EVALUATION OF TRANS-THORACIC ELECTRICAL-IMPEDANCE IN THE DIAGNOSIS OF PULMONARY-EDEMA
EVALUATION OF TRANS-THORACIC ELECTRICAL-IMPEDANCE IN THE DIAGNOSIS OF PULMONARY-EDEMA
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DOI：
10.1161/01.cir.60.5.1156
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发表时间：
1979-01-01
期刊：
影响因子：
37.8
通讯作者：
MURRAY, JF
中科院分区：
文献类型：
--
作者：
FEIN, A;GROSSMAN, RF;MURRAY, JF
To evaluate the clinical usefulness of measuring transthoracic electrical impedance in patients with pulmonary edema, 27 normal subjects and 33 patients were studied. In normal subjects impedance increased when body position changed from supine to standing (P < 0.01)and when lung volume increased from residual volume to total lung capacity (P < 0.01). Impedance values varied (.+-. 2.7 .OMEGA.) when measured on 4 separate days but were relatively constant (.+-. 0.7.OMEGA.) when measured hourly without removing the electrodes. In only 5 of 11 patients with clinically severe pulmonary edema and 5 of 8 with radiologically severe pulmonary edema were impedance values outside the normal range. Changes in impedance values correlated with changes in clinical and radiographic indexes of pulmonary edema. Single measurements of impedance are useless in diagnosing pulmonary edema. Impedance changes as predicted, as pulmonary edema increases and decreases, and these changes are readily detected by simpler methods of evaluation.
