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Transcutaneous aortovelography. A new window on the circulation?
| Content Provider | Semantic Scholar |
|---|---|
| Author | Light, H. |
| Copyright Year | 1976 |
| Abstract | Any quantitative description of a transport system is hardly suitable for repeated use in the wards, as iS seriously deficient if it does not miclude iforma-reproducibility depends on a meticulous and time-tion on the volume of flow carnied. Yet perforc-consuming 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 cooperative 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 unsatisfactory ~ ~ ~ ~ ~ ~ jecio situatio (th late ofe. aoeotie unsatisfactory situation. using the heart sounds) is interpreted as a measure Much effort has, therefore, gone into the develop-of stroke volume. The correlations with cardiac ment of techniques for the measurement of a hae-output measurements which have been obtained in a modynamic index which closely and reliably reflects number of studies have been variably adequate, but flow. Thus a number of methods for measuring car-convincing correlations with changes in aortic blood diac output using gas uptake or indicator dilution velocity in individual patients were obtained in 6 out techniques, or electromagnetic flowmeters have been of 7 subjects in a pacing study (I. A. B. Brooksby developed; these are of great value when used with and M. M. Webb-Peploe, 1976, personal com-care and within their limitations, which unfortu-munication). This technique appears to be useful nately often affect their accuracy in low-output for following changes in cardiac output in any one states (Prys-Roberts, 1969; Mills, 1972; Chamber-subject provided that cardiac and intrathoracic lain, 1975). However, none of these methods is well conditions do not deviate too far from normal. suited for routine repeated bedside use in intensive Rough estimates of absolute cardiac output may also and coronary care. Most are laborious: the invasive be obtained under … |
| Starting Page | 8083 |
| Ending Page | 8086 |
| Page Count | 4 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://heart.bmj.com/content/heartjnl/38/5/433.full.pdf |
| PubMed reference number | 773393v1 |
| Volume Number | 38 |
| Issue Number | 5 |
| Journal | British heart journal |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Angioedemas, Hereditary Artificial cardiac pacemaker Bands Cardiac Output Cardiography, Impedance Cardiovascular system Cerebrovascular accident Chimeric antigen receptor Estimated Flowmeters Heart Sounds Patients Plethysmography Quantitative impedance Stroke Volume Thoracic Outlet Syndrome Ward (environment) circulatory disorders |
| Content Type | Text |
| Resource Type | Article |
