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THE MICROGRAPH : AN INSTRUMENT WHICH RECORDS THE MICROSCOPIC MOVEMENTS OF A DIAPHRAGM BY MEANS OF LIGHT INTERFERENCE, AND SOME RECORDS OF PHYSIOLOGICAL EVENTS SHOWING THE REGISTRATION OF SOUND WAVES INCLUDING THE HUMAN VOICE.

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A COMPARISON OF SIMULTANEOUS POLYGRAPH AND MICROGRAPH TRACINGS.

F S Meara¹, T H Coffen, A C Crehore

¹Department of Therapeutics of the Cornell University Medical College, New York.

The Journal of Experimental Medicine

|October 30, 2009

Summary

The micrograph offers more accurate heart and blood-vessel movement recordings than the polygraph. This new instrument shows promise as a clinical tool, especially for capturing heart sounds.

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Area of Science:

Cardiology
Biomedical Engineering
Medical Instrumentation

Background:

Traditional methods like the polygraph have limitations in accurately capturing cardiovascular dynamics.
Instrumental inertia in devices such as the polygraph can distort tracings.

Purpose of the Study:

To evaluate the accuracy and utility of a micrograph for recording cardiovascular movements.
To compare the performance of the micrograph against the polygraph.

Main Methods:

Simultaneous recordings were made using both the micrograph and the polygraph.
Analysis focused on the fidelity of tracings for heart and blood-vessel movements.

Main Results:

The micrograph demonstrated superior accuracy in registering heart and blood-vessel movements compared to the polygraph.
Polygraph tracings were found to be distorted due to lever inertia and diaphragm limitations.
The micrograph showed particular efficacy in recording heart sounds.

Conclusions:

The micrograph provides more accurate cardiovascular tracings than the polygraph.
The micrograph has potential as a valuable clinical instrument, especially for analyzing heart sounds.
While not replacing existing tools like the electrocardiograph, the micrograph offers distinct advantages.