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2. Ventricular flutter - Wikipedia

   en.wikipedia.org/wiki/Ventricular_flutter

   Ventricular flutter is an arrhythmia, more specifically a tachycardia affecting the ventricles with a rate over 250-350 beats/min, and one of the most indiscernible. It is characterized on the ECG by a sinusoidal waveform without clear definition of the QRS and T waves.

3. Right bundle branch block - Wikipedia

   en.wikipedia.org/wiki/Right_bundle_branch_block

   Right bundle branch block; An illustration of a right bundle branch block located in intraventricular septum: ECG characteristics of a typical RBBB showing wide QRS complexes with a terminal R wave in lead V1 and a prolonged S wave in lead V6.

4. Bundle branch block - Wikipedia

   en.wikipedia.org/wiki/Bundle_branch_block

   The ECG will show a terminal R wave in lead V1 and a slurred S wave in lead I. Left bundle branch block widens the entire QRS, and in most cases shifts the heart's electrical axis to the left. The ECG will show a QS or rS complex in lead V1 and a monophasic R wave in lead I.

5. Right atrial enlargement - Wikipedia

   en.wikipedia.org/wiki/Right_atrial_enlargement

   Right Atrial Enlargement (RAE) increases the p wave, representing atrial depolarization, on an ECG to an amplitude > 2.5mm in lead II, an abnormality referred to as p-pulmonale, likely due to weakened right atrial myocardium close to the Sinoatrial (SA) node.

6. Right heart strain - Wikipedia

   en.wikipedia.org/wiki/Right_heart_strain

   On an electrocardiogram (ECG), there are multiple ways RV strain can be demonstrated. A finding of S1Q3T3 [ b ] is an insensitive [ 10 ] sign of right heart strain. [ 11 ] It is non-specific (as it does not indicate a cause) and is present in a minority of PE cases. [ 12 ]

7. Premature ventricular contraction - Wikipedia

   en.wikipedia.org/wiki/Premature_ventricular...

   Premature ventricular contraction in an ECG (arrows) of a dog, caused by dilated cardiomyopathy. Premature ventricular contractions occur in healthy persons of any age, but are more prevalent in the elderly and in men. [3] In a very significant proportion of people they occur spontaneously with no known cause. [citation needed]