The multidimensional impact of maternal near-miss on the lives of women in Zanzibar, Tanzania: a prospective, 1-year follow-up study.

BACKGROUND: Severe maternal morbidity has been shown to have specific, long-term effects on health and wellbeing, such as daily functioning and mental health. OBJECTIVE: This study aimed to multidimensionally assess the long-term impact of maternal near-miss complications in Zanzibar. STUDY DESIGN: A prospective cohort study was conducted in Zanzibar's referral hospital. Women with maternal near-miss complications were matched with controls. At 3, 6, and 12 months after hospital discharge, history was taken, blood pressure and haemoglobin levels were measured, and multiple validated questionnaires (WHOQOL-BREF, WHODAS2.0, Patient Health Questionnaire-9, Harvard Trauma Questionnaire-16) were administered assessing experienced quality of life and disability, and screening for depression and posttraumatic stress disorder. RESULTS: We included 223 women after maternal near-miss complications and 213 women controls. There was a high prevalence of hypertension at 6 and 12 months in both groups and significantly higher after a near-miss. The proportion of women with low quality of life, disability, depression, or posttraumatic stress disorder was not significantly different between the 2 groups. A poor outcome for at least 1 of these 3 health domains was more prevalent after a near-miss complication. CONCLUSION: In Zanzibar, women after maternal near-miss complications report similar but slower recovery to control participants in the assessed dimensions. Adaptation of perceptions on and coping mechanisms with daily reality might partly explain this. Hypertension has a high prevalence after childbirth and should be treated adequately to prevent recurrent obstetrical and cardiovascular complications. Blood pressure follow-up for all women who delivered at Mnazi Mmoja Hospital seemed justified.

Maternal perception of fetal movements: Views, knowledge and practices of women and health providers in a low-resource setting.

The study assessed perception, knowledge, and practices regarding maternal perception of fetal movements (FMs) among women and their healthcare providers in a low-resource setting. Semi-structured interviews, questionnaires and focus group discussions were conducted with 45 Zanzibar women (18 antenatal, 28 postpartum) and 28 health providers at the maternity unit of Mnazi Mmoja Hospital, Zanzibar, Tanzania. Descriptive and thematic analyses were conducted to systematically extract subthemes within four main themes 1) knowledge/awareness, 2) behavior/practice, 3) barriers, and 4) ways to improve practice. Within the main themes it was found that 1) Women were instinctively aware of (ab)normal FM-patterns and healthcare providers had adequate knowledge about FMs. 2) Women often did not know how to monitor FMs or when to report concerns. There was inadequate assessment and management of (ab)normal FMs. 3) Barriers included the fact that women did not feel free to express concerns. Healthcare providers considered FM-awareness among women as low and unreliable. There was lack of staff, time and space for FM-education, and no protocol for FM-management. 4) Women and health providers recognised the need for education on assessment and management of (ab)normal FMs. In conclusion, women demonstrated adequate understanding of FMs and perceived abnormalities of these movements better than assumed by health providers. There is a need for more evidence on the effect of improving knowledge and awareness of FMs to construct evidence-based guidelines for low resource settings.

Too busy to care? Analysing the impact of system-related factors on maternal mortality in Zanzibar's Referral Hospital.

This study analyses the contribution of system-related factors to maternal mortality in the low-resource setting of Mnazi Mmoja Hospital in Zanzibar, Tanzania. It is a retrospective cohort study including all maternal deaths (MD, n = 139) and maternal near-misses (MNM, n = 122) in Mnazi Mmoja Hospital with sufficient documentation during 2015 to 2018 (MD) and 2017 to 2018 (MNM). The number of admissions and surgical interventions per health care provider on the day of admission and the number of times vital signs were monitored per day were compared between MNM and MD cases using logistic regression. The mean number of times vital signs were monitored per day was associated with reduced odds of mortality (aOR 0.75, 95% CI 0.64-0.89), after adjustment for confounding factors such as severity of illness. The numbers of admissions or surgical procedures per health care provider were not associated with mortality. Concluding, the degree of monitoring of patients with life-threatening complications of pregnancy or childbirth is associated with the risk of mortality independent of the degree of severity. Preventing maternal mortality requires going beyond availability of essential interventions to tackle system-related factors that have a direct impact on the capacity to provide comprehensive care.Impact StatementWhat is already known on this subject? Root cause analyses of maternal deaths have identified many system-related factors, such as availability of health care providers, adequate training, and motivation to sustain high intensity monitoring (Madzimbamuto et al. 2014; Mahmood et al. 2018).What do the results of this study add? This is the first study to attempt to quantify the contribution of these system-related factors by comparing cases of maternal death with cases of maternal near-miss. We show that the degree of monitoring of patients with life-threatening complications is associated with the odds of mortality independent of the degree of severity. Even though this relation should not be regarded as causative, monitoring of vital signs can be seen as reflective of many system-related factors which hamper or facilitate comprehensive care.What are the implications of these findings for clinical practice and/or further research? This study helps increase general understanding of the factors leading to progression from severe disease to death in a high-volume low-income setting.

Scaling up context-tailored clinical guidelines and training to improve childbirth care in urban, low-resource maternity units in Tanzania: A protocol for a stepped-wedged cluster randomized trial with embedded qualitative and economic analyses (The PartoMa Scale-Up Study).

While facility births are increasing in many low-resource settings, quality of care often does not follow suit; maternal and perinatal mortality and morbidity remain unacceptably high. Therefore, realistic, context-tailored clinical support is crucially needed to assist birth attendants in resource-constrained realities to provide best possible evidence-based and respectful care. Our pilot study in Zanzibar suggested that co-created clinical practice guidelines (CPGs) and low-dose, high-frequency training (PartoMa intervention) were associated with improved childbirth care and survival. We now aim to modify, implement, and evaluate this multi-faceted intervention in five high-volume, urban maternity units in Dar es Salaam, Tanzania (approximately 60,000 births annually). This PartoMa Scale-up Study will include four main steps: I. Mixed-methods situational analysis exploring factors affecting care; II. Co-created contextual modifications to the pilot CPGs and training, based on step I; III. Implementation and evaluation of the modified intervention; IV. Development of a framework for co-creation of context-specific CPGs and training, of relevance in comparable fields. The implementation and evaluation design is a theory-based, stepped-wedged cluster-randomised trial with embedded qualitative and economic assessments. Women in active labour and their offspring will be followed until discharge to assess provided and experienced care, intra-hospital perinatal deaths, Apgar scores, and caesarean sections that could potentially be avoided. Birth attendants' perceptions, intervention use and possible associated learning will be analysed. Moreover, as further detailed in the accompanying article, a qualitative in-depth investigation will explore behavioural, biomedical, and structural elements that might interact with non-linear and multiplying effects to shape health providers' clinical practices. Finally, the incremental cost-effectiveness of co-creating and implementing the PartoMa intervention is calculated. Such real-world scale-up of context-tailored CPGs and training within an existing health system may enable a comprehensive understanding of how impact is achieved or not, and how it may be translated between contexts and sustained.Trial registration number: NCT04685668.

Development of a clinical prediction model for perinatal deaths in low resource settings.

BACKGROUND: Most pregnancy-related deaths in low and middle income countries occur around the time of birth and are avoidable with timely care. This study aimed to develop a prognostic model to identify women at risk of intrapartum-related perinatal deaths in low-resourced settings, by (1) external validation of an existing prediction model, and subsequently (2) development of a novel model. METHODS: A prospective cohort study was conducted among pregnant women who presented consecutively for delivery at the maternity unit of Zanzibar's tertiary hospital, Mnazi Mmoja Hospital, the Republic of Tanzania between October 2017 and May 2018. Candidate predictors of perinatal deaths included maternal and foetal characteristics obtained from routine history and physical examination at the time of admission to the labour ward. The outcomes were intrapartum stillbirths and neonatal death before hospital discharge. An existing stillbirth prediction model with six predictors from Nigeria was applied to the Zanzibar cohort to assess its discrimination and calibration performance. Subsequently, a new prediction model was developed using multivariable logistic regression. Model performance was evaluated through internal validation and corrected for overfitting using bootstrapping methods. FINDINGS: 5747 mother-baby pairs were analysed. The existing model showed poor discrimination performance (c-statistic 0·57). The new model included 15 clinical predictors and showed promising discriminative and calibration performance after internal validation (optimism adjusted c-statistic of 0·78, optimism adjusted calibration slope =0·94). INTERPRETATION: The new model consisted of predictors easily obtained through history-taking and physical examination at the time of admission to the labour ward. It had good performance in predicting risk of perinatal death in women admitted in labour wards. Therefore, it has the potential to assist skilled birth attendance to triage women for appropriate management during labour. Before routine implementation, external validation and usefulness should be determined in future studies. FUNDING: The study received funding from Laerdal Foundation, Otto Kranendonk Fund and UMC Global Health Fellowship. TD acknowledges financial support from the Netherlands Organisation for Health Research and Development (grant 91617050).

Understanding women's decision-making process for birth location in Tanzania based on individual women's reproductive pathways: a life-course perspective.

BACKGROUND: Determinants for women's care seeking for birth in low-income setting are multifactorial and remain poorly understood. A life course approach can assist to structure the interplay of the different factors that lead to women seeking care or not. OBJECTIVE: In this study we aimed to explore individual women's reproductive pathways, and increase understanding of how important life events including previous pregnancy and birth experiences can help us to understand individual choices made for care seeking during childbirth. METHODS: The study took place in Tanzania between 2015 and 2017. 14 women were followed throughout their pregnancy, birth and postpartum period through participant observation and in-depth interviews. In total 94 in-depth interviews were held (between 5-7 interviews per woman). Analysis occurred continuous throughout the data collection period resulting in detailed narratives of crucial events across women's life course, with specific attention to their current pregnancy. RESULTS: Of the 14 women, seven had a facility birth, six a home birth and one woman gave birth at the home of a local birth attendant. Four different story plots were identified: expected home birth, expected facility birth, unexpected facility birth and unexpected home birth. Birth narratives of four women representative of the different story plots are presented. Narratives illustrate women's individual reproductive pathways including the various factors influencing women's expectations and justifications for their actions during their pregnancy and birth. CONCLUSION: Women's agency, including women's perception of self, the self in relation to the social environment and reflection on risks associated with the range of options, influences the final decision made for birth. Women's narratives suggest that quality of care can function as a primary pull factor for facility birth. As long as home birth is by some perceived to be a better alternative, achieving skilled care for all will be difficult to achieve.

2030 Countdown to combating malnutrition in Burundi: comparison of proactive approaches for case detection and enrolment into treatment.

BACKGROUND: Burundi has one of the highest rates of malnutrition in the world, particularly chronic malnutrition, which affects 55% of all children <5 y of age. Although it rolled out a national treatment programme to combat all forms of malnutrition, enrolment of children remains difficult. In this study, we use observational data from two screening approaches to assess the effectiveness in detection and enrolment into treatment. METHODS: Individual data from each screening approach was classified as either acutely malnourished or normal and either chronically malnourished or normal using a cut-off z-score between -2 and 2. RESULTS: While the Global Acute Malnutrition rate for the community-based mass screening was 8.3% (95% CI 5.6 to 11), with 8% enrolled in treatment, that of clinic-based systematic screening was 14.1% (95% CI 12.2 to 16.1), 98% of which were enrolled in treatment. Clinic systematic screening was 1.82 times (OR, 95% CI 1.26 to 2.62, p<0.001) and 1.35 times (95% CI 1.09 to 1.68, p=0.06) more likely to detect acute and chronic malnutrition, respectively, than community-based mass screening. CONCLUSIONS: Although different mechanisms are relevant to proactively detect cases, strengthening the health system to systematically screen children could yield the best results, as it remains the primary contact for the sicker population, who may be at risk of increased infection as a result of underlying malnutrition.

The injustice of unfit clinical practice guidelines in low-resource realities.

To end the international crisis of preventable deaths in low-income and middle-income countries, evidence-informed and cost-efficient health care is urgently needed, and contextualised clinical practice guidelines are pivotal. However, as exposed by indirect consequences of poorly adapted COVID-19 guidelines, fundamental gaps continue to be reported between international recommendations and realistic best practice. To address this long-standing injustice of leaving health providers without useful guidance, we draw on examples from maternal health and the COVID-19 pandemic. We propose a framework for how global guideline developers can more effectively stratify recommendations for low-resource settings and account for predictable contextual barriers of implementation (eg, human resources) as well as gains and losses (eg, cost-efficiency). Such development of more realistic clinical practice guidelines at the global level will pave the way for simpler and achievable adaptation at local levels. We also urge the development and adaptation of high-quality clinical practice guidelines at national and subnational levels in low-income and middle-income countries through co-creation with end-users, and we encourage global sharing of these experiences.

Journey to facility birth in Zanzibar: a questionnaire-based cohort study of patients' perspectives on preparedness, access and quality of care.

INTRODUCTION: Tackling substandard maternity care in health facilities requires engaging women's perspectives in strategies to improve outcomes. This study aims to provide insights in the perspectives of women with severe maternal morbidity on preparedness, access and quality of care in Zanzibar's referral hospital. METHODS: In a prospective cohort from April 2017 to December 2018, we performed semistructured interviews with women who experienced maternal near-miss complications and matched controls. These focused on sociodemographic and obstetric characteristics, perceived accessibility to and quality of facility care with 15 domains, scored on a one-to-five scale. Participants' comments and answers to open questions were employed to illustrate quantitative outcomes. Zanzibar's Medical Research and Ethics Committee approved the study (ZAMREC/0002/JUN/17). RESULTS: We included 174 cases and 151 controls. Compared with controls, patients with a near-miss had less formal education (p=0.049), perceived their wealth as poor (p=0.002) and had a stillbirth more often (p<0.001). Many experienced a delay in deciding to seek care. More than controls, near-miss patients experienced barriers in reaching care (p=0.049), often of financial nature (13.8% vs 4.0%). Quality of care was perceived as high, with means above 3 out of 5, in 14 out of 15 domains. One-fifth had an overall suboptimal experience, mostly regarding informed choice and supplies availability. Additional comments were expressed by a minority of participants. CONCLUSION: Most patients promptly sought, accessed and received maternity care in Zanzibar's referral hospital. A minority experienced barriers, mostly financial, in reaching care and more so among patients with near-miss complications. Quality of facility care was generally highly rated. However, some reported insightful critical perceptions. This study highlights the impact of sociodemographic differences on health, the value of involving patients in decisions regarding maternity care and the need to ensure availability of medical supplies, all which will contribute to improved maternal well-being.

The application of WHO ICD-PM: Feasibility for the classification of timing and causes of perinatal deaths in a busy birth centre in a low-income country.

OBJECTIVE: To assess the feasibility of the application of International Classification of Diseases-10-to perinatal mortality (ICD-PM) in a busy low-income referral hospital and determine the timing and causes of perinatal deaths, and associated maternal conditions. DESIGN: Prospective application of ICD-PM. SETTING: Referral hospital of Mnazi Mmoja Hospital, Zanzibar, United Republic of Tanzania. POPULATION: Stillbirths and neonatal deaths with a birth weight above 1000 grams born between October 16th 2017 to May 31st 2018. METHODS: Clinical information and an adapted WHO ICD-PM interactive excel-based system were used to capture and classify the deaths according to timing, causes and associated maternal complications. Descriptive analysis was performed. MAIN OUTCOME MEASURES: Timing and causes of perinatal mortality and their associated maternal conditions. RESULTS: There were 661 perinatal deaths of which 248 (37.5%) were neonatal deaths and 413 (62.5%) stillbirths. Of the stillbirths, 128 (31%) occurred antepartum, 129 (31%) intrapartum and for 156 (38%) the timing was unknown. Half (n = 64/128) of the antepartum stillbirths were unexplained. Two-thirds (67%, n = 87/129) of intrapartum stillbirths followed acute intrapartum events, and 30% (39/129) were unexplained. Of the neonatal deaths, 40% died after complications of intrapartum events. CONCLUSION: Problems of documentation, lack of perinatal death audits, capacity for investigations, and guidelines for the unambiguous objective assignment of timing and primary causes of death are major threats for accurate determination of timing and specific primary causes of perinatal deaths.

Symphysis-fundal height, gestational age and its value for identification of foetuses at risk in rural Tanzania: A qualitative follow-up study.

Preterm birth and abnormal foetal growth increase the risk of perinatal morbidity and mortality. Timely identification of foetuses at risk is critical to improving maternal and neonatal outcomes. The objective of this study was to increase understanding of the quality of foetal growth monitoring during antenatal care in Tanzania. Between 2015 and 2017, 13 women were followed throughout their pregnancy, childbirth and postpartum period. Participants were recruited using a staggered approach at selected health facilities. Data collection included direct observations of 25 of 48 antenatal care consultations, review of the women's antenatal cards, 88 in-depth interviews and participant observation at the health facilities. Six women had facility births and seven had home births. There was one stillbirth, one preterm birth and two term infants died between the age of 3-6 months. Of the 9 newborns with a known birthweight, 3 were possibly growth-restricted. During 12 ANC visits (25%) Symphysis-Fundal Height (SFH) was not recorded and during 22 visits (46%) the recorded Gestational Age (GA) was incorrect. Despite regular assessment of SFH, three possible growth-restricted infants remained undetected. There is a need to improve nurse-midwives ability to determine a reliable GA and improve critical reflection on SFH measurement.

Economic Evaluation of Screening Interventions for Drug-induced Liver Injury.

BACKGROUND: Human immunodeficiency virus (HIV)/AIDS and tuberculosis (TB) continue to be a significant global burden, disproportionately affecting low- and middle-income countries (LMICs). While much progress has been made in treating these epidemics, this has led to a rise in liver complications, as patients on ARTs and anti-TBs are at an increased risk of drug-induced liver injury (DILI). Therefore, patients on these medicines require consistent screening of liver function. Due to logistical barriers, gold standard DILI screening fails to be executed at the point-of-care in LMICs. For this reason, we used cost-effectiveness analysis to gauge the efficacy of a paper-test that could be implemented in these settings. METHODS: We used a Markov Model to simulate HIV and TB coinfected patient care in LMICs using both publicly available data and data from Village Health Works in Burundi. We compared the cost-effectiveness of two screening interventions for liver function monitoring: 1. paper-based point-of-care testing, and 2. gold-standard laboratory testing. These interventions were compared against baseline clinical monitoring. RESULTS: The paper test showed a 56% increase in efficacy over clinical monitoring alone. The paper-test is more cost-effective than the gold-standard method, at a ceiling cost of $1.60 per test. CONCLUSIONS: With this information, policy makers can be informed as to the large potential value of paper-based tests when gold standard monitoring is not achievable. Scientists and engineers should also keep these analyses in mind and while in development limit the cost of an ALT screening test to $1.60.

Retrospective validation study of miniPIERS prediction model in Zanzibar.

OBJECTIVE: To perform a retrospective external validation of miniPIERS in Zanzibar's referral hospital. METHODS: From February to December 2017, data were collected retrospectively on all cases of hypertensive disorders of pregnancy (HDP) admitted to Mnazi Mmoja Hospital, Zanzibar, Tanzania. The primary outcome was the predictive performance of miniPIERS by examining measures of discrimination, calibration, and stratification accuracy. The secondary outcome was the applicability of miniPIERS within the referral hospital setting. RESULTS: During this period, 2218 of 13 395 (21%) patients were identified with HDP, of whom 594 met the inclusion criteria. Sixty per cent of patients with adverse outcomes were excluded because they had experienced one of the adverse outcomes before admission. The discriminative ability of miniPIERS was inaccurate. It was not likely to aid risk stratification because of low sensitivity and low positive predictive value. The model showed fair discrimination in HDP before 34 weeks of gestation (area under the receiver operating characteristics curve 0.72, 95% confidence interval 0.63-0.82). CONCLUSIONS: The benefit of miniPIERS appeared to be limited, although clinical conditions make any validation challenging. Its application for risk stratification in preterm pregnancies should be further investigated.

"I lost my happiness, I felt half dead and half alive" - a qualitative study of the long-term aftermath of obstetric near-miss in the urban district of Zanzibar, Tanzania.

BACKGROUND: This study aims to explore the stories of three women from Zanzibar, Tanzania, who survived life-threatening obstetric complications. Their narratives will increase understanding of the individual and community-level burden masked behind the statistics of maternal morbidity and mortality in Tanzania. In line with a recent systematic review of women-centred, qualitative maternal morbidity research, this study will contribute to guidance of local and global maternal health agendas. METHODS: This two-phased qualitative study was conducted in July-August 2017 and July-August 2018, and involved three key informants, who were recruited from a maternal near-miss cohort in May 2017 in Mnazi Mmoja Hospital, Zanzibar. The used methods were participant observation, interviews (informal, unstructured and semi-structured), participatory methods and focus group discussions. Data analysis relied primarily on grounded theory, leading to a theoretical model, which was validated repeatedly by the informants and within the study team. The findings were then positioned in the existing literature. Approval was granted by Zanzibar's Medical Ethical Research Committee (reference number: ZAMREC/0002/JUN/17). RESULTS: The impact of severe maternal morbidity was found to be multi-dimensional and to extend beyond hospital discharge and thus institutionalized care. Four key areas impacted by maternal morbidities emerged, namely (1) social, (2) sexual and reproductive, (3) psychological, and (4) economic well-being. CONCLUSIONS: This study showed how three women's lives and livelihoods were profoundly impacted by the severe obstetric complications they had survived, even up to 16 months later. These impacts took a toll on their physical, social, economic, sexual and psychological well-being, and affected family and community members alike. These findings advocate for a holistic, dignified, patient value-based approach to the necessary improvement of maternal health care in low-income settings. Furthermore, it emphasizes the need for strategies to be directed not only towards quality of care during pregnancy and delivery, but also towards support after obstetric complications.

Quality of intrapartum care: direct observations in a low-resource tertiary hospital.

BACKGROUND: The majority of the world's perinatal deaths occur in low- and middle-income countries. A substantial proportion occurs intrapartum and is avoidable with better care. At a low-resource tertiary hospital, this study assessed the quality of intrapartum care and adherence to locally-tailored clinical guidelines. METHODS: A non-participatory, structured, direct observation study was held at Mnazi Mmoja Hospital, Zanzibar, Tanzania, between October and November 2016. Women in active labour were followed and structure, processes of labour care and outcomes of care systematically recorded. Descriptive analyses were performed on the labour observations and compared to local guidelines and supplemented by qualitative findings. A Poisson regression analysis assessed factors affecting foetal heart rate monitoring (FHRM) guidelines adherence. RESULTS: 161 labouring women were observed. The nurse/midwife-to-labouring-women ratio of 1:4, resulted in doctors providing a significant part of intrapartum monitoring. Care during labour and two-thirds of deliveries was provided in a one-room labour ward with shared beds. Screening for privacy and communication of examination findings were done in 50 and 34%, respectively. For the majority, there was delayed recognition of labour progress and insufficient support in second stage of labour. While FHRM was generally performed suboptimally with a median interval of 105 (interquartile range 57-160) minutes, occurrence of an intrapartum risk event (non-reassuring FHR, oxytocin use or poor progress) increased assessment frequency significantly (rate ratio 1.32 (CI 1.09-1.58)). CONCLUSIONS: Neither international nor locally-adapted standards of intrapartum routine care were optimally achieved. This was most likely due to a grossly inadequate capacity of birth attendants; without whom innovative interventions at birth are unlikely to succeed. This calls for international and local stakeholders to address the root causes of unsafe intrafacility care in low-resource settings, including the number of skilled birth attendants required for safe and respectful births.

Local adaption of intrapartum clinical guidelines, United Republic of Tanzania.

PROBLEM: Gaps exist between internationally derived clinical guidelines on care at the time of birth and realistic best practices in busy, low-resourced maternity units. APPROACH: In 2014-2018, we carried out the PartoMa study at Zanzibar's tertiary hospital, United Republic of Tanzania. Working with local birth attendants and external experts, we created easy-to-use and locally achievable clinical guidelines and associated in-house training to assist birth attendants in intrapartum care. LOCAL SETTING: Around 11 500 women gave birth annually in the hospital. Of the 35-40 birth attendants employed, each cared simultaneously for 3-6 women in labour. At baseline (1 October 2014 to 31 January 2015), there were 59 stillbirths per 1000 total births and 52 newborns with an Apgar score of 1-5 per 1000 live births. Externally derived clinical guidelines were available, but rarely used. RELEVANT CHANGES: Staff attendance at the repeated trainings was good, despite seminars being outside working hours and without additional remuneration. Many birth attendants appreciated the intervention and were motivated to improve care. Improvements were found in knowledge, partograph skills and quality of care. After 12 intervention months, stillbirths had decreased 34% to 39 per 1000 total births, while newborns with an Apgar score of 1-5 halved to 28 per 1000 live births. LESSONS LEARNT: After 4 years, birth attendants still express high demand for the intervention. The development of international, regional and national clinical guidelines targeted at low-resource maternity units needs to be better attuned to input from end-users and the local conditions, and thereby easier to use effectively.