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

…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…

…local expertise. Clinical Presentation and Indications Stress echocardiography is used in patients with suspected or known CAD when the clinical question concerns the presence, extent…

…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…

…main principle behind artificial pacemakers; i.e applying an external electrical current that depolarizes cells in contact with the lead tip, and thus generate an…

…ventilation and automatic external defibrillator (AED). Return of Spontaneous Circulation (ROSC) : Return of mechanical cardiac function resulting in circulation with pulse. Coronary perfusion pressure (CPP) …

…during the cardiac cycle, all ECG leads analyze the same electrical events but from different angles. This means that ECG leads with similar angles must…

…When an electric current is applied to a piezoelectric crystal, it starts to vibrate and these vibrations generate sound waves with frequencies between 1.5…

…grommets, ear discharge or pain on contact with water. A history of ear surgery in which the middle ear may be open (a mastoid cavity…

…This is illustrated in Figure 3. Figure 3. Wavelength Wavelength is defined as the distance between two points (along the sound wave) with equal amplitude…

…possible because the vibrations in the piezoelectric crystals, and thus the electric current they send back to the machine, vary with the amplitude of the…

…Everything else in the procedure is routine. Synchronised cardioversion or unsynchronised defibrillation Synchronised cardioversion Unsynchronised defibrillation : : : Rhythm An organised rhythm with discernible QRS complexes: atrial…

…Left anterior fascicular block is diagnosed if the axis is between 45° and 90° with qR complex in aVL and QRS duration 0,12 s…

…anterior fascicular block is diagnosed if the axis is between 45° and 90° with qR complex in aVL and QRS duration is 0,12 s…

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

…of developing ventricular fibrillation, in any situation. ECG features of ventricular fibrillation The ECG shows irregular waves with varying morphology and amplitude. No P wave…

…In patients with resynchronization devices, maintaining CRT during surgery is recommended to provide better haemodynamic stability. Define the operative electrical environment The surgical team should…

…regulated electrical shock to terminate a tachyarrhythmia, and it encompasses both synchronized cardioversion and defibrillation ; the key distinction is timing relative to the cardiac cycle…

Referensvärden A child's ECG changes continuously with age: the heart rate, the electrical axis and the waveform in the newborn differ markedly from adult…

…rate, the behavior of the pacemaker in the presence and absence of intrinsic cardiac activity, Modern pacemakers are packed with algorithms that optimize the function…

…Subsequently, outward directed potassium (K + ) channels open which results in cell repolarization. The cycle then repeats itself ( Figure 1 ). Note that the leakage of sodium…

…on the anterior axillary line, on level with V4. V6: placed on level with V4 and V5, in the mid axillary line. V4R: placed on…

…Immediate electrical cardioversion, without delay, in any of the following: A systolic blood pressure < 90 mmHg caused by the arrhythmia. Ongoing myocardial ischaemia with…

…electrical activity. This activity most commonly presents as a characteristic saw tooth pattern at rates typically exceeding 200 beats per minute. While ECG appearances with…

…haemodynamic instability, or electrical instability. Posterior infarction may occur in patients with a clinically unstable acute coronary syndrome, but the examination does not reliably establish…

…association with ischemic stroke and systemic embolism. The contemporary understanding of AF has evolved significantly; it is no longer viewed merely as an electrical anomaly…

…load (the ventricle is empty or nearly empty). In patients with an initial shockable rhythm, compressions and ventilation can extend the duration of the shockable…

…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…

…EAT) most commonly occurs in individuals with underlying structural or electrical heart disease. Less frequently, it may also present in individuals without identifiable cardiac disease…

…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 cardiac cycle begins in the sinus node (sinoatrial node), where depolarization occurs through automaticity (refer to Cardiac Electrophysiology). The electrical impulse propagates through the…

…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…

…Along with larger R waves in right sided leads, the R wave progression may be opposite. The electrical axis is virtually always shifted to the…

…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…

…The normal values below apply to adults in sinus rhythm, recorded at a paper speed of 50 mm/s with 1 mV = 10 mm…

…looks. With ultrasound guidance, the point at which the fluid lies most superficially is chosen and the needle is followed all the way in, which…

…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…

…Table 2. Reference values for the most important parameters (Rijnbeek et al) Numbers are medians with 2 nd and 98 th percentile in parenthesis. These…

…and with or without an acute rise in cardiac troponin. The spectrum ranges from symptom free presentation to persistent chest discomfort, cardiac arrest, electrical or…

…level, producing atrioventricular (AV) or intraventricular blocks. Isolated sinus bradycardia in the early hours following infarction may be associated with hemodynamic compromise. More broadly, bradyarrhythmic…

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

…and families should be educated to recognize chest discomfort or dyspnoea as potentially indicating myocardial infarction, particularly in individuals with hypertension, diabetes or previous angina…

…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…

…to electrical storm and sudden cardiac arrest (SCA) as the index presentation. Over the past three decades, the management of BrS has been fraught with…

…as outlined in the studies by DeBehnke et al. and Safar et al. The majority of all asphytic cardiac arrests begin with PEA and progress…

…cultures to identify potential pathogens and guide antimicrobial therapy. Administer broad spectrum antibiotics in accordance with local clinical guidelines, ensuring timely initiation to optimize outcomes…

…repolarization) since it coincides with ventricular depolarization (i.e. QRS complex), which has much stronger electrical potentials. Cell types in electrocardiology For the purpose of…

…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…

…confused with right bundle branch block. Paper speed 50 mm/s. Type 1 Brugada syndrome reminds somewhat of right bundle branch block (RBBB) in leads…

…resulting extensive ischemia causes immediate myocardial stunning (akinesia) and electrical instability. Fewer than 1% of patients with ST elevation myocardial infarction (STEMI) who reach the…

…and ischemia may also cause electrical alternans. PQ segment depression. Sinus tachycardia. Refer to Figure 1 . Figure 1. Electrical alternans in patient with cardiac tamponade…

…third degree AV block). A pacemaker is often necessary in individuals with first degree AV block and wide QRS complexes. Treatment of first degree AV…

…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 wide use of pacemakers and the trend towards increased use of cardiac devices in general, it is crucial to be familiar with these devices…

…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…