What is Gallop rhythm

3 sounds heard during each cardiac cycle produce triple rhythm

Triple rhythm with sinus tachycardia produce Gallop rhythm imitating the sounds of galloping horse.
LV S3 gallop - is an important auscultatory sign of Left ventricular failure.
LVS3 is a sign of systolic dysfunction of ventricle.
Early S3 is heard in RVEMF -this is due to sudden limitation of ventricular filling.
Pericardial knock - An early S3 in constrictive pericarditis as in RV EMF.

S3 gallop is common in:

1. Dilated cardiomyopathy.
2. Decompensated aortic valve disease.
3. Decompensated hypertensive heart disease.

RV S3 is always pathological
It is heard at LLSB.
Inspiratory augmentation is  present.
This is  associated with tricuspid regurgitation.

Atrial gallop S1,S2, S4
Ventricular gallop S1, S2, S3

Quadruple Rhythm
Quadruple rhythm is the presence of 4 heart sounds
(S1, S2, S3 and S4).

Summation Gallop
Summation is the presence of S1,S2 with merged S3 and S4