Heart Physiology Flashcards by Dr. Nic

Q

In an ECG, what does the P waveform represent?

A

First half - stimulation of right atrium

Second half - stimulation of left atrium

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Q

In an ECG, what does the PR Interval represent?

A

Depolarization of right and left atria

Spread of the impulse through the AV node

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Q

In an ECG, what does the QRS complex represent?

A

Spread of electrical impulse through the ventricles

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Q

In an ECG, what does the ST Interval represent?

A

Ventricular Systole (contraction)

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Q

In an ECG, what does the T wave represent?

A

Repolarization of ventricular contractile fibers

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Q

What is the graph labeled A measuring?

A

Electrical impulse (ECG)

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Q

What is the graph labeled B measuring?

A

Pressure

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Q

What is the graph labeled C measuring?

A

Ventricular Volume

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Q

What is the stage labeled 1?

A

Atrial Contraction and Ventricular Filling

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Q

What is the stage labeled 2?

A

Isovolumetric Contraction

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Q

What is the stage labeled 3?

A

Ventricular Ejection

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Q

What is the stage labeled 4?

A

Isovolumetric Relaxation

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Q

What is the stage labeled 5?

A

Atrial relaxation and ventricular filling

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Q

What does the green line (D) represent?

A

Left Atrium

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Q

What does the red line (E) represent?

A

Aorta

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Q

What does the blue line (F) represent?

A

Left Ventricle

Q

What does the dip in the red line (G) represent?

A

Dicrotic notch

Blood pushing back against the valve that did not make it over the aorta

Q

What does the level at H represent?

A

End-Diastolic Volume

Q

What does the level at I represent?

A

End-Systolic Volume

Q

What does this ECG reading indicate?

A

Normal at 80 BPM

Q

What does this ECG reading indicate?

A

Sinus Bradycardia at 40 BPM

Q

What does this ECG reading indicate?

A

Sinus Tachycardia at 115 BPM

Q

What does this ECG reading indicate?

A

Premature Ventricular Complex (PVC)

Q

What does this ECG reading indicate?

A

Ventricular Tachycardia (VT)

Q

What does this ECG reading indicate?

A

Ventricular Fibrillation (VF)

Q

What does this ECG reading indicate?

A

Asystole

Q

What are the pulse points of the human body?

A

Temporal Artery

Facial Artery

Carotid Artery

Brachial Artery (bicep)

Radial Artery (wrist)

Femoral Artery (upper inner thigh)

Popliteal Artery (back of knee)

Posterior Tibial Artery (ankle)

Dorsalis Pedis Artery (top of foot)

Q

What is stroke volume?

A

Blood pumped per beat

Q

What is cardiac output?

A

Blood pumped per minute

Q

What is the order of the conduction system?

A

Sinoatrial (SA) node

AV node

AV bundle

Right and left bundle branches

Purkinje fibers