fbpx

Repeated USMLE Questions Step 1- 346



Q- Which one of the following medications stimulates muscarinic receptors in airways when inhaled?

A- Bethanechol

B- Carbachol

C- Methacholine

D- Pilocarpine

C- Methacholine



Q- Which of the following characterizes syndrome of inappropriate antidiuretic hormone secretion?

A- Euvolemic hyponatremia with continued Na excretion

B- Hyperosmotic volume contraction

C- Recommended treatment is desmopressin acetate and hydration

D- Serum osmolality is greater than urine osmolality

A- Euvolemic hyponatremia with continued Na excretion



Q- Which of the following organisms is responsible for antibiotic-associated colitis?

A- Clostridium difficile

B- Clostridium botulinum

C- Clostridium perfringens

D- Clostridium tetani

A- Clostridium difficile



2 thoughts on “Repeated USMLE Questions Step 1- 346”

  1. Dear Dr. Nancy

    This is a great question.

    The syndrome of inappropriate antidiuretic hormone secretion (SIADH) is best defined by:

    -Hyponatremia with corresponding hypoosmolality

    -Continued renal excretion of Na+

    -Urine less than maximally dilute

    -Absence of clinical evidence of volume depletion – Normal skin turgor, blood pressure within the reference range

    -Absence of other causes of hyponatremia – Adrenal insufficiency (mineralocorticoid deficiency, glucocorticoid deficiency), hypothyroidism, cardiac failure, pituitary insufficiency, renal disease with salt wastage, hepatic disease, drugs that impair renal water excretion

    Correction of hyponatremia is accomplished by fluid restriction

    Thank you so much

  2. Dear Dr Ray,
    Can you please explain the SIADH question and why you choose euvolemic hyponatremia
    Thanks

Leave a Comment