Clinical Case Studies: Coagulation, Edema, and Hematology

Snake Venom and Coagulation Inhibition

You are a general physiotherapist in the north of the country. A man arrives at your office after being bitten by a poisonous snake. The poison control center informs you that the animal's venom binds irreversibly to prothrombinase, inactivating it, and lowers plasma vitamin K levels. Based on this information, describe the clinical aspects expected in this patient.

Response: The venom blocks the coagulation cascade by inhibiting prothrombinase. Consequently, prothrombin is not activated into thrombin, preventing the conversion of fibrinogen into fibrin.

Starling Forces and Tissue Edema

a) Factors in Microcirculation

Mention the factors considered by Starling for fluid movement in the microcirculation.

b) Causes of Tissue Edema

Taking the above factors into consideration, determine two factors that may cause tissue edema and explain them.

c) Management of Interstitial Edema

How would you contribute to the management of interstitial edema in light of the previous knowledge?

Chemotherapy-Induced Hematological Complications

Don Juan is a patient who received 7 days of chemotherapy for colon cancer. Upon assessment, the patient is pale, tachycardic, and presents with a hematocrit of 20%, a reticulocyte count of 0.5% (normal: 2%), and a white blood cell count of 1,000 (normal: 5,000).

Why does the patient have these blood cell values?
Chemotherapy destroys rapidly dividing cells; while targeting cancer cells, it also destroys healthy red blood cells and bone marrow precursors.

What are the potential complications for this patient?
The patient is at risk of severe complications due to pancytopenia, including anemia, infection, and bleeding, similar to those described in leukemia patients.

Chronic Liver Damage and Clinical Findings

You evaluate a patient with a history of severe chronic liver damage. The patient reports feeling unwell and is concerned about frequent epistaxis. This is accompanied by generalized edema, blood pressure of 70/30, and severe dyspnea. Do these findings relate to the underlying pathology?

Response: Yes.

Supporting Evidence:

• Epistaxis: Occurs due to impaired synthesis of coagulation factors in the liver, disrupting the coagulation cascade.
• Edema: Results from decreased oncotic pressure (due to low albumin), causing fluid to remain in the extracellular space rather than returning to the vascular or lymphatic system.
• Dyspnea: Caused by anemia (reduced red blood cells and hemoglobin), which impairs oxygen transport and leads to tissue hypoxia.