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All of the following are true concerning neonatal physiology EXCEPT: | All of the following are true concerning neonatal physiology EXCEPT: | ||
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D. Myocardial function is different in neonates because the cardiac myocytes have less organized contractile elements than in children and adults. | D. Myocardial function is different in neonates because the cardiac myocytes have less organized contractile elements than in children and adults. | ||
<div class="mw-customtoggle-TYK_Answer" style="text-align: right; color:#0000ff">Click for Answer</div> | |||
<div class="mw-collapsible- | <div class="mw-collapsible mw-collapsed" id="mw-customcollapsible-TYK_Answer"> | ||
==Answer== | ==Answer== | ||
The answer is C. The TIDAL volume of the neonate is about the same as children and adults (when a ml/kg basis is used). Neonates are particularly sensitive to increases in afterload. This is one reason why phenylephrine or norepinephrine is usually poorly tolerated in this age group. Dramatic increases in afterload may cause decreased cardiac function and output. The parasympathetic system dominates in the neonatal period. Neonatal myocardium is poorly organized (when compared to the older counterparts). This decreased organization is particularly important in the T-tubule system and the subsequent calcium availability. | The answer is C. The TIDAL volume of the neonate is about the same as children and adults (when a ml/kg basis is used). Neonates are particularly sensitive to increases in afterload. This is one reason why phenylephrine or norepinephrine is usually poorly tolerated in this age group. Dramatic increases in afterload may cause decreased cardiac function and output. The parasympathetic system dominates in the neonatal period. Neonatal myocardium is poorly organized (when compared to the older counterparts). This decreased organization is particularly important in the T-tubule system and the subsequent calcium availability. | ||
==Notes== | ==Notes== | ||
<references /> | <references /> | ||
[http://www.frca.co.uk/article.aspx?articleid=100946 Anaesthesia UK:Pharmacology of Opioids II] | |||
==Keywords== | ==Keywords== | ||
</div> | </div> | ||
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