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Prominent R wave in ECG lead V1 predicts improvement of left ventricular ejection fraction after cardiac resynchronization therapy in patients with or without left bundle branch block

Heart FailureDevice TherapyCardiovascular DiseaseCardiac MechanicCardiac Resynchronization TherapyElectrophysiologyProminent R WaveCardiac ArrestPublic HealthMedicineCardiologyDiastolic FunctionEmergency MedicineAnesthesiologyCardiovascular Imaging