Do it Right – Vancomycin Dosing

bioniche_vancomycin

  After a discussion at work I’ve been looking to current recommendations for proper vancomycin dosing in the ICU and ER.

Drug monitoring should be performed. Through serum concentrations just before the next dose at steady state are recommended. Steady state is achieved normally just before the fourth dose. The minimum through serum concentration should be above 10mg/L to avoid the resistance and at least moderate concentration at the infection theatre. If you have a MRSA with a Minimal Inhibition Concentration (MIC) of 1mg/L or above minimum through concentrations of 15-20mg/L should be targeted. To achieve optimal through concentrations doses of 15-20mg/kg actual body weight (ABW) should be given every 8-12 hours with normal renal function. In case of a MIC of 2 or above conventional dosing regimes fail. If you have a serious ill patient the authors recommend a loading dose of 25-30mg/kg ABW.  Vancomycin Induced Nephrotoxicity is defined as two or three increases in serum creatinine concentrations (0,5mg/dL or 50% above baseline) after several days of therapy. Frequent monitoring is not recommended if there is no risk for renal failure. The authors suggest a weekly monitoring for stable patients. Every patient should receive at least one through serum level and repeated as deemed clinically appropriate.

So dose right, know your MIC.

Rybak, Michael, et al. “Therapeutic monitoring of vancomycin in adult patients: a consensus review of the American Society of Health-System Pharmacists, the Infectious Diseases Society of America, and the Society of Infectious Diseases Pharmacists.” American Journal of Health-System Pharmacy 66.1 (2009): 82-98.

MarylandCC Project - Vanc & Zosyn is NOT the Answer to Everything

EMCrit – Proper Vancomycin Dosing

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Awake Hypothermia

hypothermia-200x224

Cooling and temperature management are key features of any ICU. NICU tend to cool longer than their counterparts in cardiology1. Also neurologists like their patients awake so that they can perform a neurological examination.
A way to reach that goal is to keep your patient awake in the process of cooling. Kama Guluma2 published in 2006 an article in which he described the feasibility of awake cooling in a small patient collective. He used an endovascular cooling device in 10 ischemic stroke patients. Cooling started as soon as possible. In case of systemic thrombolysis the placement of the femoral iv catheter was performed 30 minutes after completion of the t-PA infusion.
On initiation a meperidine drip was started at 30mg/h. A convective surface warming blanket was applied. 24h of cooling.
Shivering was countered by boluses of merepidine. There was no feeding. There was no significant shivering in the study period.

After all this could be a possible way to cool patients in the near future who received definitive treatment of a large vessel occlusion to prevent cerebral edema and hemorrhagic transformation3.

 

1.         Kollmar R, Schwab S. Hypothermia and Ischemic Stroke. Current treatment options in neurology 2012.

2.         Guluma KZ, Hemmen TM, Olsen SE, Rapp KS, Lyden PD. A trial of therapeutic hypothermia via endovascular approach in awake patients with acute ischemic stroke: methodology. Acad Emerg Med 2006;13:820-7.

3.         Hong JM, Lee JS, Song HJ, Jeong HS, Choi HA, Lee K. Therapeutic hypothermia after recanalization in patients with acute ischemic stroke. Stroke; a journal of cerebral circulation 2014;45:134-40.

 

 

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Rebleeding after aSAH – TXA a way to go

Rebleeding after aSAH is a serious problem. Mortality increases in such a case up to 80% (1). Especially ultra-early rebleeding is underestimated (2). So it is reasonable to treat the bleeding. There are basically two methods to perform a definitive bleeding protection. One way to go is the endovascular approach by coiling the aneurysm. The open way done by neurosurgery is clipping the aneurysm.
The decision what way to go should by made in a dialogue between the treating specialities.
In an ideal scenario there would be no delay between diagnosing and treating the aneurysm. But that is not the path we are taking most of the time in a world of limited resources.
An answer is the very detailed guideline of the AHA/ASA for the management of aneursymal subarachnoid haemorrhage (3). They give three conservative recommendations to prevent rebleeding.

1. Between the time of aSAH symptom onset and aneurysm obliteration, blood pressure should be controlled with a titratable agent to balance the risk of stroke, hypertension-related rebleeding, and maintenance of cerebral perfusion pressure (Class I; Level of Evidence B). (New recommendation)

2. The magnitude of blood pressure control to reduce the risk of rebleeding has not been established, but a decrease in systolic blood pressure to <160 mm Hg is reasonable (Class IIa; Level of Evidence C). (New recommendation) 

3. For patients with an unavoidable delay in obliteration of aneurysm, a significant risk of rebleeding, and no compelling medical contraindications, short-term (<72 hours) therapy with tranexamic acid or aminocaproic acid is reasonable to reduce the risk of early aneurysm rebleeding (Class IIa; Level of Evidence B). (Revised recommendation from previous guidelines)

Let us have a look at recommendation three. Antifibrinolytic therapies were tested during the last decades. After all they showed no benefit with the main complication of thromboembolic events. These studies had a maximum of 14d to include a patient to the first dose of TXA (tranexamic acid 4-9g/d) or EACA (epsilon aminocaproic acid 24g/d) and treated the patients up to 6 weeks. For a reduction of rebleeding events of about 50% they suffered for an increase of ischemic events by about 50%. So with no benefit at hand that kind of therapy was dimissed (9).
In 2002 Hillmann et. all. published a prospective randomised trial in which they administered TXA directly after diagnosing an aSAH. They gave 1g immediately and 1g each 6h until aneurysma occlusion or 72h. Tranexamic acid, a synthetic derivative of the amino acid lysine, is an antifibrinolytic agent that acts by binding to plasminogen and blocking the interaction of plasmin(ogen) with fibrin, thereby preventing dissolution of the fibrin clot (4). 254 patients received TXA and 251 placebo. The incidence of rebleeding was reduced from 10,8% to 2,4%. This result were repeated by Harrigan (5) and Starke (6). In the retrospective study ogf Harrigan is of note, three of the five rebleeds never received the drug before they bled.

STARKE AHA
For the future there is a randomized controlled trial (ULTRA) (7) in the Netherlands. They are looking for potential benefit in preventing rebleeding as well as preventing DINDs. The aim of this study is to investigate whether ultra-early and short-term administration of the antifibrinolytic agent tranexamic acid (TXA), as add-on to standard SAH management, leads to better functional outcome. I await a positive result. Take a look at existing data and you know, it is just a problem of underpowered trials.

STARKE AHA2
Baharoglu et. all. (8) published in September 2013 a chochrane report on TXA in which they not recommended the use in case of SAH. In the end they stated in contrast to the older cochrane report (9) that the ultra early giving of antifibrinolytics shows promise. In their point of view the current level of evidence is not sufficient to use it outside of clinical trials. this is what they actually do (7).

My personal opinion  goes alongside with the AHA/ASA guideline. Especially if you bled under PAH therapy TXA should be administered.

1. Ameen A, Illingworth R. Anti-fibrinolytic treatment in the pre-operative management of subarachnoid haemorrhage caused by ruptured intracranial aneurysm. Journal of Neurology, Neurosurgery & Psychiatry 1981;44:220-6.
2. Fujii Y, Takeuchi S, Sasaki O, Minakawa T, Koike T, Tanaka R. Ultra-early rebleeding in spontaneous subarachnoid hemorrhage. J Neurosurg 1996;84:35-42.
3. Connolly ES, Rabinstein AA, Carhuapoma JR, et al. Guidelines for the Management of Aneurysmal Subarachnoid Hemorrhage A Guideline for Healthcare Professionals From the American Heart Association/American Stroke Association. Stroke; a journal of cerebral circulation 2012;43:1711-37.
4. McCormack PL. Tranexamic Acid. Drugs 2012;72:585-617.
5. Harrigan MR, Rajneesh KF, Ardelt AA, Fisher III WS. Short-term antifibrinolytic therapy before early aneurysm treatment in subarachnoid hemorrhage: effects on rehemorrhage, cerebral ischemia, and hydrocephalus. Neurosurgery 2010;67:935-40.
6. Starke RM, Kim GH, Fernandez A, et al. Impact of a protocol for acute antifibrinolytic therapy on aneurysm rebleeding after subarachnoid hemorrhage. Stroke; a journal of cerebral circulation 2008;39:2617-21.
7. Germans MR, Post R, Coert BA, Rinkel GJ, Vandertop WP, Verbaan D. Ultra-early tranexamic acid after subarachnoid hemorrhage (ULTRA): study protocol for a randomized controlled trial. Trials 2013;14:143.
8. Baharoglu, M. I., Germans, M. R., Rinkel, G. J. E., Algra, A., Vermeulen, M., van Gijn, J., & YBWEM, R. (2013). Drugs for preventing blood clot dissolution (antifibrinolytic therapy) to reduce the occurrence of rebleeding in aneurysmal subarachnoid haemorrhage. Health.
9. Roos, Y. B., Rinkel, G. J., Vermeulen, M., Algra, A., & Van Gijn, J. (2003). Antifibrinolytic therapy for aneurysmal subarachnoid haemorrhage. Cochrane Database Syst Rev, 2.

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Another failed neuroprotective agent – ALIAS part 2

Today i give a little review about ALBUMIN 25% as a neuroprotective agent in case of ischemic stroke. Ginsberg et. all. published in the LANCET NEUROLOGY a placebo controlled double blinded phase 3 trial  where they looked for a favourable outcome for the use of ALBUMIN in the early treatment of stroke. ALIAS part 1 showed a trend to a favourable outcome. So about 800 patients were enrolled. Patients in the verum group received 25% ALBUMIN (2g per kg/KG). Favourable outcome was defined as NIH-SS of 0 and 1 or/and mRS of 0 and 1 at 90 days. About 85% in both groups received thrombolysis. The investigation was stopped due to futility in september 2012. There was no outcome differ after 841 patients enrolled. During the early phase of the trial there was promissing data in favour of ALB treatment.
Pulmonary oedema was more common as well as intracerebral hemorrhage in the ALB group.
I personally exspected a different result. In the light of SAFE-TBI there could have been even a different result showing harm if using ALB.
So standard fluid for resus a patient with ischemic insult remains cristalloid. But i think that you have an option for ALB in selected cases.

Notes:
SAFE-TBI, Cooper et all., J Neurotrauma. 2013 Apr 1;30(7):512-8. doi: 10.1089/neu.2012.2573. Epub 2013 Mar 21.
ALIAS part 1, Hill et all., Stroke. 2011 Jun;42(6):1621-5. doi: 10.1161/STROKEAHA.110.610980. Epub 2011 May 5.
ALIAS part 2, Ginsberg et all., Lancet Neurol. 2013 Sep 26. pii: S1474-4422(13)70223-0. doi: 10.1016/S1474-4422(13)70223-0. [Epub ahead of print]

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SOP Unplanned exchange of tracheostomy tube

 

SOP unplane exchange tracheostomy tube

Hello there,

 

This is actually my first article about a medical topic in this new blog about critical care. My intention is to wrtite about neuro ICU care especially. As you can easily grab when yup recall the name e of the website.

I work as a fellow in critical care in a university hospital in Germany. During my last year i encountered several critical situations which made my think. Most of the time we ran deeply into trouble because we were not fully prepared or never anticipated how much s* could possibly rain on us.

One of these critical situation is when you´re in trouble because of a non-functional tracheostomy tube, especially if you did a percutaneous dilatation tracheostomy and you are within first seven days. Prof. Ellger from the department of anaesthology of my hospital and Dr. Bösel form the university of Heidelberg wrote together an SOP if you are facing this hairy situations.

The article is written in german and is linked below.

If a endotracheal tube after percutaneous dilatation tracheostomy is removed the artificial airway collapses. If the removing itself was not intented in the first place and the patient is not breathing translarygeal this can have fatal consequences. To prevent a chicken bomb or a cluster f* (hello Mr. Reid) a SOP (a standard operation procedure) makes a lot of sense.

Elective changing of a endotracheal tube after percutaneous dilatation tracheostomy within the first days should be avoided. The pretracheal softissue tends move backward in the predilation status and by this way to occlude our new airway. So Basel recommends to use a inlay for the tube. So in case of occlusion the lumen remains open after removing the inlay. The tube has to be only replaced if there is a deflating cuff or an obstruction even after removing the inlay.

In this case the patient has to be preoxygenated and the resus-equipment has ti be moved to the bedplace. Try to manual ventilate the patient.

Suction is a crucial part in this protocol. If it is possible to place a suction catheter (why not in a case of a deflating cuff) you can place a bougie or a tubus exchanger as well. So you can change the tube over the bougie and you save the day. After placing of the tracheostomy tube you have to check endtidal CO2 waveform pattern and clinical signs for correct placement.

If you are not that lucky and you cloud not place either the suction catheter nor the tubus over the bougie you have to check how long it has been since the tube has been placed.

It is crucial because if you try to change a newly placed tube by dilation tracheotomy there is a great change that the artificial airway collapses.

If you are off the hook and tracheostomy is longer then seven days in the past you can try to remove the tube und place a new one over the old tracheostomy.

If not, do laryngoscopy und place a tube. This is best done using VL. If you have visualised passing the cords, remove the tracheostomy tube and check again for correct placement.

In case of you are able to place either a endotracheal or a tracheostomy tube switch to BMV and difficult airway procedure SOP.

My daily practice changed a bit after reading this article. We have never used an inlay for our tracheostomy tubes. Leave an inlay in the first week seems to be reasonable.

If you new in the business of tracheostomy there is another very helpful article. You find the link below.

I hope this of interest for you guys out there. See you soon. Please make a comment.

SOP unplane exchange tracheostomy tube

 

 

Bibliography

Ellger, B. and J. Bösel “SOP-Struktur im Allgemeinen und SOP-Trachealkanülenwechsel im Speziellen.”Intensivmedizin up2date 9(02): 94-96.

Maxwell, B. G., et al. (2013). “Percutaneous Tracheostomy at the Bedside 13 Tips for Improving Safety and Success.” J Intensive Care Med.

 

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