…a 0 degree value assigned along the lead axis of V6 [3]. Clinical Implications of Axis Deviation Deviations in the electrical axis serve as critical…

…Extracorporeal Life Support (ECLS) encompasses several extracorporeal systems designed to assist in cases of cardiac or respiratory failure by means of an extracorporeal pump and…

…node discharges electrical impulses at a higher frequency than normal. Similar to sinus rhythm, the rhythm is regular with a positive P wave in lead…

…defined before revascularization Residual ischaemia must be assessed after initiation of medical treatment LV function requires evaluation in the setting of suspected ischaemia or previous…

…the QRS complex. The PR interval is assessed in order to determine whether impulse conduction from the atria to the ventricles is normal. The flat…

…Asystole and pulseless electrical activity (PEA) often have other etiologists, but are also seen in ischemia or infarction when no flow or low flow time…

…The battery is used to deliver pacing pulses, sensing (analyzing electrical activity in the heart) and store electrocardiograms. The pacemaker is powered by a lithium…

…of approximately ≥ 15 mmHg is required to induce spontaneous electrical activity in myocardial cells. CPP below 15 mmHg is insufficient to generate cardiac electrical activity…

…the result of comparing electrical potentials recorded by two electrodes; one electrode is exploring, while the other is a reference electrode. In the remaining 9…

…Piezoelectric crystals have unique electromechanical properties. When an electric current is applied to a piezoelectric crystal, it starts to vibrate and these vibrations generate sound…

…ear discharge, dizziness, tinnitus, fever in a child without an obvious focus, and before every ear syringing. Removal of cerumen: Hearing loss, a blocked sensation…

…of the medium do not travel with the sound wave. The particles merely vibrate and transmit the vibrations to neighboring particles in the medium. Mathematically…

…usually gray). This is possible because the vibrations in the piezoelectric crystals, and thus the electric current they send back to the machine, vary with…

…atria begin to contract again. An unsynchronised shock that happens to fall in the T wave can precipitate ventricular fibrillation, and cardioversion of fibrillation of…

…of the normal heart axis. Figure 1. The electrical axis of the heart (heart axis). As evident from the figure, the normal heart axis is…

…range of normal heart axis. Figure 38. The electrical axis of the heart (heart axis). As evident from the figure, the normal heart axis is…

ECG Video lecture: Assessment of the electrical axis of the heart

…and chaotic ventricular depolarizations, rendering the left ventricle incapable of generating effective contractions. This results in circulatory collapse, loss of consciousness, and sudden cardiac arrest…

…electrical environment The surgical team should establish: Whether electrosurgery or diathermy will be used. Whether monopolar or bipolar electrocautery is planned. The operative site in…

…for ventricular fibrillation, where urgent reversion to sinus rhythm is required. The rationale for electrical therapy over drugs is that, under monitored conditions, a controlled…

…the electrical axis and the waveform in the newborn differ markedly from adult reference values and normalise gradually through childhood. The interpretation is made in…

…an action potential. The intensity of the electrical stimulus is described by its amplitude (measured in volts) and duration (measured in milliseconds). The amplitude and…

…the ECG presents the electrical activity of the atrial and ventricular myocardium. Automaticity of pacemaker cells The automaticity of the cells in the sinoatrial node…

…leads and recording ECGs in pediatric patients (children) Principles of ECG leads, lead anatomy and electrical vectors have been discussed in the chapter The ECG…

…anticoagulant? The unstable patient Immediate electrical cardioversion, without delay, in any of the following: A systolic blood pressure < 90 mmHg caused by the arrhythmia…

…which manifests on the electrocardiogram (ECG) as organized, continuous atrial electrical activity. This activity most commonly presents as a characteristic saw tooth pattern at rates…

…in both arms. Cardiac auscultation. Pulmonary auscultation. Evaluation for heart failure. Assessment for circulatory compromise, haemodynamic instability, or electrical instability. Posterior infarction may occur in…

…the "VASc" nomenclature but clarify that female sex functions as a "risk modifier" rather than a primary driver of anticoagulation decisions [1] . In both paradigms…

…bradyarrhythmias include all bradyarrhythmias, pulse less electrical activity (PEA), and asystole. Bradyarrhythmias are discussed in the chapter Management of Bradycardia (Bradyarrhythmia). Initial rhythm and the…

…and drug induced reactions. Approximately 90% of anaphylactic cardiac arrests present with pulseless electrical activity (PEA) as the initial rhythm, while the remainder manifest ventricular…

…considered. Catheter ablation should be considered in patients with a high risk of recurrence. Electrical cardioversion is generally ineffective in the treatment of atrial tachycardia…

…which delivers the electrical impulse to the posterior and inferior walls of the left ventricle. Anatomical or functional block in the anterior fascicle leads to…

…The electrical impulse will propagate through the left ventricle partially or entirely outside the specialized conduction system. This slower conduction results in a prolonged QRS…

…In PET (Positron Emission Tomography), radiotracers emit positrons. When a positron collides with an electron, they annihilate each other, producing two gamma photons emitted in…

…that the electrical impulse is blocked. Figure 1 illustrates the components of the ventricular conduction system, including the right bundle branch (RBBB). In the presence…

…opposite. The electrical axis is virtually always shifted to the right. Right axis deviation is almost mandatory. S waves are occasionally seen in leads I…

…at later stages, when functional or electrical alterations are evident. Subjective symptoms (i.e. chest pain) appear as the last event in the cascade. Thus…

…measured in the lead in which it is longest, usually II or V5, and the U wave must not be included. Electrical axis Electrical axis…

…above 10 mmHg A fall in systolic blood pressure during inspiration; one of the most useful signs Low voltage on the ECG, electrical alternans Supportive…

…Asystole with no electrical activity at all — pacing has no documented benefit there. Transcutaneous pacing: burns or wounds in the area where the pads would…

…best available for the neonatal period. The intervals are 98% confidence intervals (the mean is presented in the parenthesis). Values without confidence interval are simply…

…electrical or haemodynamic instability, and cardiogenic shock. ACS is distinct from myocardial infarction (MI). MI denotes cardiomyocyte necrosis occurring in the clinical setting of acute…

…and signs of end organ hypoperfusion. In severe cases, bradycardia may progress to bradyarrhythmic arrest or pulseless electrical activity (PEA), presenting as cardiovascular collapse and…

…additional information concerning cardiovascular reserve and electrical stability. Clinical indications Suspected chronic coronary syndrome Exercise ECG may be used in selected patients with suspected chronic…

…is an acute myocardial infarction associated with a working diagnosis of persistent ST segment elevation or an accepted equivalent in the setting of ischaemic symptoms…

…At the time of J 60 and J 80, there is minimal chance that there are any electrical potential differences in the myocardium. Current guidelines…

…RS complexes in multiple leads P pulmonale Figure 1. ECG changes seen in left ventricular hypertrophy (LVH) and right ventricular hypertrophy (RVH). The electrical vector…

Cardiology Introduction Since its initial description in 1992 as a syndrome of right bundle branch block, ST segment elevation, and sudden cardiac death (SCD), Brugada…

…to asphyxiation: a canine model of pulseless electrical activity. Resuscitation 1995;30:16975. Safar P, Paradis NA, Weil MH. Asphyxial cardiac arrest. In: Paradis NA…

…to asphyxiation: a canine model of pulseless electrical activity. Resuscitation 1995; 30:16975. Safar P, Paradise NA, Weil MH. Asphyxial cardiac arrest. In: Paradis NA…

…which has much stronger electrical potentials. Cell types in electrocardiology For the purpose of this discussion it is important to distinguish between two main types…

…similar to those in V5 and V6. Figure 1. ECG changes in left ventricular hypertrophy (LVH) and right ventricular hypertrophy (RVH). The electrical vector of…

…The ECG in Brugada syndrome Brugada syndrome is a rare channelopathy (an electrical disorder caused by mutations in cardiac ion channels) which predisposes the individual…

…or sudden cardiac death. The resulting extensive ischemia causes immediate myocardial stunning (akinesia) and electrical instability. Fewer than 1% of patients with ST elevation myocardial…

…diminish the QRS amplitudes. Electrical alternans: The amplitude of the QRS complexes vary from one beat to another (in the same lead). This is due…

…as it does not represent a true conduction block but rather a delay in the propagation of electrical impulses from the atria to the ventricles…

…random electrical event. An excerpt from the article follows: [...] Of every 10 such victims, the heart in 6 or 7 showed no recent disease in…

…the most promising improvement. 1 Given the wide use of pacemakers and the trend towards increased use of cardiac devices in general, it is crucial…

…electrical impulses from the atria to the ventricles. Conduction through the AV node is intentionally slow (due to the low concentration of gap junctions in…