Electrocardiography: A Visit to Heart

Electrocardiography: A Visit to Heart


You got discomfort, you visits Doctor, doctor recommends test for the diagnosis, after diagnosis reports come, this is the time where you must get aware regarding reading or somehat understanding of reports. Here is the overview of ECG, let’s talk about it, Whenever heart problem persists for long with symptoms like nausea, chest pain etc or for other diseases connection to heart, your physician suggests you ECG i.e., Electrocardiogram which means a technique or recording (Gram) electrical activity (Electro) generated by the cells of heart (Cardio) that reaches the body surface. Result is the graph form generated by the machine that records the ECG which consists of sophisticated Galvanometer detecting and recording changes in potential between positive and negative pole

Standardization:
1  Normal 1mV= 10mm, the signal will have clear and perfect right angles to each other.
2  Over damping happens when the pressure of writing stylus is too firm resulting in rounding at edges, and diminished deflections amplitude.
3  Under damping happens when the writing stimulus is too loose resulting in sharp spikes at the corners and increased deflection amplitude.


Any type of change in heart activity is recorded in the form of graph on paper as a plot of voltage on vertical axis against time on horizontal axis. ECG paper speed is 25mm/sec, fastest speed for clear depiction of waveform morphology.
Practical points for Recording ECG
1  Electrode should be selected for maximum adhesiveness and minimum discomfort, electrical noise and skin-electrode impedence.
2  There should be effective contact between electrode and skin.
3  Skin should be clean only with dry wipe to prevent Base Line Wander when shift occurs gradually or shifting baseline when shifting occurs abruptly.
4  Position should be supine while recording ECG.

I hope this information will be somehow fruitful for all as according to me we should be well aware about the tests that doctor recommends and why?

 

Author: Dr. Megha Sharma (Science Dept.)