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Pyomyositis. Report of 18 cases in Hawaii
Abstract:
Eighteen patients with pyomyositis were seen at a large hospital in Hawaii. Most were healthy young men or boys, and eight had never traveled abroad. Fever, muscle pain and swelling, and leukocytosis were common, but only seven had erythema or fluctuance. A single large muscle was infected in 14, and two to three muscles were infected in the others. Pyomyositis mimicked cellulitis, muscle hematoma, thrombophlebitis, appendicitis, and neoplasm. Staphylococcus aureus was found in 13, and Streptococcus pyogenes was found in two. Bacteremia occurred in 29% (5/17). Drainage and antimicrobial agents were usually effective therapy, but one patient died and another had CNS damage. The pathogenesis is uncertain, but 12 had nonpenetrating muscle injury and 13 had pyoderma, suggesting that bacteria invade injured muscle via the bloodstream or lymphatic system.
Insights
Pyomyositis, a bacterial muscle infection, commonly affects young men in Hawaii. Prompt drainage and antibiotics are key treatments, though complications like CNS damage can occur.
Area of Science:
- Infectious Diseases
- Musculoskeletal Disorders
- Tropical Medicine
Background:
- Pyomyositis is a serious bacterial infection of muscle, often presenting with non-specific symptoms.
- It can mimic various other conditions, leading to diagnostic challenges.
- Understanding its epidemiology and risk factors is crucial for early diagnosis and treatment.
Purpose of the Study:
- To describe the clinical characteristics, causative agents, and outcomes of pyomyositis cases.
- To identify potential risk factors and pathogenesis of pyomyositis.
- To evaluate the effectiveness of current treatment modalities.
Main Methods:
- Retrospective case series of 18 patients diagnosed with pyomyositis at a Hawaiian hospital.
- Data collected included patient demographics, clinical presentation, laboratory findings, imaging results, causative organisms, treatment, and outcomes.
- Analysis of potential risk factors such as muscle injury and skin infections.
Main Results:
- The study identified 18 cases of pyomyositis, predominantly affecting healthy young males.
- Common symptoms included fever, myalgia, and leukocytosis; erythema and fluctuance were infrequent.
- Staphylococcus aureus was the most common pathogen identified. Bacteremia occurred in 29% of patients.
- Single muscle involvement was noted in 14 patients, with two to three muscles infected in the remainder.
- Differential diagnoses considered included cellulitis, hematoma, thrombophlebitis, appendicitis, and neoplasm.
- Treatment with drainage and antibiotics was generally effective, but mortality and CNS damage were reported in some cases.
- Potential risk factors identified were nonpenetrating muscle injury (12 patients) and pyoderma (13 patients).
Conclusions:
- Pyomyositis in Hawaii primarily affects young males and can present with diverse symptoms, often mimicking other conditions.
- Early diagnosis and treatment involving surgical drainage and antimicrobial therapy are essential for favorable outcomes.
- The pathogenesis may involve bacterial seeding of injured muscle tissue, potentially via hematogenous or lymphatic spread.
- Further research into the specific pathogenesis and preventative strategies is warranted.