Meryl H. Mendelson

Tuberculosis in liver transplant patients

Tuberculosis has been increasing especially in urban areas and in immunosuppressed patients; however, the incidence and factors associated with tuberculosis in OLT patients are unknown. Five of 550 patients who underwent OLT at the Mount Sinai Medical Center during a 5-year period were noted to have tuberculosis. The mean age of the patients was 49.2 years; there were 3 males and 2 females and 3 were foreign born. One of 5 had a prior history of tuberculosis. Tuberculin skin tests performed before transplant revealed 1 positive and 2 anergic reactions. The preoperative chest x-ray revealed apical fibrosis in 2 patients and bilateral apical disease with a nodule in 1 patient. Tuberculosis developed from 2 to 57 months after surgery in 4/5 patients. One had miliary lesions of the peritoneum discovered at the time of OLT. One patient had recent contact with a patient with pulmonary tuberculosis. At presentation, fever was present in 4 of 5 patients, pulmonary lesions in 3 patients, meningitis in 2; during hospitalization, 1 had a liver abscess and disseminated intravascular coagulation and peripheral gangrene. Lymphocytosis was noted in the pleural (1), peritoneal (1), and cerebrospinal fluid (1). Acid-fast smears were positive in bronchoalveolar lavage fluid (1), peritoneal isolates (1), and liver biopsy (1). All patients had positive cultures for Mycobacterium tuberculosis. These isolates were all sensitive to isoniazid, streptomycin, rifampin, ethambutol, and pyrazinamide. Four of 5 patients were treated with isoniazid and rifampin, 2 received pyrazinamide, 2, amikacin, 2, ofloxacin, and 2, ethambutol. Three of 5 patients are doing well on antituberculous therapy and 2 expired with tuberculosis as the cause of death. In OLT patients with unexplained fever, tuberculosis including extrapulmonary and disseminated disease should be considered since the mortality rate is very high. Liver transplantation can be performed in the presence of active peritoneal tuberculosis with the use of judicious antituberculous therapy. The role of preventive therapy is controversial, though use in certain high risk patients is suggested.

Radiographic findings in progressive necrotizing malignant external otitis

Twenty‐three cases of progressive necrotizing (malignant) external otitis were reviewed. Radiographic evaluation was correlated with clinical disease. CT scanning accurately demonstrated subtle foci of involvement in the skull base which may be clinically unsuspected or go undetected with other studies. Central skull base erosion indicates advanced disease and selects those patients requiring extended antibiotic therapy. Soft tissue thickening of the parapharyngeal space and roof of the nasopharynx also implies advanced disease requiring prolonged therapy. Soft tissue improvement can be visualized on CT. While CT scanning demonstrates the progression of bony disease, it cannot be used to follow resolution of central skull base osteomyelitis. Radionuclide scans provide information regarding the overall extent of the inflammatory process.

Infectious Ocular Complications in Orthotopic Liver Transplant Patients

We report the frequency and type of infectious ocular complications following orthotopic liver transplantation (OLT) and review diagnostic and therapeutic strategies. During the period September 1988 through November 1994, 684 patients underwent OLT at Mount Sinai Hospital (New York). Nine orthotopic liver transplant patients (1.3%) developed ocular infections: Candida albicans endophthalmitis (2), Aspergillus fumigatus endophthalmitis (1), cytomegalovirus retinitis (4), herpes simplex virus keratitis (1), and varicella-zoster virus panophthalmitis (1). The mean time from OLT to ocular symptoms was 42 days for patients with fungal infections and 128 days for patients with viral infections. Blurred vision was the commonest symptom (five of nine cases). The mean duration of follow-up was 2 years (range, 33 days to 5 years). Permanent loss of vision occurred in three patients, five had improvement in visual acuity, and one died of disseminated aspergillosis 33 days after OLT. Infectious ocular complications following OLT may occur as isolated events or with disseminated disease. Fungal infections occur earlier (mean, 42 days after OLT) than viral infections (mean, 4 months after OLT). The clinical presentation may be atypical; aggressive vitreoretinal procedures and serial examinations may be required to establish the diagnosis. Cytomegalovirus retinitis in orthotopic liver transplant patients may not require life-long maintenance therapy with antiviral agents.

Pulmonary Toxoplasmosis in AIDS

In contrast to toxoplasmosis in non-AIDS immunocompromised hosts, AIDS patients rarely have been reported to be infected at extra-CNS sites. We report the case of a 45-year-old homosexual male with AIDS who presented with pneumonitis caused by Toxoplasma gondii following a previous illness consistent with CNS toxoplasmosis.

Infections associated with transhepatic biliary drainage devices

To determine the infectious complications associated with transhepatic biliary drainage devices, an analysis of the records of 38 patients who underwent placement of a pigtail catheter (n = 11), a Ring catheter/feeding tube (n = 13), or a Carey-Coons endoprosthesis (n = 15) was carried out. Nineteen infectious events occurred in 38 patients with 39 biliary devices. Infections consisted of bacteremia, cholangitis with and without documented bacteribilia, and intrahepatic abscesses and were frequently associated with obstruction (66.7 percent of infectious episodes). The most frequent organisms isolated from blood were Escherichia coli and Pseudomonas aeruginosa, and the most frequent organisms isolated from bile were P. aeruginosa, Klebsiella pneumoniae and Streptococcus faecalis. Trends for more frequent occurrence of neoplasms involving the gallbladder or biliary tract, recent surgical procedures and catheter manipulations in infected as compared with noninfected patients, and a delayed time to infection were noted in patients with an endoprosthesis.

Pharmacokinetics of Aztreonam in Healthy Elderly and Young Adult Volunteers

Aztreonam is a monobactam exhibiting an antibacterial spectrum similar to that of the aminoglycosides, with activity against aerobic gram‐negative bacilli, and is the only related drug that may be given to patients hypersensitive to beta‐lactams. The pharmacokinetics of aztreonam were compared in two groups of healthy volunteers. The young group comprised 10 adults between the ages of 18 and 30 years, and the elderly group included 10 adults older than 65 years of age. The two groups each received two doses (1 and 2 g) aztreonam, separated by 1 week. Although the mean peak serum concentrations of aztreonam for the two groups were similar, there were differences in other pharmacokinetic parameters. For example, for the 2‐g dose the mean half‐life (1.8 ± .51 versus 3.1 ± .9 hour), and area under the curve (AUC) (294.42 ± 64.08 versus 469.01 ± 144.02 μg × hour/mL per 1.73 m2) were less for the younger group compared with the elderly group. The mean total body clearance of aztreonam was greater for the younger than the elderly group. The results were similar to the pharmacokinetic parameters derived from the 1‐g dose. These results mirror the lower creatinine clearances and higher serum creatinine levels found in the elderly group. The data suggest that lower doses of aztreonam given at less frequent intervals may be appropriate in the elderly population.