Intensive care unit (ICU) components

1. Patients.

2. Nurses, attenders and duty doctors.

3. Skin electrodes to pick up the ECG potentials.

4. Amplifier for electrocardiograph.

5. A cathode ray tube (CRT) display for viewing ECG waveforms.

6. A rate meter for monitoring heartbeats per minute.

7. Alarm systems.

8. Electrocardiograph

9. A memory-tape loop to record and play back the electrocardiogram.