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In respiratory physiology, the ventilation/perfusion ratio ( V/Q ratio) is a ratio used to assess the efficiency and adequacy of the ventilation-perfusion coupling and thus the matching of two variables: V – ventilation – the air that reaches the alveoli. Q – perfusion – the blood that reaches the alveoli via the capillaries.
Oxygen toxicity is a concern for underwater divers, those on high concentrations of supplemental oxygen, and those undergoing hyperbaric oxygen therapy . The result of breathing increased partial pressures of oxygen is hyperoxia, an excess of oxygen in body tissues. The body is affected in different ways depending on the type of exposure.
Many people with chronic obstructive pulmonary disease have a low partial pressure of oxygen in the blood and high partial pressure of carbon dioxide. Treatment with supplemental oxygen may improve their well-being; alternatively, in some this can lead to the adverse effect of elevating the carbon dioxide content in the blood ( hypercapnia) to ...
Ventilation-perfusion coupling is the relationship between ventilation and perfusion, represented by the ventilation-perfusion ratio (V/Q). Ventilation rate (V) is the total gas volume that enters and leaves the alveoli in a given amount of time, commonly measured per minute. To calculate the ventilation rate, the tidal volume (inhaled or ...
The respiratory quotient ( RQ) is the ratio: RQ = CO 2 eliminated / O 2 consumed. where the term "eliminated" refers to carbon dioxide (CO 2) removed from the body. In this calculation, the CO 2 and O 2 must be given in the same units, and in quantities proportional to the number of molecules. Acceptable inputs would be either moles, or else ...
Schedule an appointment if you consistently get readings of 130/80 mm Hg or higher, which is considered elevated blood pressure, or 140/90 mm Hg or higher, which indicates hypertension.
Oxygen saturation (symbol SO2) is a relative measure of the concentration of oxygen that is dissolved or carried in a given medium as a proportion of the maximal concentration that can be dissolved in that medium at the given temperature. It can be measured with a dissolved oxygen probe such as an oxygen sensor or an optode in liquid media ...
The limiting oxygen concentration ( LOC ), [1] also known as the minimum oxygen concentration ( MOC ), [2] is defined as the limiting concentration of oxygen below which combustion is not possible, independent of the concentration of fuel. It is expressed in units of volume percent of oxygen. The LOC varies with pressure and temperature.