Katz-Wachtel ECG phenomenon

Katz-Wachtel phenomenon (sometimes written as Katz-Wachtel waves).

On ECG:

It refers to the presence of giant, biphasic QRS complexes in the mid-precordial leads (V2–V5).

The QRS complexes are very tall, often more than 50 mm, with both positive and negative deflections in the same complex.

It reflects biventricular hypertrophy (both RVH and LVH present), because forces of both ventricles are so strong and opposing that they produce large biphasic complexes.

Classically described in congenital heart diseases with large left-to-right shunts such as ventricular septal defect (VSD), endocardial cushion defect, or PDA with pulmonary hypertension.

👉 So in one line:

Katz-Wachtel phenomenon = giant biphasic QRS complexes in mid-precordial leads, indicating biventricular hypertrophy, typically seen in large VSD or similar shunt lesions.

Comments

Learn Echocardiography | Standard Protocol for Performing Comprehensive Echocardiogram | Explained with Images and Videos

If you are just starting to learn echocardiography, you will find that learning the full echo examination protocol will be immensely useful. The full protocol will provide a solid foundation for your career in echo. I personally found that once I could execute the standard protocol flawlessly, I was able to add and refine additional echo scanning skills while deepening my understanding of the purpose of each echo image. The echo protocol illustrated in this article is the same one we currently use for all our patients in the hospital and meets or exceeds the standards of American Society of Echocardiography (ASE) for an adult echocardiography examination. The protocol presented here is meant as a guideline and does not cover every aspect (such as off axis views) of an echo examination. Also other hospitals will probably have slight variations of this protocol depending on the lab's needs, which is normal. This article's main purpose is to provide a solid foundation for ...

What is Duke treadmill Score (DTS) and How to calculate it?

Watch this simple video on DTS calculation with example case: Commonly asked questions: How to Calculate Duke treadmill Score? What is DTS? How to risk stratify a patient with ETT (Exercise Tolerance Test)? #Cardiology #Non-Invasive risk Stratification

Approach to Supraventricular Tachycardia - SVT

I would like to share with you about SVTs, or supraventricular tachycardia, today. I'll be focusing on the pathophysiology, ECG features, and the management of SVT today. So this is a brief outline of the lecture today. I will be going through the definition of SVTs, followed by a brief classification of tachyarrhythmias, the pathophysiology behind it all, ECG features, and management principles of SVTs. I will round off the lecture with a clinical scenario related to the topic. This lecture is meant to be a basic introduction to SVTs, and is by all means not exhaustive. So without further ado, let us begin. Supraventricular tachycardias are defined as narrow complex tachycardias where the point of stimulation arises from above the bundle branches. There are many types of SVTs, as will be shown in the next slide, and some are more common than the others. However, in our local context, it is used interchangeably with proximal supraventricular tachycardias, which make up a...

Dr. Usman's Cardiology Notes

Search This Blog