Question

Please explain the devices listed below in detail and how they operate.

1. ECG
2. EEG

Answer 1

1) ECG- * DEFINITION- ECG DEVICES ARE USED TO PRODUCING AN ELECROXARDIO GRAM FROM THE ELECTRICAL SIGNALS FROM THE HEART. * IT HELPS TO DETECT ARRYTHMIAS, CORONARY ARTERY DISEASE, HEART ATTACK ETC * IT IS A SAFE PROCEDURE * IT CONSIST OF ELECTRODES, CONNECTING WIRES, AN AMPLIFIER AND STORAGE AND TRANSMISSION DEVICES. * TWO TYPES OF ECG PRESENT- BI POLAR( LIMB LEADS) UNIPOLAR ( AUGMENTED LIMB LEADS OR CHEST LEADS) * IT CONSIST OF 12, OR 3,0R FIVE LEADS. _ IN 12 LEADS ; 6 ARE LIMB LEADS- PLACED ON ARMS AND LEGS (1, II, III, avL, avR, avF) - another 6 are PRECORDIAL LEADS- PLACED ON CHEST ( V1, V2, V3, V4, V5, V6). * WORKING PRINCIPLE _ STIMULATION OF MUSCLE ALTERS THE ELECRICAL POTENTIAL OF MUSCLE FIBERS. *HOW IS WORKING - WHEN 12 ELECTRODES ARE PLACED ON LIMBS AND CHEST. _ ELECTRODES ARE CONNECTED TO A WIRE, WIRE CONNECTED TO A MONITOR _ THEN RECORDED THE ELECTRICAL SIGNALS FROM THE HEART BEAT INTO A PAPER. 2) EEG MACHINE * IT IS THE DEVICE USED TO FIND PROBLEMS RELATED TO ELECTRICAL ACTIVITY OF THE BRAIN. * IT HELPS TO DETECT SEIZURE DISORDER. * IT CONSIST OF SMALL METAL DISC WITH ELECTRODES OR WIRES. * WORKING PRINCIPLE OF EEG _ SMALL ELECTRODES AND WIRES ARE ATTACHED TO SCALP. _ THE ELECTRODES OBTAIN BRAIN WAVES _ EEG MACHINE AMPLIFIES THE SIGNALS _ RECORDS INTO A WAVE PATTERNS _ THE WAVE PATTERN COPIES INTO A PAPER OR INTO COMPUTER. * EEG MACHINE GIVES FOUR TYPES OF BASIC PATTERNS ( ALPHA, BETA, DELTA, THETA)