pqrs

PQRS is a string of four consecutive letters in the Latin alphabet. In general usage, it appears in examples, as a label for a group of related items, or as an acronym that can stand for different phrases depending on the field and context.

In electrocardiography, the letters P, Q, R, and S denote successive electrical deflections of the heart. The term PQRS complex appears in some medical literature to describe the portion of the ECG trace that includes the P wave and the QRS complex, sometimes with the preceding interval. Modern terminology more commonly differentiates between the P wave, the QRS complex, and the T wave, using terms such as the PQ interval and the QRS complex.

Outside medicine, PQRS is used as a label for four items in examples or problems, or as an acronym for various organization names, standards, or project codes, depending on the context. Because it has no single universal meaning, the interpretation of PQRS is context dependent.