MIP is the pressure created during a maximum inspiration attempt from a closed system. It is usually measured at the level of the residual volume (RV), as the inspiratory muscle strength is inversely proportional to lung volume (in a curved shape).
(D Ed .: Note in German-speaking PI max as a measure of the current strength of the respiratory muscles. MIP.) (And the maximum expiratory pressure MEP d editor’s note. To assess a possible weakness of the respiratory muscles, the maximum inspiratory pressure can.. : in German-speaking determining the P0.1 value rather be useful as a measure of the current load of the respiratory muscles common). MIP is the pressure created during a maximum inspiration attempt from a closed system. It is usually measured at the level of the residual volume (RV), as the inspiratory muscle strength is inversely proportional to lung volume (in a curved shape). MEP is measured during a similar breathing maneuver at the level of total lung capacity (TLC), as the expiratory muscle strength is directly proportional to lung volume. However, the information from these respiratory maneuvers are nonspecific. It can not distinguish between poor employees, muscle weakness or neurological disorders. The maximum voluntary ventilation (MVV) represents a further measurement of neuromuscular and respiratory system. The MVV is the total volume of for 12 s faster, deeper breathing exhaled air, which defines with a predicted MVV as forced expiratory volume in 1 s (FEV1) can be compared × 35 or 40th A significant difference between the expected and the actual MVV may be a sign of inadequate neuromuscular Reserve, pathological respiratory mechanics or lack of patient compliance. A progressive reduction of tidal volume during the study conforms neuromuscular abnormalities, but also comes with hyperinflation as a result of diseases that cause narrowing of the airways, above. The “sniff test” is used occasionally for suspected Zwerchfellparalyse or -parese. Under continuous fluoroscopy, the patient is asked to inhale quickly and strongly ( “sniff” to). By this breathing maneuver the use of other respiratory muscles (such. As the intercostal muscles) minimized. In a weakness of a diaphragm half a limited excursion can or a paradoxical upward movement will be observed in comparison to the contralateral side. Occasionally, EMG studies of diaphragm and N. phrenic be done, but to achieve results and interpret these are great expertise necessary, and the diagnostic accuracy is uncertain. In selected cases, biopsies of muscle and nerve can help.