Property:AnswerCExp
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'''Incorrect''' : Oral supplementation are only preferable for chronic asymptomatic condtions. +
'''Incorrect''' : MRI/CT is done only after biochemical confirmation is made for localizing the tumour. +
'''Correct''' : Phenoxybenzamine is the preferred drug for pheochromocytoma to control hypertension. Patients should be treated with drugs for 0-14 days prior to the surgery. +
Heparin activates antithrombin III. Heparin is indicated for thromboembolic diseases, which are less likely than Lyme disease in a young patient who has recently returned from a camping trip. +
'''Incorrect''' : No treatment is required in asymptomatic patients. However involvement of weight bearing joints mandates to start treatment to prevent future deformities. +
'''Correct''' : With the Phalen maneuver, the patient fully flexes the palms at the wrist with the elbow in full extension to provide extra pressure on the median nerve. Alternatively, the backs of the hands are placed against each other to provide hyperflexion of the wrist, and the elbows remain flexed. A positive Phalen sign is defined as pain and/or paresthesia in the median-innervated fingers with one minute of wrist flexion. Meta-analyses have shown an average sensitivity of 68 percent and specificity of 73 percent for a positive Phalen's test. Hence this the correct option. +
MERRF is not associated with respiratory acidosis. MERRF can cause lactic acidosis. However a related mitochondrial condition, MELAS, is more associated with lactic acidosis. +
Ragged red fibers on muscle biopsy are characteristic of mitochondrial diseases, including MELAS. +
Aminoglycosides inhibit the formation of the initiation complex and cause mRNA misreading. +
Idiopathic thrombocytopenic purpura (ITP) is an acquired bleeding disorder caused by decreased production and increased destruction of platelets due to formation of auto-antibodies against GpIIb/IIIa. ITP is associated with several environmental exposures, including hematological malignancies, HIV infection, HCV infection, and lupus erythematosus. The long history of bleeding and normal platelet counts make ITP a less likely diagnosis in this patient. +
'''Incorrect'''-Secondary and tertiary are central hypothyroidism. Low circulating thyroid hormone levels with low or inappropriate normal TSH levels characterize them. +
'''Incorrect'''-Determination of serum copper will only be needed when Wilson’s disease is the probable cause of hepatic abnormalities. +
'''Incorrect'''-Only in distal perforations that are close to the gastroesophageal junction, a left thoracotomy approach is recommended. +