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electrocardiogram Sinus bradycardia is a sinus rhythm with a reduced rate of electrical discharge from the sinoatrial node , resulting in a bradycardia , a heart rate that is lower than the normal range (60–100 beats per minute for adult humans).
Bradycardia, also called bradyarrhythmia, is a resting heart rate under 59 beats per minute (BPM). [1] While bradycardia can result from various pathologic processes, it is commonly a physiologic response to cardiovascular conditioning or due to asymptomatic type 1 atrioventricular block.
The ECG shows AV-junctional rhythm resulting in bradycardia at around 46 beats per minute. This ECG from the same patient shows atrial fibrillation at around 126 beats per minute. The most common complication of sinus node dysfunction is the development of tachycardia-bradycardia syndrome with abnormal atrial rhythms such as atrial tachycardia ...
[3] [7] Bradyarrhythmias are due to sinus node dysfunction or atrioventricular conduction disturbances. [8] Arrhythmias are due to problems with the electrical conduction system of the heart. [2] A number of tests can help with diagnosis, including an electrocardiogram (ECG) and Holter monitor. [5] Many arrhythmias can be effectively treated. [2]
Illustration of an implantable cardioverter-defibrillator (ICD) An implantable cardioverter-defibrillator (ICD) is a battery-powered device that monitors electrical activity in the heart, and when an arrhythmia is detected, can deliver an electrical shock to terminate the abnormal rhythm. ICDs are used to prevent sudden cardiac death (SCD) in ...
The criteria to diagnose a right bundle branch block on the electrocardiogram: The heart rhythm must originate above the ventricles (i.e., sinoatrial node, atria or atrioventricular node) to activate the conduction system at the correct point. The QRS duration must be more than 100 ms (incomplete block) or more than 120 ms (complete block). [9]
ECG recorded from a 17-year-old male with Lown-Ganong-Levine syndrome. LGL syndrome is diagnosed in a person who has experienced episodes of abnormal heart racing (arrhythmias) who has a PR interval less than or equal to 0.12 second (120 ms) with normal QRS complex configuration and duration on their resting ECG. [1]. [citation needed]
Still, the real predictive value of these findings is questioned. Late potentials may be found in 0-10% of normal volunteers. When used as a prognostic factor for the development of ventricular tachycardia, they have a sensitivity of 72% and a specificity of 75%, yielding a positive predictive value of 20% and a negative predictive value of 20%.