Department of Rheumatology and Clinical Immunology and
1 Department of Intensive Care and Toxicology, University Medical Centre, Utrecht, The Netherlands
Correspondence to:
A. A. M. Blaauw.
SIR, Infections are a major source of morbidity and mortality in patients with systemic lupus erythematosus (SLE) [13]. Among the most common opportunistic bacterial infections seen in SLE are those caused by Salmonella, especially S. typhimurium and S. enteritidis. Extra-intestinal infections seem to have been reported more frequently [4, 5]. We describe a patient with SLE and S. enteritidis bacteraemia complicated by rhabdomyolysis and cholecystitis.
A 27-yr-old Caucasian woman was admitted to the intensive care unit because of high fever (41°C) and somnolence in September 1998. In 1996, SLE was diagnosed on the basis of the characteristic butterfly rash, alopecia, polyarticular arthritis, haemolytic anaemia, myositis, oral ulcers, positive antinuclear antibodies and positive anti-double-stranded DNA (anti-dsDNA) antibodies. Despite extensive treatment with oral corticosteroids and azathioprine, she continued to suffer from arthritis and arthralgia and was highly positive for anti-dsDNA. She was started on hydroxychloroquine in August 1998. On the day of admission, a friend found her, barely conscious. Two days before admission she had complained of a severe headache, pale stools, and a rash. On admission, she appeared very ill. Her Glasgow Coma Scale was E4M6V4, APACHE score II 20. Her temperature rose to 40.6°C. Her blood pressure and pulse were 106/86 mmHg and 140 beats/min, respectively. She had `rose' spots on her abdomen and legs. Tenderness in the right upper abdomen was noted on palpation. Bowel sounds were present. Neurological examination was difficult. No signs of meningism were noted. She followed commands reliably and tried to answer questions. Palpation of muscles was painful and considerable loss of muscular strength was apparent in the proximal as well as distal muscles of upper and lower extremities. Haematological laboratory findings and blood chemistry values on the day of admission and subsequent days are shown in Table 1. No HowellJolly bodies were found in a red blood cell smear. Fibrinogen was 7.0 g/l (normal value 2.04.0 g/l) and fibrin degradation products were 2.0 mg/l (normal value <0.5 mg/l). Lumbar puncture did not reveal abnormalities. Urinalysis did not show any hyaline or erythrocyte casts, but was positive for myoglobin. Lactate was normal (<2.5 mmol/l) as was a blood gas analysis. IgG and IgA concentrations were 7.3 and 1.2 g/l, IgM was low (0.7 g/l). Complement C3 and C4 levels were 1.34 and 0.26 g/l (normal values), respectively. Severe bacterial infection and bacteraemia complicated by disseminated intravascular coagulation were suspected and she was started on intravenous ceftriaxone. Vigorous hydration was started. Corticosteroids were given intravenously. Azathioprine and hydroxychloroquine were discontinued temporarily. The first day after admission, several blood, urine and stool cultures revealed S. enteritidis and she was started on intravenous ciprofloxacin. The patient seemed to respond to antibiotic therapy but remained weak and experienced increasing abdominal pain with tenderness in the right upper quadrant. Laboratory examination showed an increasing creatine phosphokinase (CK) level with a maximum of 45429 U/l on the fourth day after admission, and a maximum myoglobin of 3270 µg/l. Owing to adequate fluid replacement, and alkalization (urine pH 6.5) by means of sodium bicarbonate, renal function did not deteriorate; it remained stable at 67 µmol/l after 4 days. Sixteen days after admission, CK returned to normal. Ultrasonographic examination on the second day after admission showed signs of cholecystitis and a single bile stone; cholecystectomy was performed. Microscopic examination revealed cholecystitis and activated macrophages. Bile cultures remained negative. On the fourth day after admission she was transferred to the Department of Rheumatology and Clinical Immunology. She appeared well but weak and physical therapy was started. Clinically, no signs of active lupus erythematosus were noted. Anti-dsDNA remained elevated, on average 400 IU/ml (Farr assay). No increase in anti-dsDNA during this infectious period was noted. Azathioprine and hydroxychloroquine were resumed and oral corticosteroids were continued. Ciprofloxacin was stopped after 21 days. She was discharged home after 34 days without any devices.
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In summary, we have described a 27-yr-old SLE patient with S. enteritidis bacteraemia complicated by disseminated intravascular coagulation and extra-intestinal manifestations, such as urinary tract infection, acute cholecystitis and rhabdomyolysis.
References