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Symptomatic hypocalcemia precipitated by small-volume blood transfusion
M J Niven1, M Zohar, Z Shimoni
1Department of Internal Medicine B, Laniado Hospital, Netanya, Israel. mniven@trendline.co.il
Annals of Emergency Medicine
|October 17, 1998
Summary
Small blood transfusions can trigger symptomatic hypocalcemia in patients with underlying, undiagnosed low calcium levels. This highlights the importance of screening patients with risk factors before transfusions.
Area of Science:
- Internal Medicine
- Hematology
- Endocrinology
Background:
- Packed red blood cell (PRBC) transfusions are common medical procedures.
- Hypocalcemia, or low calcium levels, can be asymptomatic and undiagnosed.
- Certain patient populations may be at higher risk for electrolyte disturbances after transfusion.
Observation:
- Two cases are presented where minor PRBC transfusions led to symptomatic hypocalcemia.
- Both patients had pre-existing, untreated, asymptomatic hypocalcemia.
- One patient had a history of partial thyroidectomy; the other had documented hypocalcemia without a clear diagnosis.
Findings:
- Even small volumes of PRBC transfusions can precipitate symptomatic hypocalcemia.
- Pre-existing, undiagnosed hypocalcemia is a critical risk factor.
- Thyroid surgery history and prior documented hypocalcemia are indicators of increased risk.
Implications:
- Screening for hypocalcemia in at-risk patients before PRBC transfusion is crucial.
- Recognizing risk factors can prevent transfusion-related complications.
- This underscores the importance of thorough patient history and pre-transfusion assessments.