…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…

…ST segment elevations in at least two anatomically contiguous leads: • Men age ≥40 years: ≥2 mm in V2 V3 and ≥1 mm in all other…

…inflammation and other systemic influences. The severity of myocardial injury is determined not only by the epicardial obstruction but also by the vulnerability of the…

…<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…

…mass and 5 apical segments, constituting 30% of myocardial mass. The 17 segment model provides the best agreement with anatomic data, as compared with other…

…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…

…discordant ST T segment and the rhythm is regular (in most cases). Idioventricular rhythm starts and terminates gradually. It occurs in other situations than does…

…proportion of painless or silent STEMIs is greater in patients with diabetes mellitus and increases with age. STEMI may present as sudden onset breathlessness. Other…

…imbalance between myocardial oxygen supply and demand. In many cases, the initiating process is plaque disruption with thrombosis; other cases result from spasm, microvascular dysfunction…

…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…

…and imaging technique. Coronary fistulae represent abnormal communications between a coronary artery and a cardiac chamber or vessel. Other congenital anomalies include anomalous origin of…

…from selected populations, frequently with low or intermediate ischemic risk and under representation of patients with STEMI or other very high risk features. Noninferiority studies…

…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…

…resolution does not consistently permit identification of foamy macrophages. The occurrence of neoatherosclerosis helps explain why ISR and other stent related events may arise well…

…and length; identification of the proximal and distal reference segments; assessment of stent expansion and apposition; recognition of edge dissection, tissue prolapse, thrombus, or other…

…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…

…depression). As mentioned above there are numerous other conditions that affect the ST T segment and it is fundamental to be able to differentiate these…

…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…

…definition of MI. Type 1 MI is generally related to an atherothrombotic event, whereas Types 2–5 MI have other mechanisms of myocardial ischaemia 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…

ECG Myocardial ischemia and infarction Myocardial ischemia: cellular changes, ECG signs and development of infarction Like all other cells in the human body, cardiac myocytes…

…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…

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

…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…

…itself. It may cause symptoms and impaired quality of life, contribute to heart failure, and increase the risk of stroke and other thromboembolic events. Subclinical…

…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…

…of atrial fibrillation in patients without structural heart disease (reduced left ventricular function is considered a structural heart disease). AVNRT, AVRT (WPW syndrome) and other…

…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…

…in other leads (particularly V5) and that is not consistent with posterior transmural ischemia. To conclude, patients with chest discomfort who display ST segment depressions…

…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…