51678

A pathological fracture occurs when a bone breaks in an area weakened by disease, such as cancer, osteoporosis, or infection. Unlike traumatic fractures, which result from an external force, pathological fractures occur due to underlying conditions that compromise the structural integrity of the bone.

52443

The primary mechanism of action of H. pylori in chronic antral gastritis is the induction of chronic inflammation and gland atrophy.

81262

The description of a systolic murmur that increases with standing and decreases with squatting suggests a condition where the murmur is affected by changes in the flow across the mitral valve. This is characteristic of mitral regurgitation.

93900

Acetylcholinesterase receptor opens an ion channel, undergoes irreversible conformational changes when exposed to carbamates , it is inactivated in myasthenia gravis

60156

Emergency management of COPD exacerbationIn an emergency situation with a patient experiencing severe respiratory distress (indicated by working hard to breathe, high respiratory rate, and blue lips) due to a COPD exacerbation, immediate action is crucial.

The patient is likely hypoxic, and the priority is to address this life-threatening condition.

High-flow oxygen at 10-15 L/minute (through a non-rebreather mask) is the initial most appropriate management in this acute situation to rapidly increase oxygen saturation.

The concern about hypercapnic respiratory failure (CO2 retention) is secondary to the immediate need for oxygenation to prevent death.

Once the patient is stabilized and a pulse oximeter reading is available, the oxygen can be titrated to achieve the target saturation range of 88% to 92% for most COPD patients.

25004

Serum glutamic oxaloacetic transaminase (SGOT/AST) is increased in myocardial infarction. AST is released from damaged myocardial cells and peaks 24-48 hours after MI. While not specific to heart, it was historically used for MI diagnosis before troponins became available.

84888

Anthracoid bacilli ferment glucose, maltose, lactose, and sucrose, producing acid and gas.

52600

The superior thyroid vein is a direct tributary of the internal jugular vein (IJV).

87845

Orthopantamograph is not indicated in viewing all of the above: anterior body of mandible, coronoid process, lower anterior region of mandible.

81264

After periodontal surgery, root sensitivity is primarily due to the exposure of dentin tubules (option 1). When the root surface is exposed, the dentin becomes sensitive to stimuli because the tubules can transmit sensations to the pulp.
Exposed cementum (option 2) is less likely to cause sensitivity because cementum is not as innervated as dentin. Formation of plaque (option 3) can lead to sensitivity as it may irritate the surrounding tissues and contribute to inflammation.