A Randomized Steady-State Bioavailability Study of Synthetic versus Natural (Kiwifruit-Derived) Vitamin C

Whether vitamin C from wholefoods has equivalent bioavailability to a purified supplement remains unclear. We have previously showed that kiwifruit provided significantly higher serum and tissue ascorbate levels than synthetic vitamin C in a genetically vitamin C-deficient mouse model, suggesting a synergistic activity of the whole fruit. To determine if these results are translatable to humans, we carried out a randomized human study comparing the bioavailability of vitamin C from kiwifruit with that of a vitamin C tablet of equivalent dosage. Thirty-six young non-smoking adult males were randomized to receive either half a gold kiwifruit (Actinidia Chinensis var. Hort 16A) per day or a comparable vitamin C dose (50 mg) in a chewable tablet for six weeks. Ascorbate was monitored weekly in fasting venous blood and in urine, semen, leukocytes, and skeletal muscle (vastus lateralis) pre- and post-intervention. Dietary intake of vitamin C was monitored using seven day food and beverage records. Participant ascorbate levels increased in plasma (P < 0.001), urine (P < 0.05), mononuclear cells (P < 0.01), neutrophils (P < 0.01) and muscle tissue (P < 0.001) post intervention. There were no significant differences in vitamin C bioavailability between the two intervention groups in any of the fluid, cell or tissue samples tested. Overall, our study showed comparable bioavailability of synthetic and kiwifruit-derived vitamin C.     

Attitudes of pregnant women and male partners towards non-invasive prenatal testing and widening the scope of prenatal screening

Non-invasive prenatal testing (NIPT) and its potential to test for multiple disorders has received much attention. This study explores attitudes of women and men towards NIPT, and their views on widening the scope of prenatal testing in a country with a low uptake of prenatal screening (The Netherlands). Five focus groups with low-risk pregnant women (n=28), three focus groups with men (n=19) and 13 interviews with high- and low-risk pregnant women were conducted. Participants felt that current prenatal screening has great disadvantages such as uncertain results and risk of miscarriage from follow-up diagnostics. Characteristics of NIPT (accurate, safe and early testing) could therefore diminish these disadvantages of prenatal screening and help lower the barrier for participation. This suggests that NIPT might allow couples to decide about prenatal testing based mostly on their will to test or not, rather than largely based on fear of miscarriage risk or the uncertainty of results. The lower barrier for participation was also seen as a downside that could lead to uncritical use or pressure to test. Widening the scope of prenatal testing was seen as beneficial for severe disorders, although it was perceived difficult to determine where to draw the line. Participants argued that there should be a limit to the scope of NIPT, avoiding testing for minor abnormalities. The findings suggest that NIPT could enable more meaningful decision-making for prenatal screening. However, to ensure voluntary participation, especially when testing for multiple disorders, safeguards on the basis of informed decision-making will be of utmost importance.     

Neurologic outcome of surgical and conservative treatment of rheumatoid cervical spine subluxation: A systematic review

Objective

Rheumatoid arthritis commonly involves the upper cervical spine and can cause significant neurologic morbidity and mortality. However, there is no consensus on the optimal timing for surgical intervention: whether surgery should be performed prophylactically or once neurologic deficits have become apparent.

Methods

A systematic review of the literature was performed to analyze neurologic outcome (Ranawat) and survival time (Kaplan‐Meier) after surgical or conservative treatment using the MOOSE (Meta‐analysis Of Observational Studies in Epidemiology) and GRADE (Grading of Recommendations, Assessment, Development and Evaluation system) criteria.

Results

Twenty‐five observational studies were selected. No randomized controlled trials (RCTs) could be found. All of the studies had a high risk of bias. Twenty‐three studies reported the neurologic outcome after surgery for 752 patients. Neurologic deterioration rarely occurred in Ranawat I and II patients. Ranawat III patients did not fully recover. The 10‐year survival rates were 77%, 63%, 47%, and 30% for Ranawat I, II, IIIA, and IIIB, respectively. The Ranawat IIIB patients had a significantly worse outcome. Another 185 patients treated conservatively were described in 7 studies. Neurologic deterioration rarely occurred in Ranawat I patients, but was almost inevitable in Ranawat II, IIIA, and IIIB patients. The Kaplan‐Meier analysis showed a 10‐year overall survival rate of 40%.

Conclusion

There are no RCTs that compared surgery with conservative treatment. In observational studies, surgical neurologic outcomes were better than conservative treatment in all patients with cervical spine involvement, and in asymptomatic patients with no neurologic impairment (Ranawat I) the outcomes were similar; however, the evidence is weak. Survival time of surgical and conservative treatment could not be compared.     

Prevalence and characteristics of moral case deliberation in Dutch health care

The attention for Moral case deliberation (MCD) has increased over the past years. Previous research on MCD is often written from the perspective of MCD experts or MCD participants and we lack a more distant view to the role of MCD in Dutch health care institutions in general. The purpose of this paper is to provide an overview of the state of the art concerning MCD in the Netherlands. As part of a larger national study on clinical ethics support in the Netherlands, we will focus on the prevalence and characteristics of MCD in Dutch health. A mixed methods design was used in which we combined two survey questionnaires (sent to all health care institutions), two focus groups and 17 individual interviews with top managers or ethics support staff. The findings demonstrate that the prevalence of MCD is relatively high in Dutch health care (44 % has MCD), especially in mental health care (in which MCD is mentioned as present in the organization by 62 % of the respondents). Institutions with MCD differ from institutions without MCD concerning size, kind of problems and importance of ideological background. Characteristic of MCD is that it often exists for 3 years or more, has a high participation of health professionals and middle managers and is both organized scheduled as unscheduled. As well integration in existing policy as key persons emerge as important issues in relation to the positioning of MCD. We conclude that MCD is a part of an integrated ethics policy and serves as a (bottom up) catalyst for such an integrated ethics policy.