Why is dual antiplatelet therapy (DAPT) considered the standard of care in acute coronary syndrome?

Platelets are activated via multiple pathways, including COX-1 and P2Y12 . Using agents like aspirin and a P2Y12 inhibitor blocks multiple activation signals simultaneously, significantly increasing the effectiveness of preventing thrombus enlargement compared to monotherapy.

What is the primary mechanism by which aspirin prevents platelet aggregation?

Aspirin irreversibly inhibits COX-1 , preventing the formation of thromboxane A2 . Because platelets lack a nucleus, they cannot synthesize new COX-1 enzymes, effectively disabling their ability to aggregate for the remainder of their 7-10 day lifespan.

Why is prasugrel contraindicated in patients with a history of stroke or TIA?

Prasugrel is a highly potent P2Y12 inhibitor associated with a significantly higher risk of serious bleeding. Clinical trials demonstrated that the risk of intracranial hemorrhage in patients with a prior stroke outweighs the potential cardiovascular benefits of the drug.

What is the paradoxical nature of Heparin-Induced Thrombocytopenia (HIT) ?

Although HIT presents with a drop in platelet count, it is a prothrombotic disorder , not a bleeding disorder. The immune system forms antibodies against the heparin-PF4 complex , which then activate platelets, leading to widespread thrombosis rather than hemorrhage.

In the context of STEMI , what is the 'door-to-balloon' time goal for PCI and why?

The goal is ≤ 90 minutes . This timeframe is critical because time is muscle ; delayed reperfusion leads to irreversible myocardial necrosis and permanent loss of cardiac function.

Why do statins possess pleiotropic effects beyond their ability to lower LDL cholesterol?

Beyond upregulating hepatic LDL receptors , statins promote plaque stabilization and reduce vascular inflammation. These mechanisms provide cardiovascular protection and event reduction that exceed the benefits attributed solely to cholesterol lowering.

How do PCSK9 inhibitors achieve superior LDL-lowering efficacy compared to statins?

PCSK9 inhibitors prevent the degradation of LDL receptors on the surface of liver cells. By keeping more receptors available to clear circulating LDL, these agents can achieve 50-70% reductions in LDL levels.

Explain the neurohormonal cycle that drives the progression of chronic heart failure.

Reduced cardiac output triggers SNS and RAAS activation to maintain blood pressure. Chronic stimulation leads to detrimental cardiac remodeling , including fibrosis, hypertrophy, and chamber dilation, which further weakens the heart and worsens the failure.

Which four medication classes constitute the Fantastic Four for mortality reduction in HFrEF?

ARNI (Angiotensin Receptor-Neprilysin Inhibitor) Evidence-based Beta-blockers MRA (Mineralocorticoid Receptor Antagonist) SGLT2 inhibitors

What distinguishes the therapeutic role of loop diuretics from the Fantastic Four in heart failure?

Loop diuretics are used to manage fluid overload and provide significant symptom relief, but they do not reduce mortality . In contrast, the Fantastic Four are foundational therapies specifically proven to improve survival.

What is the difference between White Coat Hypertension and Masked Hypertension ?

White Coat Hypertension is elevated BP in the clinical setting but normal at home, while Masked Hypertension is normal office readings despite elevated BP in daily life. Both represent inaccuracies in traditional blood pressure measurement.

When is the addition of spironolactone indicated in the treatment of hypertension?

Spironolactone is indicated for resistant hypertension , defined as blood pressure that remains above goal despite adherence to a regimen consisting of three different antihypertensive drug classes, one of which is a diuretic.

What is the clinical significance of the 'first-dose phenomenon' with alpha-1 blockers like prazosin?

These agents can cause profound orthostatic hypotension and syncope after the initial dose. Patients must be counseled to take the first dose at bedtime to avoid injury from sudden fainting.

Why is the abrupt withdrawal of clonidine dangerous?

Clonidine is a central alpha-2 agonist . Abrupt discontinuation can trigger rebound hypertension due to a surge in sympathetic outflow that was previously suppressed by the medication.

What specific adverse effect profile identifies minoxidil among direct vasodilators?

Minoxidil is known for causing significant fluid retention (requiring concomitant diuretic use) and hypertrichosis , a reversible increase in body hair growth often used as a mnemonic for the drug.

Pharmacology And Pathophysiology Of Cardiovascular Disease And Hypertension Management Flashcards

Browse 1 flashcard sets with 15 cards for Pharmacology And Pathophysiology Of Cardiovascular Disease And Hypertension Management in Medicine. Study for free or create your own with AI.

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Pharmacology and Pathophysiology of Cardiovascular Disease and Hypertension Management

This deck focuses on the pathophysiology and pharmacological management of acute coronary syndrome, heart failure, and hypertension. Students will learn to apply evidence-based clinical reasoning to guide therapy selection.

15 cards

intermediate

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by @vanessa_powell

Q: Why is dual antiplatelet therapy (DAPT) considered the standard of care in acute co...

Q: What is the primary mechanism by which aspirin prevents platelet aggregation?

Q: Why is prasugrel contraindicated in patients with a history of stroke or TIA?

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