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Unstable patients exhibit signs of chest pain, hypotension, elevated heart rate, and/or heart failure. Patients who develop cardiac arrest will be pulseless and unconscious. Defibrillation and resuscitation is indicated in these cases. Patients with cardiac arrest should be given IV magnesium sulfate over a period of two minutes.
The first studies correlate between incidence of notching and slurring in the QRS complexes to the existence and severity of coronary heart disease. [2] In 1979, a novel signal processing technique, including spatial filtering, averaging and alignment was used to show that HFQRS from patients in coronary care unit are less stable than in ...
The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG). It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the heart and contraction of the large ventricular muscles.
Intraventricular conduction delay seen in precordial/chest leads with QRS duration 100 ms. An EKG of a 25-year-old male. Intraventricular conduction delays (IVCD) are conduction disorders seen in intraventricular propagation of supraventricular impulses resulting in changes in the QRS complex duration or morphology, or both.
Patients with LBBB require complete cardiac evaluation, and those with LBBB and syncope or near-syncope may require a pacemaker. Some patients with LBBB, a markedly prolonged QRS (usually > 150 ms), and systolic heart failure may benefit from a biventricular pacemaker, which allows for better synchrony of heart contractions. [8]
The QRS complex represents the conduction of the ventricles of the heart, the speed at which they are able to conduct an electrical impulse. The interval between each R wave represents the heart rate, which is critical for determining different rhythms within the defined categories.
Electrical alternans is an electrocardiographic phenomenon of alternation of QRS complex amplitude or axis between beats and a possible wandering base-line. It can be seen in cardiac tamponade and severe pericardial effusion and is thought to be related to changes in the ventricular electrical axis due to fluid in the pericardium, as the heart essentially wobbles in the fluid filled ...
An idioventricular rhythm is a cardiac rhythm characterized by a rate of <50 beats per minute (bpm), absence of conducted P waves and widening of the QRS complex. [1] In cases where the heart rate is between 50 and 110 bpm, it is known as accelerated idioventricular rhythm and ventricular tachycardia if the rate exceeds 120 bpm.
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