Flashcards in Post resus care Deck (18):
ICU or CCU transfer
The goal of post resuscitation care is to restore:
Following the period of initial post resuscitation care and stabilisation, the patient will need to be transferred to an ICU or a CCU.
The decision to transfer the patient should be made only after discussion with senior members of the admitting team.
Continue monitoring during the transfer and secure all cannulae, catheters, tubes and drains.
Ensure that portable suction apparatus, an oxygen supply and a defibrillator/monitor go with the patient.
Make a full re-assessment immediately before the patient is transferred.
Finally, complete all relevant documentation and update the patient’s family as soon as possible.
Early ECHO identifies myocardial dysfunction
ICU arterial line for BP monitoring essential
Treatment with fluids, inotropes and vasopressors
If poor response insert an intra-aortic balloon pump-pts usually tolerate fluids vwell
Consider ICD referral for pts resus out of shockable rhythm
Maintain mean arterial blood pressure
Short acting sedation (propofol, alfentanil)
import to sedate post resus
Treat with benzos/phenytoin
For myoclonus use clonazepam
Glucose 4-10 at and outside this range poor outcome
Hyperthermia post 48hrs common-antipyretics and active cooling
mild hypothermia is neuroprotective especially in coma patients
-Simple ice packs
-ice cold fluids not ideal on their own
- Cooling blankets
- Transnasal cooling
- Cardiopulmonary bypass
Consequences of hypothermia
Mild hypothermia can cause arrhythmias, hypo's (K, Na, Mg)
Shivering will increase metabolic and heat production, which will reduce cooling rates. Adequate sedation and possibly neuromuscular blocking drugs will be required.
Mild hypothermia increases systemic vascular resistance and causes arrhythmias - usually bradycardia.
Hypothermia impairs the immune system increases infection rates.
Hypothermia decreases insulin sensitivity and insulin secretion, causing hyperglycaemia, which will need treatment with insulin.
Hypothermia causes a diuresis and electrolyte abnormalities such as hypophosphataemia, hypokalaemia, hypomagnesaemia and hypocalcaemia.
Mild hypothermia impairs coagulation and increases bleeding.
The serum amylase concentration is commonly increased during hypothermia but the significance of this is unclear.
At a core temperature of 34ºC, the clearance of sedative drugs and neuromuscular blockers is reduced by up to 30%.
In adult patients who are comatose after cardiac arrest, and who have not been treated with hypothermia, and who do not have confounding factors (such as hypotension, sedatives or muscle relaxants), the absence of both pupillary light and corneal reflex at ≥ 72 hours predicts poor outcome reliably.
The post-cardiac-arrest syndrome often complicates the post-resuscitation phase.
Post cardiac arrest brain injury,
post cardiac arrest myocardial dysfunction,
the systemic ischaemia/reperfusion response
persistence of precipitating pathology.
The severity of this syndrome will vary with the duration and cause of cardiac arrest - it may not occur at all if the cardiac arrest is brief.
Post cardiac arrest brain injury manifests as coma, seizures, myoclonus, varying degrees of neurological dysfunction and brain death.
Significant myocardial dysfunction is common after cardiac arrest but typically recovers after 2-3 days.
The whole body ischaemia/reperfusion that occurs after resuscitation from cardiac arrest activates immunological and coagulation pathways that cause multiple organ failure and increase the risk of infection.
The post cardiac arrest syndrome has many features in common with sepsis, including intravascular volume depletion and vasodilation.
Any persisting pathology relating to the cause of the cardiac arrest will also need treatment.
Post cardiac arrest brain injury management
Patients who have had a brief period of cardiac arrest and have responded immediately to treatment may achieve an immediate return of normal cerebral function.
These patients do not require tracheal intubation and ventilation, but should be given oxygen by facemask to maintain normal arterial oxygen saturation.
Consider tracheal intubation, sedation, and controlled ventilation in any patient with obtunded cerebral function.
Hypoxaemia and hypercarbia both increase the likelihood of a further cardiac arrest and may contribute to secondary brain injury.
Several animal studies and some limited human data indicate that hyperoxaemia causes oxidative stress and may harm post-ischaemic neurones.
As soon as arterial blood oxygen saturation can be monitored reliably (by blood gas analysis and/or pulse oximetry), adjust the inspired oxygen concentration to maintain the arterial blood oxygen saturation in the range of 94-98%.
Adjust ventilation to achieve normocarbia and monitor this using the end-tidal CO2 with waveform capnography and arterial blood gas values.
Post cardiac arrest: Airway and breathing
Examine the patient’s chest and look for symmetrical chest movement.
Listen to ensure that the breath sounds are equal on both sides.
A tracheal tube that has been inserted too far will tend to go down the right main bronchus and fail to ventilate the left lung.
If ribs have been fractured during chest compression there may be a pneumothorax or a flail segment.
Listen for evidence of pulmonary oedema or pulmonary aspiration of gastric contents.
Insert a gastric tube - this will decompress the stomach following mouth-to-mouth or bag-mask ventilation, prevent splinting of the diaphragm, and enable drainage of gastric contents.
If the intubated patient regains consciousness soon after ROSC, and is breathing normally, consider immediate extubation. Ensure that a rigid sucker is available.
If immediate or early extubation is not possible, sedate the patient to ensure the tracheal tube is tolerated, and provide ventilatory support.
Ensure the airway is secure before transfer.
Post cardiac arrest
Cardiac rhythm and haemodynamic function are likely to be unstable following a cardiac arrest.
Look for evidence of poor cardiac function:
Record the pulse and blood pressure and assess peripheral perfusion; warm, pink digits with a rapid capillary refill usually imply adequate perfusion.
Grossly distended neck veins when the patient is semi-upright may indicate right ventricular failure, but in rare cases could indicate pericardial tamponade.
Left ventricular failure may be indicated by fine inspiratory crackles and the production of pink frothy sputum. Once in a high-care area, consider the use of a non-invasive cardiac output monitor.
Record a 12-lead ECG as soon as possible.
Acute ST- segment elevation or new left bundle branch block in a patient with a typical history of acute MI is an indication for reperfusion therapy, either with a thrombolytic or by emergency percutaneous coronary intervention.
Post cardiac arrest: Post resus neurology
Assess neurological function rapidly by recording:
the Glasgow Coma Scale score
the pupillary response to light
limb tone and posture.
11. The Glasgow Coma Scale comprises three components: eyes, verbal and motor responses.
The maximum score possible is 15; the minimum score possible is 3.
12. Obtain a comprehensive history as soon as possible.
The information may come from relatives, EMS personnel or the GP.
The patient’s baseline physiological reserve (before the cardiac arrest) is one of the most important factors taken into consideration by the ICU team when determining whether prolonged multiple organ support is appropriate.
Determine the delay before the start of resuscitation and the duration of the resuscitation; this may have prognostic significance, although is generally unreliable, and certainly should not be used alone to predict outcome
Consider other causes of cardiac arrest if there is little to suggest primary cardiac disease.
Post cardiac arrest: Continuous monitoring
Continuous monitoring is essential to detect changes during the period of instability that follows resuscitation from cardiac arrest.
These monitors should include:
blood pressure – continuous monitoring using an arterial line is preferable
14. Several investigations are indicated in the post resuscitation phase:
Arterial blood gas analysis is valuable for documenting the severity of the likely metabolic, and probably respiratory, acidosis. The effectiveness of continued resuscitation can be confirmed by documenting reducing lactate values and correction of base deficit.
A full blood count will exclude anaemia as contributor to myocardial ischaemia and provide baseline values.Check the plasma biochemistry, including blood glucose, and request a troponin.
Repeat the 12-lead ECG and request a chest X-ray.
Echocardiography is very useful because it may identify potential causes of cardiac arrest and will enable assessment of ventricular structure and function.
Post resus care
Normal cerebral function
A stable cardiac rhythm
Perfusion that is enough to maintain organ function
Good quality of life.
Post-cardiac arrest myocardial dysfunction
Post-cardiac arrest myocardial dysfunction is a component of the post cardiac arrest syndrome and causes haemodynamic instability, which manifests as hypotension, a low cardiac output and arrhythmias.
19. Early echocardiography will enable the degree of myocardial dysfunction to be quantified.
In the ICU an arterial line for continuous blood pressure monitoring is essential.
Non-invasive cardiac output monitors may help to guide treatment.
If treatment with fluid resuscitation and vasoactive drugs is insufficient to support the circulation, consider insertion of an intra-aortic balloon pump.
Aim for a mean arterial blood pressure that achieves a urine output of 1 ml per kg per hour and normal or decreasing plasma lactate values, taking into consideration the patient’s normal blood pressure, the cause of the arrest and the severity of any myocardial dysfunction
There are several strategies for optimising neurological recovery
Autoregulation of cerebral blood flow is impaired for some time after cardiac arrest, which means that cerebral perfusion varies with blood pressure instead of being linked to neuronal activity.
Following return of spontaneous circulation, maintain mean arterial pressure near the patient’s normal level.
The patient is usually sedated with a combination of opioids and hypnotics - short-acting drugs will enable earlier neurological assessment.
Adequate sedation will reduce oxygen consumption.
During hypothermia, optimal sedation can reduce or prevent shivering, which enables the target temperature to be achieved more rapidly.
Seizures occur in 10% to 40% of those who remain comatose.
Seizures increase cerebral metabolism by up to three times and may cause cerebral injury – they must be treated promptly and effectively with benzodiazepines, phenytoin, sodium valproate, propofol, or a barbiturate.
Clonazepam is the most effective drug for treating myoclonus.
There is a strong association between high blood glucose after resuscitation from cardiac arrest and poor neurological outcome. Maintain glucose in the range of 4 – 10 mmol l-1, and be very careful to avoid
Hyperthermia is associated with a worse neurological outcome and it should be avoided.
A period of mild hypothermia may improve neurological outcome.