CompTIA
Checkpoint
ISC
HP
Dell
EC-Council
EXIN
Fortinet
ITIL®
Juniper
PMI
Microsoft
VMware
Avaya
Google
Salesforce
Amazon
Palo Alto Networks
Certiport
ISC2
All Vendors
  2. Home
  3. Exams
  4. USMLE
  5. STEP3

Free STEP3 Exam Braindumps (page: 62)

Page 61 of 202
PDF with 804 Questions

A severely traumatized patient who has been receiving prolonged parenteral alimentation develops diarrhea, mental status changes, alopecia, and perioral and periorbital dermatitis. Administration of which of the following trace element is most likely to reverse these complications?

  1. iodine
  2. zinc
  3. selenium
  4. silicon
  5. tin

Answer(s): B

Explanation:

Symptoms of zinc deficiency include diarrhea, mental status changes, alopecia, and periorbital, perinasal, and perioral dermatitis. Persons who have cirrhosis, who are receiving steroids, who have excessive loss of GI secretions, or who are severely traumatized are at risk for zinc deficiency. Deficiency states resulting from inadequate ingestion of selenium, silicon, and tin have not been described. Deficiency of iodine produces hypothyroidism.



A man who underwent total thyroidectomy 24 hours ago now complains of a generalized "tingling" sensation and muscle cramps. Appropriate treatment would include which of the following?

  1. intravenous infusion of calcium gluconate
  2. administration of oxygen by mask
  3. administration of an anticonvulsant
  4. administration of a tranquilizer
  5. neurologic consultation

Answer(s): A

Explanation:

During total thyroidectomy, parathyroid glands may inadvertently be removed or their vascular supply interrupted. Hypoparathyroidism may then develop, the manifestations of which include tingling, muscle cramps, convulsions, and a positive Chvostek's sign (contraction of facial muscles after tapping the facial nerve). These symptoms are dramatically relieved by intravenous administration of calcium. Oral calcium and vitamin D are administered for long-term correction of hypocalcemia.



Vital capacity is best described as the volume of air which is:

  1. inhaled during normal respiration
  2. expelled during passive expiration
  3. remaining in the lungs after passive expiration
  4. actively exchanging with pulmonary venous blood
  5. able to be expelled following maximal inspiration

Answer(s): E

Explanation:

Vital capacity is an important measure of respiratory function. It is defined as the maximum volume of air a person can expel following a maximum inspiratory effort. When vital capacity is normal, significant restrictive pulmonary disease is not present. Acutely decreased vital capacity indicates decreased ventilatory reserve.



The most common site of aortic transection in deceleration injuries is which of the following?

  1. the root of the aorta
  2. at the level of the right innominate artery
  3. at the level of the left innominate artery
  4. near the origin of the left subclavian artery
  5. in the middle portion of the descending thoracic aorta

Answer(s): D

Explanation:

In deceleration injuries, laceration involving the aorta most frequently occurs just distal to the left subclavian artery at the level of the ligamentum arteriosum. This is where the aorta is fixed and thus more susceptible to shear forces. The tear may be complete or partial. Diagnosis is difficult, but is suggested by a widened mediastinum on chest x-ray and confirmed with a CT scan of the chest or an aortogram.






Post your Comments and Discuss USMLE STEP3 exam with other Community members:

STEP3 Discussions & Posts