Treatment With a Growth Hormone Secretagogue in a Model of Developing Heart Failure

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Abstract
{abs}Background—Exogenous administration of growth hormone (GH) and subsequently increased production of insulin-like growth factor-1 can influence left ventricular (LV) myocardial growth and geometry in the setting of congestive heart failure (CHF). This study determined the effects of an orally active GH secretagogue (GHS) treatment that causes a release of endogenous GH on LV function and myocyte contractility in a model of developing CHF. Methods and Results—Pigs were randomly assigned to the following treatment groups: (1) chronic rapid pacing at 240 bpm for 3 weeks (n=11); (2) chronic rapid pacing and GHS (CP-424,391 at 10 mg·kg−1·d−1, n=9); and (3) sham controls (n=8). In the untreated pacing CHF group, LV fractional shortening was reduced (21±2% versus 47±2%) and peak wall stress increased (364±21 versus 141±5 g/cm2) from normal control values (P2) than untreated CHF values (PPPConclusions—The improved LV pump function that occurred with GHS treatment in this model of CHF was most likely a result of favorable effects on LV myocardial remodeling and contractile processes. On the basis of these results, further studies are warranted to determine the potential role of GH secretagogues in the treatment of CHF.

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