DRUGS USED IN ICU - Department Of Pulmonary...
Transcript of DRUGS USED IN ICU - Department Of Pulmonary...
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DRUGS USED IN ICUDR.PARUL MRIGPURI
DEPTT OF CHEST & TB
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POLICY OF DRUG USE IN ICU
• Patients admitted to the ICU must
have a complete drug history
documented:
a) Premorbid and current medications.
b) Previous adverse drug reactions and
allergies.
c) Note potential drug interactions.
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• All drugs, infusions and fluids are
reviewed and transcribed at least
daily.
• Drugs should be prescribed
according to Unit protocols and
guidelines.
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• Where possible:
a) Use drugs that can be measured
to monitor therapeutic drug levels.
b) Avoid drugs with narrow
therapeutic indices (e.g. digoxin,
theophylline), particularly in
patients with associated hepatic or
renal dysfunction.
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c) Cease a drug if there is no apparent
benefit.
d) If two drugs are of equal efficacy,
choose the cheaper drug as the cost
of drugs in ICU is significant
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DRUGS USED
1. Cardiovascular drugs
2. Respiratory drugs
3. Sedation, analgesia & muscle
relaxants
4. Anticoagulation
5. Endocrine drugs
6. Renal drugs
7. G I drugs
8. Antibiotics
9. Fluid & Electrolytes
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CARDIOVASCULAR DRUGS
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• Inotropic Agents
• Vasopressors
• Antihypertensive & Vasodilator Agents
• Antiarrhythmic Agents
• Antiplatelet Agents
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Inotropes
a) General principles:
i) Defence of blood pressure in critically
ill patients forms the basis of
haemodynamic resuscitation and
organ perfusion
ii) Hypovolaemia is the most common
cause of hypotension and low cardiac
output in ICU
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iii) The main indications for the use of
inotropes are to increase myocardial
contractility, heart rate and/or vascular
tone.
iv) The use of inotropes requires regular
haemodynamic monitoring.
v) No single inotrope has been shown to
be superior to another.
vi) There is marked inter-individual variation
in the response to inotropes.
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CVS EFFECTS OF INOTROPIC DRUGS
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INOTROPIC DRUGS
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VASOPRESSOR AGENTS
General principles
i) Vasopressors usually act directly on
the peripheral vasculature and are
primarily used to acutely elevate blood
pressure
ii) The catecholamines have variable
effects on the peripheral vasculature.
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iii) The most common cause of
hypotension in ICU patients is
hypovolaemia.
iv) Pressor agents should not be used
as an alternative to fluid resuscitation
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Indications (In ICU)
i) Tissue infiltration with local
anaesthesia.
ii) Topically prior to nasal intubation.
iii) Hypotension following sympathetic
block (e.g. epidural anaesthesia).
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iv) Hypotension refractory to large
doses of catecholamines
(vasoplegia):
♦ Consider relative hypoadrenalism
♦ Consider use of vasopressin
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VASOPRESSORS
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Complications
i) Rebound hypertension
ii) Vagal reflex bradycardia
iii) Tachyphylaxis
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ANTIHYPERTENSIVE AGENTS
General principles
i) The most common cause of
hypertension in ICU patients is
sympathetic drive due to pain,
agitation or delirium.
ii) Patients in the recovery phase of
acute renal failure are often
hypertensive.
.
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iii) Hypertension following an
intracranial event (haemorrhagic or
ischaemic) is common and the
underlying mechanism dictates
therapy
iv) Target therapy should be titrated
against the patient’s premorbid BP.
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v) In the absence of adverse effects,
the maximal therapeutic dose of a
selected agent should be used prior to
commencing a second or third agent.
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Indications
ACUTE
♦ Acute perioperative
control of hypertension
♦ Hypertensive crisis
♦ Pre-eclampsia / eclampsia
♦ Phaeochromocytoma
♦ Untreated aneurysm or
vascular injury
CHRONIC
♦ Sustained essential
hypertension
♦ Ischaemic heart disease
♦ Cerebrovascular disease
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ANTIHYPERTENSIVE AGENTS&VASODILATORS
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ANTIHYPERTENSIVE AGENTS&VASODILATORS
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ANTIHYPERTENSIVE AGENTS&VASODILATORS
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ANTIARRYTHMIC AGENTS
General principles
i) Prior to administration of
antiarrhythmic agents, optimise
correction of the following:
♦ Hypovolaemia
♦ Metabolic abnormalities
♦ Myocardial ischaemia
♦ Sepsis
♦ Pain and agitation.
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ii) All antiarrhythmic drugs are
potentially arrhythmogenic.
iii) Virtually all depress myocardial
contractility
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Indications
i) Termination of an acute arrhythmia
ii) Prophylaxis against recurrence
iii) Rate control
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ANTIARRYTHMIC AGENTS
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ANTIARRYTHMIC AGENTS
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ANTIARRYTHMIC AGENTS
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ANTI PLATELET AGENTS
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ANTI PLATELET AGENTS(CONT.)
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RESPIRATORY DRUGS
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• BRONCHODILATORS
A. B2 AGONIST
B. METHYLXANTHINES
C. ANTICHOLINERGICS
• CORTICOSTEROIDS
INHALATIONAL
SYSTEMIC
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General Principles:
i) Treatment of bronchospasm in ICU .
ii) They are not routinely used in all
ventilated patients.
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iii) Once commenced, they must be
reviewed frequently regarding
efficacy:
♦ Audible wheeze, respiratory rate
♦ Subjective and objective work of
breathing
♦ Lung compliance
♦ Blood gases.
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Indications:
i) Pre-existing asthma / chronic
obstructive pulmonary disease
(COPD)
ii) Acute severe asthma or exacerbation
of COPD
iii) Bronchospasm 2° to infection,
aspiration or during mechanical
ventilation,
iv) For the treatment of hyperkalaemia
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ROUTES OF ADMINISTRATION
• INHALATION
MDI
NEBULIZED
CONTINOUS NEBULIZED
• SUBCUTANEOUS
• PER ORAL
• INTRAVENOUS
• I/V INFUSIONS
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B-2 agonist & Anticholinergics
The frequency of intermittent B² agonist administration vary with
the severity of illness of the patient; in severely ill patients, the
initial interval may be hourly
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Mucolytic agents
• N – Acetyl cystiene
• Dornase (recombinant )
• SSKI (Saturated solution of
potassium iodide )
• Guaifenesin
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Continous nebulization
The following guidelines are used for 1
hour of nebulization. For prescribed
dose of 10 mg/h at 15 L/min flow, add
2 mL salbutamol (5 mg/mL) to 48 mL
saline for 50 mL/h output. For multiple
hours of operation, multiply by the
number of hours desired.
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INHALED CORTICOSTEROIDS
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Subcutaneous Agents
• Epinepherine
• Terbutaline
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Parenteral therapy
Indications:
i) Adjunctive therapy for patients with
acute severe asthma or COPD not
responding to nebulised agents
ii) Selected patients who are difficult to
wean from ventilation
(due to COPD)
iii) Maintenance therapy in patients with
COPD
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BRONCHODILATORS
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METHYLXANTHINES
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METHYLXANTHINES
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Corticosteroids
• Methylprednisolone
• Hydrocortisone
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Complications
i) Hypokalaemia, metabolic alkalosis
ii) Arrhythmias - β2-agonists,
theophylline
iii) Intercurrent infection - steroids
iv) Polyneuropathy - steroids
v) Increased lactate - β2-agonists
vi) Metabolic acidosis - β2-agonists
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SEDATION ,ANALGESIA &
MUSCLE RELAXANTS
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Predisposing Conditions
Underlying Medical
Condition
Acute Medical/Surgical
Condition
Mechanical Ventilation
Invasive Procedures
Medications
INTERVENTIONS
Agitation
(anxiety, pain, delirium)
ICU
Environmental
Influences
MEDICATIONS
Sedatives, Analgesics
Antipsychotic
Management of predisposing
& Causative Conditions
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Drugs used in treatment of Pain
• Treatment of perceived & prevention of anticipated pain
• Opiates – principal agents in ICU
- potent / lack of ceiling effects
- mild anxiolytic & sedative
- improved patient – ventilator synchrony
- effective antagonist - naloxone
• Lack amnesic effects /additional sedatives required
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Routes of administration
• I/V infusions / scheduled doses
• S/C when I/v route fails – infusions / bolus
• Oral, rectal, sublingual transdermal – unpredictable
• Epidural/ intrathecal routes for surgical patients
• PCA via any route - PCEA / nerve blocks/ oral/ nasogastric
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MORPHINE HYDROMORPHONE FENTAYNL
Loading dose 5-10mg 1-1.5mg 50-100 microg
Onset of action 10-20min 5-15min 1-2min
Infusion rate 1-5 mg/hr 0.2-0.5 mg/hr 50-350 microg/hr
Duration 3-3.5 hrs 2-3 hrs 30-60 mins
INTRAVENOUS OPIOD ANALGESICS
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• FENTANYL IS PREFFERED OVER
MORPHINE
Faster acting & quicker onset of
action.
No dose adjustment in RF.
Suitable in patients with
hemodynamic compromise
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AGENT CONCENTRATION
OPIODS
Fentanyl 2-5 microg/ml
Morphine 20-100 microg/ml
LOCAL ANAESTHETIC
Bupivacaine 0.06-0.125 %
Ropivacaine 0.1-0.2%
EPIDURAL ANALGESIA
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Sedation in ICU
• In the agitated, ventilated & for procedure discomfort
• To avoid self extubation & removal of catheters
• NM blockade mandates analgesia & sedation
• Control of pain before sedation
• All have side effects – dose dependent
•
• Analgesics are not sedatives/ Sedatives are not analgesics
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SCCM RECOMMENDATIONS
• Midazolam or Propofol are the
preferred agents for short term (under
24 hours) treatment of anxiety in
critically ill patients.
• Lorazepam is the preferred agent for
prolonged (over 24 hours) treatment
of anxiety in critically ill patients.
• Haloperidol is the preferred agent for
treatment of (true delirium) in critically
ill patients
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Medications for Sedation
Benzodiazepines
• Onset
– midazolam<diazepam<lorazepam
• Duration
– diazepam>lorazepam>midazolam
• Elimination
– renal failure: active metabolites accumulate for
midazolam and diazepam
– cirrhosis: prolongation of metabolism to active
metabolites for midazolam & diazepam
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Medications for Sedation
Dosing for Benzodiazepines
– Begin with 1-2 mg bolus Lorazepam
– if goal not met, give 2nd dose (1-2 x 1st dose) in 5-10 min
– if goal still not met, give 3rd dose (1-2x2nd dose) in 5-10min
– Once sedated give dosing at the level of last dose given
– If goal still not met, consider continuous infusion at 0.5-8mg/hr
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Medications for Sedation
Propofol
• Sedative hypnotic with mild amnestic properties, NO analgesia
• Rapid induction (30-40sec), rapid recovery
• Dosing:– Start dose at 5mcg/kg/min
– Titration by 5-10mcg/kg/min q5 min
• Side Effects:– Hypotension 1/3 of all patients, Bradycardia, arrhythmia, Lipemia,
hypertriglycerdemia, Pancreatitis, Infection Risk
– Propofol Infusion Syndrome: acute refractory bradycardia and metabolic acidosis, rhabdomyolysis, hyperlipidemia or an enlarged fatty liver
– Limit 2-3 days sedation therapy
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Medications for Sedation
Dexmedatomidine• Short acting alpha 2 agonist(8-10x increased binding
than clonidine)
• Anxiolytic, anesthetic, hypnotic and analgesic
• Rapid onset: 6 min Elimination: 2 hours
• Pts can be arousable/alert with stimulation
• Sedation with less lethargy
• Dose:
loading infusion for 1mg/kg for 10 min
maintenance of 0.2 to 0.7 mcg/kg/hr
• Side effects:
– Hypotension
– Bradycardia
– High doses can have alpha 1 agonist effect
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Daily Wake-Ups
• Allows patients to “wake up” by stopping drug infusion
– Clinicians are able to assess neurological status &
examine patient while awake (calm or agitated)
– Sedative doses are subsequently decreased
• Daily interruption of sedative drug infusions result in:
– Decrease duration of mechanical ventilation
– Decrease length of ICU stay
– Less nosocomial infections/VAP
– Improves hemodynamics/allows weaning of
vasopressos and fluidsKress JB et al NEJM 2006;1471-1477
Sessler CN. CCM 2004; 1413-1414.
Schweickert WD et al CCM 2004; 1272-1276
Kollef M et al Chest 1998; 541-548
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