A patient of acute myocardial infarction being treated in intensive care unit developed left ventricular failure with raised central venous pressure. It was decided to use nitroglycerine. Which route of administration would be most suitable?
**Core Concept**
Nitroglycerine is a vasodilator that acts on the venous system to decrease preload, reducing the workload on the heart and increasing cardiac output in the context of heart failure. This is particularly useful in left ventricular failure with raised central venous pressure.
**Why the Correct Answer is Right**
In the setting of acute myocardial infarction with left ventricular failure, intravenous (IV) nitroglycerine is the most effective route of administration. IV administration allows for rapid onset of action and precise control of dosage, which is critical in this high-stakes clinical situation. Nitroglycerine works by releasing nitric oxide, which stimulates guanylate cyclase to increase cyclic guanosine monophosphate (cGMP) levels, leading to smooth muscle relaxation and vasodilation.
**Why Each Wrong Option is Incorrect**
**Option A:** Sublingual administration is typically used for acute angina, but it's less effective and slower to act than IV administration in the setting of left ventricular failure.
**Option B:** Transdermal patches are used for chronic management of angina but are not suitable for acute left ventricular failure due to delayed onset of action.
**Option C:** Oral administration is not suitable for acute left ventricular failure due to delayed onset of action and variability in absorption.
**Clinical Pearl / High-Yield Fact**
In the intensive care unit, IV nitroglycerine is a key medication for managing acute heart failure with raised central venous pressure. However, be cautious of its potential side effects, including hypotension and tachyarrhythmias.
**Correct Answer:** C.