A client reports smelling a strong burning odor even though no source is present in the environment.
Which alteration in sensory perception is the client experiencing?
Anosmia.
Parosmia.
Hyposmia.
Olfactory hallucination.
The Correct Answer is D
Choice A rationale
Anosmia is the total loss of the sense of smell. It is a quantitative deficit where the patient cannot perceive any odors at all, regardless of whether a source is present. This condition is often caused by head trauma, nasal polyps, or viral infections that damage the olfactory nerves. Because the client is reporting the presence of a strong odor rather than the absence of smell, anosmia is not the correct term for this specific sensory experience.
Choice B rationale
Parosmia is a distortion of the sense of smell where a real, existing odor is perceived differently than it actually is. For example, a person might smell a flower but perceive it as the scent of chemicals or rotting meat. In this scenario, the client is smelling something when there is no environmental trigger or source present at all. Since there is no actual odor to be distorted, the experience is better classified as a hallucination than parosmia.
Choice C rationale
Hyposmia is a reduced ability to detect odors, meaning the patient's sensitivity to smells is lower than normal. Similar to anosmia, this is a quantitative change in the volume of sensory input rather than a qualitative change in the nature of the perception. The client's report of a strong, specific burning odor indicates that they are perceiving a sensation that does not exist in reality, which is not a symptom of having a diminished sense of smell.
Choice D rationale
Olfactory hallucination, also known as phantosmia, is the perception of a smell when no actual odorant is present in the environment. These "phantom smells" can be pleasant or foul, such as the burning odor described by the client. This phenomenon is often associated with neurological conditions like temporal lobe epilepsy, migraines, or head injuries. Because the perception occurs in the absence of any external stimulus, it is correctly identified as a sensory hallucination of the olfactory system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Optic neuritis involves inflammation of the optic nerve, frequently associated with multiple sclerosis. While it results in vision loss and pain with eye movement, it does not typically manifest as flashes of light or the classic curtain sensation. The pathophysiology is demyelination rather than mechanical separation. Consequently, the clinical presentation differs significantly from the sudden mechanical detachment of the sensory retina from the vascular supply provided by the underlying choroid layer.
Choice B rationale
Cataracts involve the progressive degeneration and clouding of the crystalline lens, which impairs light refraction and causes blurred vision. This is a slow, degenerative process related to protein aggregation within the lens fibers. It does not involve the sudden vitreous traction or retinal tearing associated with flashes of light. Pathophysiologically, lens opacity blocks light transmission to the retina but does not cause the retina itself to physically peel away from its anatomical base.
Choice C rationale
Retinal detachment occurs when the thin layer of light sensitive tissue, the neurosensory retina, physically pulls away from the retinal pigment epithelium and the underlying choroid. The choroid provides essential oxygen and nutrients; without this contact, photoreceptors begin to die. The flashes of light, or photopsia, result from vitreous traction on the retina, while the curtain effect represents the actual physical separation and loss of visual field in the detached area.
Choice D rationale
Increased intraocular pressure is the hallmark of glaucoma, where the compression of the optic nerve leads to progressive peripheral vision loss. Normal intraocular pressure ranges from 10 to 21 mmHg. When pressure exceeds these limits, it causes mechanical and ischemic damage to the nerve fibers. However, this condition does not typically cause the sudden onset of flashes or the sensation of a moving curtain, which are indicative of an acute rhegmatogenous or tractional event.
Correct Answer is D
Explanation
Choice A rationale
Water remains evenly distributed between compartments only when the intravenous fluid administered is isotonic, such as 0.9 percent normal saline. Isotonic solutions have an osmolality similar to that of intracellular and extracellular fluids, resulting in no net movement of water across the cell membrane. Hypertonic solutions, by definition, have a higher solute concentration than the cytoplasm of the cells, which creates an osmotic gradient that necessitates the movement of water.
Choice B rationale
Water moves into cells, causing them to swell, when a hypotonic solution is administered. Hypotonic fluids, such as 0.45 percent normal saline, have a lower osmolality than the fluid inside the cells. This causes water to shift from the intravascular space into the intracellular space to equalize concentrations. In the case of hypertonic saline, the concentration of solutes in the blood is higher than in the cells, which prevents water from entering.
Choice C rationale
Sodium does not passively diffuse into cells in significant quantities to equalize osmotic pressure because the cell membrane is selectively permeable and utilizes the sodium-potassium pump to maintain gradients. While some movement occurs, the primary mechanism for balancing the osmotic pressure difference created by hypertonic saline is the movement of water. Osmosis dictates that the solvent moves toward the higher solute concentration, rather than the solute moving to fill the cells.
Choice D rationale
Hypertonic saline has a higher osmolality than the intracellular fluid. When this solution is introduced into the extracellular space, it creates an osmotic pull that draws water out of the cells and into the blood vessels. This process causes the cells to shrink, a process known as crenation. This shift helps expand the intravascular volume in cases of severe dehydration but must be monitored closely to prevent cellular damage and fluid overload.
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