Fatal Clostridium septicum infection in a patient with non-Hodgkin's lymphoma undergoing multimodal oncologic therapy.

BACKGROUND: Clostridium septicum infections are rare but often fatal. They are known to be associated with a compromised immune system, e.g. with hematologic malignancies. CASE REPORT: We report on a spontaneous, non-traumatic C. septicum infection in a patient with non-Hodgkin's lymphoma undergoing irradiation due to abdominal bulk. Irradiation was delivered in daily fractions of 1.8 Gy. After 7 fractions, the patient suddenly developed severe pain in the lower leg. Clinical examination showed no pathological findings. However, a rapid progression of symptoms with motoric and sensoric deficits progressed rapidly within hours. Sizzling noise and gas entrainment were detectable about 9 h after the first symptoms. Despite immediate surgical treatment, and in the end amputation, the patient died 14 h later of septic shock. Histopathology showed gas gangrene in the leg tissue, with hemorrhagic muscular necrosis and enclosed gas vesicles. C. septicum was identified as causative organism. CONCLUSIONS: Irradiation as well as chemotherapy may have enhanced the risk by immunosuppression and induction of mucosal damage. Earlier antibiotic treatment might have slowed down the clinical course and thus given more time for correct diagnosis and treatment.

Quantification of aortic distensibility in abdominal aortic aneurysm using ECG-gated multi-detector computed tomography.

RATIONALE AND OBJECTIVES: To detect distensibility changes that might be an indicator for an increased risk of rupture, cross-sectional area changes of abdominal aortic aneurysms (AAA) have been determined using ECG-gated CT. MATERIALS AND METHODS: Distensibility measurements of the aorta were performed in 67 patients with AAA. Time-resolved images were acquired with a four detector-row CT system using a modified CT-angiography protocol. Pulsatility-related cross-sectional area changes were calculated above and at AAA level by semiautomatic segmentation; distensibility values were obtained using additional systemic blood pressure measurements. Values were compared for small Ø<5 cm (n=44) and large Ø>5 cm (n=23) aneurysms. RESULTS: The aorta could be segmented successfully in all patients. Upstream AAA distensibility D was significantly higher than at AAA level for both groups: means above AAA (at AAA) D(above)=(1.3+/-0.8) x 10(-5) Pa(-1) (D(AAA )=(0.6+/-0.5) x 10(-5) Pa(-1)) t-test p(D)<0.0001. Differences of the distensibility between smaller and larger aneurysms were not found to be significant. CONCLUSION: Distensibility can be measured non-invasively with ECG-gated CT. The reduction of distensibility within aneurysms compared to normal proximal aorta is subtle; the lack of difference between both small and large aneurysms suggests that this reduction occurs early in the aneurysm's development. Hence, reduced distensibility might be a predictive parameter in patients with high risk of aortic disease.

Age related changes of human aortic distensibility: evaluation with ECG-gated CT.

Aortic distensibility is a parameter to grade vascular diseases and age-related effects because it is related to the elastic properties of the vessel wall. In this study vascular cross-sectional area changes have been determined using ECG-gated CT to analyse the age dependency of aortic distensibility. Distensibility measurements of the aorta were performed in 31 subjects (28 to 85 years). Time-resolved images were acquired either with a 4- or 16-detector row CT system using a modified CT angiography protocol. Cross-sectional area changes of the aorta were calculated by semiautomatic segmentation, and distensibility values were obtained using additional systemic blood pressure measurements. The aorta could be segmented successfully in all subjects. A decrease of aortic distensibility with age was found (r=0.50). Below (above) the renal arteries, the annual decrease was Delta D ( infrarenal ) =(-2.1+/-0.7).10(-7 )Pa(-1)a(-1), (D ( suprarenal ) Delta=(-3.5+/-1.1).10(-7 )Pa(-1)a(-1)). Differences between the ages, the youngest third and oldest third studied, were found to be significant (P( suprarenal )=0.003; P( infrarenal )=0.025). An age-dependent decrease of aortic wall elasticity can be determined in a modified routine CT angiography study.