What does a tall QRS indicate?
Tall QRS complexes are usually caused by hypertrophy of one or both ventricles, or by an abnormal pacemaker or aberrantly conducted beat. Low voltage or abnormally small QRS complexes may be seen in obese patients, hyperthyroid patients and pleural effusion.
Why QRS complex is high amplitude?
Ventricles contain more muscle mass than the atria. Therefore, the QRS complex is considerably larger than the P wave.
What does the QRS represent on an ECG?
The QRS wave is produced by the atrioventricular node (AV). The P wave in an ECG complex indicates atrial depolarization. The QRS is responsible for ventricular depolarization and the T wave is ventricular repolarization.
What is the treatment for wide complex tachycardia?
SVT will typically be managed with adenosine, Afib with WPWS will be treated with amiodarone, and Afib with aberrancy with either diltiazem or a beta-blocker. Typically, amiodarone will be the first-line drug of choice for all ventricular arrhythmias (VT, polymorphic VT, Vfib, etc.)
How long is a QRS complex?
The QRS duration represents the time for ventricular depolarization. The duration is normally 0.06 to 0.10 seconds. Q waves are inscribed when the initial QRS vector is directed away from the positive electrode.
What does a short QRS mean?
low voltage QRS complexes and electrical alternans. Low. voltage QRS complexes may be due to short-circuiting of. cardiac potentials by the pericardial fluid surrounding the. heart.
How do you read a Pqrst on an ECG?
Basic PQRST:
- P-wave: The first little “hump” or “bump” you see is known as the P-wave.
- Study tip: The P-wave represents ATRIAL DEPOLARIZATION (depolarization is a big, fancy word for CONTRACTION).
- QRS Complex: The next area you see is a big spike.
What does wide complex tachycardia look like on ECG?
Two ECG features define wide-complex tachycardia: a QRS complex >120 ms and a heart rate of >100 beats per minute [1]. Patients with wide-complex tachycardia can present at the emergency department (ED) haemodynamically stable or unstable.
What drugs should be avoided with wide complex tachycardia?
It is so very critical to choose the right kind of medication once the decision is made to treat a patient with wide complex tachycardia. Calcium channel blockers (Diltiazem and verapamil) are strongly advised not to be used for fear of hemodynamic collapse, hypotension and cardiac arrest [4].
What are the characteristics of tall QRS?
Shorter than “normal” duration of the QRS complex Abnormally high amplitude of the R wave (“tall QRS”) with a steep upstroke of the initial portion, especially evident in the inferior and left precordial leads with which it is associated
What is normal QRS width?
Normal QRS width is 70-100 ms (a duration of 110 ms is sometimes observed in healthy subjects). The QRS width is useful in determining the origin of each QRS complex (e.g. sinus, atrial, junctional or ventricular). Narrow complexes (QRS < 100 ms) are supraventricular in origin. Broad complexes (QRS > 100 ms) may be either ventricular in origin,
What are the 4 characteristics of the QRS complex?
ABNORMALITIES OF THE QRS COMPLEX. The normal QRS complex has four characteristics: 1. Its duration is no greater than 120 ms (three small squares). 2. In a right ventricular lead (Vj), the S wave is greater than the R wave. 3. In a left ventricular lead (V 5 or V 6), the height of the R wave is less than 25 mm.
What increases the height of the QRS complex?
INCREASED HEIGHT OF THE QRS COMPLEX. An increase of muscle mass in either ventricle will lead to increased electrical activity, and to an increase in the height of the QRS complex. Right ventricular hypertrophy. Right ventricular hypertrophy is best seen in the right ventricular leads (especially V 1.