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Basic cardiac pacing, pacemaker functions and settings

…well as far field currents (i.e currents generated by tissues that the electrode is not connected to). Also, external signals from electronics (cell phones…

Components and construction of a pacemaker

…action potentials originating in the sinus node, but also by external electrical stimuli that drive the cells to threshold. Any stimulus driving the membrane potential…

What is the difference between cardioversion and defibrillation for arrhythmias?

…devices. Electrode position (anterior posterior vs. antero lateral) does not affect success, but active compression of the pads lowers defibrillation thresholds and improves success, and…

Oesophageal ECG

…Rostock filter or an equivalent amplifier unit between the electrode and the ECG machine. Lidocaine spray for the pharynx and lidocaine gel for the electrode…

Ambulatory blood pressure monitoring and Holter ECG

…specialist investigations. Both fail more often for practical than for medical reasons: the cuff is in the wrong place, the electrodes come off, the patient…

Cardiac arrest during pregnancy and childbirth

…adult recommendations. Electrode pads should be positioned as standard, and defibrillation energy levels should remain consistent with those used for non pregnant adults. The fetus…

The ECG leads: Electrodes, limb leads, chest (precordial) leads and the 12-Lead ECG

…body, act as electrical conductors. By placing electrodes on the skin it is possible to detect these electrical currents. The electrocardiograph (ECG machine) compares, amplifies…

Posterior acute myocardial infarction (STEMI)

…directed towards the back, where there is no exploring electrode (in the 12 lead ECG) that can present the ST segment elevations ( Figure 1 ). Thus…

ECG signs of myocardial infarction: pathological Q-waves & pathological R-waves

…ECG criteria for pathological Q waves (Q wave infarction) Lead Definition of pathological Q wave Normal variants V2–V3 ≥0,02 s or QS complex…

ST elevation myocardial infarction (STEMI) without ST elevations on 12-lead ECG

…The explanation for this is simple: transmural ischemia is due to a complete and proximal artery occlusion and such occlusions must be managed with immediate…

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