The comparison of bolus tracking and test bolus techniques for computed tomography thoracic angiography in healthy beagles.

Computed tomography thoracic angiography studies were performed on five adult beagles using the bolus tracking (BT) technique and the test bolus (TB) technique, which were performed at least two weeks apart. For the BT technique, 2 mL/kg of 300 mgI/mL iodinated contrast agent was injected intravenously. Scans were initiated when the contrast in the aorta reached 150 Hounsfield units (HU). For the TB technique, the dogs received a test dose of 15% of 2 mL/kg of 300 mgI/mL iodinated contrast agent, followed by a series of low dose sequential scans. The full dose of the contrast agent was then administered and the scans were conducted at optimal times as identified from time attenuation curves. Mean attenuation in HU was measured in the aorta (Ao) and right caudal pulmonary artery (rCPA). Additional observations included the study duration, milliAmpere (mA), computed tomography dose index volume (CTDI[vol]) and dose length product (DLP). The attenuation in the Ao (BT = 660 52 HU ± 138 49 HU, TB = 469 82 HU ± 199 52 HU, p = 0.13) and in the rCPA (BT = 606 34 HU ± 143 37 HU, TB = 413 72 HU ± 174.99 HU, p = 0.28) did not differ significantly between the two techniques. The BT technique was conducted in a significantly shorter time period than the TB technique (p = 0.03). The mean mA for the BT technique was significantly lower than the TB technique (p = 0.03), as was the mean CTDI(vol) (p = 0.001). The mean DLP did not differ significantly between the two techniques (p = 0.17). No preference was given to either technique when evaluating the Ao or rCPA but the BT technique was shown to be shorter in duration and resulted in less DLP than the TB technique.

The effect of a basic home stimulation programme on the development of young children infected with HIV.

AIMS: The human immunodeficiency virus (HIV) potentially causes a significant encephalopathy and resultant developmental delay in infected children. The aim of this study was to determine whether a home-based intervention programme could have an impact on the neurodevelopmental status of children infected with HIV. METHOD: A longitudinal, randomized, controlled trial was conducted. A total of 122 children aged less than 2 years 6 months were assigned to either a comparison or an experimental group. Children in the experimental group were given a home stimulation programme that was updated every 3 months. The home programme included activities to promote motor, cognitive, and speech and language development. Children in the comparison group received no developmental intervention. Children were assessed by a blinded assessor at baseline, 6 months, and 12 months using the Bayley Scales of Infant Development, 2nd edition. RESULTS: The children in this study came from poor socioeconomic backgrounds and their nutritional status was suboptimal. The experimental group included 60 children (30 males, 30 females) with a mean age of 18 months (SD 8.1 mo). The comparison group included 62 children (32 males, 30 females) with a mean age 19 months (SD 8.2 mo). Cognitive and motor development were severely affected at baseline, with 52% of the children having severe cognitive delay and 72% having severe motor delay at baseline. Children in the experimental group showed significantly greater improvement in cognitive (p=0.010) and motor (p=0.020) development over time than children in the comparison group. INTERPRETATION: A home stimulation programme taught to the caregiver can significantly improve cognitive and motor development in young children infected with HIV.

Anesthetic technique (sufentanil versus ketamine plus midazolam) and quantitative electroencephalographic changes after cardiac surgery.

OBJECTIVES: Cardiac surgery involving cardiopulmonary bypass is associated with neurologic deterioration. Several interventions, including anesthetic techniques, have been designed to limit ischemic brain damage and have been evaluated in animals. Markers of neurologic injury may facilitate the assessment of these interventions in humans. DESIGN: A blinded randomized prospective study comparing 2 anesthetic techniques (one sufentanil-based, the other ketamine and midazolam-based) in patients undergoing cardiac surgery. Quantitative electroencephalography was used to detect postoperative neurologic injury. SETTING: Major teaching hospital. PARTICIPANTS: Forty-two patients aged 18 to 70 years undergoing cardiac surgery. INTERVENTIONS: Patients were anesthetized with either a sufentanil-based or a ketamine and midazolam-based technique for cardiac surgery with cardiopulmonary bypass. Quantitative electroencephalography was performed preoperatively as well as 5 to 6 days postoperatively. MEASUREMENTS AND MAIN RESULTS: Quantitative electroencephalography outcome did not differ (p > 0.05) between the 2 groups. It showed significant deterioration between preoperative and postoperative assessments with a decrease in faster and an increase in slower frequencies. In addition, the alpha attenuation index decreased. This may reflect a decrease in alertness. Both the intergroup comparisons and the assessment of individual changes failed to reveal significant differences between the anesthetic techniques. The adjuvant use of isoflurane correlated with less deterioration of quantitative electroencephalographic variables. CONCLUSIONS: The use of either sufentanil-based or ketamine and midazolam-based anesthetic techniques for cardiac surgery with cardiopulmonary bypass had no effects on a marker of postoperative neurologic injury (ie, quantitative electroencephalography).

Maxillary sinus pathology in 119 patients--a histopathologic study.

INTRODUCTION: Information on histopathological changes within sinus mucosa is lacking, both in the general population, and in subjects with specific facial morphology and chronic respiratory obstruction. AIMS AND OBJECTIVES: To provide baseline data of the frequency and nature of pathological changes in the maxillary sinus in a specified group of patients. METHODS: 119 patients undergoing elective maxillary osteotomies were selected. These included patients with (70) and without (49) vertical maxillary excess (VME), and mouth and nasal breathers. The frequency and nature of the histopathological changes within the maxillary antral lining were recorded. RESULTS: Patients ranged from 13 to 47 years, with a M:F ratio of 1:2.4. The findings included congestion (95%), submucosal oedema (90%), retention cysts (26%), true polyps (4.6%) and inflammation. There was eosinophilia (68%), basement membrane thickening (28%), goblet cell hyperplasia (95%) and dystrophic calcification (59%). CONCLUSIONS: A significant degree of sinus pathology was found in this specified group of patients. This was probably due to their living in a polluted urban environment. In the presence of such widespread pathological changes and the virtual impossibility of obtaining "normal" control tissue, investigators may find it impossible to correlate maxillary sinus pathology with either facial form or breathing pattern.

Nitric oxide metabolites in naturally occurring canine babesiosis.

Babesiosis, caused by the virulent haemoprotozoan parasite Babesia canis rossi, is an important disease of dogs in South Africa. The nitric oxide metabolites, nitrate and nitrite (collectively termed reactive nitrogen intermediates or RNIs) were measured in admission sera from dogs in a babesiosis-endemic area. Five groups were prospectively studied: mild uncomplicated (n=9), severe uncomplicated (severe anaemia) (n=10) and complicated babesiosis (n=11); and two groups of healthy aparasitaemic dogs: endemic controls from the study area (n=10) and experimental dogs kept in tick-free conditions (n=10). Four measures of RNI production were studied: (i) serum RNI; (ii) serum RNI/creatinine ratio; (iii) fractional clearance of RNI (FC(RNI)); (iv) fractional excretion of RNI (FE(RNI)). Marked elevations of serum RNI occurred in only two dogs, both in the severe uncomplicated group. The highest concentration (log value 5.29 micromol/l) was in a dog that died, but concentrations in the other four dogs that died were unremarkable (0, 0.34, 1.66 and 2.64 micromol/l). Age, appetite and free serum haemoglobin were significant covariates for measures of RNI production. There were no significant differences among the babesiosis groups for serum RNI. Adjustment for creatinine had minor effects on the results. All babesiosis groups had significantly higher serum RNI and RNI/creatinine than the tick-free control group, but did not differ from the endemic controls except for the severe uncomplicated group, which had higher RNI/creatinine. The complicated group had significantly lower FC(RNI) and FE(RNI) than all other groups, except for the tick-free control group, which had similar FE(RNI). The results indicate that, in an endemic area, measures of RNI production are unlikely to be useful indicators of severity or outcome in canine babesiosis.