…cells. The resulting voltage gradient between normal and ischaemic myocardium generates currents of injury that are expressed on the surface ECG as ST segment displacement…

…glucose is reabsorbed by SGLT1 in the S3 segment. SGLT2 also mediates proximal tubular sodium reabsorption, with chloride following passively down the resulting electrochemical gradient…

…effect of the lesion. The apparent percentage stenosis is calculated relative to an adjacent reference segment presumed to be relatively normal. This assumption may be…

…2800 adults per 1 million individuals have congenital heart defects, and half of them have moderate or complicated defects; the remaining third have mild defects (…

…branch block, Wolff–Parkinson–White patterns or ventricular pacing STEMI and non ST segment elevation myocardial infarction (NSTEMI) are contemporary clinical and electrocardiographic categories. Earlier…

…ST segment to T wave is more abrupt in ischemia (the transition is normally smooth). Refer to Figure 2 . Figure 2. Transition from ST segment…

…Moreover, the ST segment may have a concave appearance if the T wave is prominent (such as in hyperkalemia, early repolarization or even early phases…

…to such ECG changes. It must also be noted that the J point is occasionally suboptimal for measuring ST segment deviation. This is explained by…

…and clinical applications of these modalities, the definitions of cardiac planes, ventricular segments, and coronary arterial territories evolved differently. This resulted in difficulties when comparing…

ECG Video lecture: The PR interval & PR segment This video lecture is accompanied by the detailed article The normal electrocardiogram (ECG). A brief summary of…

ECG Video lecture: The ST segment: J point, J 60 point, ST depression & ST elevation

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

…Therefore, the ST segment should be isoelectric, which means that it should be flat and on the same level as the baseline (recall that the…

…Sinus rhythm. Relatively large T waves in V2 V3, with ST segment elevations. Relative to the R waves, T waves are too large and pointed…

Myocardial ischemia and infarction Definition and pathophysiological context Non ST segment elevation myocardial infarction (NSTEMI) is considered within the spectrum of non ST elevation acute…

…fibrinogen depletion. Successful fibrinolysis is generally accompanied by relief of ischaemic symptoms, at least 50% resolution of ST segment elevation, and haemodynamic stability. Selection of…

…early and are commonly related to ventricular fibrillation. More than half of deaths attributable to ventricular fibrillation occur during the first hour, making rapid recognition…

ECG Introduction The traditional classification of acute coronary syndromes (ACS) into ST segment elevation myocardial infarction (STEMI), non STEMI (NSTEMI), and unstable angina (UA) has…

…endocardium to epicardium – in the myocardium affected by the occlusion. Transmural ischemia yields ST segment elevations on ECG. ST elevations are the hallmark of STEMI…

…V7, V8 and V9 in patients with high suspicion of posterior acute myocardial infarction (e.g due to reciprocal ST segment depressions in V1, V2…

…S wave, QRS complex, ST segment, T wave and QT interval This video is accompanied by the detailed article The normal electrocardiogram (ECG). A brief…

Cardiology Introduction Since its initial description in 1992 as a syndrome of right bundle branch block, ST segment elevation, and sudden cardiac death (SCD), Brugada…

…symptoms. 4. Blood pressure every second minute and on symptoms. 5. Ask actively about chest pain, breathlessness and leg fatigue; have the patient rate exertion

…Criteria for ST Elevation Myocardial Infarction (STEMI) The diagnosis of STEMI relies on specific electrocardiographic thresholds for ST segment elevation measured at the J point…

…intracavitary clot attached to the LV endocardium, typically overlying an akinetic or dyskinetic myocardial segment after myocardial infarction (MI). It is particularly associated with extensive…

…limiting epicardial coronary stenosis. It is therefore a disorder of coronary microvascular perfusion rather than persistent obstruction of the treated epicardial segment. The phenomenon occurs…

…compression, exacerbating myocardial injury. Clinical Presentation and Symptoms In up to one half of STEMI cases, a precipitating factor such as vigorous physical exercise, emotional…

…from the ST segment to the T wave should be smooth. The T wave is normally slightly asymmetric since its downslope (second half) is steeper…

…The clinical spectrum includes unstable angina, non ST segment elevation myocardial infarction (NSTEMI), and ST segment elevation myocardial infarction (STEMI). The traditional term “vulnerable plaque…

…or catheterization laboratory. A 12 lead ECG must be obtained immediately after ROSC in order to identify cases with ST segment elevations, which demand urgent…

…well with the severity and extent of ischemia. In the setting of moderate ischemia, the myocardium becomes hypokinetic, meaning that the ischemic segments contract less

…1. Sinoatrial arrest. Also note the ST segment elevations (which in this case have no relation to the sinoatrial arrest). As discussed in Chapter 1…

…Heart rhythm The P wave The PR interval The QRS complex The ST segment The T wave The U wave The QT interval (QTc) Neonatal…

…Definition of aortic aneurysm Sinus of Valsalva 45 mm. Any other segment 40 mm in diameter. Thresholds for surgery Threshold for surgery Relevant patient category…

…Denmark, Netherlands and United Kingdom reported a novel ECG syndrome characterized by widespread ST segment depressions and an increased risk of sudden cardiac arrest. They…

…ischaemic electrocardiographic changes during rapid AF. ST segment depression or T wave inversion can occur without coronary artery disease. Proposed explanations in the source material…

…opposite aortic sinus. Pathophysiology Myocardial bridging During systole, contraction of the overlying myocardium compresses the tunnelled coronary segment, producing an apparent angiographic narrowing. The narrowing…

…also an alternative to invasive coronary angiography (ICA) for excluding non ST segment elevation acute coronary syndrome (NSTE ACS) in patients with a low to…

…in the general ACS population. Clinical context and patient selection Acute coronary syndrome ACS includes ST segment elevation myocardial infarction (STEMI), non ST elevation myocardial…

…of patients, while clinically evident restenosis, manifested by recurrent angina attributable to the treated segment, occurred in 10–15% during the first year. The dominant…

…symptoms Heart rate and blood pressure responses to exercise Detection of exercise induced arrhythmias Identification of exercise related ST segment changes Prognostic and risk stratification…

…BMS). Clinical ISR is generally defined by recurrent symptoms or ischaemic events attributable to renarrowing within the stented segment or at its margins. Angiographic restenosis…

…intervention: lesion preparation; selection of stent diameter and length; identification of the proximal and distal reference segments; assessment of stent expansion and apposition; recognition of…

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

…are: The morphology of the proximal cap. The length, trajectory and composition of the occluded segment, including calcium. The quality of the distal target vessel…

…with an adverse prognosis. In STEMI, approximately half of patients undergoing primary PCI have multivessel disease. In ACS complicated by cardiogenic shock, multivessel disease is…

…V7, V8 and V9 be connected to the patient, as these leads may reveal the ST segment elevations on the back. In clinical practice, this…

…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…

…is constructed by superimposing the lead axes of the six frontal plane limb leads, dividing the plane into 12 segments, each subtending 30 degrees [3]…

…the same symptoms and events. Perhaps the most distinguishing feature was the characteristic ST segment elevations in leads V1–V3. Prevalence and genetics of Brugada…

…acronym for ST Elevation Acute Coronary Syndrome . All acute coronary syndromes that exhibit significant ST segment elevations on ECG are classified as STE ACS. Moreover…

…segment depressions with curved ST segment (generalized implies that the depressions may occur in most ECG leads). Refer to Figure 1 . Figure 1. ST segment…

…is prolonged. AV block occurs occasionally. QRS complex QRS duration is prolonged. ST segment No effect. T wave No effect. U wave No effect. QT…

…Increased QRS amplitude. Diminished T wave amplitude Osborn like waves. ST segment elevation in leads V1–V2. All degrees of AV block. Sinus node dysfunction…

…displays ST segment elevations. However, there are a few characteristic ECG syndromes (e.g. Wellen's syndrome, de Winter's sign, widespread ST segment depressions…

…In patients with STEMI, ST segment elevations and pathological Q waves occur in the same leads, which is why pathological Q waves can be used…

…the disease. Approximately 12% die within 30 days, compared to the 30 day mortality of STEMI (ST segment elevation infarction) , which is about 6%. Previously…

…The COACT, PEARL and TOMAHAWK trials studied patients with ROSC who did not display ST segment elevations and randomized them to urgent angiography. These trials…

…in echocardiography. The 17 segment model of the left ventricle serves as a standardized framework for identifying and localizing areas of ischemia or infarction. This…

…in chronological order: Heart rate Rhythm P wave PR interval QRS complex ST segment T wave U wave QT (QTc) interval Pediatric and neonatal electrocardiograms…