NEET MDS Shorts
93622
Oral PathologyAplastic anemia is commonly associated with chloramphenicol.
93082
INI CET
Osseograft is a bone graft (promotes bone growth). In ankylosis surgery, we want to PREVENT bone growth between the segments, so soft tissue interposition (fat, fascia) is used.
46989
Oral SurgeryProper abscess drainage involves creating an incision to allow pus to drain completely. Probing with an artery forceps ensures complete evacuation of the cavity. Other methods, like simple aspiration or superficial incisions, may not adequately drain the abscess.
37783
EndodonticsFigure-of-eight is not a recognized standard approach for apicectomy. Standard approaches include envelope, triangular, rectangular, and semilunar incisions, each with specific indications.
27494
Oral PathologyCosmetic surgery after puberty is the treatment for a child with cherubism.
31821
EndodonticsIn primary teeth, intrusion is common because alveolar bone is pliable. Primary teeth characteristics that predispose to intrusion: 1) The alveolar bone around primary teeth is more cancellous and flexible, 2) This pliable bone allows the tooth to be pushed deeper into the socket rather than being displaced laterally or avulsed, 3) The root structure of primary teeth also contributes to this pattern. While vertical overlap and lip protection may influence injury patterns, the primary factor is the pliable nature of the developing alveolar bone in children.
74467
General Medicine
The heat-labile toxin (LT) of ETEC is similar to cholera toxin and acts by increasing intracellular cAMP levels in enterocytes, leading to excessive chloride and fluid secretion into the lumen of the gut, resulting in diarrhea.
76043
Oral SurgeryEffective cardiopulmonary resuscitation (CPR) can lead to improved cerebral perfusion and oxygenation, which may result in constriction of the pupils (miosis) as the body begins to recover from the state of shock.
59432
INI CET
In a growing child with TMJ ankylosis, chondrocostal grafting is preferred as it provides a growth center to maintain ramal height and accommodate mandibular growth.
39706
Biochemistry
Epinephrine, also known as adrenaline, is a hormone and neurotransmitter that
is synthesized in the body from the amino acid tyrosine. Tyrosine is a
non-essential amino acid, which means that it can be synthesized in the body
from phenylalanine, another essential amino acid. The synthesis of epinephrine
occurs in two main steps:
1. Hydroxylation of tyrosine: Tyrosine is converted into dihydroxyphenylalanine
(DOPA) by the enzyme tyrosine hydroxylase. This is the rate-limiting step in the
synthesis of epinephrine.
2. Decarboxylation and further hydroxylation: DOPA is then decarboxylated to
form dopamine, which is further hydroxylated to produce norepinephrine.
Norepinephrine is the immediate precursor of epinephrine.
3. Formation of epinephrine: Norepinephrine is methylated by the enzyme
phenylethanolamine N-methyltransferase (PNMT) and converted into epinephrine.
The other amino acids listed are not directly involved in the synthesis of
epinephrine:
1. Valine and Leucine are branched-chain amino acids that are primarily involved
in the metabolism of muscles and energy production.
2. Cysteine is a sulfur-containing amino acid that is important for the
synthesis of proteins with disulfide bridges and is a precursor for other
molecules like glutathione and taurine, but not directly involved in the
synthesis of epinephrine.