An instrument that simultaneously records the heart's contractions and the pulse wave patterns.
Greek 'kardia' (heart) + 'sphygmos' (pulse) + 'graph' (to write, record), an instrument name from late 19th-century cardiology. The device combined mechanics of heartbeat recording with pulse tracing technology.
Early cardiosphygmographs used mechanical arms and ink-soaked needles to draw wiggly lines on rolling paper—the same technology that created the first lie detector tests—and doctors could literally see the heart and pulse working together in real time.
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