EET (Exercise Tolerance Test )
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Transcript of EET (Exercise Tolerance Test )
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WHAT IS ETT?
• AN EXERCISE TOLERANCE TEST OR STRESS TEST RECORDS THE HEART'S ELECTRICAL ACTIVITY (RATE AND
RHYTHM) DURING EXERCISE.
• IS ONE OF THE COMMONEST FORMS OF STRESS TESTS USED TO INDUCE PROVOKABLE MYOCARDIAL
ISCHEMIA FOR DIAGNOSTIC EVALUATION OF CORONARY ARTERY DISEASE.
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EQUIPMENT REQUIRED
• TREADMILL MACHINE OR EXERCISE BIKE
• 12-LEADS ELECTROCARDIOGRAPH (ECG) MACHINE
• STOP WATCH
• LEADS
• CLIPS
• STICKING TAPE
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PROCEDURE
• A PROGRESSIVE AND MAXIMUM EXERCISE TEST (STARTING FROM A WALKING PACE AND GRADUALLY
INCREASING PACE) IS PERFORMED WHILE THE ELECTRICAL IMPULSES FROM THE HEART TISSUE ARE
RECORDED BY SURFACE ELECTRODES PLACES ON THE CHEST WALL.
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ETT POINTS
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WHAT DOES ETT DO?
IN ETT, (ALSO KNOW AS STRESS TEST), IT MEASURES:
• HEART RATE
• BLOOD PRESSURE
• ECG
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ETT
• PATIENT IS REQUESTED TO DO EXERCISE ON A TREADMILL MACHINE.
• DURATION 6 TO 10 MINUTES
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Useful in diagnosis of…
• Cardiac Arrhythmias
• Myocardial ischemia and infarction
• Pericarditis
• Chamber hypertrophy
• Electrolyte disturbances
• Drug effects and toxicity
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CALCULATING HEART RATE
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Normal H.R. 60-90 bpm
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What is an ECG?
An ECG is the recording (gram)
of the electrical activity(electro) generated by the cells of the heart(cardio) that reaches the body surface.
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ECG Leads
Leads are electrodes which measure the difference in electrical potential between either:
1. Two different points on the body (bipolar
leads)
2. One point on the body and a virtual reference
point with zero electrical potential, located in
the center of the heart (unipolar leads)
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ECG Leads
The standard ECG has 12 leads:
The axis of a particular lead represents the viewpoint from
which it looks at the heart.
3 Standard Limb Leads
3 Augmented Limb Leads
6 Precordial Leads
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Basics
ECG graphs:
–1 mm squares
–5 mm squares
Paper Speed:
–25 mm/sec standard
Voltage Calibration:
–10 mm/mV standard
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ECG Paper: Dimensions5 mm
1 mm
0.1 mV
0.04 sec
0.2 sec
Speed = rate
Voltage
~Mass
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+-
RA
RA
LL+
+
--LA
LL
LA
LEAD II
LEAD I
LEAD III
Remember, the RL
is always the ground
• By changing the
arrangement of which
arms or legs are
positive or negative,
three unipolar leads (I,
II & III ) can be derived
giving three "pictures"
of the heart's electrical
activity from 3 angles.
Leads I, II, and III
I
II III
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