Amlodipine is a calcium channel blocker that decreases the oxygen needs of the heart by a negative inotropic effect. Show Explanation: Inotropic effect is the force of the heart contraction, chronotropic is the heart rate, and dromotropic is the conduction through the heart. Calcium travels to these cells through special channels. Calcium channel blockers inhibit calcium from moving across cell membranes. The effects of this inhibition on the cardiovascular system are decreased contraction, depression of impulse formation (automaticity), and slowing of conduction velocity. These have the effect of decreasing the oxygen needs of the heart. Calcium channel blockers also cause arteriolar dilation, decreasing the afterload. Calcium channel blockers are used in chronic stable angina when the patient cannot tolerate beta-blockers, or if the symptoms are not adequately controlled with this therapy (ACC/AHA, 2002). The calcium channel blockers used for chronic stable angina are verapamil (Calan), amlodipine (Norvasc), bepridil (Vascor), diltiazem (Cardizem), nicardipine (Cardene), and nifedipine (Procardia). Which finding indicates to the nurse that a patient is experiencing digoxin toxicity?Signs of toxicity include blurred vision, nausea, and visual impairment (such as seeing green and yellow halos). A low potassium level can increase the risk of digoxin toxicity. If a patient has digoxin toxicity, severe bradycardia and even death can occur if not treated promptly.
Which findings are characteristic of digoxin toxicity?The clinical features of toxicity are often non-specific. They commonly include lethargy, confusion and gastrointestinal symptoms (anorexia, nausea, vomiting, diarrhoea and abdominal pain). Visual effects (blurred vision, colour disturbances, haloes and scotomas) are rarer in contemporary practice.
Which of the following symptoms are associated with digoxin toxicity select all that apply?What are the symptoms of digoxin toxicity?. Lack of appetite, nausea, vomiting, or diarrhea.. Headache, confusion, anxiety, or hallucinations.. Restlessness, weakness, or depression.. Changes in vision such as blurred vision or seeing halos around bright objects.. Which findings are consistent with digitalis toxicity?These are symptoms of digitalis toxicity:. Confusion.. Irregular pulse.. Loss of appetite.. Nausea, vomiting, diarrhea.. Fast heartbeat.. Vision changes (unusual), including blind spots, blurred vision, changes in how colors look, or seeing spots.. |
Which finding indicates to the nurse that a patient is experiencing digoxin toxicity? quizlet
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