…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…

…decrement ≥ 10 % at 3 Hz, sensitivity about 75 %; single fibre EMG about 95 %). Contraindications Known hypersensitivity to edrophonium. Mechanical obstruction of the bowel or the…

…be based on an overall assessment, not on a single threshold value. The combination of physiology, rate of bleeding, the pattern of injury or disease…

…2 AV block, third degree AV block). Sick sinus syndrome or symptomatic bradycardia in the absence of a pacemaker. Hypersensitivity to adenosine. Administration Normal route…

…with the same rate. This occurs if ventricular stimulation is set to be triggered by the atrial impulse. Another cause of pacemaker mediated tachycardia is…

…to rate adjust, which means that the pacemaker fails to adjust its rate according to haemodynamic needs. This is only relevant in rate responsive pacemakers…

…beta blockers in heart failure), which means that the pacemaker is indicated in order to continue treatment with that medication. It should be noted that…

…any heart rate below 50 beats/min is most likely not paced. An intrinsic heart rate faster than the base rate should inhibit the pacemaker…

…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…

…action potential that will spread through the myocardium. Components of an artificial pacemaker Pacemakers consist of an implantable pulse generator (IPG) , which contains the electronics…

…basis Ivabradine is a selective inhibitor of the If, or “funny,” current in sinoatrial node pacemaker cells. This current is a mixed inward Na⁺/K⁺…

…is high and pharmacological interventions are frequently futile. It is often necessary to establish a transcutaneous pacemaker, which is the only treatment with class I…

…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…

…SA node and pacemaker cells in the heart have been discussed previously. Definition (criteria) for sinus rhythm Regular rhythm with a ventricular rate between 50…

…Contraindication : : Absolute The source of bleeding cannot be identified Relative A pacemaker or ICD when monopolar electrocautery is used Relative A cochlear implant Relative The…

…symptoms, blood pressure response, heart rate response, arrhythmias and recovery. A patient who stops at a low workload with a fall in blood pressure is…

…Consequently, shifts in the pacemaker site within the sinus node and sinus exit block may occur. In humans, adenosine initially slows the sinus rate, followed…

…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…

…and equipment used during surgery, particularly electrosurgery. EMI may produce inappropriate sensing, activation of rate responsive functions, device resetting, inhibition of pacing, inappropriate ICD therapy…

…Automaticity of pacemaker cells The automaticity of the cells in the sinoatrial node is explained by the fact that these cells start leaking sodium (Na…

…auerus . This usually affects drug users (intravenous addiction), elderly patients with altered valves, patients with valve prostheses or other cardiac devices (pacemaker, CRT, ICD). In…

…A transcutaneous pacemaker is often necessary in the acute setting and is currently the only treatment with class I recommendation according to European (ESC) and…

…pacemaker under normal circumstances and the rhythm is referred to as sinus rhythm . An arrhythmia is defined as an abnormal heart rhythm or heart rate…

…are clusters of atrial myocardium that possess automaticity and thus pacemaker function. The intrinsic rate of depolarization in these cells is 60 beats per minute…

…permanent pacemaker is generally indicated when reversible causes are absent and the patient is symptomatic or at risk of developing symptoms. The most common non…

…ventricular contractions (PVC) Premature atrial contractions (PAC) PACEMAKER RELATED Pacing with rapid ventricular response rate The incidence of tachycardia induced cardiomyopathy is 8–10% among…

…cryptogenic stroke. Evaluation of antiarrhythmic treatment or pacemaker function. Suspected bradyarrhythmia or pauses, particularly at night. Symptom–rhythm correlation in non specific complaints. The choice…

…block. Right bundle branch block. Non specific intraventricular conduction delay. Hyperkalaemia. Class I antiarrhythmic drugs. Tricyclic antidepressants. Phenothiazines. Ventricular beats or rhythm. Pacemaker. Pre excitation…

…the pain of transcutaneous pacing. It is a bridge to a permanent pacemaker or to resolution of the underlying cause. Contraindications Hypothermia with a body…

…onset atrial fibrillation to sinus rhythm. Vernakalant is used in the following settings: Non surgery patients: atrial fibrillation ≤7 days duration. Post cardiac surgery: atrial…

Arrhythmias and arrhythmology Emergency medicine Pharmacology & dosing Definition and Pathophysiology Bradycardia encompasses a spectrum of rhythm disturbances characterized by an inappropriately slow heart rate. Within…

…and severity of underlying cardiovascular disease. Conduction disease and the need for pacemaker therapy may be more frequent in T2DM, although management follows the same…

…heart disease (including complications) can cause embolisms. Left ventricular aneurysm with thrombus Cardiomyopathies Valve prosthesis Devices (pacemaker, ICD CRT) Endocarditis Cardiac tumors Atherosclerosis of the…

…EAT, or atrial tachycardia) arises when an ectopic focus within the atria generates electrical impulses at a rate exceeding that of the sinoatrial (SA) node…

…AV block often progresses to third degree (complete) AV block, and therefore necessitates an artificial pacemaker. Blocks located proximal to the AV node (prenodal blocks)…

…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…

…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…

…the R wave and/or notch in the descending limb of the S wave In case of complete/incomplete bundle branch block or pacemaker rhythm…

…cardiac rhythm (and thus life) will depend on the awakening of a latent pacemaker. Studies clearly show that a latent pacemaker will virtually always awake…

…of rate controlling drugs (e.g beta blockers) without the risk of worsening the bradycardia. Persons with sick sinus syndrome should receive an artificial pacemaker…

…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…

…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