After bypass 3 to 4 month post surgery py have fever but wbc normal weekly fever come and go
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The clinical picture here fits well with Postpericardiotomy Syndrome (PPS) — a well-recognized complication after bypass/cardiac surgery. Here is a comprehensive breakdown:
Post-Bypass Fever with Normal WBC — What's Happening?
Most Likely Diagnosis: Postpericardiotomy Syndrome (PPS)
This is an autoimmune/inflammatory reaction triggered by injury to the pericardial mesothelium during cardiac surgery (including CABG/bypass). It is one of the "postcardiac injury syndromes."
Why Fever with Normal WBC?
This is the key point. PPS causes fever not from infection, but from an immune complex-mediated inflammatory response. The mechanism:
- Cardiac surgery damages pericardial cells → releases cardiac antigens into the bloodstream
- The immune system mounts an antibody response (antimyocardial antibodies)
- Immune complexes deposit in the pericardium, pleura, and lungs → ongoing inflammation
- The result is recurrent, episodic fever without a bacterial source → WBC can be normal or only mildly elevated
Typical Features of PPS
| Feature | Details |
|---|---|
| Timing | Most often within the first month after surgery; almost always within 3 months; can recur |
| Fever | Recurrent, comes and goes (episodic/relapsing) |
| Chest pain | Pleuritic chest pain (56% of cases) |
| Fever alone | Present in ~54% of cases |
| Pericardial effusion | Over 80% of patients; rarely causes tamponade |
| Inflammatory markers | ESR, CRP elevated in ~74%; WBC may be normal |
| Pleural effusion | Possible — pleural fluid or pulmonary infiltrates |
The recurrent, episodic "weekly" fever pattern you describe — coming and going — is characteristic of PPS.
Other Causes to Consider (with normal WBC)
| Cause | Clue |
|---|---|
| Dressler's syndrome | Post-MI variant of same syndrome; similar presentation |
| Viral/post-viral fever | Often self-limiting |
| Drug fever | Review all post-op medications |
| Deep sternal wound infection | WBC may not always be elevated early; needs wound exam |
| Endocarditis | Usually WBC elevated; requires blood cultures + echo |
| CMV/other viral infection | Especially if immunosuppressed |
What Should Be Done
- Echo — Look for pericardial/pleural effusion (key diagnostic finding)
- Inflammatory markers — CRP, ESR (usually elevated in PPS even if WBC is normal)
- Blood cultures — To rule out infection/endocarditis
- Chest X-ray — Pleural effusion, pulmonary infiltrates
- ECG — May show pericarditic changes (diffuse ST elevation, PR depression)
Treatment of PPS
- NSAIDs (e.g., ibuprofen 400–600 mg three times daily) — first-line
- Colchicine 0.5 mg twice daily for 1 month — added to NSAIDs; hastens recovery and reduces recurrence
- Corticosteroids — reserved for refractory or NSAID-contraindicated cases (but increase recurrence risk)
- The syndrome is generally self-limiting, but recurrences can occur
Treatment with combined NSAID + colchicine therapy is the standard of care. Most patients recover fully; tamponade develops in fewer than 2% of cases. — Fuster and Hurst's The Heart, 15th Edition / Goldman-Cecil Medicine
Bottom line: Recurrent episodic fever 3–4 months after bypass surgery with a normal WBC is most consistent with Postpericardiotomy Syndrome. The patient should be evaluated with an echocardiogram and inflammatory markers, and treated with NSAIDs + colchicine if confirmed. A cardiologist should be involved in ongoing management.
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