All junctional rhythms will create an inverted P wave, but some low atrial impulses can also cause inverted P waves.ī. An inverted P wave can occur before, during, or after the QRS complex. These abnormal conditions will depolarize the ventricles in the normal manner (normal QRS). Junctional arrhythmias create an inverted P wave because the atria are depolarized by the retrograde conduction. “ Aivr (CardioNetworks ECGpedia)” By CardioNetworks: – CardioNetworks: Aivr.jpg (CC BY-SA 3.A. “ Junctional Tachycardia” By James Heilman, MD – Own work (CC BY-SA 4.0) via Commons WikimediaĢ. National Library of Medicine, 19 July 2021. Thus, this is the summary of what is the difference between junctional and idioventricular rhythm. AV node acts as the pacemaker during the junctional rhythm, while ventricles themselves act as the pacemaker during the idioventricular rhythm. Junctional and idioventricular rhythms are two cardiac rhythms generating as a result of SA node dysfunction or the sinus rhythm arrest. Sinus rhythm is the rhythm of our heartbeat. SA node is the default natural pacemaker of our heart and causes sinus rhythm. Summary – Junctional vs Idioventricular Rhythm

The below infographic lists the differences between junctional and idioventricular rhythm in tabular form for side by side comparison. Junctional rhythm can be without p wave or with inverted p wave, while p wave is absent in idioventricular rhythm. So, this is the key difference between junctional and idioventricular rhythm. Idioventricular rhythm is a cardiac rhythm caused when ventricles act as the dominant pacemaker. Junctional rhythm is an abnormal cardiac rhythm caused when the AV node or His bundle act as the pacemaker. What is the Difference Between Junctional and Idioventricular Rhythm? Patients with junctional or idioventricular rhythms may be asymptomatic.Both originate due to secondary pacemakers.They originate mainly when the sinus rhythm is blocked.Junctional and idioventricular rhythms are cardiac rhythms.What are the Similarities Between Junctional and Idioventricular Rhythm? During ventricular tachycardia, ECG generally shows a rate greater than 120 bpm. Accelerated idioventricular rhythm is a type of idioventricular rhythm during which the heart rate goes to 50-110 bpm. Ventricles themselves act as pacemakers and conduct rhythm. Idioventricular rhythm is generated when both the SA node and AV node are suppressed due to structural or functional damages. It is also characterized by the absence of a p wave and a prolonged QRS interval. The heart beats at a rate of less than 50 bpm. Idioventricular rhythm is a slow regular ventricular rhythm. In junctional tachycardia, it is higher than 100 beats per minute, while in junctional bradycardia, it is lower than 40 beats per minute. In accelerated junctional rhythm, the heartbeat will be 60 – 100 beats per minute.

There are four types of junctional rhythms as junctional rhythm, accelerated junctional rhythm, junctional tachycardia, and junctional bradycardia. During junctional rhythm, the heart beats at 40 – 60 beats per minute. But it does not occur in the normal fashion. Due to junctional rhythm, atria begin to contract. Therefore, AV node is the pacemaker of junctional rhythm. Junctional rhythm originates from a tissue area of the atrioventricular node. In an ECG, junctional rhythm is diagnosed by a wave without p wave or with inverted p wave. Junctional rhythm is an abnormal rhythm that starts to act when the Sinus rhythm is blocked. Summary – Junctional vs Idioventricular Rhythm What is Junctional Rhythm? Junctional vs Idioventricular Rhythm in Tabular FormĦ. Similarities – Junctional and Idioventricular Rhythmĥ. When both the SA node and AV node fail to conduct rhythms, ventricles act as their own pacemaker and conduct idioventricular rhythm. AV node acts as the pacemaker and creates junctional rhythm. Junctional and ventricular rhythms are two such rhythms. When the SA is blocked or depressed, secondary pacemakers (AV node and Bundle of His) become active to conduct rhythm. An impulse created by the SA node causes two atria to contract and pump blood into two ventricles. It is the natural pacemaker of the heart. Functionally, SA node is responsible for the rhythmic electrical activity of the heart. Sinoatrial node or SA node is a collection of cells (cluster of myocytes) located in the wall of the right atrium of the heart. The key difference between junctional and idioventricular rhythm is that pacemaker of junctional rhythm is the AV node while ventricles themselves are the dominant pacemaker of idioventricular rhythm.

Junctional escape rhythm