Kussmaul's pulse refers to a specific abnormality observed during pulse examination. It is characterized by an increased and exaggerated pulse rate during inspiration, which is not the typical response observed in a normal pulse. Kussmaul's pulse is often associated with certain medical conditions, such as severe metabolic acidosis, diabetic ketoacidosis, or constrictive pericarditis. The abnormal pulse pattern is believed to be a compensatory response of the cardiovascular system to maintain cardiac output in the presence of metabolic acidosis.