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NBME F1B1Q37 - 62yo woman with LOC - maritzasf
#1
NBME F1B1

Q-37

For each patient with loss of consciousness, select the most likely diagnosis.
A) Aortic stenosis
B) Carotid sinus hypersensitivity
C) Conversion reaction
D) Hypertrophic obstructive cardiomyopathy
E) Hypoglycemia
F) Mitral valve prolapse
G) Orthostatic hypotension
H) Pulmonary embolus
I) Seizure
J) Vasovagal syncope
K) Vertebrobasilar insufficiency

37. A 62-year-old woman is brought to the emergency department 1 hour after a 1-minute episode of loss of consciousness; her symptoms began when she stood up after she passed a dark, watery stool. She has had diarrhea and dark stools for 2 days. She has been receiving warfarin therapy for deep venous thrombosis for 2 weeks. On arrival, her blood pressure is 82/60 mm Hg, and pulse is 150/min and regular. She is unable to stand. The lungs are clear to auscultation. A grade 2/6 systolic murmur is heard at the second right intercostal space with no radiation. Examination shows a soft, nontender abdomen. There is 1+ edema of the right lower extremity with no tenderness. Test of the stool for occult blood is positive.
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#2
g.orthostatic hypotension
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#3
G) Orthostatic hypotension

The most important thing to do in acute GI bleeding is to determine if there is hemodynamic instability.
Orthostatic hypotension means a drop in BP or rise in Pulse when going from a lying to a standing or seated position.

Orthostasis is defined as a drop in SP > 20 mm hg or a rise in Pulse > 10 beats per minute.
Orthostasis presents with one of the following:
SP < 100
Heart rate > 100

Either of these implies more than 30 percent volume loss.

[Fischer, Conrad; Kaplan Medical USMLE Master the Boards Step 3]
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