…general, it is crucial to be familiar with these devices. This section is devoted to artificial pacemakers. More advanced devices (ICD, implantable cardioverter defibrillator; CRT…

…Definition and pathophysiology Cardiac implantable electronic devices (CIEDs) include permanent pacemakers, implantable cardioverter defibrillators (ICDs), and cardiac resynchronization therapy (CRT) devices. Implantable loop recorders are…

…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…

…Ω). The higher the resistance in the lead tip, the smaller the current used. Software settings The pacemaker software includes pre programmed algorithms and settings…

…the lead tip, and thus generate an action potential that will spread through the myocardium. Components of an artificial pacemaker Pacemakers consist of an implantable…

…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…

…Transcutaneous pacing Equipment A defibrillator with a pacing function and self adhesive multifunction pads. A separate three lead ECG cable connected to the patient — 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…

…with a braked, workload controlled resistance; 12 lead ECG with continuous recording; automated or manual blood pressure measurement. Resuscitation trolley with defibrillator, oxygen, suction and…

…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…

…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…

…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…

…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…

…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 …

…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…

…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…

…Table 1 Summary Indications Ticagrelor, in combination with acetylsalicylic acid (ASA), is indicated for the prevention of atherothrombotic events in adult patients with acute coronary…

…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…

…To compute the mean QRS axis, the area under the QRS waveform is measured in at least two leads. Areas above the baseline (typically the…

…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…

…but fundamental part of ECG interpretation. The normal T wave in adults is positive in most precordial and limb leads. The T wave amplitude is…

…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…