…an adjacent reference segment presumed to be relatively normal. This assumption may be incorrect when atherosclerosis is diffuse, leading to underestimation of the overall disease…

…arterial connection and the relationship of the great arteries (segmental analysis). Ventricular function is evaluated using ejection fraction, fractional shortening, stroke volume, and myocardial thickness…

…Such ST segment elevations are extremely common in all populations. They occur in young, old, healthy and diseased individuals. For example, roughly 90% of males…

…only by the epicardial obstruction but also by the vulnerability of the myocardium and coronary microcirculation. Endothelial dysfunction promotes leukocyte and platelet activation and interaction…

…<1 mm and it resolves rapidly once the exercise is stopped. Some experts believe that these ST segment depressions represent a benign form of subendocardial…

…view (A2C) Horizontal long axis Apical four chamber view (A4C) Segments of the left ventricle Based on anatomical landmarks and autopsy studies (Edwards et al)…

…is generally accompanied by relief of ischaemic symptoms, at least 50% resolution of ST segment elevation, and haemodynamic stability. Selection of the reperfusion strategy Primary…

…probability of unstable angina (UA), and patients whose initial findings are less definitive. The defining electrocardiographic feature is the absence of persistent ST segment elevation…

…The transition from the ST segment to the T wave is smooth, as is the transition between phases 2 and 3 of the action potential …

…interval and PR segment The P wave ECG interpretation usually starts with assessment of the P wave. The P wave is a small, positive and…

…and infarction Definition and Pathophysiology ST segment elevation myocardial infarction (STEMI) is an acute myocardial infarction associated with a working diagnosis of persistent ST segment…

…after reperfusion in an occluded coronary artery. It also occurs as side effect of drugs, hypoxia, myocarditis and electrolyte disorders. Because the rate (60–100…

…coronary microvascular dysfunction, also contributes to the extension and severity of ischemic injury. In its most severe form, known as no reflow, structural and functional…

…activation and coagulation, with formation of an intraluminal thrombus. The clinical spectrum includes unstable angina, non ST segment elevation myocardial infarction (NSTEMI), and ST segment…

…Method of interpretation Heart rate Heart rhythm The P wave The PR interval The QRS complex The ST segment The T wave The U wave…

…obstruction. Assessment should include: Confirmation that the treated epicardial segment is adequately expanded and not severely obstructed. Exclusion of coronary dissection compromising the true lumen…

…Brugada syndrome. This disorder is easy to diagnose with a simple blood test and the ST segment elevations resolve after normalization of potassium levels. Brugada…

…to dysfunction in the conduction system. The J point and the ST segment The ST segment corresponds to the plateau phase (phase 2) of the…

…sinus node dysfunction, side effects of medications and acute myocardial infarction. Holter ECG is useful to determine the frequency, severity and situational dependence of sinus…

…pre excitation (presence of an accessory pathway). This is associated with a delta wave. For further details on the PR interval and the PR segment…

…However, intravascular ultrasound has shown that delayed opening of the bridged segment may extend into diastole, so the physiological effect is not limited to systole…

…and cardiac troponin findings. The default treatment after ACS, whether or not PCI is performed, is 12 months of DAPT unless there is a contraindication…

…low as 0.4–0.5% at 1 year and below 1% at 5 years. Stent thrombosis remains clinically important because interruption of antiplatelet therapy…

…stented segment rather than by negative remodelling. Pathophysiology Neointimal hyperplasia The principal mechanism of ISR is neointimal hyperplasia following vessel wall injury. PCI and stent…

…preparation; selection of stent diameter and length; identification of the proximal and distal reference segments; assessment of stent expansion and apposition; recognition of edge dissection…

…length, trajectory and composition of the occluded segment, including calcium. The quality of the distal target vessel. The configuration and adequacy of collateral channels. Additional…

…material, promoting platelet activation, aggregation, and fibrin formation. Within a stented segment, thrombus may also develop because of disturbed flow, residual dissection, inadequate stent expansion…

…a more symmetrical T wave, a more distinct transition from ST segment to T wave and lower T wave amplitude. The T wave should be…

…ventricular hypertrophy, and to the left in left ventricular hypertrophy). ST T segment Significant hypertrophy may result in abnormal depolarization of the ventricular myocardium. This…

…Relapse of VF and new shock. ECG 12 . Sinus rhythm. ECG 13 . Ventricular tachycardia. ECG 14 . Sinus rhythm, with ST segment elevations not seen previously…

…Displacement of the ST segment is of fundamental importance, particularly in acute myocardial ischemia. Because myocardial ischemia affects a limited area and disturbs the cells…

…right sided chest leads and deeper S waves in left sided leads. Left ventricular hypertrophy (LVH) The most common causes of left ventricular hypertrophy are…

…Reproduction and characterization of symptoms Heart rate and blood pressure responses to exercise Detection of exercise induced arrhythmias Identification of exercise related ST segment changes…

…capacity, low affinity transporter situated in the S1 and S2 segments of the renal proximal tubule. It accounts for approximately 90% of renal glucose reabsorption…

…Myocardial motion and velocity can be measured with pulsed tissue Doppler (see Pulsed Wave Doppler). Tissue Doppler allows for sampling of specific regions or structures…

…segment elevation myocardial infarction; extensive vascular calcification; female sex; low body mass index; larger arterial sheaths; greater intensity of procedural anticoagulation; complex coronary anatomy and…

…non ST segment elevation acute coronary syndrome (NSTE ACS) in patients with a low to intermediate likelihood of CAD when cardiac troponin and/or the…

…scarred regions may alternate with viable segments that are dysfunctional because of repeated ischemic episodes or chronic reductions in perfusion. The amount and distribution of…

…done by using ECG changes to determine the affected area and subsequently the occluded coronary artery (culprit). Figure 1B. Detailed diagram of coronary artery segments…

…P wave PR interval QRS complex ST segment T wave U wave QT (QTc) interval Pediatric and neonatal electrocardiograms differ markedly – in terms of rhythm…

…segments are twisted clockwise, and the apex is twisted counterclockwise. The twisting contraction is called circumferential shortening (Figure 2C). Figure 2A 2C. The orientation of…

…one third of patients may have severe fixed coronary obstruction. Such patients can have a mixed syndrome, with exertional angina and ST segment depression related…

…of NSTEMI and UA may be similar. NSTEMI is diagnosed when typical ischaemic symptoms occur without persistent ST segment elevation, accompanied by a rise and…

…sharp or stabbing. Its location and radiation may reflect the segment of aorta involved, although the source material does not provide a detailed symptom to…

…low output, or persistent severe symptoms require close monitoring and consideration of invasive haemodynamic assessment when precise measurements are needed to guide therapy. Diagnostics Electrocardiography…

…hypertrophy, LV dysfunction, or other pathology that could affect the safety or interpretation of the examination. Evaluation and Physical Examination Before stress echocardiography, clinical assessment…

…balanced and no ischemia occurs. (Some individuals display a benign form of ischemia located in the subendocardium during exercise; this manifests with ST segment depressions…

…For example, if there is acute ischemia located in the anterior wall and there is ST segment elevation in lead V3, then there should also…

…leads [7]. These stricter parameters correlate more closely with abnormal LV mechanical function and the potential benefit of resynchronization pacemaker therapy [7]. R Wave Peak…

…analytical sensitivity improves diagnostic accuracy and negative predictive value in patients with suspected acute coronary syndrome (ACS). Cardiac troponin is a marker of myocardial injury…

…situations, sinus arrest/pause should be considered abnormal, and the following differential diagnoses are at hand: Sinus node dysfunction. Side effects of drugs (diltiazem, verapamil…

…male patient, with similar ST segment changes, experienced syncopal episodes, ventricular tachycardia (including torsades des pointes), ventricular fibrillation arrests and moderate left ventricular dysfunction. This…

…instability. Evaluation and physical examination Initial assessment should establish whether AF is associated with acute haemodynamic compromise, pulmonary oedema, or evidence of coronary ischaemia. These…

…inotropic effect and a negative chronotropic effect, enhancing ventricular contractility while lowering heart rate. The positive inotropic effect is due to the inhibition of the…

…heart rhythm and conduction Effect on sinoatrial (SA) node SA node function may become worse in patients with established SA node disease (sinus node dysfunction…

…ST segment elevation in leads V1–V2. All degrees of AV block. Sinus node dysfunction and tach brady syndrome. Ventricular tachycardia, ventricular fibrillation and torsade…

…excitation leads to abnormal depolarization of the ventricles and this leads to abnormal repolarization as well. The ST T segment is directed oppositely to the…

…left ventricular dysfunction, peripheral vascular disease and other manifestations of diffuse atherosclerosis. Percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) are revascularization procedures…

…display ST segment elevations during posterior (posterolateral) transmural ischemia. On the other hand, leads V1–V3 (occasionally V4) may detect the injury currents and present…

…discharged in the ventricles it will spread partly or entirely outside of the conduction system and thus produce a wide QRS complex (QRS duration ≥0…