Nitrate Quiz: Can You Manage Chest Pain?

1. What is the mechanism of nitrate metabolism in the body?

Hepatic metabolism by mitochondrial enzymes

Renal excretion unchanged

Purely biliary elimination

No metabolism; excreted intact in urine

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5. Which patient population should receive nitrates with extreme caution or not at all?

Elderly patients with hypertension

Patients with severe hypotension or right ventricular infarction

Diabetic patients on insulin

Patients with mild renal impairment

6. A patient with right ventricular infarction is prescribed nitrates. What is the primary concern?

Nitrates are absolutely safe in this population

Nitrate-induced hypotension may critically reduce RV perfusion pressure

Nitrates increase right ventricular afterload

Nitrates cause reflex tachycardia in RV infarction

7. Nitrates cause vasodilation primarily through which mechanism?

Alpha-adrenergic blockade

Release of nitric oxide, activating guanylate cyclase

Direct stimulation of smooth muscle contraction

Inhibition of the renin-angiotensin system

8. When should a patient call emergency services after taking sublingual nitroglycerin?

After the first tablet is taken

If chest pain persists after 3 doses over 15 minutes

Immediately, without waiting for nitrate effect

Only if pain is accompanied by nausea

9. Isosorbide mononitrate differs from isosorbide dinitrate in what way?

It has no nitrate tolerance risk

It requires hepatic bioconversion and has more consistent blood levels

It is only available intravenously

It cannot be combined with other cardiac drugs

10. A patient on transdermal nitrate patches reports dizziness upon standing. What is the likely cause?

Hypertension from nitrate use

Orthostatic hypotension from vasodilation

Elevated intracranial pressure

Nitrate toxicity to the nervous system

11. How do nitrates relieve anginal chest pain?

Increase myocardial oxygen demand

Cause vasodilation of coronary and peripheral vessels

Reduce heart rate and contractility only

Block calcium channels in cardiac tissue

12. Long-acting nitrates are typically used for which clinical indication?

Acute MI management

Prevention of anginal episodes in chronic stable angina

Emergency hypertensive crisis

Acute pulmonary edema only

13. Sublingual nitroglycerin should be taken how often for acute angina relief?

Every 4-6 hours as needed

One tablet every 5 minutes, up to 3 doses over 15 minutes

One tablet once daily

Two tablets simultaneously for faster action

14. Which physiologic effect of nitrates helps reduce preload on the heart?

Increased systemic vascular resistance

Venodilatation decreasing venous return

Increased cardiac contractility

Reduced renal blood flow

15. A patient reports severe headache after sublingual nitroglycerin. What is the most appropriate nursing action?

Discontinue all nitrate therapy immediately

Reassure patient; headache is common and may decrease with continued use

Administer acetaminophen and continue monitoring

Switch to a different nitrate formulation without physician consultation

16. Nitrates are contraindicated in patients taking which medication class?

ACE inhibitors

Phosphodiesterase-5 inhibitors (e.g., sildenafil)

Beta-blockers

Statins

17. How should nitrate tolerance be prevented in a patient on chronic nitrate therapy?

Increase the dose daily

Provide a nitrate-free interval of 10-14 hours daily

Combine nitrates with aspirin only

Rotate nitrate formulations every week

18. What is nitrate tolerance and when does it typically develop?

Increased effectiveness after prolonged use

Loss of antianginal efficacy with continuous exposure, usually after 12-24 hours

An allergic reaction to nitrate compounds

Accumulation of nitrates in kidney tissue

19. Which nitrate formulation has the longest duration of action?

Sublingual nitroglycerin

Isosorbide dinitrate oral

Isosorbide mononitrate extended-release

Transdermal nitroglycerin patch