Cardiac notes

🫀 Cardiac Sonography — University Study Notes

1. What is Cardiac Sonography?

Cardiac sonography is the use of ultrasound to create moving images of the heart.

A cardiac sonographer uses an echocardiography machine and a small device called a transducer/probe.

What does the sonographer look at?

• Heart chambers

• Heart valves

• Heart muscle

• Blood flow

• Heart contractions

• Size and shape of the heart

• Some abnormalities

The examination is called an echocardiogram (echo).

🫀 2. Anatomy of the Heart

You will learn the structure and position of the heart.

The 4 chambers

Important structures

Septum — wall separating the left and right sides of the heart.

Atria — upper chambers.

Ventricles — lower chambers.

Myocardium — heart muscle.

Pericardium — protective sac around the heart.

🚪 3. Heart Valves

You will study how the valves control the direction of blood flow.

The four main valves:

1. Tricuspid valve

2. Pulmonary valve

3. Mitral valve

4. Aortic valve

Think of valves like one-way doors.

They open to allow blood through and close to help prevent blood from flowing backward.

🩸 4. Blood Flow

You need to understand the route blood takes through the heart.

Simplified pathway:

Body → Right atrium → Right ventricle → Lungs → Left atrium → Left ventricle → Body

Remember:

🫁 Right side → lungs

❤ Left side → body

📡 5. Ultrasound Physics

This is an important part of university study.

You learn how ultrasound actually works.

Key concepts:

• Sound waves

• Frequency

• Wavelength

• Amplitude

• Reflection

• Refraction

• Echoes

• Doppler effect

• Ultrasound propagation

The transducer sends high-frequency sound waves into the body.

The waves bounce off structures inside the heart and return to the transducer.

The machine processes those echoes to create an image.

🔊 6. Doppler Ultrasound

Doppler is extremely important in cardiac sonography.

It helps you assess blood movement and blood flow.

You may learn about:

• Colour Doppler

• Pulsed-wave Doppler

• Continuous-wave Doppler

• Spectral Doppler

For example, Doppler can help assess how blood moves through a heart valve.

💻 7. Using the Echocardiography Machine

You will learn how to operate the ultrasound system.

You may learn how to:

• Select the correct probe

• Adjust depth

• Adjust gain

• Freeze images

• Record measurements

• Optimise image quality

• Use Doppler

• Capture specific views

• Store images and measurements

🫀 8. Echocardiographic Views

You learn how to position the transducer to obtain different views of the heart.

Some important views include:

Parasternal long-axis view

Shows structures such as the left ventricle and aortic valve.

Parasternal short-axis view

Can show the heart in cross-section.

Apical views

The probe is positioned near the apex of the heart.

You will eventually learn exact probe positions and angles in practical training.

📏 9. Measurements

Cardiac sonographers take measurements from ultrasound images.

Examples include:

• Chamber dimensions

• Wall thickness

• Valve measurements

• Blood-flow velocities

• Ventricular function

• Ejection fraction

Ejection Fraction (EF)

This is an important concept.

It describes the percentage of blood pumped out of a ventricle during each heartbeat.

A commonly used measurement is left ventricular ejection fraction (LVEF).

💓 10. Cardiac Physiology

You learn how the heart works, not just what it looks like.

Topics include:

• Heartbeat

• Electrical activity

• Cardiac cycle

• Contraction

• Relaxation

• Blood pressure

• Cardiac output

Two important terms:

Systole = the heart contracts.

Diastole = the heart relaxes and fills.

⚡ 11. ECG Basics

You may learn how to understand an electrocardiogram (ECG/EKG).

An ECG records the heart’s electrical activity.

You don’t become an ECG technician just by studying cardiac sonography, but understanding ECG information is useful when performing echocardiography.

🩺 12. Heart Conditions

You will learn how different diseases can affect the heart and what they may look like on an echocardiogram.

Examples include:

• Heart failure

• Valve disease

• Cardiomyopathy

• Congenital heart defects

• Pericardial effusion

• Some forms of pulmonary hypertension

• Abnormal chamber enlargement

The sonographer does not simply look at the screen and diagnose everything. They acquire and analyse appropriate images and measurements, which are then interpreted within the clinical team.

🧑🏽‍⚕️ 13. Patient Care

This is also a major part of the job.

You learn how to:

• Communicate with patients

• Explain the examination

• Protect patient privacy

• Position patients safely

• Maintain professionalism

• Obtain relevant clinical information

• Recognise when a patient may need assistance

You also learn about infection prevention and control.

🦺 14. Safety

You learn how to perform ultrasound examinations safely.

Topics can include:

• Ultrasound safety

• Infection control

• Equipment cleaning

• Ergonomics

• Safe patient positioning

• Workplace safety

📚 15. Other University Subjects

Depending on the university/programme, you may study subjects such as:

• Anatomy

• Physiology

• Physics

• Ultrasound physics

• Pathology

• Pharmacology basics

• Medical terminology

• Patient care

• Research methods

• Professional practice

• Ethics

• Clinical practice

🏥 16. Clinical Training

This is where things become much more practical.

You’ll eventually spend time in a clinical environment learning how to perform examinations on patients under supervision.

You can practise:

Position patient → Select probe → Obtain image → Optimise image → Take measurements → Use Doppler → Save images → Document findings

🧠 Vocabulary to Start Learning

⭐ What I’d recommend you learn first

Since you’re interested in becoming a cardiac sonographer, start with these five topics:

1. ❤ Heart anatomy
2. 🩸 Blood circulation
3. 🚪 Heart valves
4. 📡 How ultrasound works
5. 💓 Cardiac cycle

Once you understand those, Doppler and echocardiography become much easier.