Electrocardiogram Electrocardiogram

Electrocardiogram

یکشنبه, 06 بهمن 1398 ساعت 09:26
این مورد را ارزیابی کنید
(0 رای‌ها)

An electrocardiogram also termed an ECG or EKG (K means kardia for heart in Greek) or a 12 lead ECG. is a simple test that records the heart's electrical activity. The ECG machine is designed to recognise and record any electrical activity within the heart. It provides information about the function of the intracardiac conducting tissue of the heart and reflects the presence of cardiac disease through its electrical properties. Understanding ECG helps to understand how the heart works. With each heartbeat, an electrical impulse starts from the superior part of the heart to the bottom. The impulse prompts the heart to contract and pump blood.

Some heart problems are easier to diagnose when your heart is working hard and beating fast. During stress testing i.e. exercise ECG, exercise is used to make the heart work hard and beat fast while an EKG is done. If exercise can't be done, you'll be given medicine to make your heart work hard and beat faster. Heart rate and blood pressure will also be monitored throughout the test period. It usually takes about 7 to 12 minutes to complete.

Purpose of ECG Test


ECG is used to

  1.  Detect bradycardia and tachycardia.
  2.  Determine if symptoms, such as chest pain, shortness of breath or palpitations are due to a heart problem[2].
  3.  Know steady or irregular heart rhythm.
  4.  Know the strength and timing of electrical signals as they pass through each part of your heart
  5.  Detect other disorders that affect heart function.
  6.  Study and detect many heart problems, such as heart attacks, arrhythmia, heart failure.
  7.  Assess coronary blood flow and heart valves integrity.
  8.  Monitor deeply-sedated patients and for consciously-sedated patients with compromised cardiovascular function.
  9.  Monitor some medications for the heart.
  10.  The indications for exercise electrocardiography include to ascertain the correct exercise prescription, the investigation of angina and post-myocardial infarction assessment as well as the postoperative examination of bypass surgery.

Electrode and Lead

An electrode is a sensor (conductive pad) attached to the skin and enables recording of electrical currents. An ECG lead is a graphical description of the electrical activity of the heart created by reading several electrodes. This means that each ECG lead is gotten by analysing the electrical currents detected by several electrodes. A 12-lead ECG is obtained using 10 electrodes. These 12 leads consists of limb leads and chest leads (percordial leads). For further reading see...
To better under why there are only 10 leads instead of 12 leads read about Einthoven's triangle and the heart's action potential generation.

ECG PAPER

The ECG paper is a strip of graph paper with large and small grids with horizontal axis (Time in seconds) and vertical axis(amplitude in volts). Each 1 mm square (the smallest square) represents 0.04 second and each large square (5 mm) represents 0.2 second. On the vertical axis, each large square represents 0.5mV and each small block equals 0.1mV.

خواندن 253 دفعه آخرین ویرایش در یکشنبه, 06 بهمن 1398 ساعت 09:54
admin

نظر دادن

Make sure you enter all the required information, indicated by an asterisk (*). HTML code is not allowed.

گیرنده: رامتن

ورودی نا معتبر میباشد

Invalid Input

ایمیل خود را بنویسید