Transcutaneous aortovelography. A new window on the circulation?

Clinical need absence of dyskinesia (Gibson, 1973; Sweet et al., 1975). Even when this can be excluded, the method Any quantitative description of a transport system is hardly suitable for repeated use in the wards, as iS seriously deficient if it does notmiclude iformareproducibility depends on a meticulous and timetion on the volume of flow carnied. Yet perforcconsuming technique. such are the difficulties of obtaining a reliable index Thoracic impedance plethysmography (Baker et al., of blood flow-the management of a pallent severely 1971; Kubicek et al., 1974) is still the subject of ill with a circulatory disorder is usually based on much controversy. Once the four electrode bands variables, like the arterial or pulmonary wedge (which contribute to the stability of observations) pressure, etc. which have only a tenuous relation to have been applied, readings can be obtained in systemic blood flow. While the experience and co-operative or passive patients during momentary interpretative skill of the clinician can often make interruptions of respiration. The product of the some allowance for the variable and non-hnear maximum rate of change of impedance and the relation which these variables bear to flow, this is an ejection period (the latter often has to be obtained