…used in therapeutic studies of pulmonary arterial hypertension (PAH). The threshold is not absolute: patient phenotype, risk factors for heart failure with preserved ejection fraction…

ECG Introduction to ECG interpretation The QRS complex (ventricular complex): normal and abnormal configurations and intervals A complete QRS complex consists of a Q , R…

…impulses generated in the ventricles will result in wide QRS complexes because the impulse will spread entirely or partly outside of the conduction system (which…

Cardiology Interpreting myocardial perfusion SPECT images involves a systematic comparison of rest and stress images to assess myocardial ischemia and infarction. The key steps in…

…to the QRS morphology during LBBB. Stimulation in other regions of the ventricle may result in a different QRS morphology. If the lead tip is…

…events in the setting of a stent thrombosis or restenosis. Type 1 myocardial infarction Definition and pathophysiology Type 1 MI results from acute coronary atherothrombosis…

…The regurgitation results in blood flowing back from the pulmonary artery into the right ventricle during diastole. The most common cause of abnormal pulmonary regurgitation…

…women, respectively, should be considered abnormal. A common cause of abnormally large T waves is hyperkalemia, which results in high, pointed and asymmetric T waves…

…platelets and coagulation factors, which results in thrombus formation (Figure 1). Disruption of an atherosclerotic plaque may also release atherosclerotic debris downstream, causing microvascular embolization…

…in the myocardium. The electrical potential difference exists between ischemic and normal myocardium and it results in displacement of the ST segment. The ST segment…