functional residual capacities การใช้

• Pulmonary plethysmographs are used to measure functional residual capacity.
• Functional residual capacity drops 18 20 %, giving an increase in pulmonary ventilation.
• Total lung capacity also increases, largely as a result of increased functional residual capacity.
• Pulmonary vascular resistance ( PVR ) also depends on the lung volume, and PVR is lowest at the functional residual capacity ( FRC ).
• The end-exhalatory lung volume is now well below the resting mid-position and contains far less air than the resting " functional residual capacity ".
• Functional residual capacity cannot be measured by tests that rely on breathing out, as a person is only able to breathe a maximum of 80 % of their total functional capacity.
• Pulmonary plethysmographs are commonly used to measure the functional residual capacity ( FRC ) of the lungs the volume in the lungs when the muscles of respiration are relaxed and total lung capacity.
• Possibly as the result of depression of the central inspiratory drive, propofol may produce significant decreases in respiratory rate, minute volume, tidal volume, mean inspiratory flow rate, and functional residual capacity.
• The patient is then asked to breathe ( normal breaths ) in the mixture starting from FRC ( functional residual capacity ), which is the gas volume in the lung after a normal breath out.
• The changes brought about by these flows of individual gases into and out of the functional residual capacity necessitate the replacement of about 15 % of the alveolar air with ambient air every 5 seconds or so.
• The total lung capacity ( TLC ), functional residual capacity ( FRC ), residual volume ( RV ), and vital capacity ( VC ) are all values that can be tested using this method.
• For the whole human lung, given an indicative tidal volume of 0.6 L and a functional residual capacity of 2.5 L, average SV is of the order of 0.24.
• :: I thought : static lung volumes don't change-so Total lung capacity, residual volume, functional residual capacity; dynamic lung volumes can change-so tidal volume, forced vital capacity, FEV 1.
• In contrast, partial liquid ventilation ( PLV ) is a technique in which a PFC is instilled into the lung to a volume approximating functional residual capacity ( approximately 40 % of Conventional mechanical ventilation delivers tidal volume breaths on top of it.
• Some practitioners favor airway pressure release ventilation when treating ARDS . Well documented advantages to APRV ventilation include : decreased airway pressures, decreased minute ventilation, decreased dead-space ventilation, promotion of spontaneous breathing, almost 24-hour-a-day alveolar recruitment, decreased use of sedation, near elimination of neuromuscular blockade, optimized arterial blood gas results, mechanical restoration of FRC ( functional residual capacity ), a positive effect on cardiac output ( due to the negative inflection from the elevated baseline with each spontaneous breath ), increased organ and tissue perfusion and potential for increased urine output secondary to increased kidney perfusion.