Clinical meaning
Long QT Syndrome involves specific alterations in long qt syndrome physiology. The pathophysiology of Long QT Syndrome encompasses changes in myocardial contractility, cardiac conduction, vascular resistance, endothelial function, or structural integrity depending on the primary mechanism involved. Key cellular processes include ion channel dysfunction, inflammatory mediator activation, oxidative stress, fibrotic remodeling, and neurohormonal dysregulation that drive the clinical manifestations of long qt syndrome.
Diagnosis & workup
Diagnostics & workup: - Lipid panel: total cholesterol, LDL, HDL, triglycerides - Ambulatory blood pressure monitoring for white coat vs masked HTN - TEE for valvular vegetation, intracardiac thrombus, PFO assessment - Thyroid function tests (hyperthyroidism causes high-output states) - Echocardiography: EF, wall motion, valvular function, chamber dimensions - Ankle-brachial index for peripheral vascular disease screening - HbA1c for glycemic control assessment in diabetic patients
Risk factors: - Family history of premature CVD (<55 males, <65 females) - Hypercoagulable states (Factor V Leiden, antiphospholipid) - Peripheral artery disease (ABI <0.9) - Cocaine or amphetamine use causing coronary vasospasm - Age >65 with cardiovascular degeneration - Sedentary lifestyle with deconditioning - History of preeclampsia or gestational hypertension