Sir Arthur Salusbury MacNalty KCB MRCS FRCP FRCS FRSE (20 October 1880 – 11 April 1969) was the 8th Chief Medical Officer of the United Kingdom.
In 1908, early in his career, he joined with the Welshman Thomas Lewis (cardiologist) to demonstrate that tracings from the nascent science of electrocardiography (ECG) could be used as a tool for diagnosing Heart block.
[2][3] He was particularly concerned with the neurological side effects of the popular practice of dosing with thyroid extract to lose weight.
[8] Arthur MacNalty was born in Glenridding in Westmorland into a long line of Irish physicians living in the Britain.
MacNalty became an authority on communicable diseases, public health and on endocrine system based neurological disorders.