MDS PREP
What is the most common cause of chronic bronchitis?
(1) Smoking
(2) Viral infections
(3) Bacterial infections
(4) Air pollution
Chronic bronchitis is most commonly caused by smoking. It is characterized by chronic inflammation of the bronchial tubes, leading to excess mucus production and coughing. Other causes include long-term exposure to irritants like air pollution and repeated respiratory infections.
A patient presents with oral lesions and is diagnosed with secondary syphilis. Which of the following is a characteristic feature of this stage?
(1) Condylomata lata
(2) Lues maligna
(3) Mucous patches
(4) Necrotizing ulcerative periodontitis
Secondary syphilis is characterized by the development of mucocutaneous lesions, including mucous patches, which are painless, erythematous ulcers with a smooth, moist, and glistening appearance, often found on the oral mucosa. These lesions can occur anywhere in the oral cavity but are particularly common on the tongue, palate, and buccal mucosa.
What is the primary function of the mitral valve in the heart?
1) To prevent backflow of blood from the aorta into the left ventricle during diastole
2) To prevent backflow of blood from the pulmonary artery into the right ventricle during systole
3) To prevent backflow of blood from the left atrium into the left ventricle during systole
4) To prevent backflow of blood from the vena cava into the right atrium during systole
The mitral valve is crucial in preventing the backflow of blood from the left atrium to the left ventricle during systole, ensuring that blood flows in the correct direction through the heart during the cardiac cycle.
What is the normal respiratory rate for an adult?
1) 12-16 breaths/min
2) 16-20 breaths/min
3) 20-24 breaths/min
4) 24-30 breaths/min
The normal adult respiratory rate is typically between 12 and 16 breaths per minute.
In the treatment of herpes labialis (cold sores), which medication is not available in a cream formulation?
(1) Acyclovir
(2) Penciclovir
(3) Docosanol
(4) Lysine
Penciclovir is the correct answer as it is not available in a cream formulation. Acyclovir and docosanol are available in cream formulations for the treatment of cold sores. Lysine is an amino acid supplement that may help reduce the frequency of herpes outbreaks but is not a medication specifically designed to treat herpes labialis.
In a patient with nephrotic syndrome, which of the following is true regarding plasma cholesterol levels?
(1) Plasma cholesterol levels are decreased due to increased LDL receptors in the liver.
(2) Plasma cholesterol levels are increased due to the loss of cholesterol in urine.
(3) Plasma cholesterol levels are normal as the condition is unrelated to lipid metabolism.
(4) Plasma cholesterol levels are decreased due to increased hepatic synthesis of bile salts.
Nephrotic syndrome is associated with hyperlipidemia, particularly increased levels of LDL and cholesterol. The underlying mechanism involves the loss of albumin in the urine, which leads to hypoalbuminemia. This causes an increased synthesis of very low-density lipoproteins (VLDL) by the liver to compensate for the loss of oncotic pressure. Additionally, the loss of proteins that normally bind to cholesterol in the blood, such as lipoproteins, results in decreased clearance of LDL.
In the context of antitubercular therapy, which of the following is true about the metabolism of isoniazid and streptomycin?
(1) Both are metabolized in the liver
(2) Both are metabolized in the kidneys
(3) Isoniazid is metabolized in the liver, while streptomycin is metabolized in the kidneys
(4) Isoniazid is metabolized in the kidneys, while streptomycin is metabolized in the liver
Isoniazid is metabolized by the liver, while streptomycin is metabolized by the kidneys. This is important to consider when administering these drugs, especially in patients with hepatic or renal impairment.
A 25-year-old pregnant woman presents with complaints of mild abdominal pain and diarrhea. Her blood pressure is 90/60 mmHg and her urine output is decreased. What is the most likely cause of her symptoms?
(1) Gestational diabetes
(2) Urinary tract infection
(3) Hyperemesis gravidarum
(4) Intestinal obstruction
Hyperemesis gravidarum is severe nausea and vomiting during pregnancy that can lead to dehydration and electrolyte imbalances. The patient's symptoms and signs of dehydration (low blood pressure and decreased urine output) support this diagnosis.