Category Archives: ICU

Stuff relevant to patients on ICU

Peripheral vasoactive infusions

periph-vasoactive-iconIt is often recommended that vasoactive agents are infused via central lines because of the risk of infiltration and tissue injury. The Children’s Hospital Boston transport team describe transport of 73 infants and children who were treated during interhospital transport with vasoactive medications via a peripheral intravenous line.
Median transport time was only 38 minutes (range 3[!!]-216) and median age was 1 (birth to 19) .
Dopamine monotherapy was given in 66 patients, adrenaline (epinephrine) monotherapy in 2, dobutamine plus phenylephrine in 1, dopamine and epinephrine in 3, and dopamine, dobutamine, and epinephrine in 1 patient.
In this retrospective study no patients developed infiltration or other complications related to peripheral vasoactive agents during interfacility transport. Eleven of the 73 patients, however, did develop infiltrates related to vasoactive infusion after arrival at the accepting institution; all infiltrates involved only minimal blanching and/or erythema, and all resolved without significant intervention and caused no lasting tissue injury. The risk of infiltration rose with increasing medication dose and duration of use.
Interesting that noradrenaline (norepinephrine) wasn’t used. This study is interesting but the overwhelming predominance of dopamine makes it hard to extrapolate this to European or Australasian practice.
The Use of Vasoactive Agents Via Peripheral Intravenous Access During Transport of Critically Ill Infants and Children
Pediatr Emerg Care. 2010 Aug;26(8):563-6

rFVIIa did not reduce trauma mortality

An industry sponsored placebo-controlled multicentre randomised controlled trial has shown no mortality reduction from recombinant activated Factor VII (rFVIIa) in patients with trauma.
rFVIIa acts physiologically by enhancing clot formation in the presence of tissue factor expressed on injured or ischemic vascular subendothelium. It also acts pharmacologically, binding directly to activated platelets, increasing thrombin burst, and promoting the formation of a stable hemostatic plug.
Blunt and/or penetrating trauma patients aged 18 years to 70 years were eligible if they had continuing torso and/or proximal lower extremity bleeding after receiving 4 units of RBCs despite standard hemostatic interventions. There was no 30 day mortality reduction, although fewer blood products were transfused from dosing to 24 hours in the rFVIIa group.
No significant difference was seen in the safety profile of rFVIIa compared with placebo.
The CONTROL trial was terminated early (573 of 1502 patients) after an interim analysis suggested a high likelihood of futility in demonstrating the primary endpoint in the blunt trauma population.
Results of the CONTROL Trial: Efficacy and Safety of Recombinant Activated Factor VII in the Management of Refractory Traumatic Hemorrhage
Journal of Trauma-Injury Infection & Critical Care September 2010 69(3):489-500

Alternative toothless mask position

An alternative position for holding the facemask when bag-mask ventilating edentulous patients is described and evaluated. 49 patients with inadequate seal and air leak during two-hand positive-pressure ventilation had significantly improved ventilation as measured by reduced air leak and increased expiratory volume when the caudal end of the mask was repositioned above the lower lip while maintaining neck extension.

Face mask ventilation in edentulous patients: a comparison of mandibular groove and lower lip placement
Anesthesiology. 2010 May;112(5):1190-3

Taming the Ketamine Tiger

A paper of great interest for those of us who spend a lot of time teaching the use of ketamine describes its history from initial synthesis in the early 1960s. Ketamine pioneer Edward F. Domino, M.D describes how it was first given to humans in 1964: ‘Our findings were remarkable! The overall incidence of side effects was about one out of three volunteers. Frank emergence delirium was minimal. Most of our subjects described strange experiences like a feeling of floating in outer space and having no feeling in their arms or legs.

Domino goes on to list interesting anecdotes in ketamine’s history, like how his wife came up with the term ‘dissociative anaesthetic’ and how physicians and their partners experimenting with ketamine in the 1970s tried communicating with dolphins, fell in love, and froze to death in a forest. The pharmacology of ketamine is described along with its effects on pain and even depression.
Taming the ketamine tiger.
Anesthesiology. 2010 Sep;113(3):678-84 Free Full Text

Roc quicker when bicarb added

Interesting…a randomised trial compared rocuronium mixed with saline against rocuronium mixed 1:1 with 8.4% sodium bicarbonate.
The principal finding was that rocuronium mixed with sodium bicarbonate 8.4% is more potent than that of rocuronium alone; it resulted in a more rapid onset time, and a prolonged recovery from the neuromuscular blockade.
It is likely that this effect is because the drug is weakly basic, and the change in pH from 4.01 to 7.78 seen after the addition of sodium bicarbonate 8.4% to rocuronium increases the amount of unionised rocuronium in the solution.
I suppose we could just give a bigger dose if we need to though.
Potency and recovery characteristics of rocuronium mixed with sodium bicarbonate
Anaesthesia. 2010;65(9):899–903

FV cannulation in kids: 60° abduction

An ultrasound study on infants and children under general anaesthesia evaluated the femoral vein with the patients’ legs at 30° and 60° of abduction and their hips externally rotated. Measurements were taken at the level of the inguinal crease and 1 cm below the crease.
Hip rotation with 60° leg abduction significantly decreased the overlap between femoral vein and femoral artery at the level of the inguinal crease in both infants and children.
The authors recommend the optimal place for femoral vein cannulation in paediatric patients seems to be at the level of the inguinal crease with 60° leg abduction and external hip rotation.
Ultrasonographic evaluation of the femoral vein in anaesthetised infants and young children
Anaesthesia. 2010;65(9):895–898

New ICH Guidelines

A Guideline for Healthcare Professionals From the American Heart Association/American Stroke Association on the management of spontaneous intracerebral haemorrhage has been published in Stroke. The full text is available here.
In summary:
Medical Treatment for ICH

  • Patients with a severe coagulation factor deficiency or severe thrombocytopenia should receive appropriate factor replacement therapy or platelets, respectively
  • Patients with ICH whose INR is elevated due to oral anticoagulants (OAC) should have their warfarin withheld, receive therapy to replace vitamin K–dependent factors and correct the INR, and receive intravenous vitamin K. Prothrombin Complex Concentrates have not shown improved outcome compared with FFP but may have fewer complications compared with FFP and are reasonable to consider as an alternative to FFP.
  • rFVIIa does not replace all clotting factors, and although the INR may be lowered, clotting may not be restored in vivo; therefore, rFVIIa is not routinely recommended as a sole agent for OAC reversal in ICH
  • Although rFVIIa can limit the extent of hematoma expansion in noncoagulopathic ICH patients, there is an increase in thromboembolic risk with rFVIIa and no clear clinical benefit in unselected patients. Thus rFVIIa is not recommended in unselected patients. Further research to determine whether any selected group of patients may benefit from this therapy is needed before any recommendation for its use can be made.
  • The usefulness of platelet transfusions in ICH patients with a history of antiplatelet use is unclear and is considered investigational
  • Patients with ICH should have intermittent pneumatic compression for prevention of venous thromboembolism in addition to elastic stockings
  • After documentation of cessation of bleeding, low-dose subcutaneous low-molecular-weight heparin or unfractionated heparin may be considered for prevention of venous thromboembolism in patients with lack of mobility after 1 to 4 days from onset
  • Blood Pressure

    • Until ongoing clinical trials of BP intervention for ICH are completed, physicians must manage BP on the basis of the present incomplete efficacy evidence. Current suggested recommendations for target BP in various situations are listed in an accompanying table and may be considered
    • In patients presenting with a systolic BP of 150 to 220 mmHg, acute lowering of systolic BP to 140 mm Hg is probably safe

    Inpatient Management and Prevention of Secondary Brain Injury

    • Initial monitoring and management of ICH patients should take place in an intensive care unit with physician and nursing neuroscience intensive care expertise
    • Glucose should be monitored and normoglycemia is recommended

    Seizures and Antiepileptic Drugs

    • Clinical seizures should be treated with antiepileptic drugs
    • Continuous EEG monitoring is probably indicated in ICH patients with depressed mental status out of proportion to the degree of brain injury
    • Patients with a change in mental status who are found to have electrographic seizures on EEG should be treated with antiepileptic drugs
    • Prophylactic anticonvulsant medication should not be used

    Procedures/Surgery

    • Patients with a GCS score of ≤8, those with clinical evidence of transtentorial herniation, or those with significant IVH or hydrocephalus might be considered for ICP monitoring and treatment. A cerebral perfusion pressure of 50 to 70 mmHg may be reasonable to maintain depending on the status of cerebral autoregulation
    • Ventricular drainage as treatment for hydrocephalus is reasonable in patients with decreased level of consciousness

    Intraventricular Hemorrhage Recommendation

    • Although intraventricular administration of recombinant tissue-type plasminogen activator in IVH appears to have a fairly low complication rate, efficacy and safety of this treatment is uncertain and is considered investigational

    Clot Removal

    • For most patients with ICH, the usefulness of surgery is uncertain. Specific exceptions to this recommendation follow
    • Patients with cerebellar hemorrhage who are deteriorating neurologically or who have brainstem compression and/or hydrocephalus from ventricular obstruction should undergo surgical removal of the hemorrhage as soon as possible. Initial treatment of these patients with ventricular drainage alone rather than surgical evacuation is not recommended
    • For patients presenting with lobar clots ≥30 mL and within 1 cm of the surface, evacuation of supratentorial ICH by standard craniotomy might be considered
    • The effectiveness of minimally invasive clot evacuation utilizing either stereotactic or endoscopic aspiration with or without thrombolytic usage is uncertain and is considered investigational
    • Although theoretically attractive, no clear evidence at present indicates that ultra-early removal of supratentorial ICH improves functional outcome or mortality rate. Very early craniotomy may be harmful due to increased risk of recurrent bleeding

    Outcome Prediction and Withdrawal of Technological Support

    • Aggressive full care early after ICH onset and postponement of new DNR orders until at least the second full day of hospitalization is probably recommended. Patients with preexisting DNR orders are not included in this recommendation. Current methods of prognostication in individual patients early after ICH are likely biased by failure to account for the influence of withdrawal of support and early DNR orders. Patients who are given DNR status at any point should receive all other appropriate medical and surgical interventions unless otherwise explicitly indicated.

    Prevention of Recurrent ICH

    • In situations where stratifying a patient’s risk of recurrent ICH may affect other management decisions, it is reasonable to consider the following risk factors for recurrence: lobar location of the initial ICH, older age, ongoing anticoagulation, presence of the apolipoprotein ε2 or ε4 alleles, and greater number of microbleeds on MRI
    • After the acute ICH period, absent medical contraindications, BP should be well controlled, particularly for patients with ICH location typical of hypertensive vasculopathy
    • After the acute ICH period, a goal target of a normal BP of <140/90 (<130/80 if diabetes or chronic kidney disease) is reasonable
    • Avoidance of long-term anticoagulation as treatment for nonvalvular atrial fibrillation is probably recommended after spontaneous lobar ICH because of the relatively high risk of recurrence. Anticoagulation after nonlobar ICH and antiplatelet therapy after all ICH might be considered, particularly when there are definite indications for these agents. Avoidance of heavy alcohol use can be beneficial. There is insufficient data to recommend restrictions on use of statin agents or physical or sexual activity

    Rehabilitation and Recovery

    • Given the potentially serious nature and complex pattern of evolving disability, it is reasonable that all patients with ICH have access to multidisciplinary rehabilitation. Where possible, rehabilitation can be beneficial when begun as early as possible and continued in the community as part of a well-coordinated (seamless) program of accelerated hospital discharge and home-based resettlement to promote ongoing recovery

    Guidelines for the Management of Spontaneous Intracerebral Hemorrhage. A Guideline for Healthcare Professionals From the American Heart Association/American Stroke Association
    Stroke published online Jul 22, 2010

    Decompressive craniectomy

    Neuro-folks at LAC+USC Medical Centre describe outcomes for patients with traumatic brain injury without space-occupying haemorrhage who underwent decompressive craniectomy for intracranial hypertension refractory to maximal medical therapy. Of 43 included patients, 25.6% died (11 of 43), and 32.5% (14 of 43) remained in vegetative state or were severely disabled. Favourable outcome (Glasgow Outcome Scale 4 and 5) was observed in 41.9% (18 of 43). More evidence will result from two ongoing randomised multicentre trials: the European RescueICP study and the Australian DECRA trial.

    Decompressive craniectomy: Surgical control of traumatic intracranial hypertension may improve outcome
    Injury. 2010 Jul;41(7):934-8

    UK Capacity Assessment Mnemonic

    GPs Drs Hoghton & Chadwick have produced a bioethical mnemonic ‘CURB BADLIP’, for all healthcare professionals in England, Scotland, and Wales for use in patients aged 18 or over in an emergency:

    C—communicate. Can the person communicate his or her decision?
    U—understand. Can the person understand the information being given?
    R—retain. Can the person retain the information given?
    B—balance. Can the person balance, or use, the information?
    B—best interest. If there is no capacity can you make a best interest decision?
    AD—advanced decision. Is there an advanced decision to refuse treatment?
    L—lasting power of attorney. Has lasting power of attorney been appointed?
    I—independent mental capacity advocate. Is the person without anyone who can be consulted about best interest? In an emergency involve an independent mental capacity advocate
    P—proxy. Are there any unresolved conflicts? Consider involving the local ethics committee or the court of protection appointed deputy.

    Assessing patient capacity: Remember CURB BADLIP in the UK
    BMJ 2010 340: c1285

    Delirium guidelines

    The UK’s National Institute for Health and Clinical Excellence (NICE) has produced guidelines on delirium.
    Delirium (sometimes called ‘acute confusional state’) is a common clinical syndrome characterised by disturbed consciousness, cognitive function or perception, which has an acute onset and fluctuating course.
    Some snippets from the guideline include:

    • If indicators of delirium are identified, carry out a clinical assessment based on the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria or short Confusion Assessment Method (short CAM) to confirm the diagnosis.
    • In critical care or in the recovery room after surgery, CAM-ICU should be used. A healthcare professional who is trained and competent in the diagnosis of delirium should carry out the assessment.
    • If there is difficulty distinguishing between the diagnoses of delirium, dementia or delirium superimposed on dementia, treat for delirium first.
    • If a person with delirium is distressed or considered a risk to themselves or others and verbal and non-verbal de-escalation techniques are ineffective or inappropriate, consider giving short- term (usually for 1 week or less) haloperidol or olanzapine.

    The CAM-ICU assessment tool is demonstrated in the video below, which is found along with other helpful delirium resources at http://www.icudelirium.co.uk

    NICE Guidance: Delirium: diagnosis, prevention and management