A 32-year-old woman with acute pelvic inflammatory disease is hospitalized with fever (39.2°C), severe lower abdominal pain, and signs of peritonitis. She is hemodynamically unstable with tachycardia and hypotension. Which is the preferred inpatient IV antibiotic regimen?

Question

Accepted Answer

C. Clindamycin 900 mg IV every 8 hours + Gentamicin 2 mg/kg IV every 8 hours (± ampicillin for enterococci). ## Inpatient IV Regimen for Severe PID with Peritonitis

**Key Point:** For hospitalized PID with peritonitis and hemodynamic instability, the CDC recommends clindamycin + gentamicin (± ampicillin) as first-line IV therapy. This combination provides broad anaerobic, gram-negative, and gram-positive coverage.

### Rationale for Clindamycin + Gentamicin

1. **Clindamycin 900 mg IV Q8H** — excellent anaerobic coverage (critical in peritonitis); good pelvic penetration; covers gram-positive cocci.
2. **Gentamicin 2 mg/kg IV Q8H** — covers aerobic gram-negative rods including *E. coli*, *Klebsiella*, *Proteus*; synergistic with clindamycin.
3. **Ampicillin 2 g IV Q6H (optional)** — added if enterococcal coverage is desired (especially post-procedural or with bowel perforation).

### Spectrum Comparison

| Regimen | Anaerobes | Gram-Neg | Gram-Pos | Enterococcus | Chlamydia |
|---------|-----------|----------|----------|--------------|----------|
| Clindamycin + Gentamicin | ✓ | ✓ | ✓ | ✗ | ✗ |
| Clindamycin + Gentamicin + Ampicillin | ✓ | ✓ | ✓ | ✓ | ✗ |
| Cefotetan + Doxycycline | ✓ | ✓ | ✓ | ✗ | ✓ |
| Meropenem | ✓ | ✓ | ✓ | ✓ | ✗ |

**High-Yield:** Clindamycin + gentamicin is the CDC-preferred regimen for hospitalized PID with peritonitis. Doxycycline is added after clinical improvement to cover *Chlamydia* (step-down therapy).

**Mnemonic:** **CLINDA-GENT** = Clindamycin (anaerobes) + Gentamicin (gram-negatives) for severe intra-abdominal infection.

**Clinical Pearl:** Gentamicin dosing is weight-based and renal function–dependent. Peak and trough levels should be monitored in severe infection. Transition to oral doxycycline once fever resolves and oral intake is tolerated.

[cite:CDC STI Treatment Guidelines 2021; ACOG Practice Bulletin 110]

Answer

A. Fluoroquinolone (levofloxacin 750 mg IV daily) monotherapy

Answer

B. Cefotetan 2 g IV every 12 hours OR Cefoxitin 2 g IV every 6 hours + Doxycycline 100 mg IV/PO twice daily

Answer

D. Meropenem 1 g IV every 8 hours monotherapy

A 32-year-old woman with acute pelvic inflammatory disease is hospitalized with fever (39.2°C), severe lower abdominal pain, and signs of peritonitis. She is hemodynamically unstable with tachycardia and hypotension. Which is the preferred inpatient IV antibiotic regimen?

Explanation

Practice similar questions