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- W2026163631 abstract "Assessment of fluctuations in heart rate (HR) following a premature ventricular complex (PVC) is valuable for identifying patients at high risk of sudden cardiac death. We hypothesised that postextrasystolic potentiation is the main determinant of the regulation patterns of blood pressure (BP) and HR following a PVC. Twelve patients with idiopathic dilated cardiomyopathy (IDC) and 13 control subjects with single PVCs (comparable coupling intervals) were investigated. Non‐invasive finger arterial BP and ECGs were analysed. Regulation patterns following a single PVC were quantified using the indices postextrasystolic amplitude potentiation (PEAP) and maximum turbulence slope of five consecutive mean BP values (MBP‐TS), and compared with the HR turbulence parameters turbulence slope (HR‐TS) and turbulence onset (HR‐TO). PEAP was significantly higher in IDC patients compared to controls (48.7 ± 32.6 vs . 9.8 ± 5.4 %, P < 0.01), whereas MBP‐TS was lower (0.97 ± 0.60 vs . 2.07 ± 1.04 mmHg BBI −1 (BBI, beat‐to‐beat interval), P < 0.05), as was HR‐TS (8.46 ± 7.90 vs . 30.73 ± 22.90 ms BBI −1 , P < 0.01). HR‐TO was significantly higher in IDC patients (−0.56 ± 2.19 vs .−5.52 ± 4.13 %, P < 0.01). In addition, the regulation patterns of BP and HR following a single PVC differed significantly between IDC patients and controls. Specifically, we observed pronounced PEAPs in IDC patients. The baroreflex response initiated by the low pressure amplitude of the PVC was suppressed in IDC patients due to the augmented potentiation of the first postextrasystolic blood pressure. Furthermore, IDC patients displayed impressive postextrasystolic pulsus alternans phenomena, whereas healthy subjects exhibited a typical baroreflex pattern. The pulsus alternans phenomenon seems to be triggered by a PVC." @default.
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- W2026163631 date "2002-01-01" @default.
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- W2026163631 title "Postextrasystolic regulation patterns of blood pressure and heart rate in patients with idiopathic dilated cardiomyopathy" @default.
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- W2026163631 doi "https://doi.org/10.1113/jphysiol.2001.013044" @default.
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