…Transcutaneous pacing takes seconds to start and can keep a patient alive until a transvenous lead is in place — but only if it is working…

…Older pacemakers generate large and visible spikes, whereas newer models may generate very minute or even invisible spikes (at least in some leads). Pacemaker stimulated…

…Such systems are referred to as single chamber systems . Nowadays, most implanted pacemakers are dual chamber systems , meaning that two leads are used: one in…

…the myocardium but instead the lead is anchored to the myocardium via tines (Figure 1). Unipolar vs. bipolar pacing Pacemakers can utilize either a unipolar…

…waves. Undersensing may lead to overpacing . Failure to rate adjust, which means that the pacemaker fails to adjust its rate according to haemodynamic needs. This…

…inhibit the pacemaker. P waves The appearance of the P wave depends on where the atrial lead is fixed. Typically, the atrial lead is fixed…

ECG The artificial pacemaker is one of the great medical inventions of the 20th century. Cardiac pacing has evolved from a hazardous experiment in the…

…P waves with constant morphology preceding every QRS complex. P wave is positive in limb lead II. Normal (physiological) causes of sinus bradycardia Sinus bradycardia…

…is the same. The sinoatrial (SA) node is the heart’s pacemaker under normal circumstances and the rhythm is referred to as sinus rhythm . Hence…

…for the immune system to reach the bacteria. Endocarditis can lead to the destruction of the valvular apparatus, as well as to embolization in the…

…artificial pacemaker to reduce symptoms and increase function. However, it should be noted that any bradycardia originating in the sinoatrial node is unlikely to lead…

…P wave precedes every QRS complex; the PR interval is constant and the P wave is positive in lead II. Causes of bradyarrhythmia: sinus bradycardia…

…in stable angina. Exercise induced arrhythmia or exercise induced syncope. Assessment of chronotropic function and pacemaker settings. Preoperative functional assessment before major surgery. At a…

…where relevant, whether leads are unipolar or bipolar. Implantation history and current indication. Device function and battery status. Whether the patient is pacemaker dependent. Whether…

…escape rhythm awakes. It is uncommon that sinus arrest leads to persistent asystole; latent pacemakers virtually always awake and salvage the rhythm. Adam Stokes attack…

…FREQUENT ECTOPY Premature ventricular contractions (PVC) Premature atrial contractions (PAC) PACEMAKER RELATED Pacing with rapid ventricular response rate The incidence of tachycardia induced cardiomyopathy is…

…renal disease and secondary hypertension, and lead to one dose being moved to the evening. The fall can only be calculated if the diary states…

…cardiac embryogenesis, are capable of exhibiting markedly increased automaticity, thereby serving as ectopic pacemaker foci. The term “ectopic” is often omitted in clinical practice, and…

…is the same. The sinoatrial (SA) node is the heart’s pacemaker under normal circumstances and the rhythm is referred to as sinus rhythm. Hence…

…be considered. For example, Wolff Parkinson White syndrome (WPW), pacemaker stimulated beats, electrolyte imbalance and medications may prolong the QRS complex. References Aro AL, Anttonen…

…Baseline ECG abnormalities rendering ST T interpretation difficult, including left bundle branch block (LBBB) or pacemaker rhythms. Atrial fibrillation or atrial flutter Patients on medications…

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

…arrest, it is essential to reconfirm the rhythm in two leads if possible to distinguish true bradyarrhythmic or asystolic arrest from other tachyarrhythmic events. On…

…should lead to suspicion of ischemia (if the patient has symptoms consistent with ischemia). The same is true for artificial pacemakers (virtually all pacemakers stimula

…depolarization (i.e they display automaticity) and can therefore act as latent pacemakers (which become active when atrial impulses do not reach the atrioventricular node…

…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…

…segment elevations on ECG There are two situations in which transmural ischemia does not present with ST segment elevations on the conventional 12 lead ECG…

…electrical currents. An ECG lead is a graphical description of the electrical activity of the heart and it is created by analyzing several electrodes. In…

…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.

…chest (precordial) electrodes are not changed but additional leads may be attached in children under the age of 5 years. These additional leads are V3R…

…begins in parallel with the diagnostic work up. Obtain an interpretable 12 lead ECG within 10 minutes of first medical contact, attach continuous rhythm monitoring…

…not exclude dangerous hyperkalaemia. Record a 12 lead ECG and start cardiac monitoring at a plasma potassium above 6.0 mmol/L, and at lower…

…1 Initial diagnosis of STEMI ECG Management Recommendation Level of evidence A 12 lead ECG should be interpreted immediately (within 10 minutes) at first medical…

…atrial rate (beats/min)? P waves should precede every QRS complex and the P wave should be positive in lead II. Common findings Sinus rhythm …

…versus high risk (red) ECG morphs in lead aVL (adapted from Obermeyer et al 1 ). Representative single beat morphs for a low risk patient (blue…

…positive hyperacute T waves [15]. Profound ST elevation across multiple leads generally indicates very severe ischemia [15]. A key distinguishing feature of ischemic ST elevation…

…usually on a treadmill, while symptoms, a 12 lead ECG, heart rate and blood pressure are monitored. The test is generally symptom limited and is…

…the surface ECG as ST segment displacement. When the ischaemic vector is directed away from the standard anterior leads, posterior infarction may manifest as reciprocal…

…for females) C: Incomplete Right Bundle Branch Block (rSR' pattern in lead V1 and qRS pattern in V6 with QRS duration <120 ms) D: Profound…

…spasm produces a reversible functional occlusion and usually causes transmural ischaemia. The resulting abnormalities in left ventricular function may lead to myocardial infarction, ventricular tachycardia…

…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…

…diabetic cardiomyopathy, etc. ) may ultimately lead to ventricular dilation. However, the term dilated cardiomyopathy (DCM) refers to idiopathic or genetic dilation of the left ventricle…

…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…

…evident, ventricular tachycardia may appear more polymorphic in one lead (the upper lead). ECG 2 . Although the signal in the upper lead appears very disorganized…

…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…

…9 mmol/L, and consider telemetry. The QT interval is measured in the lead in which it is longest, usually II or V5, and the…

…complex. Brugada's algorithm If there is no RS complex in any chest lead (V1–V6) a diagnosis of ventricular tachycardia can be made. Otherwise…

…administration in these patients should be carefully balanced against the potential risks resulting from hypotension. • Withdrawal of clonidine may lead to rebound hypertension. Withdraw slowly…

…ritonavir, and atazanavir) can lead to a significant increase in exposure to ticagrelor. Dosage: Acute Coronary Syndromes Treatment with Ticagrelor should start with a loading…

…male patient (Figure 1) presented at age 36 years with an ECG showing deep and persistent, concave upward ST segment depression in leads I, II…

…Furthermore, because ACE inhibitors also inhibit kininase II, they may lead to the upregulation of bradykinin, which further enhances the effects of angiotensin suppression. In…

…Nevertheless, I recently read Recommendations for interpretation of 12 lead electrocardiogram in the athlete , which is a great paper written by a dozen of merited…

…left hand side). Lead V1 might therefore display a biphasic (diphasic) P wave , meaning that the greater portion of the P wave is positive but…

…causes reciprocal ST segment depressions in V1–V3 (occasionally V4). Leads V7–V9 must be placed to reveal the ST segment elevations. North American (AHA…

…active electrical wavefronts at any given point in time, approximated as a single heart vector [3]. The orientation and intensity of this vector fluctuate throughout…

…Lateral ventricular infarction. Pre excitation. Switched arm electrodes (negative P and QRS T in lead I). Situs inversus. Left posterior fascicular block is diagnosed when…

…Lateral ventricular infarction. Pre excitation. Switched arm electrodes (negative P and QRS T in lead I). Situs inversus. Left posterior fascicular block is diagnosed when…

…isolated (single) T wave inversion in lead V1 is common and normal. It is generally concordant with the QRS complex (which is negative in lead…

…output is insufficient. Aortic regurgitation may cause myocardial ischemia because cardiac output diminishes in parallel with increasing myocardial load (and hence oxygen demand). The most…

…patients with chest pain. A 12 lead ECG recording must be registered and interpreted within 10 minutes of arrival at the hospital. The ECG differentiates…