Shomu Mukherjee died of a heart attack in November.
Although Purkinje fibers and the bundle of His were discovered as early as the 19th century, their specific role in the electrical conduction system of the heart remained unknown until Sunao Tawara published his monograph, titled Das Reizleitungssystem des Sugetierherzens, in 1906
 Of these more than three-quarters are a result of coronary artery disease and stroke

