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Despite being the gold-standard for hemodynamic assessment, right heart catheterization (RHC) was overcome by plasma B-Type Natriuretic Peptide (BNP) levels in daily clinical routine. However, in the first year after heart transplantation (HT), the relationship between BNP and adverse hemodynamics have yielded conflicting results. Purpose The aim of this study was to evaluate whether BNP values can be used to estimate adverse hemodynamics in the first year after HT. Methods Prospective study of consecutive RHC performed in the first year after HT (according to the endomyocardial biopsies program). Plasma BNP levels were measured at the same day. The area under the curve (AUC) was analysed to find the BNP values with higher sensitivity and specificity to detect adverse hemodynamics. Results From 2017 to 2018, 50 RHC were performed. Mean age was 48.7 ± 8.3 years, with mean BNP value of 964.4 ± 1114.7pg/ml. Prediction of adverse hemodynamics by AUC results are represented in the table. BNP values were significantly increased in patients with pulmonary capillary wedge pressure (PCWP) &amp;gt;12mmHg (p &amp;lt; 0.001), cardiac index &amp;lt;2.5L/min/m2 (p = 0.001), mean pulmonary artery pressure (mPAP) ≥25mmHg (p &amp;lt; 0.001), pulmonary vascular resistance &amp;gt; 1,5WU (p = 0.044) and right atrial pressure &amp;gt;5mmHg (p = 0.003). BNP &amp;gt;500pg/ml had a sensitivity of 78.3% and 87.5% and a specificity of 76.0% and 67.7% to detect PCWP &amp;gt;12mmHg and mPAP ≥25mmHg, respectively. Conclusion Significant associations were found between BNP values and adverse hemodynamics in RHC, supporting the clinical utility of BNP in the first year after HT. BNP prediction AUC values SR HEMODYNAMIC PARAMETERS AUC p 95% CI Best BNP value Sensitivity Specificity Pulmonary capillary wedge pressure (PCWP) &amp;gt; 12mmHg 0.798 &amp;lt;0.001 0.671-0.925 &amp;gt; 500pg/ml 78.3% 76.0% Mean pulmonary artery pressure (mPAP) ≥ 25mmHg 0.830 &amp;lt;0.001 0.714-0.946 &amp;gt; 500pg/ml 87.5% 67.7% Cardiac output &amp;lt; 4L/min 0.833 0.002 0.667-1.000 &amp;gt; 1500pg/ml 77.8% 87.5% Cardiac index (CI) &amp;lt; 2.5L/min/m2 0.810 0.001 0.663-0.957 &amp;gt; 1150pg/ml 76.9% 86.1% Pulmonary vascular resistance (PVR) &amp;gt; 1,5WU 0.678 0.044 0.509-0.848 &amp;gt; 200pg/ml 83.3% 47.1% Right atrial pressure (RAP) &amp;gt; 5mmHg 0.744 0.003 0.607-0.880 &amp;gt; 500pg/ml 70.8% 65.4% BNP prediction

P1429 B-Type natriuretic peptide prediction of right catheterization parameters in the first year after heart transplant