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Hyperventilation-induced T Wave Inversion - ECG

Hyperventilation induced T wave inversion

Normal T Wave
Hyperventilation
Inverted T Waves and Hyperventilation
Differential Diagnosis

12-lead ECG

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Normal T Wave

Concordant T Wave

ECG abnormal disconcordance T wave, positive QRS, negative inverted T wave

Disconcordant T Wave

The T wave is the most variable wave on the ECG

It represents ventricular repolarization
It is low and wide

It is concordant (has the same polarity as the QRS)

Positive QRS - positive T wave
Negative QRS - negative T wave

It is positive (I, II, V3-V6)

It may be isolated negative (III, aVL)

It is negative (aVR)
Amplitude

In limb leads, < 5mm
In chest leads, < 15mm

For ECG diagnosis, the dynamics of the T wave is important

If the T wave remains the same - it often does not indicate a serious condition
If the T wave changes - it often indicates a serious condition (ischemia)

Hyperventilation

During hyperventilation, more carbon dioxide is exhaled

than is produced in the body

Respiratory alkalosis occurs (pH increases in the blood)

There is a change in mineral concentration

Ionized calcium decreases

Muscular excitability increases and tetanic contractions occur

Obstetric hand sign – Trousseau's sign
Carpopedal spasms – Chvostek's sign

An increase in pH by 0.1 causes a decrease in potassium by approximately 0.5mmol/l

Hyperventilation thus causes hypokalemia, which leads to EKG changes:

If serious conditions are excluded (e.g., pulmonary embolism)

then treatment of hyperventilation includes:

Calming the patient
Breathing into a plastic bag (the patient rebreathes carbon dioxide)

Inverted T Waves and Hyperventilation

Hyperventilation causes (temporary changes) on an EKG:

Inverted T waves

Occur mainly in precordial leads (V1-V6)

Prolonged QT interval

The mechanism of EKG changes is primarily transient hypokalemia

Which results from hyperventilation-induced respiratory alkalosis (Blood pH increases)
EKG changes persist for approximately 1 minute after hyperventilation

Differential Diagnosis

Ischemia in the anterior leads (V1-V6)

Ischemia also causes inverted T waves
These T waves are often associated with ST depressions

Arrhythmogenic Right Ventricular Dysplasia (ARVD)

ARVD also causes inverted T waves (V1-V3) without dynamics, but ARVD also has

Persistent Juvenile T Waves

Are inverted T waves (V1-V3) that are without dynamics
Persist from birth to adulthood

Persistent Juvenile T Waves

It involved a 24-year-old woman who was frightened and hyperventilating, and she had no structural heart disease
Inverted T waves (V1-V5)
After calming the patient, these T waves resolved

ECG persistent juvenile T wave pattern, african-american female

Persistent Juvenile T Waves

It involved a 32-year-old African-American woman with no structural heart disease

The patient was at a routine check-up and had no subjective complaints

She had the same T waves (V1-V4) on an ECG from 7 years ago
Inverted T waves (V1-V4)

Depth < 3mm

The T waves did not change, indicating persistent juvenile T waves

These are typically found only in leads V1-V3, rarely in V4

ECG (V1-V3) arrhythmogenic right ventricular hypertrophy, epsilon wave, inverted T wave

Arrhythmogenic Right Ventricular Dysplasia

Epsilon wave in all leads

It is characteristic of arrhythmogenic right ventricular dysplasia

Negative T waves (V1-V3), also V4-V6
Right ventricular hypertrophy and overload

R/S ratio (V1) ≥ 1
Descending ST segment and Negative T waves (V1-4) (II, III, aVF)

Heart stenosis: Circumflex branch of left coronary artery (LCx), Anterior interventricular branch of left coronary artery (LAD)

ECG ischemic inverted T waves, unstable angina pectoris, stenosis LAD, LCx

Inverted Ischemic T Waves and Unstable Angina Pectoris

The patient had unstable angina pectoris due to stenosis of the LAD and LCx

ST depression (V4-V6)
Inverted T waves (V2-V6)
After stent placement (recanalization), the T waves normalized later

For acute subendocardial ischemia, the following are characteristic

ST depressions and Inverted T waves (at least in 2 contiguous leads)

The patient had acute coronary syndrome

Sources

ECG from Basics to Essentials Step by Step
litfl.com
ecgwaves.com
metealpaslan.com
medmastery.com
uptodate.com
ecgpedia.org
wikipedia.org
Strong Medicine
Understanding Pacemakers

Home /

Hyperventilation-induced T Wave Inversion - ECG

Hyperventilation induced T wave inversion

Normal T Wave
Hyperventilation
Inverted T Waves and Hyperventilation
Differential Diagnosis

12-lead ECG

Smartwatch ECG

Have a doctor’s or smartwatch ECG?

Upload your 12-lead, smartwatch or smart device ECG.
Get a physician’s report within 24 hours.

Get my ECG reviewed →

Reviewed by a physician · Your questions answered · Not AI

Normal T Wave

The T wave is the most variable wave on the ECG

It represents ventricular repolarization
It is low and wide

It is concordant (has the same polarity as the QRS)

Positive QRS - positive T wave
Negative QRS - negative T wave

It is positive (I, II, V3-V6)

It may be isolated negative (III, aVL)

It is negative (aVR)
Amplitude

In limb leads, < 5mm
In chest leads, < 15mm

For ECG diagnosis, the dynamics of the T wave is important

If the T wave remains the same - it often does not indicate a serious condition
If the T wave changes - it often indicates a serious condition (ischemia)

Concordant T Wave

Disconcordant T Wave

Hyperventilation

During hyperventilation, more carbon dioxide is exhaled

than is produced in the body

Respiratory alkalosis occurs (pH increases in the blood)

There is a change in mineral concentration

Ionized calcium decreases

Muscular excitability increases and tetanic contractions occur

Obstetric hand sign – Trousseau's sign
Carpopedal spasms – Chvostek's sign

An increase in pH by 0.1 causes a decrease in potassium by approximately 0.5mmol/l

Hyperventilation thus causes hypokalemia, which leads to EKG changes:

If serious conditions are excluded (e.g., pulmonary embolism)

then treatment of hyperventilation includes:

Calming the patient
Breathing into a plastic bag (the patient rebreathes carbon dioxide)

Inverted T Waves and Hyperventilation

Hyperventilation causes (temporary changes) on an EKG:

Inverted T waves

Occur mainly in precordial leads (V1-V6)

Prolonged QT interval

The mechanism of EKG changes is primarily transient hypokalemia

Which results from hyperventilation-induced respiratory alkalosis (Blood pH increases)
EKG changes persist for approximately 1 minute after hyperventilation

Differential Diagnosis

Ischemia in the anterior leads (V1-V6)

Ischemia also causes inverted T waves
These T waves are often associated with ST depressions

Arrhythmogenic Right Ventricular Dysplasia (ARVD)

ARVD also causes inverted T waves (V1-V3) without dynamics, but ARVD also has

Persistent Juvenile T Waves

Are inverted T waves (V1-V3) that are without dynamics
Persist from birth to adulthood

Persistent Juvenile T Waves

It involved a 24-year-old woman who was frightened and hyperventilating, and she had no structural heart disease
Inverted T waves (V1-V5)
After calming the patient, these T waves resolved

Persistent Juvenile T Waves

It involved a 32-year-old African-American woman with no structural heart disease

The patient was at a routine check-up and had no subjective complaints

She had the same T waves (V1-V4) on an ECG from 7 years ago
Inverted T waves (V1-V4)

Depth < 3mm

The T waves did not change, indicating persistent juvenile T waves

These are typically found only in leads V1-V3, rarely in V4

Arrhythmogenic Right Ventricular Dysplasia

Epsilon wave in all leads

It is characteristic of arrhythmogenic right ventricular dysplasia

Negative T waves (V1-V3), also V4-V6
Right ventricular hypertrophy and overload

R/S ratio (V1) ≥ 1
Descending ST segment and Negative T waves (V1-4) (II, III, aVF)

Inverted Ischemic T Waves and Unstable Angina Pectoris

The patient had unstable angina pectoris due to stenosis of the LAD and LCx

ST depression (V4-V6)
Inverted T waves (V2-V6)
After stent placement (recanalization), the T waves normalized later

For acute subendocardial ischemia, the following are characteristic

ST depressions and Inverted T waves (at least in 2 contiguous leads)

The patient had acute coronary syndrome

Sources

ECG from Basics to Essentials Step by Step
litfl.com
ecgwaves.com
metealpaslan.com
medmastery.com
uptodate.com
ecgpedia.org
wikipedia.org
Strong Medicine
Understanding Pacemakers