26 Questions
What does ECG stand for?
Electrocardiogram
What is the normal speed at which an ECG machine records heart beats over time?
25mm/s
What should be checked when having an ECG?
Date/time, patient's name, sex, ID
What does the voltage represent in an ECG?
Height and depth of the waves that represent the heart's electrical activity
What is the standard speed calibration for a properly calibrated ECG machine?
$1mV signal produces a 10mm deflection$
What is the normal PR interval in an ECG when set at normal standardization?
$0.12-0.20 seconds < 1 big square$
What is the normal duration of the P wave in an ECG?
0.12 seconds
Which condition is associated with a prolonged QT interval at slower heart rate?
Hypomagnesemia
What does a hyperacute T wave indicate in an ECG?
ST elevation myocardial infarction (STEMI)
How is left axis deviation determined in an ECG?
Lead I is positive and leads II & III are negative
What does ST depression of more than 0.5mm indicate in an ECG?
Ischaemia
What does a biphasic T wave or flattened T wave indicate in an ECG?
$K^+$
Which lead is used to determine the midclavicular line in an ECG?
V4
What does a peaked T wave indicate in an ECG?
Hyperkalemia
What is the normal amplitude of ST-elevation in an ECG?
> 1 mm (0.1 mV)
What is the normal duration of the ST segment in an ECG?
0.16 seconds
What is the duration of the PR interval in an ECG when set at normal standardization?
0.12 seconds
What condition is associated with a prolonged QT interval at slower heart rate?
Hypokalemia, Hypomagnesemia, Hypocalcemia
How is left axis deviation determined in an ECG?
If lead I is positive (R wave) and lead II & III are negative, this indicates left axis deviation.
What does the presence of a peaked T wave in an ECG indicate?
Hyperkalemia
What is the normal duration of the P wave in an ECG?
Less than 0.12 seconds
What is the normal speed at which an ECG machine records heart beats over time?
25mm/s
What is the duration of the PR interval in an ECG when set at two times normal standardization?
0.12-0.20 seconds
What is the standard speed calibration for a properly calibrated ECG machine?
1 mV signal produces a 10 mm deflection
What is the duration range for the onset of the P wave to the start of the QRS complex in lead II of an ECG?
0.12-0.20 seconds
What is the normal amplitude of ST-elevation in an ECG?
1mv or 10 mm or 2 large squares
Test your knowledge of electrocardiogram basics and components, including the electrical phases of the heart, ECG device parts, and the important considerations when performing ECGs such as date/time, patient details, speed, and voltage.
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