Is skin to skin care truly good for the developing brain?

Is skin to skin care truly good for the developing brain?

Skin to skin care or kangaroo care is all the rage and I am the first one to offer my support for it.  Questions persist though as to whether from a physiological standpoint, babies are more stable in an isolette in a quiet environment or out in the open on their mother or father’s chests. Bornhorst et al expressed caution in their study Skin-to-skin (kangaroo) care, respiratory control, and thermoregulation.  In a surprising finding, babies with an average gestational age of 29 weeks were monitored for a number of physiological parameters and found to have more frequent apnea and higher heart rates than when in an isolette.  The study was small though and while there were statistical differences in these parameters they may not have had much clinical significance (1.5 to 2.8 per hour for apnea, bradycardia or desaturation events).  Furthermore, does an increase in such events translate into any changes in cerebral oxygenation that might in turn have implications for later development?  Tough to say based on a study of this magnitude but it certainly does raise some eyebrows.

What if we could look at cerebral oxygenation?

As you might have guessed, that is exactly what has been done by Lorenz L et al in their recent paper Cerebral oxygenation during skin-to-skin care in preterm infants not receiving respiratory support.The goal of this study was to look at 40 preterm infants without any respiratory distress and determine whether cerebral oxygenation (rStO2)was better in their isolette or in skin to skin care (SSC).  They allowed each infant to serve as their own control by have three 90 minute periods each including the first thirty minutes as a washout period.  Each infant started their monitoring in the isolette then went to SSC then back to the isolette.  The primary outcome the power calculation was based on was the difference in rStO2 between SSC and in the isolette.  Secondary measures looked at such outcomes as HR, O2 sat, active and quiet sleep percentages, bradycardic events as lastly periods of cerebral hypoxia or hyperoxia.  Normal cerebral oxygenation was defined as being between 55 to 85%.

Surprising results?

Perhaps its the start of a trend but again the results were a bit surprising showing a better rStO2 when in the isolette (−1.3 (−2.2 to −0.4)%, p<0.01).  Other results are summarized in the table below:

Mean difference in outcomes
Variable SSC Isolette Difference in mean p
rStO2 73.6 74.8 -1.3 <0.01
SpO2 (median) 97 97 -1.1 0.02
HR 161 156 5 <0.01
% time in quiet sleep 58.6 34.6 24 <0.01

No differences were seen in bradycardic events, apnea, cerebral hypoexmia or hyperoxemia.  The authors found that SSC periods in fact failed the “non-inferiority” testing indicating that from a rStO2 standpoint, babies were more stable when not doing SSC!  Taking a closer look though one could argue that even if this is true does it really matter?  What is the impact on a growing preterm infant if their cerebral oxygenation is 1.3 percentage points on average lower during SSC or if their HR is 5 beats per minute faster?  I can’t help but think that this is an example of statistical significance without clinical significance.  Nonetheless, if there isn’t a superiority of these parameters it does leave one asking “should we keep at it?”

Benefits of skin to skin care

Important outcomes such as reductions in mortality and improved breastfeeding rates cannot be ignored or the positive effects on family bonding that ensue. Some will argue though that the impacts on mortality certainly may be relevant in developing countries where resources are scarce but would we see the same benefits in developed nations.  The authors did find a difference though in this study that I think benefits developing preterm infants across the board no matter which country you are in.  That benefit is that of Quiet Sleep (QS).  As preterm infants develop they tend to spend more time in QS compared to active sleep  (AS).  From Doussard- Roossevelt J, “Quiet sleep consists of periods of quiescence with regular respiration and heart rate, and synchronous EEG patterns. Active sleep consists of periods of movement with irregular respiration and heart rate, and desynchronous EEG patterns.”  In the above table one sees that the percentage of time in QS was significantly increased compared to AS when in SSC.  This is important as neurodevelopment is thought to advance during periods of QS as preterm infants age.

There may be little difference favouring less oxygen extraction during isolette times but maybe that isn’t such a good thing?  Could it be that the small statistical difference in oxygen extraction is because the brain is more active in laying down tracks and making connections?  Totally speculative on my part but all that extra quiet sleep has got to be good for something.

To answer the question of this post in the title I think the answer is a resounding yes for the more stable infant.  What we don’t know at the moment except from anecdotal reports of babies doing better in SSC when really sick is whether on average critically ill babies will be better off in SSC.  I suspect the answer is that some will and some won’t.  While we like to keep things simple and have a one size fits all answer for most of our questions in the NICU, this one may not be so simple.  For now I think we keep promoting SSC for even our sick patients but need to be honest with ourselves and when a patient just isn’t ready for the handling admit it and try again when more stable.  For the more stable patient though I think giving more time for neurons to find other neurons and make new connections is a good thing to pursue!

Is it time to (ESC)ape from Neonatal Abstinence

Is it time to (ESC)ape from Neonatal Abstinence

I don’t envy our nurses who care for babies withdrawing from various opiates and other substances.  These assignments are definitely a challenge and require a great deal of patience and depending on the shrillness of an infant’s cry a good set of earplugs. Nonetheless we do our best with these infants to keep them calm and avoid as much stimulation as we can as we attempt to minimize the excitability of their nervous system.

Over 40 years ago the Finnegan Neonatal Abstinence scoring system was developed to assist medical teams by providing as objective a system as possible to compare one infant to another and determine when and if a patient should be treated pharmacologically.  Unfortunately there is a problem inherent with this scoring system.  It is the same problem that exists when you don’t have a blinded research trial.  Imagine you are caring for an infant and you were given no history about drug exposure.  How might you score a patient like that compared to one in which you are told has been exposed to illicit substances?  Your senses are heightened and moreover if you were told this baby is “withdrawing terribly” or “is awful at night” you are biased. How are you likely to score such a patient when they are “on the edge” of being counted as a 1 or a 0 in a category?  I bet in many cases, especially if you haven’t taken care of many such patients you err on the side of caution and score them on the high side.  It is human nature.  When the possible outcome of failing to recognize a withdrawing patient is a seizure, no one wants to be on when it happens having their scoring questioned.  Have a look at the scoring tool though.

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There is a lot of stuff in there to check off!  What if it could be simpler?

The ESC Tool

In early May, news began to break of an abstract being presented at the Pediatric Academic Society meeting.  The news story from the AAP can be found here.  The ESC tool is a three question tool used to assess whether an infant requires treatment for withdrawal.

E – Eat (is an infant is able to eat 1 or more ounce per feeding)

S – Sleeping (sleep for an hour or longer undisturbed)

C – Console (Be consoled in 10 minutes or less.)

If all three criteria are met, the patient does not need treatment.  If one or more criteria are not met the housestaff are notified and first non-pharmacologic and then pharmacologic means are employed if necessary to control symptoms.

The authors did something quite interesting.  They looked at 50 patients with 201 hospital days with prenatal exposures to opiates and applied the ESC criteria to guide treatment.  Concurrently they captured the Finnegan scores but did not use them to guide treatment.

The findings I hope you will agree are quite interesting!

“FNASS scores indicated starting morphine in 30 infants (60%). Morphine was actually started on only 6 patients (12%) (p< 0.0001) based on the ESC approach. The FNASS led protocol directed initiating or increasing meds on 24.6% of days compared to 2.7% of days using the ESC approach (p< 0.0001). The FNASS approach directed that morphine was either not started or decreased on 65.8% of days compared with 94.4% of days using the ESC approach (p< 0.0001). There were no readmissions or reported adverse events.

Pretty amazing but…

The ESC approach greatly reduced the need for treatment and as the authors state there were no readmissions or reported adverse events.  What we don’t know and will be needed I suspect before anyone will adopt this strategy (which I have to say again is so much simpler that current approaches) is how these children do in the long run.  If the system is undertreating withdrawal, could we see downstream impacts of a “kinder and gentler” approach?  One outcome that will be reported soon in the next month is length of stay.  I am eagerly awaiting further results as I for one think that a simpler approach to these patients may be just what the doctor ordered.  I think the nurses might thank us as well but we will see just how appropriate it is!

The Abstract reporting these findings can be found below

Novel Approach to Evaluating and Treating Infants with Neonatal Abstinence Syndrome

Communication is certainly key

Communication is certainly key

If there is one thing that keeps coming back as a lesson again and again in life it is the importance of communication.  Whether it be in the home or at work, too many of our “problems” in the workplace come down to whether or not our teams talk to one another effectively.

A tremendous source of stress of course is the unknown. When a baby is born in the field we can only rely on the information being presented to us via telephone contact.  In the melee that occurs on arrival of a potentially sick patient, details can be missed.

The following video illustrates such a situation and I believe aptly provides a good example of how to communicate in such a way that the stress of the situation is relieved. If we can all strive to slow things down just a little we may find that communication eliminates much of the tension in such a situation.

If you are looking to “slow” down your life and improve things such as communication style you may want to have a look at the book “In Praise of Slow” as we head into the weekend.  It’s all about slowing things down to actually improve efficiency.  51giI-ZIOtL._SX332_BO1,204,203,200_The world is moving pretty quickly these days and couldn’t we all do with a little more efficiency and less wasted time?  In Neonatology we are confronted with surprises every day, often with little notice.  If we can slow things down and pass on the needed information to the right people at the right time we will help to reduce errors if we can just get it right the first time!

 

 

As you can tell I am a big fan of simulation in helping to create high functioning teams!  More of these videos can  be accessed on my Youtube channel at

All Things Neonatal YouTube

To receive regular updates as new videos are added feel free to subscribe!

Lastly a big thank you to NS, RH and GS without whom none of this would have been possible!

 

Should 24 hour Neonatologist In-House Coverage Be The Rule ?

Should 24 hour Neonatologist In-House Coverage Be The Rule ?

I have often said that if this came to pass as a mandatory requirement that I would make an announcement shortly thereafter that I was moving on to another career.  I think people thought I was kidding but I can put in writing for all to see that I am serious!  The subject has been discussed for some time as I can recall such talks with colleagues both in my current position and in other centres. The gist of the argument for staying in-house is that continuity is improved over that period and efficiency gained by avoiding handovers twice a day .  How many times have you heard at signover that extubation will be considered for the following morning or to keep the status quo for another issue such as feeding until the next day.  No doubt this is influenced by a new set of eyes being in the unit and a change in approach to being one of “putting out fires” overnight.  The question then is whether having one Neonatologist there for 24 hours leads to better consistency and with it better outcomes.   With respect to PICUs the AAP has previously recommended that 24 hour in-house coverage by an intensivist be the standard so should Neonatology follow suit?

A Tale of Two Periods

My friends in Calgary, Alberta underwent a change in practice in 2001 in which they transitioned from having an in-house model of Neonatologist coverage for 24 hours a day to one similar to our own centres where the Neonatologist after handover late afternoon could take call from home.  An article hot off the presses entitled Twenty-Four hour in-house neonatologist coverage and long-term neurodevelopmental outcomes of preterm infants seeks to help answer this question.  The team undertook a retrospective analysis of 387 infants born at < 28 weeks gestational age during the periods of 1998-2000 (24 hour period, N=179 infants) vs 2002 – 2004 (day coverage, N= 208 infants) with the goal of looking at the big picture being follow-up for developmental outcome at 3 years.  This is an important outcome as one can look at lots of short term outcomes (which they also did) but in the end what matters most is whether the infants survive and if they do are they any different in the long term.

As with any such study it is important to look at whether the infants in the two periods are comparable in terms of risk factors for adverse outcome.  Some differences do exist that are worth noting.

Increased risk factors in the 24 hour group

  1. Chorioamnionitis
  2. Maternal smoking
  3. Smaller birthweight (875 vs 922 g)
  4. Confirmed sepsis (23% vs 14%)
  5. Postnatal steroids (45% vs 8%) – but duration of ventilation longer in the day coverage group likely due to less postnatal steroids ( 31 vs 21 days)

All of these factors would predict a worse outcome for these infants but in the end for the primary outcome of neurodevelopmental impairment there was no difference.  Even after controlling for postnatal steroids, birth weight, sex and 5 minute apgar score there was still no difference.

What might this mean?

Looking at this with a glass is half full view one might say that with all of the factors above predicting worse outcome for infants, the fact that the groups are not different in outcome may mean that the 24 hour model does indeed confer a benefit.  Maybe having a Neonatologist around the clock means that care is made that much better to offset the effect of these other risk factors?  On the other hand another explanation could also be that the reason there is no difference is that the sample just isn’t big enough to show a difference.  In other words the size of the study might be underpowered to find a difference in developmental outcome.

One of the conclusions in this study is that the presence of a Neonatologist around the clock may have led to earlier extubation and account for the nearly 10 day difference in duration of ventilation.  While I would love to believe that for personal reasons I don’t think we can ignore the fact that in the earlier epoch almost 50% of the babies received postnatal steroids compared to 8% in the later period.  Postnatal steroids work and they do so by helping us get babies off ventilators.  It is hard to ignore that point although I woudl like to take credit for such an achievement.

For now it would appear that I don’t feel compelled to stay overnight in the hospital unless it is necessary due to patient condition necessitating me having my eye on the patient.  I am not sure where our field will go in the future but for now I don’t see the evidence being there for a change in practice.  With that I will retire to my bedroom while I am on call and get some rest (I hope).

The New BPD That Matters

The New BPD That Matters

As a Neonatologist I doubt there are many topics discussed over coffee more than BPD.  It is our metric by which we tend to judge our performance as a team and centre possibly more than any other.  This shouldn’t be that surprising.  The dawn of Neonatology was exemplified by the development of ventilators capable of allowing those with RDS to have a chance at survival.  image040As John F Kennedy discovered when his son Patrick was born at 34 weeks, without such technology available there just wasn’t much that one could do.  As premature survival became more and more common and the gestational age at which this was possible younger and younger survivors began to emerge.  These survivors had a condition with Northway described in 1967 as classical BPD.  This fibrocystic disease which would cripple infants gave way with modern ventilation to the “new bpd”.

The New BPD

The disease has changed to one where many factors such as oxygen and chorioamnionitis combine to cause arrest of alveolar development along with abnormal branching and thickening of the pulmonary vasculature to create insufficient air/blood interfaces +/- pulmonary hypertension.  This new form is prevalent in units across the world and generally appears as hazy lungs minus the cystic change for the most part seen previously. Defining when to diagnose BPD has been a challenge.  Is it oxygen at 28 days, 36 weeks PMA, x-ray compatible change or something else?  The 2000 NIH workshop on this topic created a new approach to defining BPD which underwent validation towards predicting downstream pulmonary morbidity in follow-up in 2005.  That was over a decade ago and the question is whether this remains relevant today.

Benchmarking

I don’t wish to make light of the need to track our rates of BPD but at times I have found myself asking “is this really important?”  There are a number of reasons for saying this.  A baby who comes off oxygen at 36 weeks and 1 day is classified as having BPD while the baby who comes off at 35 6/7 does not.  Are they really that different?  Is it BPD that is keeping our smallest babies in hospital these days?  For the most part no.  Even after they come off oxygen and other supports it is often the need to establish feeding or adequate weight prior to discharge that delays things these days.  Given that many of our smallest infants also have apnea long past 36 weeks PMA we have all seen babies who are free of oxygen at 38 weeks who continue to have events that keep them in hospital.  In short while we need to be careful to minimize lung injury and the consequences that may follow the same, does it matter if a baby comes off O2 at 36, 37 or 38 weeks if they aren’t being discharged due to apnea or feeding issues?  It does matter for benchmarking purposes as one unit will use this marker to compare themselves against another in terms of performance.  Is there something more though that we can hope to obtain?

When does BPD matter?

The real goal in preventing BPD or at least minimizing respiratory morbidity of any kind is to ensure that after discharge from the NICU we are sending out the healthiest babies we can into the community.  Does a baby at 36 weeks and one day free of O2 and other support have a high risk of coming back to the hospital after discharge or might it be that those that are even older when they free of such treatments may be worse off after discharge.  The longer it takes to come off support one would think, the more fragile you might be.  This was the goal of an important study just published entitled Revisiting the Definition of Bronchopulmonary Dysplasia: Effect of Changing Panoply of Respiratory Support for Preterm Neonates.  This work is yet another contribution to the pool of knowledge from the Canadian Neonatal Network.  In short this was a retrospective cohort study of 1503 babies born at <29 weeks GA who were assessed at 18-21 months of age. The outcomes were serious respiratory morbidity defined as one of:

(1) 3 or more rehospitalizations after NICU discharge owing to respiratory problems (infectious or noninfectious);

(2) having a tracheostomy

(3) using respiratory monitoring or support devices at home such as an apnea monitor

or pulse oximeter

(4) being on home oxygen or continuous positive airway pressure at the time of assessment

While neurosensory impairment being one of:

(1) moderate to severe cerebral palsy (Gross Motor Function Classification System ≥3)

(2) severe developmental delay (Bayley Scales of Infant and Toddler

Development Third Edition [Bayley III] composite score <70 in either cognitive, language, or motor domains)

3) hearing aid or cochlear implant use

(4) bilateral severe visual impairment

What did they find?

The authors looked at 6 definitions of BPD and applied examined how predictive they were of these two outcomes.  The combination of oxygen and/or respiratory support at 36 weeks PMA had the greatest capacity to predict this composite outcome.  It was the secondary analysis though that peaked my interest.  Once the authors identified the best predictor of adverse outcome they sought to examine the same combination of respiratory support and/oxygen at gestational ages from 34 -44 weeks PMA.  The question here was whether the use of an arbitrary time point of 36 weeks is actually the best number to use when looking at these longer term outcomes.  Great for benchmarking but is it great for predicting outcome?

It turns out the point in time with the greatest likelihood of predicting occurrence of serious respiratory morbidity is 40 weeks and not 36 weeks.  Curiously, beyond 40 weeks it becomes less predictive.  With respect to neurosensory impairment there is no real difference at any gestational age from 34-44 weeks PMA.

From the perspective of what we tell parents these results have some significance.  If they are to be believed (and this is a very large sample) then the infant who remains on O2 at 37 weeks but is off by 38 or 39 weeks will likely fair better than the baby who remains on O2 or support at 40 weeks.  It also means that the risk of neurosensory impairment is largely set in place if the infant born at < 29 weeks remains on O2 or support beyond 33 weeks.  Should this surprise us?  Maybe not.  A baby who is on such support for over 5 weeks is sick and as a result the damage to the developing brain from O2 free radical damage and/or exposure to chorioamnionitis or sepsis is done.

It will be interesting to see how this study shapes the way we think about BPD.  From a neurosensory standpoint striving to remove the need for support by 34 weeks may be a goal worth striving for.  Failure to do so though may mean that we at least have some time to reduce the risk of serious respiratory morbidity after discharge.

Thank you to the CNN for putting out what I am sure will be a much discussed paper in the months to come.