1. Systolic blood pressure ≤110 mm Hg is associated with severe coronary microvascular ischemia and higher risk for ventricular arrhythmias in hypertrophic cardiomyopathy.
- Author
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Lu, Dai-Yin, Lu, Dai-Yin, Yalcin, Hulya, Yalcin, Fatih, Sivalokanathan, Sanjay, Greenland, Gabriela, Ventoulis, Ioannis, Vakrou, Styliani, Pampaloni, Miguel, Zimmerman, Stefan, Valenta, Ines, Schindler, Thomas, Abraham, Theodore, Abraham, M, Lu, Dai-Yin, Lu, Dai-Yin, Yalcin, Hulya, Yalcin, Fatih, Sivalokanathan, Sanjay, Greenland, Gabriela, Ventoulis, Ioannis, Vakrou, Styliani, Pampaloni, Miguel, Zimmerman, Stefan, Valenta, Ines, Schindler, Thomas, Abraham, Theodore, and Abraham, M
- Abstract
BACKGROUND: Coronary microvascular dysfunction (CMD) and hypertension (HTN) occur frequently in hypertrophic cardiomyopathy (HCM), but whether blood pressure (BP) influences CMD and outcomes is unknown. OBJECTIVE: The purpose of this study was to test the hypothesis that HTN is associated with worse CMD and outcomes. METHODS: This retrospective study included 690 HCM patients. All patients underwent cardiac magnetic resonance imaging, echocardiography, and rhythm monitoring; 127 patients also underwent rest/vasodilator stress 13NH3 positron emission tomography myocardial perfusion imaging. Patients were divided into 3 groups based on their rest systolic blood pressure (SBP) (group 1 ≤110 mm Hg; group 2 111-140; group 3 >140 mm Hg) and were followed for development of ventricular tachycardia (VT)/ventricular fibrillation (VF), heart failure (HF), death, and composite outcome. RESULTS: Group 1 patients had the lowest age and left ventricular (LV) mass but the highest prevalence of nonobstructive hemodynamics and restrictive diastolic filling. LV scar was similar in the 3 groups. Group 1 had the lowest rest and stress myocardial blood flow (MBF) and highest SDS (summed difference score). Rest SBP was positively correlated with stress MBF and negatively correlated with SDS. Group 1 had the highest incidence of VT/VF, whereas the incidences of HF, death, and composite outcome were similar among the 3 groups. In multivariate analysis, rest SBP ≤110 mm Hg was independently associated with VT/VF (hazard ratio 2.6; 95% confidence interval 1.0-6.7; P = .04). CONCLUSION: SBP ≤110 mm Hg is associated with greater severity of CMD and coronary microvascular ischemia and higher incidence of ventricular arrhythmias in HCM.
- Published
- 2023