Henri Vaquez

French internist known for his work in the field of hematology and his research of heart disease. In 1892 he was the first to describe the blood disorder polycythaemia vera or polycythaemia rubra vera, which is also known as "Osler-Vaquez disease" (named with physician William Osler (1849–1919). Vaquez described the disease in a 40-year-old male suffering from chronic cyanosis, distended veins, vertigo, dyspnea, hepatosplenomegaly, palpitations and marked erythrocytosis.

He was among the first physicians to recognize the correlation of Stokes-Adams attack to interference of the bundle of His causing a discordant beating of the atria in relation to that of the ventricles. He is credited with introducing the electrocardiogram and recording of the jugular venous pulse into French medicine. He also conducted research of cardiac arrhythmia and hypertension.

He died on 15 April 1936, aged 75, in Paris.