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- W2738963630 abstract "Introduction Follow up of Fontan patients involves a multimodality approach including imaging to assess cardiac function and cardiopulmonary exercise testing (CPET) to assess functional capacity. Decision making, including use of device therapy in conventional heart failure patients utilises predominantly structural information. We sought to assess whether cardiac structure as measured by conventional cardiac magnetic resonance parameters was related to functional capacity as assessed by CPET in a large Fontan cohort. Methods 233 Fontan patients under follow up were identified. Of these 76 patients had undergone a CMR and CPET within 12 months. The cohort was divided into 2 groups 1) 47 patients with either a lateral tunnel or total cavo-pulmonary connexion (TCPC group); mean age 19±4 years, 51% male and 2) 29 patients with an atriopulmonary Fontan (AP group); age 29±7 years, 48% male. Results There were no significance differences in imaging parameters between the 2 groups. The peak VO2 was significantly higher in the TCPC group (27±9 ml/kg/min) compared to the AP group (22±8 ml/kg/min, p 0.009) (Table 1). In the TCPC group only 19% of patients had a EF In the TPCP group the end diastolic volume (EDV), end systolic volume (ESV), stroke volume (SV) and ejection fraction (EF) did not correlate with the peak VO2, nor ventilatory product. Ventricular EF negatively correlated to NYHA class (r=−0.41, p 0.005) as did ventricular mass (r=−0.49, p 0.04). Rest partial pressure exhaled CO2 (rest PETCO2) correlated with the EDV (r=0.30, p 0.04) and SV (r=0.32, p 0.03). In the AP group there was no correlation either between EDV, ESV, SV and EF with VO2 peak or ventilatory product. Rest PETCO2 correlated with EDV (r=0.37, p 0.04), whilst rest O2 pulse correlated with SV (r=0.48, p 0.009) and ventricular mass (r=0.53, p 0.02). When determined for each functional class in the TCPC group there was no difference in EDV (p 0.75). Ventricular EF was different between NYHA Class: NYHA I (n=29) EF 64±8%, NYHA II (n=12) 55±7%, NYHA III (n=4) 63±7%, NYHA IV (n=1) 51%, P 0.005, but this did not represent a stepwise decline. In the AP group for each functional class there was no difference in EDV (p 0.1) or EF (p 0.6). The peak VO2 was different between functional classes for the TCPC and AP groups. The TCPC results were NYHA Class I 29±8; NYHA II 23±8; NYHA III 25±5; NYHA IV 11 p 0.03, whilst those for the AP group are NYHA I 25±7; NYHA II 19±7; NYHA III 16±5, (units ml/kg/min, p 0.006). Discussion This study demonstrates that no conventional cardiac remodelling parameters related to the patients functional capacity. Fontan patients may be disadvantaged when assessed for advanced heart failure strategies as ventricular EF is a poor marker of functional capacity in this cohort and a study assessing response based on exercise parameters may be warranted." @default.
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- W2738963630 date "2017-06-01" @default.
- W2738963630 modified "2023-09-23" @default.
- W2738963630 title "82 Relationship between cardiac structure and functional capacity in a fontan cohort" @default.
- W2738963630 doi "https://doi.org/10.1136/heartjnl-2017-311726.81" @default.
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