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...

characteristics. Most have a narrow QRS complex, although, occasionally, electrical conduction abnormalities may produce a wide QRS complex that may mimic ventricular...

an ECG: The P wave, which represents depolarization of the atria. The QRS complex, which represents depolarization of the ventricles. The T wave, which...

Pan–Tompkins algorithm is commonly used to detect QRS complexes in electrocardiographic signals (ECG). The QRS complex represents the ventricular depolarization...

Type 1 and Type 2. In both types, a P wave is blocked from initiating a QRS complex; but, in Type 1, there are increasing delays in each cycle before the...

a rate of greater than 120 beats per minute and at least three wide QRS complexes in a row. It is classified as non-sustained versus sustained based on...

frontal plane direction between −30° and −90°. This is reflected by a QRS complex positive in lead I and negative in leads aVF and II. There are several...

before every QRS complex in a ratio of 1:1. Normal P wave axis (0 to +75 degrees) Normal PR interval, QRS complex and QT interval. QRS complex positive in...

the QRS complex and the T wave and has a duration of 0.005 to 0.150 sec (5 to 150 ms). It starts at the J point (junction between the QRS complex and...

wide complex based on the QRS complex. Equal or less than 0.1s for narrow complex. Presented in order of most to least common, they are: Narrow complex Sinus...

ventricular myocardium produces the QRS complex on the ECG. Atrial repolarization occurs and is masked during the QRS complex by ventricular depolarization...

electrocardiogram with a normal QRS complex accompanied by an inverted P wave either before, during, or after the QRS complex. An AV-junctional escape beat...

the speed at which they are able to conduct an electrical impulse. The QRS complex represents the conduction of the ventricles of the heart, the speed at...

conduction through the bundle of His-Purkinje fibres, the QRS complex is seen to be widened. The QRS complex often shows an extra deflection that reflects the...

repolarization of the ventricles. The interval from the beginning of the QRS complex to the apex of the T wave is referred to as the absolute refractory period...

method: First, identify the lead with the smallest QRS complex or isoelectric (flat) QRS complex (lead a). After locating the axis of the lead on the...

Look up QRS in Wiktionary, the free dictionary. QRS may refer to: QRS complex QRS concordance QRS Music Technologies, recording and musical instrument...

wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120...

slurred upstroke in the QRS complex that is associated with a short PR interval. The short PR interval and slurring of the QRS complex are reflective of the...

it is seen as wide QRS complexes lasting ≥120ms with characteristic QRS shapes in the precordial leads, although narrower complexes are seen in children...

interval (in other words, a sinus rhythm) represent the first rhythm. The QRS complexes with a regular R-to-R interval represent the second rhythm. The PR interval...

duration of the QRS complex on the ECG exceeds 120 ms. A right bundle branch block typically causes prolongation of the last part of the QRS complex and may shift...

phenomenon, also known as Ashman beats, describes a particular type of wide QRS complex, often seen isolated that is typically seen in atrial fibrillation. It...

ECG, there is no relationship between P waves and QRS complexes, meaning the P waves and QRS complexes are not in a 1:1 ratio. Third-degree AV block is...

negative QRS complex in leads II, III, and aVF). The delayed and unopposed activation of the remainder of the LV now results in a shift in the QRS axis leftward...

episodes of abnormal heart racing with a short PR interval and normal QRS complexes seen on their electrocardiogram when in a normal sinus rhythm. LGL syndrome...

are averaged to remove interference and reveal small variations in the QRS complex, usually the so-called "late potentials". These may represent a predisposition...

QRS complex). As a result, the time from the QRS complex to the P wave (the RP interval) is short, less than 50% of the time between consecutive QRS complexes...

controls the rhythmic beating of the heart muscle cells, especially the complex impulse-generation and muscle contractions in the atrial chambers. The...

optimal moment in the cardiac cycle which corresponds to the R wave of the QRS complex on the ECG. Timing the shock to the R wave prevents the delivery of the...