43 cats with renal failure (NI) and/or hypertrophic cardiomyopathy (HCMP) underwent a full clinical-cardiological examination. The target values systolic blood pressure, LVPWd, IVSd, LA as well as the covariables LVPWs, IVSs, LVDd, and LVDs increased in the 3 groups (NI, HCMP, NI&HCMP). No significatn correlation between creatinin, systolic blood pressur and LVPWd was found. The results demonstrate the presence of elevated blood pressure in cats with NI which is indicative for the link between NI and HCMP. A comparison between two noninvasive methods of blood pressure measurement (Memoprint®/Ultrasonic Doppler Flow Detector®) showed that under clinical conditions reliable indirect measurements of blood pressure, which is regarded as a diagnostik link between the renal and cardiac condition, can only be obtained by dopplerultrasonographic methods.