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Sinus tachycardia & Inappropriate sinus tachycardia

…and nervousness. This is due to altered tone in the autonomic nervous system, with increased sympathetic input (leading to stimulation of beta adrenergic receptors) and…

Causes of sudden cardiac arrest

…autonomous nervous system, electrolyte concentrations, and other factors (potentially also genetic predisposition) interact to trigger ventricular tachycardia or ventricular fibrillation. These factors interact and vary…

Cardiac thromboembolism: cardiac sources of embolism

…Ischemic heart disease Both acute and chronic ischemic heart disease (including complications) can cause embolisms. Left ventricular aneurysm with thrombus Cardiomyopathies Valve prosthesis Devices (pacemaker…

The electrical axis of the heart (heart axis): ECG & physiology

…depolarization (and thus the electrical axis) is generally alongside the hearts longitudinal axis (to the left and downwards). Figure 38 shows the coordinate system where…

The electrical axis of the heart (ECG axis)

…depolarization (and thus the electrical axis) is generally alongside the heart's longitudinal axis (to the left and downwards). Figure 38 shows the coordinate system…

Anticoagulation Strategies in Atrial Fibrillation

…common sustained cardiac arrhythmia and a profound driver of global cardiovascular morbidity and mortality, primarily due to its association with ischemic stroke and systemic embolism…

Right ventricular strain: definition, causes, echocardiography

…pulmonary embolism, pulmonary hypertension, septum defects, etc. Right ventricular load is thus an issue that is raised both in outpatient and emergency care. To evaluate…

Type 2 Myocardial Infarction: Mechanisms and Management

…crucial to distinguish Type 2 MI from acute and chronic myocardial injury. Myocardial injury is characterised by myocyte necrosis and troponin elevation due to mechanisms…

Atrial fibrillation: ECG, classification, causes, risk factors & management

…is too often discovered first at hospital admission due to its complications (stroke, thromboembolism, heart failure, dyspnea). Most individuals, however, do experience symptoms and th

Indications, Contraindications, and Preparations for Exercise Stress Testing

…circulatory collapse and arrhythmias Pulmonary embolism in acute phase – due to risk of aggravation of the condition. Pulmonary infarction in acute phase – due to risk…

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