Florida State Paramedic Practice Exam

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What type of block is indicated by a prolonged PR interval?

Complete heart block
First degree heart block
Second degree heart block
Third degree heart block

The correct answer is: First degree heart block

A prolonged PR interval is indicative of first-degree heart block. This condition means that there is a delay in the conduction through the atrioventricular (AV) node, resulting in a longer-than-normal time for the electrical impulse to travel from the atria to the ventricles. In a normal ECG, the PR interval is typically between 120 to 200 milliseconds. When it exceeds 200 milliseconds consistently, it signifies first-degree heart block. First-degree heart block is generally considered benign and often does not cause any symptoms or require treatment. It is essential to assess the PR interval on an ECG to confirm the diagnosis accurately. Other types of heart block, such as second-degree and third-degree heart blocks, involve varying degrees of blockage and can have more significant clinical implications, including potential for more severe symptoms and the need for treatment, such as the placement of a pacemaker.