Description:

3-Channel ECG

• Function: Prints 3 waveforms at a time, often in a 3×4 format (3 leads printed across, 4 sections) or showing a rhythm lead.
• Use: Good for basic screening, portable settings, and quick rhythm checks, but less detailed than higher channel machines. 

• Function: Prints more waveforms simultaneously, often showing limb leads and chest leads in various combinations (e.g., 3 limb + 3 chest leads).
• Use: Offers a better view than 3-channel, useful in clinics and ambulances for more detailed cardiac assessment.

• Function: Records all 12 standard leads (6 limb, 6 chest) at once, providing a complete electrical picture of the heart.
• Use: The gold standard for detailed diagnosis, detecting subtle issues like ischemia, infarction, hypertrophy, and complex arrhythmias by viewing the heart from 12 distinct perspectives. 

• Simultaneous Acquisition: Captures multiple signals at once, reducing recording time.
• Digital Filtering: Removes noise from muscle tremors or baseline wandering.
• Auto-Analysis: Some machines provide automated interpretation and measurements (HR, intervals, axes).
• Portability: Many models have rechargeable batteries for mobile use.
• Display: Modern devices often feature color LCD screens for real-time viewing.