PRN 1520 Pathophysiology EXAM 3 at South College
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Free PRN 1520 Pathophysiology EXAM 3 at South College Questions
Valvular prolapse occurs when:
- A blood clot blocks the heart valve leaflets.
- Heart valve leaflets become floppy and bulge backward.
- The heart valve becomes stiff and cannot open.
- Chordae tendineae pull the heart valve tightly closed.
Explanation
Valvular prolapse, specifically mitral valve prolapse (MVP), occurs when the leaflets of the heart valve (typically the mitral valve) become floppy and bulge backward into the atrium during systole (when the heart contracts). This can lead to incomplete closure of the valve, causing regurgitation (blood flow backward into the atrium). It's a common condition and often does not cause significant symptoms, although in some cases, it can lead to heart murmurs or complications.
A patient reports a sudden, severe headache and begins vomiting. The patient states, "This is the worst headache I have ever had in my whole life." The patient quickly becomes unresponsive. The nurse recognizes that the patient is likely experiencing:
- Multiple sclerosis
- A hemorrhagic stroke
- A seizure
- An ischemic stroke
Explanation
A hemorrhagic stroke occurs when a blood vessel in the brain ruptures, leading to bleeding (hemorrhage) within the brain. The patient’s symptoms of a sudden, severe headache (often described as the "worst headache" ever experienced), vomiting, and rapid loss of consciousness are typical of this type of stroke. The increase in intracranial pressure due to the bleeding can cause these symptoms. Hemorrhagic strokes are a medical emergency and require immediate attention to manage the bleeding and prevent further damage to brain tissue.
A client with gastroesophageal reflux disease (GERD) reports worsening symptoms when lying down after meals. What physiological factor is most likely contributing to this exacerbation?
- Hyposecretion of gastric acid
- Increased intra-abdominal pressure
- Weakness of the lower esophageal sphincter
- Delayed gastric emptying
Explanation
The lower esophageal sphincter (LES) is a muscular ring that prevents stomach contents, including acid, from refluxing into the esophagus. In GERD, the LES is weak or relaxes inappropriately, allowing gastric acid to flow back into the esophagus, particularly when lying down. This exacerbates symptoms such as heartburn and regurgitation because gravity no longer helps keep the acid in the stomach.
A patient is admitted with a stroke that occurred in the left hemisphere of the brain. The nurse would expect the patient to have weakness or paralysis:
- On neither side of the body.
- On both sides of the body.
- On the right side of the body.
- On the left side of the body.
Explanation
The left hemisphere of the brain controls the right side of the body due to the crossing of motor pathways in the brainstem (known as contralateral control). Therefore, if a stroke occurs in the left hemisphere, it will typically result in weakness or paralysis on the right side of the body. This can affect both motor functions and sensation.
Which of the following correctly lists the order of the electrical conduction system of the heart?
- Purkinje fibers - Bundle of His - AV node - SA node
- SA node - Bundle of His - Purkinje fibers - AV node
- AV node - SA node - Bundle of His - Purkinje fibers
- SA node - AV node - Bundle of His - Purkinje fibers
Explanation
The electrical conduction system of the heart follows this specific order:
1. SA node (Sinoatrial node): The "natural pacemaker" of the heart, located in the right atrium, initiates the electrical impulse.
2. AV node (Atrioventricular node): The impulse then travels to the AV node, located between the atria and ventricles, where it briefly pauses to allow the ventricles time to fill with blood.
3. Bundle of His: From the AV node, the impulse moves down to the Bundle of His, which is a pathway that leads to the right and left bundle branches.
4. Purkinje fibers: Finally, the impulse spreads through the Purkinje fibers in the ventricles, causing them to contract.
This sequence ensures the coordinated contraction of the heart, with the atria contracting first, followed by the ventricles.
A patient has been diagnosed with secondary hypertension. The nurse understands that secondary hypertension:
- Leads to extensive organ damage in most cases.
- Is known as the "silent killer."
- Will resolve when the underlying condition is treated.
- Has no known cause.
Explanation
Secondary hypertension is high blood pressure caused by an underlying health condition such as kidney disease, hormonal disorders, or medication use. The key characteristic of secondary hypertension is that it has a known cause. Once the underlying condition (like treating kidney disease or discontinuing a medication) is addressed, the blood pressure can often be controlled or return to normal, resolving the hypertension.
When explaining cholesterol levels to a patient, the nurse understands that:
- The goal of treatment is to have high levels of very low-density lipoprotein (VLDL).
- Patients should aim to have low levels of high-density lipoprotein (HDL).
- Low-density lipoprotein (LDL) is considered to be the good cholesterol.
- High-density lipoprotein (HDL) may help protect the heart.
Explanation
High-density lipoprotein (HDL) is often referred to as "good cholesterol" because it helps remove excess cholesterol from the bloodstream and transports it to the liver for processing and excretion. High levels of HDL are associated with a lower risk of heart disease, as it aids in preventing the buildup of plaque in the arteries, which can lead to atherosclerosis and other cardiovascular conditions.
Damage or injury to the occipital lobe of the brain is likely to cause which of the following?
- Behavioral problems
- Hearing loss
- Visual loss
- Difficulty learning
Explanation
The occipital lobe is primarily responsible for processing visual information. Damage to this part of the brain can lead to various types of visual disturbances, such as partial or complete vision loss, difficulty recognizing objects, or visual field deficits (such as blindness in certain areas of the visual field). The occipital lobe contains the primary visual cortex, which is essential for interpreting the information received from the eyes.
A patient is experiencing low blood pressure (hypotension). The nurse understands that factors that may contribute to hypotension include which of the following? (Select All That Apply)
- Decreased cardiac output
- High fiber diet
- Dehydration
- High sodium intake
- Blood loss
Explanation
A. Decreased cardiac output
A decreased cardiac output means the heart is not pumping enough blood to meet the body's demands, leading to low blood pressure (hypotension). Conditions such as heart failure or severe arrhythmias can reduce cardiac output and contribute to hypotension.
C. Dehydration
Dehydration can lead to a decrease in blood volume, which lowers blood pressure. When the body loses fluids (due to vomiting, diarrhea, or insufficient fluid intake), the heart has less fluid to pump, causing hypotension.
E. Blood loss
Significant blood loss (due to trauma, surgery, or internal bleeding) reduces the total blood volume, leading to hypovolemic shock and hypotension. With less blood circulating, the heart cannot maintain adequate blood pressure.
A nursing student is reviewing the anatomy of the heart. The student knows that the tricuspid valve is located between the:
- Left ventricle and aorta
- Right atrium and right ventricle
- Right ventricle and pulmonary artery
- Left atrium and left ventricle
Explanation
The tricuspid valve is one of the four main valves in the heart. It is located between the right atrium and right ventricle. This valve regulates blood flow from the right atrium into the right ventricle and prevents backflow of blood into the atrium during ventricular contraction.
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