#Scottish #cardiologist, pioneer in the study of #cardiac #arrhythmias. He was first to make simu…
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#Scottish #cardiologist, pioneer in the study of #cardiac #arrhythmias. He was first to make simultaneous records of the #arterial and #venous pulses to evaluate the condition of the #heart, a procedure that laid the foundation for much future research.
#Mackenzie also drew attention to the question of the heart's capacity for work, paving the way for the study of the energetics of the heart #muscle. His work was particularly important in distinguishing #AtrialFibrillation and in treating this common condition with #digitalis.
In 1892, he built a machine for detecting and recording #physiological activity, such as #PulseRate and #BloodPressure, since known as a #Polygraph, and later used as a #LieDetector.
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