Hematologic

Every anemia is the same problem — too little oxygen-carrying capacity — with a different cause, and MCV, ferritin, and reticulocytes tell you which one.

One swapped amino acid makes hemoglobin polymerize when it loses oxygen — deforming red cells into rigid sickles that clog vessels, break down early, and set up the classic crises.

Clotting is switched on everywhere at once — and by consuming the platelets and factors in the microvasculature, it leaves the patient unable to clot where it actually matters.

A low platelet count is a finding, not a diagnosis — and the two named syndromes behind it pull in opposite directions, because one bleeds and the other clots.

Malignant blood cells crowd the marrow out of its job — and the anemia, infection risk, and bleeding that follow are one mechanism seen three ways.

Cancers of lymphocytes that usually announce themselves as painless swollen lymph nodes — Hodgkin spreading node to node in young adults, non-Hodgkin less predictable and older — and that range from curable in weeks of chemotherapy to indolent disease watched for years.

A cancer of plasma cells that fills the bone marrow, dissolves bone and floods the blood with one abnormal antibody — producing the CRAB picture of high calcium, failing kidneys, anemia and bone lesions in an older adult with back or rib pain.

Inherited bleeding disorders from a missing or faulty clotting protein: in hemophilia the weak fibrin clot lets joints and muscles bleed deep and repeatedly; in von Willebrand disease platelets cannot stick, so bleeding is mucosal — noses, gums and heavy periods.

A slow-growing blood cancer in which a JAK2-mutated marrow overproduces red cells (and often white cells and platelets): the blood thickens, flow slows, and clots — stroke, heart attack, DVT — are the main danger. Phlebotomy keeps the hematocrit below 45%.

Adverse reactions to whole blood or blood components, from common febrile and mild allergic reactions to life-threatening acute hemolysis, anaphylaxis, sepsis, TACO and TRALI. The nursing response is the same first move every time: stop the transfusion, disconnect the blood tubing, keep the IV open with 0.9% saline, stay with the patient, and notify the clinician and blood bank.