<prompt> The most sensitive indicator of depletion of intravascular volume in infant is:Cardiac outputStroke volumeHeart rateBlood pressure  <response>: c. Heart rateRef: Nelsons 20e p 523-525, Ghai 8e p 715-718In infants with shock, compensatory increases in cardiac output are achieved primarily by tachycardia rather than by increase in stroke volume. Heart rates of 190-210min are common in infants with compensated shock. 