rid="B31"><sup>31</sup></xref><sup>,</sup><xref ref-type="bibr" rid="B54"><sup>54</sup></xref>. </p>
					<p>
						<list list-type="bullet">
							<list-item>
								<p>Dosis inicial: 2 a 5 mcg/kg de peso corporal una vez al día, buscando una menor dosis en hombres, mujeres que toman estrógeno por vía transdérmica y mayores de 60 años, y una mayor dosis para mujeres que toman estrógeno por vía oral <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>
								</p>
							</list-item>
							<list-item>
								<p>Comenzar con dosis bajas y aumentar gradualmente hasta que la concentración sérica de IGF-1 sea normal <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>
								</p>
							</list-item>
							<list-item>
								<p>Si la concentración sérica de IGF-1 no ha aumentado dentro del rango normal después de dos meses, la dosis diaria debe aumentarse gradualmente en incrementos de 1 a 2 mcg/kg en intervalos de dos meses hasta que sea normal <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>
								</p>
							</list-item>
							<list-item>
								<p>Si se producen efectos secundarios o la concentración sérica de IGF-1 aumenta por encima de lo normal en cualquier dosis, se debe disminuir la dosis <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>.</p>
							</list-item>
						</list>
					</p>
				</sec>
				<sec>
					<title>Semanalmente</title>
					<p>Somapacitan es una formulación de HC de unión a albúmina de acción prolongada aprobada para el tratamiento una vez por semana de adultos con DHC. Los regímenes semanales y diarios de HC redujeron de manera similar la grasa visceral y aumentaron de manera similar la masa corporal magra total y la masa muscular esquelética de las extremidades. La terapia de GH semanal es más conveniente que la terapia de HC diaria, pero puede ser un poco menos efectiva en la grasa del tronco <xref ref-type="bibr" rid="B55"><sup>55</sup></xref>.</p>
				</sec>
			</sec>
			<sec>
				<title>Duración de la terapia</title>
				<p>Actualmente, no hay acuerdo sobre la duración del tratamiento para adultos con DHC, pero la recomendación general es continuar el tratamiento indefinidamente. Pero algunos pacientes están cansados ​​de las inyecciones diarias, mientras que otros pueden tener dificultades con las compañías de seguros de salud.</p>
				<p>Una revisión sistemática de 23 estudios de terapia a largo plazo (5 a 15 años) con HC encontró que puede haber algunos efectos sostenidos sobre la composición corporal, el perfil de lípidos, el grosor de la íntima-media carotídea y la DMO, pero no se ha sugerido ningún efecto sobre la fuerza muscular <xref ref-type="bibr" rid="B56"><sup>56</sup></xref>. Estos datos son difíciles de interpretar sin un grupo de comparación de pacientes similares con deficiencia de GH no tratados.</p>
				<p>En un estudio de 60 pacientes adultos con diagnóstico de hipopituitarismo y un uso de HC por lo menos durante tres años, fueron aleatorizados para continuar la HC o uso de placebo, los que tomaron placebo mostraron un aumento en la circunferencia de la cintura y grasa visceral y subcutánea en comparación con los pacientes que continuaron con HC. Los pacientes tratados con placebo también tenían proteína C reactiva elevada y niveles elevados de colesterol LDL y HDL, al tiempo que mejoraron la sensibilidad a la insulina y la hemoglobina glicosilada disminuyó. No hubo diferencia en cuanto a la calidad de vida <xref ref-type="bibr" rid="B57"><sup>57</sup></xref>.</p>
				<sec>
					<title>Monitoreo</title>
					<p>Los niveles séricos de IGF-1 siguen siendo el biomarcador más utilizado para los ajustes de dosis y el seguimiento de estos pacientes. Se recomienda medir el IGF-1 sérico a los 2 meses de iniciado el tratamiento y posteriormente repetir cada 6-12 meses una vez que el IGF-1 sérico esté dentro del rango normal <xref ref-type="bibr" rid="B3"><sup>3</sup></xref>. </p>
					<p>El tratamiento con GH debe elevar los niveles séricos de IGF-1 dentro, pero no más allá, del rango normal específico de la edad para evitar el reemplazo excesivo <xref ref-type="bibr" rid="B58"><sup>58</sup></xref>. En un estudio clínico aleatorizado y abierto, <xref ref-type="bibr" rid="B59"><sup>59</sup></xref> demostraron que en adultos tratados con reemplazo de rhGH para alcanzar un nivel objetivo de IGF-1 normal alto, la circunferencia de la cintura disminuyó y la calidad de vida mejoró en comparación con aquellos con un nivel objetivo de IGF-1 normal bajo, pero los niveles séricos de IGF-1 que fueron más altos, se asociaron con más mialgia y niveles séricos más bajos de IGF-1 con fatiga más general.</p>
				</sec>
				<sec>
					<title>Efectos secundarios</title>
					<p>Los efectos secundarios más comunes del tratamiento con HC en adultos con hipopituitarismo son edema periférico, artralgias, síndrome del túnel carpiano, parestesias <xref ref-type="bibr" rid="B60"><sup>60</sup></xref> y empeoramiento de la tolerancia a la glucosa <xref ref-type="bibr" rid="B61"><sup>61</sup></xref>. Los efectos adversos se basan en niveles séricos elevados de IGF-1 durante el tratamiento <xref ref-type="bibr" rid="B60"><sup>60</sup></xref>
					</p>
					<p>La malignidad activa se considera una contraindicación para el tratamiento con HC debido a la posibilidad teórica de que el tratamiento con HC pueda estimular el crecimiento tumoral, pero la evidencia actualmente disponible respalda estas preocupaciones <xref ref-type="bibr" rid="B62"><sup>62</sup></xref>.</p>
				</sec>
			</sec>
		</sec>
	</body>
	<back>
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