…EPS), and the transition from a purely device based management strategy (implantable cardioverter defibrillators) to one that incorporates pharmacological and interventional (substrate ablation) therapies [5] …

…permanent pacemakers, implantable cardioverter defibrillators (ICDs), and cardiac resynchronization therapy (CRT) devices. Implantable loop recorders are diagnostic devices rather than pacing or defibrillation systems, but…

…term prediction of sudden cardiac arrest. The constraint does not lie in therapy: implantable cardioverter defibrillators (ICDs) are highly effective, terminating well over 99% of…

…devices. This section is devoted to artificial pacemakers. More advanced devices (ICD, implantable cardioverter defibrillator; CRT, cardiac resynchronization therapy) are discussed in subsequent chapters. The…

…skull fracture or marked coagulopathy argues against the nasal route; the oral route may then be considered. Preparation and equipment A 12 lead ECG machine…

…be more efficient to present the limb leads in their anatomically contiguous manner; that is, from left superior basal to right inferior. In other words…

…ischemia. The term transmural ischemia implies that the ischemia affects all wall layers – from endocardium to epicardium – in the myocardium affected by the occlusion. Transmural…

…created by analyzing several electrodes. In other words, each ECG lead is computed by analyzing the electrical currents detected by several electrodes. The standard ECG …

…of cardiac arrest. Recurrent VT or VF after ROSC in a patient with a coronary risk profile should lead to consideration to perform early angiography.

…Fortunately, most children (even the youngest) can be distracted by a parent or other personnel. Distracting the child during ECG recording may be recommended to…

…deal in a conscious patient. Indications Immediate (transcutaneous) pacing in bradycardia with haemodynamic compromise — hypotension, shock, impaired consciousness, heart failure, myocardial ischaemia or syncope — that…

…2. Obtain a 12 lead ECG within 10 minutes. 3. Attach defibrillator pads if the patient is unstable or at marked risk of arrhythmia. 4…

…chloride is then usually the first choice, since it provides more elemental calcium per millilitre and can be given rapidly through secure intravenous or intraosseous…

…12 lead ECG should be interpreted immediately (within 10 minutes) at first medical contact. I B ECG monitoring should start immediately and a defibrillator must…

…WPW). Note that narrow complex tachyarrhythmia rarely causes circulatory compromise or collapse. Causes of tachycardia (tachyarrhythmia) with wide QRS complexes (QRS duration ≥0,12 s…

…Greater than or equal to 2 mm Women (any age) V2 to V3 Greater than or equal to 1.5 mm All patients Other leads…

…structure or composition of coronary atherosclerotic plaque, identify plaques at high risk of rupture, or determine whether ischaemia would occur at workloads greater than those…

…anterior leads, posterior infarction may manifest as reciprocal ST segment depression rather than apparent ST segment elevation. Posterior involvement is commonly associated with inferior or…

…2nd AV block, prolonged QT interval, and profound sinus bradycardia are typically considered abnormal or profound findings that may require further investigation. 2. What heart…

…association, whereas other conventional coronary risk factors may be absent. The condition is more prevalent in Japan and South Korea than in Western populations, and…

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

…be suspected if there is significant stenosis ( 75% luminal obstruction) of the left main coronary artery (LAD) or 2 epicardial coronary arteries (Felker et al)…

…therefore critical. The 12 lead electrocardiogram (ECG) is an immediately available diagnostic tool that can provide essential clues to LMCA occlusion or critical stenosis. This…

…the treatment. Commonly, patients with bradycardia have a strong indication for drugs that aggravate or cause bradycardia (e.g. beta blockers in heart failure). In…

…of the sinoatrial node or block the impulse from reaching the atria. Disturbed automaticity and blocked impulses lead to arrhythmias that characterize sinus node dysfunction…

…lead appears very disorganized, there are visible QRS complexes. The signal in the lower lead shows that the rhythm is a polymorphic ventricular tachycardia (or…

…pulseless electrical activity (PEA). These are highly lethal arrhythmias that lead to death if cardiopulmonary resuscitation is not started immediately. Ventricular fibrillation is the result…

…wave is positive in lead II. Causes of bradyarrhythmia: sinus bradycardia, SA block, sinus arrest, sick sinus syndrome, second degree or third degree AV block…

…women ≥ 1.5 mm Other leads ≥ 1.0 mm V7–V9 (posterior) ≥ 0.5 mm V3R–V4R (right ventricle) ≥ 0.5 mm (≥ 1.0 mm…

…R is taller than R', ventricular tachycardia is suggested. Triphasic complexes (rSr’, rsr’, rSR’, rsR’) suggests SVT V6 : rS, QS, R or Rs complex suggests…

…induce severe hypotension. • Clonidine is not recommended in most patients with severe cardiovascular disease or in those who are otherwise haemodynamically unstable. The benefit of…

…anemia associated with neurological findings, renal failure, or fever. It's a potentially fatal condition that requires prompt treatment, including plasmapheresis. Interference with Platelet Function…

…They identified five unrelated families with features that represent a previously unrecognized autosomal dominant syndrome (4). Figure 1 . 12 lead ECG (presented according to Cabrera…

…Higher doses are more effective than lower doses in preventing hospitalization. Abrupt withdrawal of treatment with an ACE inhibitor may lead to clinical deterioration and…

…agree with those viewpoints. Going through some guidelines the other day I realized that they are indeed becoming thicker and thicker. Guidelines issued by AHA…

…wave throughout. Figure 2 (above) does not show that the P wave in lead II might actually be slightly asymmetric by having two humps. This…

…NSTE ACS/NSTEMI are almost invariably accompanied by ST segment depressions in other leads (particularly V5) and that is not consistent with posterior transmural ischemia…

…assigns 2 points for left axis deviation that is greater than or equal to 30 degrees [11]. Additionally, LAD may suggest underlying left heart disease…

…aVF (with QRS duration <0.12 seconds), provided that other causes of right axis deviation have been excluded. Causes of left axis deviation Left bundle…

…aVF (with QRS duration <0.12 seconds), provided that other causes of right axis deviation have been excluded. Causes of left axis deviation Left bundle…

…inversions are symmetric with varying depth. They may be gigantic (10 mm or more) or less than 1 mm. Negative U waves my occur when…

…compliance. Increasing diastolic volumes requires that the myocardium becomes hypertrophic. Dilation and hypertrophy allow the ventricle to maintain cardiac output and prevent, or alleviate, the…

…with chest pain (chest discomfort) or other symptoms suggestive of the five conditions listed above. It is important that history taking and physical examination is…

…a stimulus that is expected to result in activation fails to do so. This may be due to insufficient stimulus energy, or lead dislodgement/fracture…

…P wave will be visible, either before or after the QRS complex. In either case it will be retrograde (in lead II, III and aVF)…

…or the right ventricle. Such systems are referred to as single chamber systems . Nowadays, most implanted pacemakers are dual chamber systems , meaning that two leads…

…performed on all patients seeking medical attention due to chest discomfort or other symptoms that may be caused by myocardial ischemia. Other symptoms include dyspnea…

…a screw that is inserted into the myocardium, or passive , meaning that the cathode is not inserted into the myocardium but instead the lead is…

…altered ion channel function leads to regional dispersion in the refractoriness. This means that some myocardial regions will be refractory while others will be excitable…

…as it shows the coronary arteries and their relation to the ECG leads. Note that Figure 1 is a right dominant system (i.e PDA…

…Q wave infarction) Lead Definition of pathological Q wave Normal variants V2–V3 ≥0,02 s or QS complex None All other leads ≥0,03…

…hypertension, valvular disease or congenital heart disease. Cardiomyopathy leads to impaired cardiac function and heart failure. There are six main types of cardiomyopathy: Hypertrophic cardiomyopathy…

…to another (in the same lead). This is due to the swinging back and forth of the heart in the pericardial space. Note that tachycardia…

…common agent. These streptococci most often originate from the oral cavity and affect heart valves that have some kind of damage, change or degeneration. Endocarditis…

…ischemic zone. Newly formed vessels, which may originate from other branches of the same coronary artery or another coronary artery, will alleviate the ischemia, improve…

…WPW). Note that narrow complex tachyarrhythmia rarely causes circulatory compromise or collapse. Causes of tachycardia (tachyarrhythmia) with wide QRS complexes (QRS duration ≥0,12 s…

…both conditions. Reverse redistribution : A less common pattern where defects appear worse at rest than during stress, potentially indicating microvascular dysfunction or other pathologies. The…

…Moreover, the P wave may be slightly biphasic (diphasic) in lead V1, implying that the terminal part of the P wave is negative (Figure 1…

…QRS duration ≥0,12 seconds. Leads V1 V2: deep and broad S wave. The small r wave is missing or smaller than normal; if missing…

…an intuitive basis. Consider the fact that the left ventricle contracts and ejects blood into the aorta roughly 100,000 times daily, each time overcoming…