Electric Impedance Recording - A Noninvasive Method of Rejection Diagnosis Johannes Mueller, Henning Warnecke, Onnen Grauhan, Birgit Nelson, Tatjana Cohnert and Roland Hetzer J Extra Corpor Technol, 23 3 (1991) 49-55 Published online: 21 August 2023 DOI: 10.1051/ject/199123349