Descriptions: Tall R wave caused by possible thickening of heart muscle wall.

Left ventricular hypertrophy (LVH) is the thickening of the myocardium (muscle) of the left ventricle of the heart.

Left ventricular hypertrophy
Classification and external resources
A heart with left ventricular hypertrophy in short-axis view
ICD-10	I51.7
ICD-9	429.3
DiseasesDB	7659
MeSH	D017379

While ventricular hypertrophy occurs naturally as a reaction to aerobic exercise and strength training, it is most frequently referred to as a pathological reaction to cardiovascular disease, or high blood pressure.^[1]
While LVH itself is not a disease, it is usually a marker for disease involving the heart.^[2] Disease processes that can cause LVH include any disease that increases the afterload that the heart has to contract against, and some primary diseases of the muscle of the heart.

Causes of increased afterload that can cause LVH include aortic stenosis, aortic insufficiency and hypertension. Primary disease of the muscle of the heart that cause LVH are known as hypertrophic cardiomyopathies, which can lead into heart failure.

Long-standing mitral insufficiency also leads to LVH as a compensatory mechanism.
 

The principal method to diagnose LVH is echocardiography, by which the thickness of the muscle of the heart can be measured. The electrocardiogram (ECG) often shows signs of increased voltage from the heart in individuals with LVH, so this is often used as a screening test to determine who should undergo further testing.

Reference: https://en.wikipedia.org/wiki/Left_ventricular_hypertrophy

Post by: Harvey Chen , 帕金森氏症的抗病心路歷程

Descriptions: Missed beat at 80 BPM. Normal sinus rhythm, but every 10 th beat is missing.

Descriptions: Normal sinus rhythm except P-wave originates in the AV node instead of SA node. Shortened PR internal of 0.09 seconds.

Descriptions: All complexes normal and frequency is between 60 to 100 beats per minute.

Descriptions: ECG tracing of users with pacemakers.

Descriptions: ECG tracing of users with pacemakers.

Descriptions: A repeated periods of very fast heartbeat which begin and ends suddenly. 160 BPM for 5 seconds alternating with normal sinus rhythm at 80 BPM.

Descriptions: A beat occurs early in the atria causing the heart to beat before the next regular beat.

Descriptions: A beat occurs early in the AV node causing before the next beat. (Nodal rhythm – a cardiac rhythm paced by the AV node – short PR interval)

Descriptions: Ventricles contract before signals reached AV node. Time interval between normal R peaks is a multiple of R-R intervals.