A Devastating HIT: When a Delayed Diagnosis Costs Limbs

Description

After cardiac catheterization and heparin therapy, an undiagnosed immune reaction caused widespread blood clots. Delayed diagnosis and contraindicated treatment led to multiple limb amputations.

Key Lessons

• Consulting specialists early in complex or rapidly evolving cases is essential when diagnoses are uncertain or when decisions carry high risk.
• Reassess and broaden the differential diagnosis when laboratory findings or changes in the patient’s condition suggest alternative explanations.

Clinical Sequence

A middle‑aged patient with hypertension, diabetes, high cholesterol, coronary artery disease, and a prior stent presented to the cardiologist with worsening chest pain and shortness of breath. Three weeks later, she underwent a cardiac catheterization to investigate an abnormal myocardial perfusion study; her platelet levels were normal prior to the procedure. During the catheterization, she experienced repeated clotting in a major coronary artery and experienced cardiac arrest. Following prolonged resuscitation and advanced life support procedures (ECMO), additional stents were placed, and heparin was administered.

Over the next several days, the patient’s platelet count continued to fall, however, recovered with transfusions. Approximately one week later, she developed swelling in her left upper arm, and an ultrasound revealed a blood clot. A continuous infusion of heparin was initiated. Soon after, she developed a fever and further platelet decline. A chest CT showed a saddle pulmonary embolus & widespread thrombus; Heparin-Induced Thrombocytopenia (HIT—a dangerous immune system response to Heparin) was suspected, but a Hematology consult was not requested until a few days later.

During this time, the patient continued to receive platelet transfusions—despite this treatment being contraindicated for HIT. The delay in diagnosis and treatment led to loss of circulation in multiple limbs, ultimately resulting in bilateral above-knee amputations and amputation of the left hand.

Allegation

The plaintiff alleged that the medical team failed to recognize and treat an immune‑mediated reaction to heparin in a timely manner. The claim asserted that the delay in consulting appropriate specialists and the continued administration of contraindicated treatments resulted in extensive, avoidable harm.

Disposition

The case was settled in the high range (>$1M).

Clinical Analysis

• Classic signs of an immune reaction to heparin were present but not recognized in a timely manner.
• Platelet transfusions were administered despite being contraindicated, contributing to clot progression.
• A hematology consult was delayed even after new clot formation and falling platelet levels.
• Providers attributed concerning symptoms, such as falling platelets and limb discoloration, to other common conditions rather than ruling out more serious causes.
• Documentation did not reflect active consideration of the correct diagnosis as platelet abnormalities emerged.
• Earlier recognition and intervention could have prevented the catastrophic progression to limb loss.

Discussion Questions

1. What early clinical indicators in this case should have prompted consideration of an immune‑mediated reaction to heparin?
2. How might earlier consultation with a hematologist have changed the patient’s clinical course?
3. What systems‑level practices could help ensure that unexpected laboratory trends or complications trigger timely specialist involvement?

Other Resources

Heparin-induced thrombocytopenia (HIT): Review of incidence, diagnosis, and management - Marie Hogan, Jeffrey S Berger, 2020

This is a fictitious case that illustrates commonly encountered issues and is for educational purposes only. Any resemblance to real persons, living or dead, is purely coincidental.