NEET MDS Shorts
55278
Oral SurgeryDibucaine (cinchocaine) is a highly potent and long-acting local anesthetic with high toxicity. It is often used in topical applications but is avoided for systemic use due to its high risk of adverse effects compared to alternatives like bupivacaine.
86550
Oral PathologyWhite sponge nevus is inherited as an autosomal dominant trait.
59108
Physiology
Answer: 1) Acetylcholine
Explanation: The pupillary sphincter muscle is innervated by the parasympathetic nervous system, which uses acetylcholine as its primary neurotransmitter. Contraction of this muscle leads to pupil constriction, or miosis, which occurs in low-light conditions or when focusing on near objects.
81558
INI CET
Prescriptive analysis is the most advanced form, using optimization and simulation algorithms to advise on the best course of action to achieve goals.
36955
PhysiologyFluorescent lighting enhances the visibility of scleral icterus, making it easier to detect jaundice.
83305
Pathology
Gas Gangrene, also known as clostridial myonecrosis or anaerobic cellulitis,
is a severe and rapidly progressing form of necrotizing soft tissue infection
caused by the bacterial genus Clostridium. The condition is characterized by the
production of gas within the tissues due to the fermentation of carbohydrates by
the bacteria. The most common species implicated in gas gangrene is Clostridium
perfringens.
1. Clostridium tetani: This bacterium is the causative agent of tetanus, which
is a neurotoxic disease that leads to muscle spasms and rigidity. It is not
directly associated with gas gangrene, although both are anaerobic infections
that can occur in deep puncture wounds and both produce exotoxins. However, the
primary symptom of tetanus is muscular rigidity and spasms due to the production
of tetanospasmin, not the tissue destruction and gas production seen in gas
gangrene.
2. Clostridium perfringens: This is the most common cause of gas gangrene. C.
perfringens produces alpha toxin, which is a powerful enzyme that can break down
tissue and release gas as a byproduct. The infection typically occurs in the
deep layers of the skin and muscles following a severe trauma, surgery, or
burns, where there is a lack of oxygen, allowing the anaerobic bacteria to
thrive. The rapid spread of infection is due to the bacteria's ability to
produce multiple exotoxins that cause tissue necrosis and vasoconstriction,
leading to ischemia and further tissue damage.
3. Clostridium difficile: Although a member of the Clostridium genus, C.
difficile is mainly associated with antibiotic-associated diarrhea and
pseudomembranous colitis. It is a hospital-acquired infection that affects the
intestinal tract and is not typically involved in causing gas gangrene. While it
is an anaerobic bacterium, its pathogenicity is primarily due to the production
of toxins that damage the colon's mucosal lining rather than invading tissues
outside the gut.
4. Peptostreptococci: These are anaerobic bacteria that can be part of the
normal skin and mucosal flora. They are involved in various infections,
particularly in immunocompromised individuals or those with underlying medical
conditions. Peptostreptococci are more commonly associated with mixed anaerobic
infections such as abscesses, osteomyelitis, and other soft tissue infections,
but they are not typically the sole cause of gas gangrene.
91123
Oral PathologyScleroderma (systemic sclerosis) does NOT cause widening of the oral aperture. Instead, it causes NARROWING (microstomia) of the oral aperture due to perioral fibrosis and skin tightening. Scleroderma does cause a hard, rigid tongue due to collagen deposition, pseudoankylosis of TMJ due to fibrosis, and difficulty swallowing (dysphagia) due to esophageal involvement.
97481
RadiologyHigher kVp is disadvantageous to film.
66363
INI CET
Break point chlorination is the point where added chlorine satisfies the chlorine demand, after which free residual chlorine appears.
87753
NEETMDS
According to the NORMS of orthodontic records, the vertical height of study models should be 70 mm.