LBBB and High Afterload
نویسندگان
چکیده
منابع مشابه
Afterload Mismatch and Preload Reserve
We examined the interrelationship of afterload, preload and left ventricular (LV) performance at two levels of systolic loading in 20 patients with chronic aortic regurgitation to determine if the concept of afterload mismatch and preload reserve can be applied to this clinical entity. We identified two groups of patients at different stages in the natural history of volume overload. Patients i...
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Background Systolic circumferential and longitudinal strain(CSt%, LSt %) are widely used to assess myocardial performance, but their afterload dependence has not been well characterized. Using geometric estimates of left ventricular (LV) circumferential and meridional wall stress(CWS, MWS) as indices of afterload at the myocardial level, we compared LV CSt and LSt to estimates of CWS and MWS in...
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►Implication for health policy/practice/research/medical education: This report demonstrates new criteria for patient selection in CRT era. We started diagnosing Bundle Branch Block about 100 years ago on dog models (1). However, about 40 years passed until we could diagnose Left Bundle Branch Block (LBBB) correctly on ECG (2). Today, we have conventional criteria for diagnosing LBBB, including...
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We examined the effects of graded reduction of afterload on the global left ventricular and regional myocardial functions as well as coronary hemodynamics in hearts with regional ischemia. We used isolated, paced canine hearts that were loaded with a hydraulic system that simulated the aortic input impedance of the dog's arterial tree. The loading conditions could be quantitatively and sequenti...
متن کاملQuantification of interventricular asynchrony during LBBB and ventricular pacing.
The quantification of mechanical interventricular asynchrony (IVA) was investigated. In 12 dogs left bundle branch block (LBBB) was induced by radio frequency ablation. Left ventricular (LV) and right ventricular (RV) pressures were recorded before and after induction of LBBB and during LBBB + LV apex pacing at different atrioventricular (AV) delays. Four IVA measures were validated using compu...
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ژورنال
عنوان ژورنال: JACC: Cardiovascular Imaging
سال: 2019
ISSN: 1936-878X
DOI: 10.1016/j.jcmg.2017.12.002