MSN 611 : Clinical Pharm & Intervention for APRNs - NKU

Correct Answer:

B - gastroesophageal reflux

Explanation of the Correct Answer:

Gastroesophageal reflux disease (GERD) is characterized by postprandial burning in the retrosternal area (heartburn), dysphagia (difficulty swallowing), and globus sensation (feeling of a lump in the throat). These symptoms occur due to the backflow of acidic gastric contents into the esophagus, irritating the esophageal lining. GERD is commonly exacerbated by meals, especially large or fatty meals, and when lying down after eating. The globus sensation is due to irritation or spasm of the muscles around the throat caused by acid reflux.

Why the Other Options Are Incorrect:

A - Hiatal hernia:

A hiatal hernia can predispose someone to GERD by allowing part of the stomach to herniate through the diaphragm into the chest cavity, but by itself, a hiatal hernia may be asymptomatic or cause mild reflux symptoms. It is not the direct cause of the classic burning sensation unless GERD is present.

C - Peptic ulcer disease:

Peptic ulcer disease (PUD) presents with epigastric pain that is often described as gnawing or burning but located more in the upper abdomen, not retrosternal. Pain is also more commonly related to fasting or relieved by eating in duodenal ulcers, rather than directly associated with dysphagia or globus sensation.

D - Esophageal cancer:

Esophageal cancer can cause progressive dysphagia (initially to solids, then to liquids) and weight loss, but it usually presents insidiously over time rather than being primarily related to meals or causing typical postprandial burning. Globus sensation is not a hallmark of esophageal cancer.

Correct Answer: 

A. 32cm

Explanation of the Correct Answer:

Intrauterine growth restriction (IUGR) is suspected when the fetus is not growing as expected for its gestational age. Normally, at 35 weeks of gestation, the fundal height should approximate the number of weeks of pregnancy, plus or minus 2 cm. For example, at 35 weeks, the fundal height should be about 35 cm. A 32 cm measurement suggests that the fetus may be smaller than expected for the gestational age, which could indicate IUGR. In cases of IUGR, the fetus may not be growing appropriately due to a variety of factors such as placental insufficiency, maternal health issues (e.g., hypertension, diabetes), or genetic factors.

Why the Other Options Are Incorrect:

B - 34 cm:

A fundal height of 34 cm is within the expected range for 35 weeks of gestation (which should be around 35 cm ± 2 cm). This is not typically a sign of IUGR.

C - 35 cm:

A 35 cm measurement at 35 weeks is considered normal. This is within the expected range for fetal growth, and no signs of IUGR would be suspected based on fundal height alone.

D - 38 cm:

A 38 cm measurement at 35 weeks is slightly larger than expected, but it could indicate a larger-than-expected fetus rather than IUGR. This is not a typical sign of IUGR, which is characterized by smaller-than-expected growth.

Correct Answer:

A - syphilis during pregnancy may result in increased fetal mortality.

Explanation of the Correct Answer:

Syphilis is a sexually transmitted infection caused by Treponema pallidum and is particularly concerning during pregnancy because it can be transmitted to the fetus, leading to congenital syphilis. If left untreated, syphilis during pregnancy can lead to miscarriage, stillbirth, or preterm birth, and can also result in severe birth defects or neonatal death. Therefore, screening for syphilis in pregnant patients is essential to reduce the risk of fetal mortality and morbidity associated with congenital syphilis.

Why the Other Options Are Incorrect:

B - Hormonal changes associated with pregnancy may trigger activation of latent syphilis:

This is not accurate. While syphilis can exist in a latent form, hormonal changes during pregnancy do not trigger the activation of latent syphilis. The infection is typically transmitted to the fetus during pregnancy if the mother has an active syphilis infection. Screening is done to identify active syphilis before it can be passed to the fetus.

C - A positive result will preclude the need for a cesarean section at delivery:

This is not correct. While syphilis is a serious infection, it does not automatically determine the need for a cesarean section. A caesarean section might be recommended if the mother has active herpes simplex virus infection, which can be transmitted during vaginal delivery. However, syphilis is usually treated with antibiotics (penicillin) during pregnancy, and treatment reduces the risk of vertical transmission of the infection to the infant, making a cesarean section unnecessary in most cases.

D - Untreated syphilis can cause neonatal respiratory distress:

While syphilis can cause serious complications for the newborn, including congenital syphilis, it does not typically cause neonatal respiratory distress. Respiratory distress is more commonly seen in conditions like respiratory infections or prematurity. The primary concern with syphilis is its potential to cause birth defects, neurological issues, or even fetal death if left untreated, not respiratory distress.

Correct Answer:

D - fever

Explanation of the Correct Answer:

Fever is a key distinguishing symptom between acute pyelonephritis and acute nephrolithiasis. Acute pyelonephritis is an infection of the kidney that typically causes systemic symptoms such as fever, chills, and malaise. In contrast, acute nephrolithiasis (kidney stones) usually causes severe flank pain, but it does not commonly cause fever unless there is a complication like infection.

Acute pyelonephritis is characterized by fever, along with costovertebral angle tenderness, dysuria, and flank pain. The fever indicates that the infection has reached the kidneys and is causing systemic inflammation.

Acute nephrolithiasis primarily causes severe, sharp, colicky pain that may radiate to the groin, but fever is not typically present unless there is an associated urinary tract infection (UTI) or another complication.

Why the Other Options Are Incorrect:

A - Costovertebral pain:

Costovertebral angle tenderness is a common finding in both acute pyelonephritis and acute nephrolithiasis. In both conditions, pain can be elicited by tapping the costovertebral angle, which is located on the back just below the ribs. This symptom alone does not help differentiate between the two conditions, as both can present with similar pain.

B - Dysuria:

Dysuria (painful urination) is a symptom that can occur in both acute pyelonephritis and acute nephrolithiasis. It may be present in pyelonephritis due to the urinary tract infection, or in nephrolithiasis due to the irritation of the urinary tract as the stone passes through. Therefore, dysuria does not clearly differentiate the two.

C - Hematuria:

Hematuria (blood in the urine) can occur in both acute pyelonephritis and acute nephrolithiasis, but it is more commonly associated with nephrolithiasis. While hematuria can be seen in both conditions, it does not distinguish them definitively, as it can occur in both kidney infections and kidney stones.

Correct Answer:

B. It would not be ideal since she is older and pantoprazole can lead to an increased risk of adverse effects.

Explanation of the Correct Answer:

Pantoprazole is a proton pump inhibitor (PPI) used to treat acid reflux and gastroesophageal reflux disease (GERD). However, in elderly patients, the use of PPIs should be carefully considered due to the increased risk of adverse effects. In elderly individuals, PPIs can be associated with several potential risks, including:

Increased risk of fractures: Long-term PPI use is linked to osteoporosis and a higher risk of bone fractures, especially in older adults.

Nutrient deficiencies: PPIs reduce stomach acid, which can lead to deficiencies in essential nutrients such as vitamin B12, magnesium, and calcium.

Kidney disease: Chronic use of PPIs has been associated with an increased risk of chronic kidney disease.

Clostridium difficile infection: There is an increased risk of C. difficile infections in the colon with prolonged PPI use.

Given these risks, non-pharmacologic treatments (e.g., lifestyle changes) and less potent medications (such as H2 receptor antagonists) are often preferred for elderly patients, unless the condition is severe enough to warrant stronger medications like PPIs.

Why the Other Options Are Incorrect:

A. Yes, it is an appropriate treatment for her symptoms.

While pantoprazole can be an effective treatment for acid reflux, the risks associated with its use in elderly patients, as discussed above, make it less ideal for this patient. Therefore, prescribing it without considering alternatives is not appropriate.

C. Pantoprazole should only be prescribed if the patient’s acid reflux is diagnosed as gastroesophageal reflux disease (GERD).

While GERD is a common cause of acid reflux, the patient is experiencing symptoms that suggest reflux but has not been formally diagnosed with GERD. Even if GERD is suspected, PPIs should still be prescribed cautiously in the elderly.

D. Pantoprazole is not recommended for patients over 65 due to potential for liver toxicity.

While liver toxicity can be a concern with some medications, pantoprazole does not have a specific contraindication for elderly patients based solely on liver toxicity. The main concerns for elderly patients are the other risks discussed above, such as fractures and nutrient deficiencies.

Correct Answer:

C - diminished renal function.

Explanation of the Correct Answer:

Diminished renal function is a major cause of hyperkalemia. The kidneys are primarily responsible for excreting potassium. When renal function declines, potassium clearance is impaired, leading to an accumulation of potassium in the blood. Chronic kidney disease (CKD) and acute kidney injury (AKI) are common clinical settings where hyperkalemia is observed.

Why the Other Options Are Incorrect:

A - A decrease in aldosterone secretion:

While a decrease in aldosterone (such as in Addison’s disease or adrenal insufficiency) can indeed cause hyperkalemia by reducing potassium excretion, this is not the most direct or common association compared to diminished renal function. The question asks for the main association, and impaired renal function is a broader and more frequent cause.

B - A decrease in sodium reabsorption:

Decreased sodium reabsorption alone does not directly lead to hyperkalemia. Although sodium and potassium transport are linked in the nephron, the relationship is complex. Primary sodium loss could actually cause secondary increases in aldosterone (which would attempt to correct both sodium and potassium balance). It is not the primary mechanism behind hyperkalemia.

D - Loop diuretics:

Loop diuretics, such as furosemide, typically cause hypokalemia, not hyperkalemia. They promote the loss of potassium through the urine by inhibiting sodium, potassium, and chloride reabsorption in the loop of Henle, leading to potassium wasting.

Correct Answer:

A - amoxicillin-clavulanate (Augmentin) or cephalexin (Keflex).

Explanation of the Correct Answer:

In pregnant women, particularly at 30 weeks gestation, it is essential to choose antibiotics that are both effective and safe for fetal development. Amoxicillin-clavulanate (Augmentin) and cephalexin (Keflex) are beta-lactam antibiotics that are considered safe during pregnancy (Category B) and are commonly used for empiric treatment of urinary tract infections (UTIs) in pregnant patients. They effectively target the common organisms responsible for UTIs, such as Escherichia coli, while minimizing fetal risk.

Why the Other Options Are Incorrect:

B - Nitrofurantoin (Macrobid) or ciprofloxacin (Cipro):

While nitrofurantoin is sometimes used in pregnancy, it is typically avoided during the third trimester (after 37 weeks) because of the risk of hemolytic anemia in the newborn, especially if there is a deficiency of G6PD. Ciprofloxacin is a fluoroquinolone and is generally avoided throughout pregnancy because of potential adverse effects on fetal cartilage development.

C - Ciprofloxacin (Cipro) or tetracycline (Sumycin):

Both medications are contraindicated in pregnancy. Ciprofloxacin poses risks to developing cartilage and bones, while tetracyclines (like Sumycin) can cause permanent tooth discoloration and inhibit bone growth in the fetus.

D - Azithromycin (Zithromax) or doxycycline (Doryx):

While azithromycin is relatively safe during pregnancy, it is not the drug of choice for treating UTIs. Doxycycline, like other tetracyclines, is contraindicated due to risks of fetal dental and skeletal abnormalities.

Correct Answer:

C - Phase 3

Explanation of the Correct Answer:

Ibutilide is a Class III antiarrhythmic drug that primarily prolongs the action potential duration by blocking potassium channels, specifically delayed rectifier potassium channels (I_Kr). This blockage prolongs the repolarization phase of the myocyte action potential.

Phase 3 of the myocyte action potential is known as the repolarization phase, where the cell returns to its resting membrane potential after depolarization. During this phase, potassium ions exit the cell, and the repolarization process occurs. By blocking potassium channels, ibutilide prolongs Phase 3, effectively lengthening the action potential duration and refractory period, which helps to prevent arrhythmias such as atrial fibrillation and atrial flutter by making the heart less excitable during this period.

Why the Other Options Are Incorrect:

A - Phase 1:

Phase 1 is the initial repolarization phase, which involves the transient outward potassium current (I_to) and partial closure of sodium channels. Ibutilide does not significantly affect Phase 1; its primary action is on Phase 3.

B - Phase 2:

Phase 2 is the plateau phase of the action potential, where calcium ions enter the cell and balance the potassium ion efflux, maintaining a plateau in the action potential. Ibutilide does not have a major effect on this phase, as it primarily acts on the potassium channels that are involved in Phase 3 repolarization.

D - Phase 4:

Phase 4 is the resting membrane potential phase, where the cell is not actively undergoing depolarization or repolarization. Ibutilide’s action is not primarily at this phase, as it mainly affects the action potential duration and repolarization during Phase 3.

Correct Answer:

D - continue the current therapy for an additional 3-5 weeks.

Explanation of the Correct Answer:

Tinea capitis, a fungal infection of the scalp, is typically treated with oral antifungal agents such as griseofulvin. This condition often requires several weeks of treatment because the infection is located in the hair follicles, which are more difficult to penetrate. It is not uncommon for a marginal improvement to be seen after 3 weeks of treatment, and the treatment course should generally be extended. The standard duration for griseofulvin therapy is usually 6-8 weeks, and in some cases, it may take even longer for the infection to fully resolve. Therefore, the correct approach would be to continue the current therapy for an additional 3-5 weeks to ensure sufficient time for the antifungal to fully clear the infection.

Why the Other Options Are Incorrect:

A - add 2.5% selenium sulfide shampoo weekly to the treatment regimen:

While selenium sulfide can help reduce scalp fungal burden and control scalp flaking, it is not typically the next step in treating tinea capitis after griseofulvin has been started. The use of selenium sulfide shampoo may be considered as an adjunct but would not replace or alter the primary treatment with oral griseofulvin. Adding it prematurely may not improve the condition if the oral therapy needs more time.

B - add a topical antifungal cream to the regimen:

Topical antifungal creams, such as clotrimazole or miconazole, are generally not effective for treating tinea capitis because the infection involves the hair follicles, which are not adequately treated by topical medications. Oral therapy is the standard of care, and using a topical antifungal would not be an appropriate next step in management.

C - initiate a short course of oral steroids to reduce inflammation and prevent scarring:

Oral steroids are not typically recommended in the treatment of tinea capitis. While inflammation may occur as part of the infection, steroids are contraindicated in fungal infections because they can suppress the immune response, potentially worsening the infection. The focus should remain on continuing antifungal therapy rather than adding steroids.