The client asks the nurse how most medications for dysrhythmias work. What is the best response by the nurse?
1. "Blocking potassium, sodium, or calcium ion channels is the primary way to prevent or terminate dysrhythmias."
2. "Most medications for dysrhythmias shorten the refractory period."
3. "These medications will lower your blood pressure, which will change the rhythm of your heart."
4. "The mechanism of these drugs is unknown."
Correct Answer: 1
Rationale 1: Blocking potassium, sodium, or calcium ion channels is the primary pharmacologic strategy used to prevent or terminate dysrhythmias.
Rationale 2: "Most medications for dysrhythmias shorten the refractory period" is incorrect because some drugs for dysrhythmias will increase the refractory period.
Rationale 3: "These medications will lower your blood pressure, which will change the rhythm of your heart" is incorrect because many antidysrhythmic medications block sodium, potassium and calcium ion channels.
Rationale 4: "The mechanism of these drugs is unknown" is incorrect because it is known that the main way they work is to block potassium, sodium, or calcium ion channels.
Global Rationale: Blocking potassium, sodium, or calcium ion channels is the primary pharmacologic strategy used to prevent or terminate dysrhythmias. "Most medications for dysrhythmias shorten the refractory period" is incorrect because some drugs for dysrhythmias will increase the refractory period. "These medications will lower your blood pressure, which will change the rhythm of your heart" is incorrect because many antidysrhythmic medications block sodium, potassium and calcium ion channels. "The mechanism of these drugs is unknown" is incorrect because it is known that the main way they work is to block potassium, sodium, or calcium ion channels.
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