New Pages on the blog

Posted on 4 June 2016 by Keith Barrington

I am in the process of re-organizing the “Important Neonatal Publications” page, into a number of sub-pages with topics. It was getting a bit long and hard to find anything you are particularly interested in. I will be adding more sub-pages as I get a chance over the next few weeks. The original idea was for this to be a reading list for our fellows, to give a good grounding in evidence based neonatology. I hope others find it useful. If you hover over the “Important Neonatal Publications” item in the menu above you will see a list of topics.

Also new pages of bird photographs, one from the UK, another from Florida. The pictures from the UK with the Coot family including the still-bald babies I quite like.

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Seizures are bad for you

Posted on 4 June 2016 by Keith Barrington

Fox CK, et al. Neonatal seizures triple the risk of a remote seizure after perinatal ischemic stroke. Neurology. 2016. This analysis of a Kaiser Permanente database had 87 children with perinatal strokes. Those who had seizures during the neonatal period had far higher risk of later epilepsy, including refractory epilepsy requiring multiple medications.  Of the whole sample more than half had at least one seizure in later life, and half of those had refractory epilepsy. The risk of both was about twice as high if you had neonatal seizures.

Hart AR, et al. Neonatal seizures—part 1: Not everything that jerks, stiffens and shakes is a fit. Archives of disease in childhood – Education & practice edition. 2015;100(4):170-5. As this review article notes, diagnosing seizures is difficult. Previous evidence has shown that about half of what we think are “fits” (in the good old English terminology) are not, and we only recognize about half of actual seizures as diagnosed by routine clinical monitoring. Some studies show we are even worse than that.

Glass HC, et al. Contemporary Profile of Seizures in Neonates: A Prospective Cohort Study. The Journal of pediatrics. 2016. This was a prospective multi-center cohort study, with newborns who were considered at risk for convulsions all being monitored by continuous video EEG. Most of the 426 included babies had HIE, or strokes, or intracranial hemorrhages. Many of the babies had large numbers of seizures and 16% had status epilepticus. Half of the survivors still had abnormal clinical signs at discharge, with another 17% dying. Those that had the most seizures were more likely to die or be abnormal at discharge.

Continuous video-EEG is clearly now an essential tool in any tertiary NICU, and we need to find ways to recognize the seizures faster, and treat them more effectively.

 

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Give poor pregnant women cash

Posted on 1 June 2016 by Keith Barrington

Tommy Douglas was a former professional boxer, who was also a Baptist minister, and is the father of Canadian Medicare. He was from the Canadian Prairies, has been referred to as the ‘greatest Canadian of all time’ and worked tirelessly to start a Canadian Health Care system which provides care to all, regardless of ability to pay.

Prenatal care is supplied to everyone, in every province, and leads to us having perinatal outcomes which are excellent. There are still disparities, however, and poor women have a number of outcomes which are worse than women with more resources.

Our system (actually systems, there are significant differences between the provinces, that are responsible for administering health care) is far from perfect, acute and emergency care tends to be favoured, so neonatal care, for example, is in a privileged position. Central management makes regionalization quite effective, so we have almost no avoidable deliveries of very preterm babies in non-tertiary hospitals. But central management also creates problems, with, for example, the size of medical school intakes oscillating as the government tries to decide if we have too many physicians or too few, and keeps changing its mind.

Chronic care, and domiciliary care are the big losers in our system, as it is politically easier to cut budgets when the adverse effects are slowly cumulative rather than acutely visible. Non-urgent surgery is another place where our system does poorly, so a hip replacement might be quite delayed, with consequent avoidable pain and disability. One interesting comparison with the US system was made a few years ago by John Ralston Saul. The cost of US Medicare divided by the entire US population, (even though it only covers a small part of the US population) was greater than the cost  of Canadian Medicare, divided by the entire Canadian Population, but the Canadian system covers everybody.

In Manitoba (one of the Canadian Provinces, total population just over a million) they introduced a program in 2001 where any pregnant woman with an annual income under $32000 was eligible to receive an income supplement, as long as she applied for it, the income supplement was up to $81.41 a month,and was accompanied by written information about prenatal care, breastfeeding, etc.

In this new study the authors examined the outcomes of the nearly 11,000 pregnancies where the woman claimed and received the supplement, to those of eligible women who did not (nearly 4,000). After matching for propensity scores, those who got the extra cash had less low birth weight, less small for gestational age, more breast-feeding initiation, and more large for gestational age babies.

The average annual income of the mothers who received the supplement was less than $10,000, so the supplement, which doesn’t sound like much to a Canadian doctor like me, was actually a nearly 10% increase in their monthly income.

The authors of this remarkable work contrast their results with those of other countries (mostly in Latin America) who have introduced income supplements, but only for mothers who attend antenatal care, or who satisfy other conditions.

They note that when the program was introduced in Manitoba there were questions:

As a society, we tend to assume that poor people cannot be trusted to make good choices. Indeed, when HBPB (the income supplement program) was first introduced in Manitoba, concerns were expressed about introducing a program for low-income women without conditions or accountability.  Although information about prenatal and infant health is included with the monthly payment, the Manitoba HBPB program trusts low-income women to make good choices regarding their pregnancies.

For a small cost, just giving poor pregnant women a small amount of money every month during their second and third trimesters, improves pregnancy outcomes. There was also a decrease in length of stay after delivery, so it probably saved money as well.

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Outcomes of babies with surgical anomalies

Posted on 1 June 2016 by Keith Barrington

Neonatologists basically invented the field of outcomes research; many of my colleagues from around the world have closely examined the outcomes of very premature and extremely premature infants for many years: well before people in other fields were doing so. Outcome research for other babies that we look after has been more recently performed; here are a few recent studies about surgical congenital anomalies.

Bojanic K, et al. Cardiopulmonary exercise performance is reduced in congenital diaphragmatic hernia survivors. Pediatr Pulmonol. 2016. In this study performed at 5 to 20 years of age, among 27 the survivors of CDH repair, reduced exercise tolerance and other respiratory symptoms were present in about half. VO2 max was much lower but equally variable (which means in relative terms, more variable) than a control group. The results are not too surprising for a condition which is nearly universally lethal without intervention, but the implication is that testing like this could lead to an intervention (that is, exercise training) that might improve outcomes in some individuals. Of course, exercise is good for everyone who can do it. I wonder if it is possible that part of the effect is due to over-protection of children with “weak lungs” and whether one intervention should be just to re-assure parents that exercise is good, and getting tired after exercise is normal.

Calzolari F, et al. Outcome of infants operated on for congenital pulmonary malformations. Pediatr Pulmonol. 2016. In this study the authors looked at outcomes of children who had had congenital cystic adenomatoid malformations (apparently they are now called congenital pulmonary airway malformations CPAM; but it seems a bit redundant to put pulmonary and airway in the same acronym) or sequestrations (which they call broncho-pulmonary sequestrations BPS) or congenital lobar emphysema (which they now call congenital alveolar overdistension CAO). These patients biggest problem in follow up is that nobody knows what problem they had because the acronyms have all changed! There is a lot of uncertainty about what to do with children who have these lesions but who do not have symptoms. Apparently, in the Ospedale Bambino Gésu (I just wanted to type that mellifluous name) in Rome, they operate on all diagnosed cases, which may or may not be the right thing to do, or at least that is what they say in the methods, in the results, they note that there were 8 non-operated infants, who were excluded from the study. They finished with 68 patients aged 4 to 9 years, and compared them to a group of kids who had inguinal hernia surgery. 40% of the patients and 12% of controls had recurrent wheezing, and needed inhaled bronchodilators. There were only 5 patients with congenital lobar emphysema, but they all had recurrent wheeze, the other 2 groups were similar to each other. Many of the patients (20%) had had respiratory tract infections, and none of the controls. The patients who had a lobectomy were more at risk, and babies who needed post-operative assisted ventilation. As they got older the symptoms improved.

Roberts K, et al. Outcomes of oesophageal atresia and tracheo-oesophageal fistula repair. J Paediatr Child Health. 2016. A review article examining the long-term impacts of the conditions in the title. The long-term function of the oesophagus is impaired, with frequent reflux and prolonged, even life-long dysphagia. 50% to 90% of adolescents and adults have at least occasional dysphagia, with many avoiding certain foods, and up to 20% have daily symptoms. Recurrent wheeze is common, many have restrictive defects on lung function testing, but most adults have normal exercise tolerance. Developmental testing has been less frequent, but there do seem to be developmental delays, especially in the language scores of the Bayley scales, version 2, the delays seem to be greater among infants with malnutrition during infancy, underweight being common in the first year, usually improving afterward. Quality of life scores overall are similar to the general population, but Health related quality of life is reduced, mostly because of dysphagia and reflux. A very complete, and clearly written review.

Giudici L, et al. Babies born with gastroschisis and followed up to the age of six years faced long-term morbidity and impairments. Acta Paediatr. 2016;105(6):e275-80. This study from Buenos Aires followed 54 survivors of gastroschisis at 1 year, 34 at 3 years and 117 at 6 years. I don’t recognize the tests that were used to evaluate neurological and developmental progress, but there were frequent delays, with only 64 babies in the normal range at 1 year, 50% at 3 years and 35% at 6 years. Language delays were frequent, but that tended to improve with time, and intervention. 20% of the infants had growth below the 10th percentile, throughout the study.

Sterken C, et al. Neurocognitive Development After Pediatric Heart Surgery. Pediatrics. 2016;137(6). This study followed 107 infants who had cardiac surgery in early life, they were eligible for the study if they surgery at less than a year of age, many were newborns, and the median age of having surgery was 2 months. They then tested 100 of the children again 3 years later, as well as most of the controls. The heart surgery patients had IQ scores that were about 12 points lower than controls at 4 years of age, and 7 points lower at 7 years of age. They also had deficits in visuo-motor integration, alertness, motor coordination, and psychosocial functioning, and these deficits also stayed stable.

Now that we are getting much better information about the long-term problems that these children may have. We need to do the next thing, and study how to help them improve. Whether or not the same strategies will be effective for children in each of these diagnostic groups is uncertain.

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Do Moderately Preterm Infants need RSV Immunization? What use are numbers without a denominator?

Posted on 30 May 2016 by Keith Barrington

Palivizumab is an enormously expensive medication, an antibody which is given intramuscularly about once per month to at-risk infants to prevent infection with the respiratory syncytial virus (RSV). Recently the AAP and the CPS have changed their recommendations to reduce the number of preterm babies who are eligible for it. Most babies who are slightly or moderately preterm will no longer be eligible for prophylaxis, the decision being largely because the benefits of RSV prophylaxis are not matched by the huge costs.

It is clear that palivizumab decreases both the incidence and severity of RSV infections. So its use is really only a question of cost-benefit. Costs being the monetary cost of the medication, and in addition the “cost” of a monthly intramuscular injection and its administration. If it were not for these costs then you could give palivizumab to everyone. It is to the financial benefit of the medication’s producers to emphasize the benefits of prophylaxis, while not talking about the costs, and not even trying to figure out the incidence of the problems that they are aiming to prevent.

The last sentence of this new paper you could write about absolutely any group of newborns:

Preventing severe RSV disease in this population would provide substantial health benefits, particularly during the first months of life when RSV disease incidence and severity are highest.

It may be no surprise to discover that this paper (paid for open access (by AstraZeneca), unlike most publications in this journal) was funded by AstraZeneca, who are the current producers of palivizumab; it was written by a medical writing company paid by AstraZeneca, has a corresponding author who works for AstraZeneca, and has multiple authors who have other links with AstraZeneca.

What this paper tells us is that some infants who did not get prophylaxis will catch RSV (we don’t know from this paper if that is more than babies who did get prophylaxis) some of them get very sick (we don’t know from this paper if that is more than babies who did get prophylaxis) and it costs a lot of money (we don’t know from this paper if that is more than babies who did get prophylaxis).

The paper gives no indication of how many potentially affected babies were involved, there is no denominator.

There were 702 babies with confirmed RSV disease which was community acquired. For some reason, which is not clear to me from this publication, they only give good information for 219 babies who were “enrolled”. I have read this paper a couple of times (only for the purposes of this blog; otherwise it would have quickly ended up in the metaphorical garbage can: the things I do for my gentle readers…) and I can’t figure out who was enrolled and why, compared to the non-enrolled babies, so we don’t know if the third who were enrolled were representative of the entire cohort.

The information we really need in order to decide who should get palivizumab is the following: how much does it cost if we give 10,000 34 (or 33 or 35) week gestation babies palivizumab prophylaxis, and how much does it cost if we don’t.

Studies designed, paid for, performed, written, and published, by the people who manufacture palivizumab are not likely to help us very much.

But even better would be studies that show how, now that all the R&D costs of the development of palivizumab have been recouped many times over, we can ensure that the price of palivizumab is reduced to reflect “production costs with a reasonable profit margin”; rather than “as much as we can possibly get away with”.

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Making Good Decisions: part 3. Living with the aftermath

Posted on 30 May 2016 by Keith Barrington

When there are decisions made about withholding or withdrawing life-sustaining interventions for a baby. There are 2 possible long term outcomes, either the baby will be there a few weeks hence, or not.

What do we know about how parents adjust to losing a baby after a decision to withhold or withdraw life-sustaining interventions, or how they adjust to having a baby who survives, but with impairments, or adjust to having had a critically ill baby who is now doing well?

I mentioned this publication a while ago in a Neonatal Updates post, but it fits in with this series of posts, so I will revisit it, and try to give some more context. The question that was asked by the study was how parents whose babies had died in the NICU perceived their role in decision-making. The study was performed at least 2 years after the death of the baby, and eventually included 78 families. There were 23 parents whose baby died without and end-of-life decision, the remaining parents reported that there was a decision to withdraw or withhold active intensive care.

The parents reported 3 types of decision-making around the death, either it was mostly the doctors who decided, mostly they who decided themselves after receiving information from the doctors, or they felt it was a shred decision. Using a validated grief scoring system (the TRIG-F) these authors examined associations between patterns of death and  decision-making and parents grief scores. Grief scores were somewhat lower (less grief with lower scores) with shared decision making compared to the other 2 types of decision-making patterns and compared to when there was no decision taken. It must be said that the differences don’t seem huge, the score can range between 13 and 65, and the average scores were 39 for shared decision-making and 42 to 44 for the other situations. Apparently other studies have found long-term grief scores averaging 35 for perinatal losses, which were characterized as being intense and prolonged grief, so although the “shared-decision making” group had scores which were statistically significantly lower, all the groups were still experiencing intense grief.

Does everyone want to share in the decision? I am not sure if this has been studied in quite the same way in a neonatal ICU setting, but 87 parents of kids in the PICU were asked about the pattern of decision-making they preferred, it was not overtly a decision about withdrawal of life-sustaining interventions, but “They were asked to think of the most difficult decision they had made thus far, or could imagine having to make in the future”. About 40% of parents wanted a shared decision, about 40% wanted to make the decisions themselves, and about 20% of parents wanted either the doctor to make the decisions alone, or to make the decisions after considering the parental opinion.

I think that this means that, even though there may be somewhat less grief after a shared-decision making end-of-life decision, we should try and explore with parents how they want to proceed, and not impose a standard shared decision making style on them. That might be difficult to put into practice, but parents will sometimes ask “what would you do if it was you, doctor?” or “what do you think is best?” Even if they don’t, we can simply ask “would you like me to make a recommendation?”

There is a new policy statement from the American College of Critical Care Medicine and the ATS about this. Which says some of this, although entitled “shared decision making in the ICU” actually discusses whether patients or their surrogates actually want to share the decisions

Patient and surrogate preferences for decision making vary
significantly; therefore, clinicians should tailor the decision making process to each individual case. Although data suggest that the majority of surrogate decision makers for critically ill ICU patients prefer a “middle ground” approach, a nontrivial minority prefer either significantly greater control in decision making or cede control to clinicians (Table 2). When the surrogate clearly understands the patient’s preferences and wants greater independence in decision making, such independence in choosing from among the medically acceptable options may be appropriate. Alternatively, when the surrogate has a strong emotional or psychologic aversion to assuming decisional responsibility, a greater degree of clinician responsibility may be appropriate. Further, the decision-making process often needs to change over the course of the patient’s ICU stay…

I know Annie doesn’t like this to be called “shared decision making” (as she mentioned in a comment to a previous post in this series) but rather “personalized decision making”, and I guess she has a point; but investigating the parents preferences for how they want the decision-making to go (in the neonatal field the parents are almost always the surrogates) is an important step in making good decisions.

To get back to the part about long-term impact of the decisions that are made, what about when families live with an impaired child? What impacts does that have on the parents and on the family? I don’t know of one individual study that has addressed the impact on families, who were previously involved in end-of-life decisions, that made a decision to continue active intensive care, that had a child who was impaired. But there are other data about impacts of living with an impaired child.

In a mixed methods study, where themes were developed in a qualitative study of 15 parents, and a questionnaire was built around those results and administered to 80 parents of children with various severity of impairments, the authors found results which contrasted with :

Professional myths of family devastation, unending stress, near-universal divorce, and endless drudgery

In many domains the parents viewed the impacts of living with and raising a child with impairments to be positive. Here are some of the results: on a Likert scale the responses 4 or 5 were for agree or strongly agree, these figures are percentages of respondents.

Image3

I think it is fairly obvious that if different questions were asked you would find some negative impacts, nevertheless, parents often felt that there were many positive changes that happened to them as a result of raising a child with impairments.

Here in a parent report is great example of how NOT to do antenatal counseling. The mother had a threatened preterm delivery at 28 weeks, and, according to her account she was told, just before delivering, “the worst case scenario: brain damage, cerebral palsy, vision and hearing impairment, behavioural issues and a whole host of chronic health problems” by the neonatologist. Now, why on earth would you do that? Surely at a point where there are few decisions to be made, and in a situation of very high survival and very high chance of not having severe impairments, the focus should be on supporting the mother, informing her and her partner of what was likely to happen over the next few hours and days, and maintaining a hopeful attitude. It would be OK, I think, (but I don’t usually), if you added that sometimes there are more serious complications, and if they happen we will come back to see you again and have some more serious discussions. But any parent will know that having a seriously premature baby being admitted to an intensive care unit is not 100% of the time a walk in the park. Being hit on the head with a list of all the horrible things that probably won’t happen is not, in my view an appropriate approach, and, at least, in this mother’s case, had long term adverse effects on her expectations for her child.

This mother also notes the following:

The latest study, from McMaster University in Ontario, Canada, suggests that babies born prematurely are more likely to be unemployed and unmarried as adults, while previous reports have suggested they grow up neurotic and are likely to be less intelligent and wealthy in later life.

These studies are unhelpful, not least because they potentially stigmatise children and young adults from the moment they are born – but also because the findings are not followed up with practical support.

My daughter is 10 now, but not one of her teachers has had any knowledge on how her prematurity might have impacted on her learning.

She’s top of the class for English, but struggles with some aspects of maths. While there is a body of research to suggest this is common trait in children who were born prematurely, when I’ve mentioned it to her teachers, they’ve been very dismissive.

I tend to disagree with what some of this mother suggests, that teachers should be know about the child’s prematurity in order to tailor their educational approach. I don’t know of anything different about the educational needs of a premature baby with learning difficulties to anyone else’s needs. Teachers should indeed have the support services available to optimize the outcomes of children with learning difficulties, but this applies to all of their students.

While I can’t prove it, I’m pretty sure growing up in a stable environment, with food, shelter and plenty of love has helped my premature baby grow into a bright, happy 10-year-old (even if she sometimes needs a bit of extra help with her sums).

Actually we can prove it! The home environment is immensely important in assuring good outcomes for children, whether born very prematurely or even at term.

It’s helpful, of course, to know more about how children are affected by prematurity. But unless it’s followed up by practical support, this kind of research simply stigmatises children. I’d love to see it being used instead to give all premature children the chance to catch up with their peers.

Absolutely! As Annie and I have written frequently, there is a huge amount of research about how “messed-up” very preterm babies are, and a comparatively tiny amount of research about what to do about it.

To return again to the impacts of prematurity on the family there is a very nice review article in a recent Seminars in Fetal and Neonatal Medicine, which includes the following list of “practice points”:

Parents of VPT/VLBW children report higher levels of mental health problems, increased parenting stress and an increased negative impact on family systems compared with parents of term-born/NBW children in the early years.
These initially high levels of distress, stress and negative family impact appear to diminish over time.
Parents and families with VPT/VLBW children need early, specific  and targeted support for themselves, and to support their child’s development.
Evidence-based home and hospital early intervention programs for parents of VPT/VLBW children exist.

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Culture negative sepsis: what is it?

Posted on 27 May 2016 by Keith Barrington

One of the things that I have wondered about over the years is whether infants who appear to be infected, but who have negative cultures, might have viral infections.

A new study suggests that this is not rare. Kidszun A, et al. Viral Infections in Neonates with Suspected Late-Onset Bacterial Sepsis-A Prospective Cohort Study. American journal of perinatology. 2016. In this study all the infants who were having a sepsis work-up also had evaluation for respiratory viruses (using a nasopharyngeal aspirate for a PCR multiplex) and enteral viruses using a stool sample for PCR of various viruses including an enterovirus screen. There were 88 babies with 137 sepsis screens. None of the babies who had positive blood cultures for bacteria had positive screens for viruses. 9 of the 113 sepsis evaluations which had negative blood cultures were positive for respiratory viruses, none for enteric viruses. So in this NICU at that period about 8% of sepsis-like episodes were associated with positive viral screens, some of those episodes had an increase in CRP, some had more than 5 days of antibiotic treatment. Basically all the indicators that are used to define culture-negative sepsis were present at times.

Similar data were published from 2 US NICUs a couple of years ago Ronchi A, et al. Viral respiratory tract infections in the neonatal intensive care unit: the VIRIoN-I study. The Journal of pediatrics. 2014;165(4):690-6. A similar incidence of positive tests for respiratory viruses were found with routine PCR multiplex screening added to traditional sepsis screens, of 6% among over 130 sepsis screens. They also had no patients with a positive viral screen who also had a positive blood culture.

I think there is value in doing this, the results can be obtained rapidly, could be used to stop antibiotics faster (although that doesn’t seem to have happened in either of these studies). Spread of viruses in the NICU can be reduced by good hand hygiene measures, knowing a baby is infected might make people do a better job of washing, but I’m not too hopeful about that.

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New Publication

Posted on 26 May 2016 by Keith Barrington

Just arrived on-line: a systematic review and meta-analysis (I can imagine Annie’s eyes glazing over right now as she reads those words) of neonatal resuscitation programs. Pammi M, et al. Newborn Resuscitation Training Programmes Reduce Early Neonatal Mortality. Neonatology. 2016;110(3):210-24. Available free on-line.

I have been a PALS instructor, an NRP instructor and regional trainer, and a real believer in evidence-based resuscitation programs, paediatric and neonatal, since they were introduced (not very evidence-based at first, but that has been improving). But being a “believer” is not my style, I would rather be an advocate based on good evidence that such programs actually reduce adverse outcomes. At first there was little good evidence that neonatal resuscitation training programs did that, the evidence was mostly that people improved their skills (according to standards established by the same programs) and were more able to comply with the resuscitation algorithms that those same programs had developed.

We decided to do a systematic review of the available evidence, and found that there was adequate evidence of benefit of NRP type programs.

At the same time, another demonstration of the effectiveness of such programs (not a randomized trial this time, but a valuable publication anyways) Kc A, et al. Reducing Perinatal Mortality in Nepal Using Helping Babies Breathe. Pediatrics. 2016.

I wish I knew how to pronounce “Kc” but, nonetheless, the HBB paradigm led to dramatic improvements in intra-partum stillbirth and early neonatal death in the centers in Nepal where it was initiated.

The intrapartum stillbirth rate decreased from 9.0 to 3.2 per thousand deliveries, and first-day mortality from 5.2 to 1.9 per thousand live births.

That is an effect that ‘risks’ saving hundreds of thousands of babies each year.

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I want a Guarantee.

Posted on 26 May 2016 by Keith Barrington

Enomoto M, et al. Effect of Volume Guarantee in Preterm Infants on High-Frequency Oscillatory Ventilation: A Pilot Study. American journal of perinatology. 2016(EFirst).

One of the things that really bugs me (and there are many, as my gentle readers will know by now) is that new ventilator technology can be introduced with no actual evidence that it is safe, effective or improves outcomes. The same can be said of most medical devices (I am talking about Canada, but I think this applies in Europe also, and probably in most parts of the world), but assisted ventilation is the most invasive and potentially life-threatening intervention we perform on a daily basis; so a new trick on a ventilator holds a huge risk of creating more lung injury, and more mortality; but also potentially improving outcomes.

Shouldn’t we require phase 1 (proof of concept) trials, followed by small phase 2 trials (for efficacy), and then by large phase 3 trials, for safety and comparison with current best practice, when a ventilator manufacturer adds a new way of ventilating a critically ill baby to their machine?

When we took delivery of our Drager VN500 ventilators we found that they had a new mode of ventilation, High-frequency volume guarantee ventilation. The ventilator can be set to deliver a particular volume on high-frequency, and then will adjust the amplitude of the pressure excursions to maintain the same volume.

What a great idea!

(I am not being sarcastic, I actually do think its a great idea)

But. Shouldn’t there be some evaluation of whether it actually works in the real world, and not just in the engineers hangar? Some evidence that it actually improves stability of blood gases, without a major increase in potential markers of lung injury? And then some evidence that babies are actually better off (or at least not worse off) when using this technology compared to standard high frequency ventilation?

If someone introduced a new drug: “Lungprotecticon”: to improve pulmonary outcomes in premies we would ask for nothing less. But when we hook their lungs up directly to a machine capable of delivering enormously damaging pressures/volumes we accept that it is just a new tweak to an already evidence-poor part of neonatology.

This has to change.

Lets get back to the article at the top of this post.

In a tiny sample of 6 very small babies, (under 24 weeks gestation), these authors found that periods of time spent on volume guarantee high frequency had less fluctuation of measured minute volume, and less fluctuation of DCO2, and less desaturation. However, the minute ventilation is measured by the ventilator itself, and without independent validation I am not 100% sure that the numbers are reliable. The DCO2 is calculated by the ventilator based on Alison Froese’s equation that estimated that CO2 elimination is proportional to the tidal volume squared multiplied by the frequency; as the tidal volume is being measured by the ventilator, it really is the same result as the minute ventilation result.

Although the authors state that trans-cutaneous PCO2 was used in all the babies, I don’t see any result of those data. Was PCO2 more stable? I would guess that with only 6 babies the answer is likely no. So this is very limited phase 1 type data, which I think needs more phase 1 data before going on to phase 2 trials, but at least it is a start.

 

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Making Good Decisions; part 2

Posted on 24 May 2016 by Keith Barrington

Green J, et al. Quality versus quantity: The complexities of quality of life determinations for neonatal nurses. Nurs Ethics. 2016. This study used a mixture of quantitative (survey of over 400 nurses) and qualitative (interviews with 24 nurses) methods. The authors showed that over 90% of their respondents believed that quality of life (QoL) should be taken into account when making decisions or very premature babies. Where it gets more interesting is when the authors asked what that actually meant. When they did a content analysis, the answers could be classified as follows :

  • Ability to use one’s brain 39.7%
  • To be independent 37.1%
  • Life which is fulfilling to the individual 34.6%
  • Able to interact with others 27.4%
  • To be happy 20.3%
  • To live life without pain 15.4%
  • Able to contribute to society 15.1%
  • “difficult to define” 8.6%
  • To love and be loved 8.0%
  • To be healthy 8.0%
  • Not to be a burden on family or society 7.7%
  • Other answers were less than 7%.

There are many illuminating quotes in the qualitative part of the study, which basically demonstrate the difficulty that the nurses had in defining what was a life of quality. Most were sure it is important, but couldn’t really say what it was.

There is such a huge difference between “ability to use the brain” and “ability to be independent”…

Einarsdottir J. Emotional experts: parents’ views on end-of-life decisions for preterm infants in Iceland. Medical anthropology quarterly. 2009;23(1):34-50. In this study the author interviewed almost all of the parents of babies under 1000 g born in Iceland over a 4 year period. As the population of Iceland is about 1/10 the population of Montreal that was possible, but still a great achievement. Those parents also believed that QoL was important, when asked what they meant by that, the responses were often characterized by saying that if the child would have ‘no life’ then limiting active treatment would be acceptable. “No life” could signify postponement of inevitable death for a short period by painful treatment, or what parents labeled as “no life” meaning living without crucial human qualities, such as an ability to take part in human communication and interaction.

If we are going to make decisions based on quality of life, then it is important to investigate with parents what they mean by that, what to them is a ‘life of quality’.

I have had parents tell me at times, that they “don’t want a handicapped baby”. Usually with a little discussion, I discover that they are thinking about the most extreme cases, of children who cannot meaningfully communicate. That is very different to most neonatal survivors who are categorized as having impairments; and it is also something we are very very poor at predicting, in the neonatal period.

We can’t even predict survival very well.

Mehler K, et al. Survival Among Infants Born at 22 or 23 Weeks’ Gestation Following Active Prenatal and Postnatal Care. JAMA Pediatrics. 2016. In Cologne, active care is frequently offered at 22 and 23 weeks gestation, and they are really good at it. 65% of the 22 weekers offered active care survived and 72% of the 23 week infants. But the babes had many complications; 20% for example had surgical NEC, 30% had serious intraventricular hemorrhages, retinopathy and BPD were common. The average length of hospitalisation of the non-survivors was around a week. Which suggests to me that one option that could, should, usually be offered is a “trial of therapy”, with clear plans to re-evaluate, with criteria for redirection of care if it is not going well. I certainly don’t think you can call a 65% survival “futile”!

But what becomes of them? Obviously we don’t know for those 22, 23 week infants, but we do know quite a lot about Saroj Saigal’s cohort of babies under 1000g birth weight, who are now in their 30’s. Saigal S, et al. Health, Wealth, Social Integration, and Sexuality of Extremely Low-Birth-Weight Prematurely Born Adults in the Fourth Decade of Life. JAMA Pediatrics. 2016. As usual, a remarkable piece of work from Saroj, which is available free access, so anyone with the interwebs can access it. I will just quote the last paragraph of the abstract

In the fourth decade of life, extremely low-birth-weight survivors achieved similar educational levels and family and partner relationships, and reported fewer risky behaviors compared with controls. However, they had lower levels of employment, income, and self-esteem, and fewer were married and had children. It is therefore essential that these individuals receive necessary support and continued monitoring throughout life.

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