Synthesis of meta-substituted arene bioisosteres from [3.1.1]propellane

Small-ring cage hydrocarbons are popular bioisosteres (molecular replacements) for commonly found para-substituted benzene rings in drug design1. The utility of these cage structures derives from their superior pharmacokinetic properties compared with their parent aromatics, including improved solubility and reduced susceptibility to metabolism2,3. A prime example is the bicyclo[1.1.1]pentane motif, which is mainly synthesized by ring-opening of the interbridgehead bond of the strained hydrocarbon [1.1.1]propellane with radicals or anions4. By contrast, scaffolds mimicking meta-substituted arenes are lacking because of the challenge of synthesizing saturated isosteres that accurately reproduce substituent vectors5. Here we show that bicyclo[3.1.1]heptanes (BCHeps), which are hydrocarbons for which the bridgehead substituents map precisely onto the geometry of meta-substituted benzenes, can be conveniently accessed from [3.1.1]propellane. We found that [3.1.1]propellane can be synthesized on a multigram scale, and readily undergoes a range of radical-based transformations to generate medicinally relevant carbon- and heteroatom-substituted BCHeps, including pharmaceutical analogues. Comparison of the absorption, distribution, metabolism and excretion (ADME) properties of these analogues reveals enhanced metabolic stability relative to their parent arene-containing drugs, validating the potential of this meta-arene analogue as an sp3-rich motif in drug design. Collectively, our results show that BCHeps can be prepared on useful scales using a variety of methods, offering a new surrogate for meta-substituted benzene rings for implementation in drug discovery programmes.

Providing pharmacy support to housebound patients: learning from the COVID-19 pandemic

Introduction

Housebound patients may face challenges to their medicines management due to reduced household mobility and potential lack of access to healthcare services. Previous literature has explored the medication-related needs of housebound patients from pharmacists’ perspectives (1-2). However little work has focussed on the patient/family perspective. In this study, we used data obtained from those staying at home as much as possible during the COVID-19 pandemic to fill this gap.

Aim

To explore home medicine practices and safety for people who were housebound during the COVID19 pandemic and to create guidance, from the patient/family perspective, for enabling pharmacists to facilitate safe medicine practices for this population.

Methods

Interviews were carried out with people who were taking at least one long term medication and met the criteria for ‘shielding’ and/or were over 70 years of age during the first wave of the COVID-19 pandemic in the UK and/or their family carers. Respondents were recruited through patient and public involvement representatives, the research team’s networks, and support groups. Potential participants were approached via personal contact and social media. Interviews were conducted by telephone or video conferencing and participants asked about their medicines management while staying at home. Inductive thematic analysis was carried out. Patient and public involvement representatives were involved in the data analysis alongside the researchers.

Results

Fifty people were interviewed (16 males, 34 females; mean age 68 years, range 26–93 years). Interview data suggested diversity of experiences of medicines management while staying at home. Some respondents reported no or little change, others an initial crisis followed by re-stabilisation, and others that the pandemic was a tipping point, exacerbating underlying challenges and having negative effects on their health and wellbeing. Medicine safety issues reported included omitted doses and less-effective formulations being used. Participants also described experiencing high levels of anxiety related to obtaining medicines, monitoring medicines and feeling at risk of contracting COVID-19 while accessing medicine-related healthcare services. Key factors identified as facilitating a smooth transition included patients’ own agency, support from family, friends and community, good communication with pharmacy staff, continuity of pharmacy services and synchronisation of medicines supply so that a maximum of one collection/delivery was required each month.

Conclusion

The study findings that we have presented relate to the UK only; this may limit the generalisability of our findings to other countries. Findings from Ireland are in the process of being analysed and will provide a basis of comparison. In addition, more females took part than males, despite efforts to address this. However, our findings suggest pharmacy staff can support medicines management for people who are housebound by synchronisation of medicines supply, delivering medicines where possible, developing/raising awareness of alternative means of communication, providing continuity of pharmacy services and signposting any community support available.

References

(1) Kayyali R, Funnell G, Harrap N, Patel A. Can community pharmacy successfully bridge the gap in care for housebound patients? Research in Social and Administrative Pharmacy 2019;15:425-439.

(2) Latif A, Mandane B, Anderson E, Barraclough C, Travis S. Optimizing medicine use for people who are homebound: an evaluation of a pilot domiciliary Medicine Use Review (dMUR) service in England. Integr Pharm Res Pract 2018;7:33-40.

Optimization of a Series of 2,3-Dihydrobenzofurans as Highly Potent, Second Bromodomain (BD2)-Selective, Bromo and Extra-Terminal Domain (BET) Inhibitors

Herein, a series of 2,3-dihydrobenzofurans have been developed as highly potent bromo and extra-terminal domain (BET) inhibitors with 1000-fold selectivity for the second bromodomain (BD2) over the first bromodomain (BD1). Investment in the development of two orthogonal synthetic routes delivered inhibitors that were potent and selective but had raised in vitro clearance and suboptimal solubility. Insertion of a quaternary center into the 2,3-dihydrobenzofuran core blocked a key site of metabolism and improved the solubility. This led to the development of inhibitor 71 (GSK852): a potent, 1000-fold-selective, highly soluble compound with good in vivo rat and dog pharmacokinetics.

Medication-related harm and the newspapers - what has been communicated to the public in Ireland: A systematic content analysis

Introduction

Reducing the global prevalence of severe, avoidable medication-related harm (MRH) by 50% by the end of 2022 is the WHO’s third global patient safety challenge [1]. MRH is reported frequently in the academic literature, with increasing age being a key risk factor. The WHO have highlighted the need to improve public health literacy and knowledge about medications. Little is known about the frequency and nature of Irish newspaper reports about MRH. This study sought to address this gap and to examine reporting during the calendar years 2019 and 2009.

Methods

In this mixed-methods study, LexisNexis® [2], an online newspaper archive database, was searched for newspaper articles reporting on MRH, published in the Republic of Ireland during the calendar years 2019 and 2009. The search strategy focussed on “medication” AND “harm” AND “patient”. Quantitative data extraction aimed to describe the frequency (by count of articles) of reporting of MRH and the nature by describing the publishing newspaper titles and the reported details of: drug class(es), demographics (age or life stage, gender) of those experiencing harm and the severity of harm. Qualitatively, a systematic content analysis, using inductive coding is ongoing and will be reported separately. Research ethics committee approval for this study is not required because this is an analysis of material in the public domain.

Results

In total, 7098 newspaper articles were identified through database searching for 2019 (n=3217) and 2009 (n=3881). To date, 54% (3867: n=3217, 45% 2019, n=650, 9% 2009) of these were screened, of which 63 newspaper articles (n=44 2019, n=19 2009) were included and quantitative data were extracted. Within these 63 articles, 71 cases of individual people experiencing MRH were reported (52 in 2019 and 19 in 2009). The newspapers most commonly reporting MRH were Irish Daily Mail (31/63: 27 in 2019 and 4 in 2009) and Irish Times (17/63:9 in 2019 and 8 in 2009). Drug classes most frequently reported as causing MRH were central nervous system drugs (antiepileptics n=10, opioid analgesics n=5, antidepressants n=9, and anxiolytics n=1), cancer chemotherapy (23 cases) and non-steroidal anti-inflammatories (n=3). MRH was reported as being fatal (13 /71:8 in 2019 and 5 in 2009) and non-fatal (58/71), with seven cases (5 in 2019 and 2 in 2009) of permanent harm. Among the 71 individual cases of MRH, the majority were adults aged 18–64 years (n=36), children (n=7), older adults (n=8), foetus (n=3) and newborn (n=1), while the remainder did not report the person’s age.

Conclusion

MRH is frequently reported to the public through Irish newspapers. The study is limited by focus on newsprint media with the exclusion of other forms of digital or social media and restriction to two calendar years in a single country, which likely stifles the generalisability of findings to other contexts. Future work could explore this issue across a wider range of media platforms and examine changes in reporting over time. The study findings may support an agenda to improve the general public's exposure to information and knowledge of MRH and medication safety.

References

1. Donaldson, L.J., et al., Medication without harm: WHO's third global patient safety challenge. 2017. 389(10080): p. 1680–1681.

2. https://advance-lexis-com.elib.tcd.ie/firsttime?crid=d5f713e8-8107-4efd-91cc-1e99c82cdb58&pdmfid=1519360.

Artificial neural network based isotopic analysis of airborne radioactivity measurement for radiological incident detection

Responders need tools to rapidly detect and identify airborne alpha radioactivity during consequence management scenarios. Traditional continuous air monitoring systems used for this purpose compute the net counts in various energy windows to determine the presence of specified isotopes, such as ²³⁵U, ²³⁹Pu, and ²⁴¹Am. These calculations rely on having a well-calibrated detector, which is challenging in low-background environments. Here, an alternative approach of using artificial neural networks to classify alpha spectra is presented. Two network architectures, fully connected and convolutional neural networks (CNNs), were trained to classify alpha spectra into four categories: background and background plus the three isotopes above. Sources were injected into measured background at various fractions of the derived response level (DRL) corresponding to early-phase Protective Action Guides. The convolutional network identifies all sources at 1% of the DRL with average probability of detection of 95% and false alarm probability of 1%. Further, the network identifies sources ranging between 0.25% and 1% of the DRL with higher than 80% probability of detection and lower than 7% false alarm probability. Most significantly, the network performance improves in low-count background conditions, increasing its minimum probability of detection to 93% and reducing the false alarm probabilities to lower than 0.25%. These results show that, once trained on datasets representing a range of detection scenarios, artificial neural networks can accurately identify alpha isotopes of interest without the need for detector calibration.

Agreement between renal prescribing references and determination of prescribing appropriateness in hospitalized patients with chronic kidney disease

BACKGROUND

Chronic kidney disease (CKD) is a risk factor for adverse drug events. The clinical significance of discordance between renal prescribing references is unknown.

AIM

We determined the prevalence of potentially inappropriate prescribing (PIP) in CKD, measured agreement between two prescribing references, and assessed potential for harm consequent to PIP.

DESIGN

Single-centre observational study.

METHODS

A random sample of hospitalized patients with CKD were grouped according to baseline CKD stage (3, 4, or 5). Prescriptions requiring caution in CKD were referenced against the Renal Drug Handbook (RDH) and British National Formulary (BNF) to identify PIP (non-compliance with recommendations). Inter-reference agreement was measured using percentage agreement and Kappa coefficient. Potential for harm consequent to PIP was assessed by physicians and pharmacists using a validated scale. One-year mortality was compared between patients with or without PIP during admission.

RESULTS

Among 119 patients (median age 73 years, 50% male), 136 cases of PIP were identified in 78 (65.5%) patients. PIP prevalence, per patient, was 64.7% using the BNF and 28.6% using the RDH (fair agreement, Kappa 0.33, P <  0.001). The majority (63.2%) of PIP cases detected exclusively by the BNF carried minimal or no potential for harm. PIP was not significantly associated with one-year mortality (34.7% vs. 21.1%, P = 0.14).

CONCLUSIONS

PIP was common in hospitalized patients with CKD. Substantial discordance between renal prescribing references was apparent. The development of universally-adopted, evidence-based, prescribing guidelines for CKD might optimize medications safety in this vulnerable group.

Survey of medication documentation at hospital discharge: implications for patient safety and continuity of care

BACKGROUND

Medication discrepancies at the time of hospital discharge are common and can result in error, patient/carer inconvenience or patient harm. Providing accurate medication information to the next care provider is necessary to prevent adverse events.

AIMS

To investigate the quality and consistency of medication details generated for such transfer from an Irish teaching hospital.

METHODS

This was an observational study of 139 cardiology patients admitted over a 3 month period during which a pharmacist prospectively recorded details of medication inconsistencies.

RESULTS

A discrepancy in medication documentation at discharge occurred in 10.8% of medication orders, affecting 65.5% of patients. While patient harm was assessed, it was only felt necessary to contact three (2%) patients. The most common inconsistency was drug omission (20.9%).

CONCLUSIONS

Inaccuracy of medication information at hospital discharge is common and compromises quality of care.

Dynamics of viral and proviral loads of feline immunodeficiency virus within the feline central nervous system during the acute phase following intravenous infection

Animal models of human immunodeficiency virus 1, such as feline immunodeficiency virus (FIV), provide the opportunities to dissect the mechanisms of early interactions of the virus with the central nervous system (CNS). The aims of the present study were to evaluate viral loads within CNS, cerebrospinal fluid (CSF), ocular fluid, and the plasma of cats in the first 23 weeks after intravenous inoculation with FIV(GL8). Proviral loads were also determined within peripheral blood mononuclear cells (PBMCs) and brain tissue. In this acute phase of infection, virus entered the brain in the majority of animals. Virus distribution was initially in a random fashion, with more diffuse brain involvement as infection progressed. Virus in the CSF was predictive of brain parenchymal infection. While the peak of virus production in blood coincided with proliferation within brain, more sustained production appeared to continue in brain tissue. In contrast, proviral loads in the brain decreased to undetectable levels in the presence of a strengthening PBMC load. A final observation in this study was that there was no direct correlation between viral loads in regions of brain or ocular tissue and the presence of histopathology.

The reification of normalcy

Many researchers who investigate the putative effects of violent television on normal children claim there is a lifetime sociopathic effect on many of the children who watch. There may be. But there is a prevailing assumption that because television can produce sociopathic effects in a laboratory, that it does outside the laboratory. In addition, uncritical assumptions of psychological normalcy among most viewers are so prevalent among researchers in this field that any pathological lifetime effect may be exaggerated. The incidence of psychopathology, especially among nonrandom subject samples obtained from public schools, may be higher than investigators suspect, which could lead to overestimates of pernicious effects by television on children. Because pathological children are more vulnerable to commercial television's putative sociopathic effects than are normal children, they may bias study results toward sociopathic attitudes and behaviors, thus misleading researchers into believing that television has a greater sociopathic effect on normal populations than it actually has. Those psychopathologies are reviewed and prospective remedies are suggested for helping those children cope with the possible sociopathic effects of violently oriented television.

Emotionally disturbed children's reactions to violent media segments

This study examined the reaction of children with a diagnosed disruptive behavior disorder (DBD) to violent movie scenes. Children without one of these disorders were tested as well. DBD children ranged in age from 8 to 12 years and were outpatients at The University of Kansas Medical Center's Department of Child Psychiatry. These children were diagnosed by a child psychiatrist as meeting Diagnostic and Statistical Manual of Mental Disorders (4th edition) (American Psychiatric Association 1994) (DSM-IV) diagnostic criteria for having at least one of three emotional disorders: attention-deficit hyperactivity disorder (ADHD), oppositional defiant disorder (ODD), and conduct disorder (CD). Results showed that the disordered children differed from the nondisordered children on several dimensions. This suggests that DBD children process the anti-social messages in violent movies differently from children without a psychiatric disorder. An unabated diet of antisocial media could have harmful effects on children with a psychiatric illness.