A Patient's QRS Complex Is Becoming Increasingly Wider

question 2

Multiple Choice

A patient's QRS complex is becoming increasingly wider. What is occurring within the heart muscle that is reflected on this tracing?

• A)The ventricles are repolarizing.
• B)Atrial repolarization is occurring.
• C)Ventricular depolarization is prolonged.
• D)The atria depolarize and the impulse at the atrioventricular (AV) node is delayed.

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Definitions:

Variable-Interval Schedule

A schedule in which a variable amount of time must elapse between the previous and subsequent times that reinforcement is available.

Fixed Number

A concept often used in experiments or statistical analyses that refers to a constant quantity or value that does not change.

Negative Reinforcers

An aversive stimulus whose removal or avoidance following a behavior increases the likelihood of that behavior being repeated.

Aversive Stimulus

A negative or unpleasant stimulus that causes a decrease in the likelihood of a behavior being repeated.