electrocardiography Electrocardiography is the process of producing an electrocardiogram (ECG or EKG), a recording of the heart's electrical activity through repeated cardiac cycles. It is an electrogram of the heart which is a graph of voltage versus time of t ...

, a strain pattern is a well-recognized marker for the presence of anatomic

left ventricular hypertrophy Left ventricular hypertrophy (LVH) is thickening of the heart muscle of the left ventricle of the heart, that is, left-sided ventricular hypertrophy and resulting increased left ventricular mass. Causes While ventricular hypertrophy occurs ...

(LVH) in the form of ST depression and

T wave In electrocardiography, the T wave represents the repolarization of the ventricles. The interval from the beginning of the QRS complex to the apex of the T wave is referred to as the ''absolute refractory period''. The last half of the T wav ...

inversion on a resting ECG.Okin, PM Devereux, RB, Nieminen, MS et al (2001)
“Relationship of the electrocardiographic strain pattern to left ventricular structure and function in hypertensive patients: the LIFE study”
'' Journal of the American College of Cardiology'';38(2):514-520. doi:10.1016/S0735-1097(01)01378-X It is an abnormality of

repolarization In neuroscience, repolarization refers to the change in membrane potential that returns it to a negative value just after the depolarization phase of an action potential which has changed the membrane potential to a positive value. The repolarizat ...

and it has been associated with an adverse prognosis in a variety heart disease patients. It has been important in refining the role of ECG LVH criteria in cardiac risk stratification. It is thought that a strain pattern could also reflect underlying

coronary heart disease Coronary artery disease (CAD), also called coronary heart disease (CHD), or ischemic heart disease (IHD), is a type of cardiovascular disease, heart disease involving Ischemia, the reduction of blood flow to the cardiac muscle due to a build-up ...

. Floyd strain includes T-wave inversion "Floyd.".

References

Heart diseases {{circulatory-disease-stub