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Zorluk: KolayInterpreting Laboratory Results

Match the following cerebrospinal fluid (CSF) laboratory profiles with their most likely corresponding clinical diagnosis.

  • Acute Bacterial MeningitisNeutrophilic pleocytosis (>1000/μL>1000/\mu\text{L}), high protein, low glucose (<40 mg/dL<40 \text{ mg/dL})
  • Viral (Aseptic) MeningitisLymphocytic pleocytosis (<500/μL<500/\mu\text{L}), normal protein, normal glucose
  • Tuberculous MeningitisLymphocytic pleocytosis (100−500/μL100-500/\mu\text{L}), markedly high protein, very low glucose
  • Subarachnoid HemorrhageSignificantly elevated RBCs, xanthochromia, elevated protein, normal glucose

Cevap

Acute Bacterial Meningitis matches with neutrophilic pleocytosis and low glucose; Viral Meningitis matches with lymphocytic pleocytosis and normal glucose; Tuberculous Meningitis matches with lymphocytic pleocytosis and very low glucose; Subarachnoid Hemorrhage matches with elevated RBCs and xanthochromia.
Correct matching relies on pattern recognition of CSF components. Bacterial infections cause neutrophilic pleocytosis with low glucose. Viral infections cause lymphocytic pleocytosis with normal glucose. Tuberculous infections cause lymphocytic pleocytosis with low glucose and very high protein. Subarachnoid hemorrhage presents with RBCs and xanthochromia without affecting glucose.

Adım Adım Çözüm

1
Analyze the predominant white blood cell type in each profile.
Neutrophils indicate a bacterial infection, while lymphocytes suggest viral or tuberculous etiologies.
Different pathologic mechanisms trigger distinct immune cellular responses.
2
Evaluate the CSF glucose concentration.
Normal glucose points to viral or non-infectious causes, while low glucose points to bacterial or tuberculous infections.
Bacterial and mycobacterial organisms alter active glucose transport and consume glucose in the subarachnoid space.
3
Look for specific non-infectious markers such as red blood cells or xanthochromia.
The presence of RBCs and xanthochromia identifies a hemorrhagic process rather than a primary infection.
Xanthochromia results from hemoglobin breakdown in the CSF, which is a classic finding for subarachnoid hemorrhage.

Anahtar Kavram

Cerebrospinal Fluid (CSF) Analysis Patterns
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Konular

Interpreting Laboratory Results

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