Postoperative Complications with Timeline

Timeline Overview

Detailed Breakdown by System

🫁 Pulmonary — "Wind"

• Most common cause of fever in the first 24–48 hours post-op
• Results from shallow breathing, retained secretions, poor pulmonary toilet
• Treat with incentive spirometry, deep breathing, ambulation
• Discharge unless ill or hypoxemic

• Develops from persistent atelectasis and secretion retention
• Polymicrobial; aspiration-type pathogens common
• Usually requires admission for IV antibiotics
• Significantly increases 30-day mortality (1% → 6.4%)

• Dyspnea is the predominant symptom
• Requires high index of suspicion; often clinically silent until significant
• Confirm with CT-PA; manage with anticoagulation

• Consider in any patient with pleuritic chest pain after thoracic or central line procedures

💧 Urinary — "Water"

• Most often from indwelling catheter ≥ 3 days
• Dysuria, frequency, positive urine culture
• Treat with oral antibiotics, usually discharged

• Lower abdominal discomfort, inability to void
• Confirm with bladder ultrasound; drain with Foley
• No need for prolonged catheterization if renal function is normal

• Prerenal (most common): volume depletion → fluid bolus
• Intrinsic: ATN, nephrotoxic drugs
• Postrenal: obstruction — place Foley (diagnostic + therapeutic)

🩹 Wound — "Wound"

• Poor hemostasis → pain, swelling, sanguineous drainage
• Remove a few sutures, drain, culture
• Caution with neck hematomas (airway risk) and post-vascular surgery

• Painless swelling, clear fluid
• Results from inadequate lymphatic control
• Needle aspiration is diagnostic and therapeutic

• Increasing pain, erythema, swelling, purulent drainage
• Non-GI wounds: usually S. aureus or Streptococcus
• GI/GU wounds: polymicrobial (Gram-negatives + anaerobes)
• Treatment: open, drain, culture; antibiotics based on site

• Group A Streptococcus, S. aureus, or mixed aerobic-anaerobic
• Pain out of proportion to exam findings — cardinal sign
• Risk factors: DM, obesity, immunosuppression, PVD
• CT: gas tracking along fascial planes; MRI sensitive
• Emergency surgical debridement + triple antibiotics (penicillin/cephalosporin + aminoglycoside + clindamycin)

• Superficial or deep fascial
• Caused by poor closure, malnutrition, steroids, diabetes
• Abdominal dehiscence → risk of evisceration → urgent surgical exploration

🚶 DVT — "Walking"

• Leg pain, swelling, warmth
• Diagnosis: Doppler ultrasound (first-line)
• Treat: anticoagulation
• Repeat Doppler in 3 days if initial negative but symptoms persist

💊 Drug-Related — "Wonder Drugs"

• Common cause of fever without localizing signs
• Many drug classes implicated (antibiotics, heparin, phenytoin)
• Management: stop suspected agent, change catheters

• After any antibiotic use (even short courses)
• Watery ± bloody diarrhea
• Dx: stool for C. difficile toxin
• Treat: metronidazole or oral vancomycin; severe cases: IV vancomycin ± fidaxomicin

🫀 GI Complications

• Absent bowel sounds, distension, inability to pass flatus
• Common after abdominal surgery; usually resolves with ambulation, bowel rest

• Fever + abdominal tenderness + leukocytosis, typically > 5 days post-op
• CT is gold standard for diagnosis
• Treatment: CT-guided drainage + broad-spectrum antibiotics

• After bowel resection, typically days 4–7
• Severe abdominal pain, peritonitis, systemic sepsis
• Surgical emergency

• Fever, leukocytosis, prolonged ileus, wound drainage
• Usually iatrogenic after abdominal surgery

• Usually in elderly, critically ill patients
• RUQ pain, fever, elevated LFTs; US shows thickened gallbladder without stones
• Requires cholecystostomy or cholecystectomy

Summary Timeline (Visual)

Post-op Hours/Days
──────────────────────────────────────────────────────────────
< 24 h    │ Atelectasis │ Early wound infection (Strep/Clostridium)
Day 1–3   │ Hematoma │ Seroma │ Drug reactions │ UTI (begins)
Day 2–5   │ Pneumonia │ UTI │ Ileus
Day 4–6   │ DVT / PE │ Anastomotic leak
Day 5–7   │ Wound infection (SSI) │ Intra-abdominal abscess
Day 5–10  │ Enterocutaneous fistula
Any time  │ C. difficile │ Drug fever │ ARF │ PE │ Necrotizing fasciitis
──────────────────────────────────────────────────────────────

• Tintinalli's Emergency Medicine, Chapter 87 — Complications of General Surgical Procedures
• Tintinalli's Emergency Medicine, Chapter 105 — Postoperative Gynecologic Complications
• Goldman-Cecil Medicine — Postoperative Fever