Think you are ready for the AGACNP (Adult-Gerontology Acute Care Nurse Practitioner) exam? Our deck rates 505 of its 1020 flashcards as hard — testing concepts like ROS, Reactive Oxygen Species, MPT, Mitochondrial Permeability Transition. Try the free samples below; if they feel comfortable, you are in good shape.
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During a prolonged cardiac arrest, cellular ATP levels drop significantly. What is the immediate consequence on electrolyte balance and cellular morphology?
Show answer →ATP depletion causes failure of the Na+/K+-ATPase pump. Sodium accumulates intracellularly, and potassium exits. Water follows sodium (osmosis), leading to acute cellular swelling (hydropic degeneration). Failure of the Ca2+ pump also leads to calcium influx, activating destructive enzymes (proteases, nucleases). ANCC Focus: Early reversible injury is characterized by swelling; irreversible injury is marked by membrane rupture and mitochondrial density.
A patient undergoes PCI for an STEMI. Following successful restoration of blood flow, the patient experiences reperfusion arrhythmias and localized tissue damage. What mechanism explains this phenomenon?
Show answer →Ischemia-Reperfusion Injury. Mechanism: Re-oxygenation leads to a burst of Reactive Oxygen Species (ROS) like superoxide and hydroxyl radicals. These cause lipid peroxidation of membranes and mitochondrial pore opening. Calcium overload also occurs as flow returns. Exam Tip: This explains why restoring flow can paradoxically cause further damage. In the acute care setting, this is a key consideration in MI, stroke, and organ transplant.
Which cellular death process is characterized by programmed activation of caspases, absence of inflammation, and preservation of the plasma membrane?
Show answer →Apoptosis. It is an energy-dependent (ATP-requiring) process involving cell shrinkage, chromatin condensation, and formation of apoptotic bodies that are phagocytized. Clinical Pearl: Unlike necrosis, apoptosis does not cause an inflammatory response because the cell contents are not leaked into the extracellular space. ANCC focuses on the clean nature of apoptosis versus the messy (pro-inflammatory) nature of necrosis.
What are the three primary mechanisms by which Reactive Oxygen Species (ROS) cause cellular injury in the setting of critical illness or sepsis?
Show answer →1. Lipid peroxidation: Destruction of polyunsaturated lipids, damaging plasma and organelle membranes. 2. Protein carbonylation: Alteration of protein folding and enzyme activity, leading to metabolic failure. 3. DNA fragmentation: Causing mutations or triggering apoptosis. Sepsis involves a massive release of ROS from neutrophils (oxidative burst), which overwhelms endogenous antioxidants like glutathione and superoxide dismutase.
In states of severe cellular hypoxia, the Mitochondrial Permeability Transition (MPT) pore opens. What is the consequence of this event on the cell's fate?
Show answer →Opening of the MPT pore leads to the loss of mitochondrial membrane potential, resulting in the total failure of oxidative phosphorylation and ATP depletion (irreversible injury). Furthermore, it allows the leakage of Cytochrome C into the cytosol, which triggers the intrinsic pathway of apoptosis via caspase activation. This represents a critical point of no return where the cell is committed to death.
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Try 30 free AGACNP cards first505 of the 1020 flashcards in the AGACNP deck carry a "hard" difficulty rating. 5 free samples are on this page.
Difficulty ratings describe our deck, not the official exam. Practicing above test level builds a margin of safety — check the official ANCC materials for representative difficulty.
Assessment
50 cards
Basics
80 cards
Diagnostics
150 cards
Management
440 cards
Pathology
30 cards
Pharmacology
130 cards
Physiology
40 cards
Procedures
90 cards
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