INDIRECT CALORIMETRY. 3
the realization of credible results. Likewise, the successful conversion of the free-energy of
nutrients to the chemical energy with specific reference to ATP indicates to the reliability of the
technique (Headley, 2001). The accuracy in identifying energy substrates that are metabolized in
the body at different times indicates the existence of indirect calorimetry.
Despite the benefits of the indirect calorimetry, there are circumstances when it has been
contraindications or rendered useless or when its use is not appropriate. The circumstances
include when there is a disconnection of ventilator support especially for oxygen. Other cases are
when a patient is highly obese and under extreme temperature conditions or in hypothermia
among other conditions.
According to Sion-Sarid et al (2013), the equipment that helps the users of the
technologyy in executing measurement of VO2 and VCO2 in living things is known as the
metabolic cart. The equipment is the one that is used to foster the measurement of the metabolic
rate, the uptake of oxygen (oxygen consumption (VO2)) and the amount of carbon dioxide
produced(carbon dioxide production (VCO2)) (Nguyen et al, 2003). In patients, the equipment
assists in measuring the resting energy expenditure (REE) that in turn helps in determining the
amount of energy necessary. It is also used in measuring the concentration and volume of O2 and
CO2 every minute.
To achieve good results, Respiratory Therapist must be involved. The therapist plays a
critical role in ensuring that every activity is done well from the estimation of REE and BEE,
identification of energy substrates and establishment of the amount of energy that a patient may
need. He follows to ensure that the consumption rate of O2 and production of CO2 is accurate.
His other roles include management of the artificial airways, performance of cardiopulmonary
