Which of the following instrument is used for recording the chest-wall movements over the apex of heart?
A. Apexcardiograph
B. Ballistocardiograph
C. Electro-oculograph
D. Electro-retinograph
Answer:A
Which of the following instrument is used for recording the chest-wall movements over the apex of heart?
A. Apexcardiograph B. Ballistocardiograph C. Electro-oculograph D. Electro-retinograph
Explanation: An apexcardiograph records the chest-wall movements over the apex of the heart. These movements are in the form of vibrations having a frequency range of 0.1 to about 20 Hz.