Pharmacology - CNS, GI/Genitourinary, Infection, Pain, Toxicology Flashcards
Types of medications that affect CNS
1) anti-convulsants vs anti-seizures
2) Anti-parkinsons - usually for motor and neural discombobulation
3) Clot busters and thrombolytics for CVAs and TIAs
4) Behavioural meds for Anti-anxiety, neurolytics, and mood disorders
5) Opioids - usually considered analgesia but also greatly depresses CNS pathway (including HR and RR)
6) Anti-histamines
What are the 3 main neurological conditions encountered in pre-hospital settings requiring medications?
1) seizures
2) CVAs & TIAs
3) Mental illness
Two things neurological meds do
excite or suppress the CNS (uppers or downers)
Prime seizure disorder
epilepsy - idiopathic etiology
True or False. ABIs/TBIs can lead to seizures
True
True or false. If epilepsy disorders are not from an organic disorder (like febrile seizures, TBI) these can be corrected.
True
What is a seizure and how will the patient present?
- result of chaotic abnormal high frequent firing of neurons which can cause an altered LOC
- neurons are rapid firing with no organization, no rhythm to body
- patient is unconscious, no lash reflex
- eyes will deviate up to the left/right (to the side of the seizure in the brain)
Time frame for seizures
few seconds to 30 seconds, no more than 2 minutes
if > 2 min, high chance of brain cell death & severe cognitive impairment
True or false. Anti-Epiletic drugs will stop a convulsion once its started
False
Status epilepticus
ongoing and prolonged; starts and doesn’t stop OR continuous intermittent seizures (back to back i.e. one rolling right into the other)
True or False. Seizures typically resolve without treatment
True
What are pseudoseizures and what may a patient present like?
- by scientific definition - a psychiatric disorder brought on by stress or mental illness; a factitious disorder
- aka “fake seizures” - convulsing only, no organic brain involvement
- protected reflexes are still intact (i.e. lash reflex), can follow commands, hear. protect self, etc.
- cannot alter homeostatic balance
- roll eyes up/down or stare off into space
Pseudoseizures are now more commonly replaced with what term?
non-epileptic seizures
Pseudoseizures happen more commonly in what population
adolescence to early 20’s - more often in women
Epilepsy is most commonly diagnosed when?
before onset of puberty (usually in childhood)
Epilepsy
recurring seizures due to a brain disorder (organic brain dysruption)
Why do febrile seizures occur and what would be the appropriate treatment?
Usually triggered by fever/when kid gets too hot, the body is trying rid of excess heat but if the body cannot handle it, it will cause seizures to generate energy and give off this excess heat
Treatment: tylenol (anti-pyretic), remove clothes
Primary vs secondary seizures
Primary (idiopathic): undetermined cause - dx at a young age, accounts for ~50% of epilepsy cases
Secondary (symptomatic): distinct cause is identified
- trauma (sports, etc.); infection (sepsis); cerebraovascular disorders (TBIs, strokes, pregnancy); withdrawal (alcohol)
What are convulsions?
involuntary spasmodic contractions of any or all muscles through the body, including skeletal, facial, and ocular muscles
Is epilepsy the same thing as convulsions?
no. epilepsy is a chronic, recurrent pattern of seizures and a symptom of epilepsy would be convulsions
What are some common causes of seizures?
- TBIs/ABIs
- Epilepsy
- high fevers
- Anoxia (BP dropping so significantly due to lack of blood to the brain)
- Medicines,
- certain diseases
- alcohol/drug withdrawal
- trauma
- infection
- cerebrovascular disorders
What are the 3 main types of seizures?
Focal - aka partial onset seizures
generalized
unknown
Describe the different categories of focal seizures.
1) Simple partial - aka petite mal/focal aware seizure: these patients are aware during the seizure and the seizure is happening in one small part of the brain
2) Complex partial - aka focal impaired awareness seizure: these patients are confused or their awareness is affected in some way during a focal seizure
3) Secondary generalized tonic-clonic: a seizure that starts in one area of the brain, then spreads to both sides of the brain as a tonic-clonic seizure
Describe what a focal seizure is and its clinical presentation
- abnormal electrical activity that occurs in one or more parts of one brain hemisphere; partial seizure
- It begins in one area (“focal”) and may progress to others, leading to a general seizure (bilateral tonic-clonic)
- they are aware or have impaired awareness
- can have motor or non-motor onset
- eyes will deviate to the side of the brain where the seizure is occurring
Describe the clinical presentation of a patient with generalized seizures.
- previously known as grand mal seizures
- seizure that affects both sides of the brain
- usually motor (tonic- clonic or other motor) OR non motor (absence seizures - eyes may be oscillating)
- involves the whole body
What is an unknown onset seizure?
unclassified/idiopathic, can be focal or generalized and motor or non-motor
Describe the clinical presentation of an absence seizure.
- generalized onset seizure that is non-motor
- brief abnormal electrical activity in a person’s brain (very short lasting, several seconds)
- they look like they’re staring off into space/blanking
- lack of awareness during period of seizure
Benzodiazepines are considered what type of medication?
anti-convulsant meds & CNS depressant
What are the two main benzodiazepines and how do they work?
- Diazepam (Valium)
- Lorazepam (Ativan)
How it works: binds with gamma-aminobutyric acid (GABA) in the CNS which increases its natural effect and resultant decrease in activity in the CNS
- affects hypothalamic, thalamic, and limbic systems of the brain
- does not supress REM sleep as much as barbituates do
- does not increase metabolism of other drugs
*these actually STOP the convulsions hence anti-convulsants
The most common form of benzodiazepines used in prehospital setting?
Versed (Midazolam)
Anti-seizure medications are known as
anti-epileptic drugs (AEDs)
Goal of anti-epileptic drugs
- to control or prevent seizures while maintaining reasonable quality of life
- elongates time between seizures, and dramatically reduces the time frame of seizure if you do have a seizure
- minimizes adverse effects and drug-induced toxicity
- usually life-long, and a combination of drugs may be used
A patient goes to his doc and reports that his initial anti-epileptic drugs are no longer working even though they have worked for him in the last 5 years. What would be the doc’s next appropriate step?
To consider potential changes in the patient’s lifestyle which can affect how well they respond to their meds. If the AED was initially working and now isn’t, patient should be switched to a new AED
List 9 anti-seizure meds/AEDs.
1) Carbamazepine (Carbatrol, Tegretol)
2) Phenytoin (Dilantin)
3) Valproic acid (Depakene)
4) Oxcarbazepine (Trileptal)
5) Lamotrigine (Lamictal)
6) Gabapentin (Neurontin)
7) Topiramate (Topamax)
8) Phenobarbital
9) primidone (Mysoline)
What AED can be prescribed to someone who does not have epilepsy? What else could this drug be used for?
Gabapentin - helps with neurons so peripheral vascular disease, neuropathic pain, shaking, diabetes, restless leg syndrome, anxiety/sleeping
Patients who are phenobarbital usually have what diagnosis?
schizophrenia or hx of psychosis
Upon assessing the current medication list of a patient. The drug Gabapentin (Neurontin) is listed, but the patient states that he does not have any problems with seizures. You suspect that the patient:
- Is unaware of his own disease history
- Has been taking his wife’s medication by mistake
- May be taking this drug for neuropathic pain
- Is reluctant to admit to having a seizure disorder
c) May be taking this drug for neuropathic pain
Parkinsons Disease - What is it, symptoms, prevalence
- progressive nervous system disorder that affects movement
- symptoms start gradually (i.e. barely noticeable tremor in one hand)
- onset around 40s but most common in aged (prevalence increases with age)
- tremors are common but disorder also commonly causes stiffness or slowing of movement
Parkinson Disease medication - what is it and how does it work?
- carbidopa-levodopa (Sinemet)
- most effective parkinsons disease
- a natural chemical that passes into the brain and then gets converted to dopamine (as Parkinsons is thought to be due to lack of dopamine)
What are the two types of strokes?
CVAs and TIAs
Cerebrovascular accidents (CVAs)
- occurs when blood supply to the brain is interrupted/reduced, which deprives oxygen and nutrients from the brain leading to brain cell death
- can be caused by blocked artery (ischemic stroke) or leaking/bursting of a blood vessel (hemorrhagic stroke)
- aneurysms rupturing can also cause stroke
- plaque build up (clot or ischemia)
- main risk factor: HTN and high cholesterol
Transient Ischemic Attacks (TIAs)
- similar to a stroke but usually lasting only a few minutes and causes no permanent damage
- it’s the body’s way of alerting you that more problems are coming (CVA) - warning system with no time frame (i.e. a stroke may occur right after a TIA or in 2 years)
____% of strokes are ischemic.
____% of strokes are hemorrhagic.
80% are ischemic strokes - high % of survival
20% are hemorrhagic
What is the 80/20 rule for hemorrhagic strokes?
of the 20% that are hemorrhagic strokes, 80% are fatal and 20% will survive
What is the one clinical presentation that may help you distinguish between hemorrhagic and ischemic stroke?
seizures - occur in hemorrhagic strokes
An elderly patient presents with headache, blurry vision, and a SBP of 210. What are potential concerns re: this clinical presentation?
risk of stroke
Medications used for CVA/TIAs (classifications and common meds)
1) Anticoagulants: drugs that help keep the blood from clotting easily by interfering with blood clotting process
- Warfarin (Coumadin): preventative medication to prevent blood clots from forming or prevent existing clots from getting larger (prescribed following a stroke)
- ASA - low dose, daily
2) Antiplatelets: drugs that make it more difficult for platelets in your blood to stick together
- Clopidogrel (Plavix) to prevent blood clots; common taken with ASA
- exclusive for ischemic strokes/MIs because you’d be making a hemorrhagic stroke worse if you give them Plavix
3) Tissue Plasminogen Activator (tPA): thrombolytic - the only stroke medication that breaks up a blood clot & common emergency tx during a stroke; given IV/into an artery
- not for everyone; those with high risk of bleeding into their brain are not given tPA (or else they will continue to bleed into the injury site)
What are three main emotional and mental disorders?
1) anxiety
2) affective disorders
3) psychoses
Behavioural medications are given to what three categories of mental illness?
1) anxiety and depression
2) psychosis and mood disorders
3) Palliative MH - those with true MH issues
Anxiety vs Depression
Depression: Major Depressive Disorder (MDD) - common and serious medical illness that negatively affects how you feel, the way you think, and how you act
- causes feelings of sadness and/or loss of interest activities once enjoyed
Anxiety: unpleasant state of mind characterized by sense of dread and fear
- may be based on actual anticipated or past experiences
- may be exaggerated responses to imaginary negative situations
*Anxiety and depression go hand in hand - highly likelihood that if they’re dx with one, they have the other too
What are the 6 major anxiety disorders?
- OCD
- PTSD
- GAD
- Panic Disorder
- Social Phobia (social anxiety disorder)
- Simple phobia
What are affective disorders (mood disorders)?
- MH disorders characterized by changes in mood ranging from mania (abnormally pronounced emotions) to depression (abnormally reduced emotions)
- some patients may exhibit both mania and depression such as BPD
Descibe what bipolar disorder is and signs and symptoms.
- brain condition with symptoms including shifts in mood, energy level and activity
- serious disorder that causes individual to struggle with everyday life activities and can affect every area of life
- characterized by EXTREME depression and manic that is of gradual onset swinging from one to the other extreme (episodes are months long)
-
S/S:
- Mania: extremely high energy; grandiose levels of self-esteem; loud, rapid speech; very little need for sleep; engaging in risk behaviours like unprotected sex
- Depression: feelings of lethargy (both physically and mentally); sense of personal worthlessness; eating too much/too little; overwhelming sadness; suicidal/homicidal thoughts
Descibe what schizophrenia is and signs and symptoms
- A serious mental disorder in which people interpret reality abnormally
- may result in some combination of hallucinations, delusions, and extremely disordered thinking and behavior that impairs daily functioning and can be disabling
- to be diagnosed, one must experience at least two of the following S/S for 6 months including one of the first three:
- delusions, hallucinations, disorganized speech
- catatonic behaviour, negative symptoms (lessened emotional expression)
- lifelong tx required
Risk of developing schizophrenia is linked to the use of what drug while brain is developing?
smoking weeeeed
Describe what psychosis is and signs and symptoms
- severe emotional disorder that impairs the mental function of the affected individual to the point of that individual not being able to participates in ADLs
- can be from schizophrenia, depressive, sleep deprivation, and drug-induced psychosis
- Hallmark sign: loss of contact with reality
- Other S/S: hallucinations, delusions, agitation, disorganized thought and behaviour
List 6 different behavioural medications use for MH.
- CNS depressants/hypnotics
- SNRIs*
- SSRIs*
- TCAs**
- MAOI**
- Anti-psychotics
*SNRIs and SSRIS - low risk of OD
**TCAs and MAOIs - high risk of harm with misuse
CNS Depressant medications: Sedatives vs. hypnotics
Sedatives: drugs that have an inhibitory effect on CNS to the degree of reducing nervousness, excitability, and irritability (i.e. benzodiazepines)
- can become a hypnotic if given in a large enough amount
Hypnotics: cause sleep; have a much more potent effect on CNS than sedatives
What are the 3 types of CNS depressants?
1) Barbituates - will cause death in OD
2) Benzodiazepines - rarely causes death in OD
3) Miscellaneous
*mixing benzos with barbituates will cause death
What are barbiturates?
- first introduced in 190, previously were the standard drugs for insomnia and sedation
- habit forming and low therapeutic index - i.e. low dose will work for a short period of time (dependence) - leads to toxicological response (poisoning will lead to CV collapse)
- only a handful commonly used today due to safety issues and efficacy of benzoes
Indications for barbiturates
- sedative
- anticonvulsants
- anesthesia for surgical procedures
What are the four categories of barbituates?
1) Ultra short-acting: anesthesia for short surgical procedures, other uses
2) Short-acting: sedation and control of convulsive conditions
3) Intermediate-acting: sedation and control of convulsive conditions
4) Long-acting: sleep induction, epileptic seizure prophylaxis
Common Barbiturates
- pentobarbital (Nembutol)
- phenobarbital
Effects of barbiturates
- low doses: sedative effects
- can be therapeutic
- high dose: hypnotic effects (also lower RR)
Adverse effects of barbiturates
- notorious enzyme inducers (stimulates liver enzymes that cause metabolism or breakdown of many drugs)
- anesthesia induction
- uncontrollable seizures - phenobarbital coma
- OD can lead to resp depression and then resp arrest
- produces CNS depression (seizure, coma, death)
Barbiturates have a low therapeutic index. This means:
- Low doses are not therapeutic
- The toxic range is narrow
- They are habit forming
- The effective, safe dosage range is narrow.
d. The effective, safe dosage range is narrow.
Benzodiazepines can be classified as either:
1) Sedative-hypnotic
2) Anxiolytic (medication that relieves anxiety)
Benzodiazepines - list long, immediate, and short acting
Long acting: Diazepam (Valium); clonazepam (Klonopin)
Intermediate-acting: Alprazolam (Xanax), lorazepam (Ativan), Temazepam (Restoril)
Short Acting: Midazolam (Versed), Triazolam (Halcion)
Effects and Adverse Effects of benzodiazepines
Effects:
- Calming effect on the CNS
- Useful in controlling agitation and anxiety
- Reduce excessive sensory stimulation, inducing sleep
- Induce skeletal muscle relaxation
Adverse Effects:
- Benzodiazepine’s adverse effects are an overexpression of their therapeutic effects
- Decreased CNS activity, sedation
- cognitive impairment
- Hypotension
- Drowsiness, loss of coordination, dizziness, vertigo, headaches
- Nausea, vomiting, dry mouth, constipation
- fall hazard for elderly persons
- “hangover” effect/daytime sleepiness
- others
Overdose of Benzodiazepines presents as
- Somnolence (sleepiness, lethargy)
- Confusion
- Coma (esp. benzos with alcohol)
- Diminished reflexes
- Do not cause hypotension and respiratory depression unless taken with other CNS depressants
- dangerous when taken with other sedatives or alcohol
What drug can be used to reverse benzodiazepine effects (treatment for withdrawal and dependence)?
Flumazenil - benzodiazepine antagonist, it competitively inhibits the benzodiazepine binding site on GABA
When providing education to the patient on the use of a benzodiazepine medication, the paramedic will include with information:
- These medications have little effect on the normal sleep cycle.
- Using this medication my cause drowsiness the next day
- It is safe to drive while taking this medication.
- These drugs are safe to use with alcohol
B. Using this medication my cause drowsiness the next day
Antidepressant categories
- TCAs - tricyclic antidepressants
- MAOIs - monoamine oxidase inhibitors
-
Second generation antidepressants:
- SSRIs
- SNRIs
Tricyclic antidepressants (TCAs)
- introduced in 1950s, one of the first antidepressants & still considered effective for treating depression (i.e. now considered second line, replaced with SSRIs)
- low therapeutic index (meaning a small amount past therapeutic dose can cause harm/OD)
- rough side effects, usually hard to tolerate
- good choice for some whose depression is resistant to other drugs (so clinicians usually only prescribe TCAs after other drugs have failed to relieve depression)
Indications for TCAs
- depression
- childhood enuresis - bed wetting (imipramine)
- OCD (clomiopramine)
- adjunctive analgesics fro chronic pain conditions such as trigeminal neuralgia (nerve pain from trigeminal nerve)
Effects and Adverse effects of TCAs
- Effects: helps keep more serotonin and NE available to your brain
-
Adverse effects: sedation, impotence, orthostatic hypotension, others
- in older patients: dizziness, postural hypotension, constipation, delayed micturition, edema, muscle tremors
OD on TCAs
- Lethal - 70% to 80% die before reaching the hospital
- CNS and cardiovascular systems are mainly affected
- Death results from seizures or dysrhythmias
Most common TCA is
amitryptyline
Common TCAs
- Amitriptyline (Elavil)
- Amoxapine
- Doxepin
- Imipramine (Tofranil) – for urinary incontinence as well (so they ma ybe on this as well)
- Nortiptyline (Pamelor)
What are Monoamine Oxidase Inhibitors (MAOIs)?
- first type of antidepressant developed
- effective but generally been replaced by antidepressants (because they are safer and cause less side effects)
- cannot be taken with certain meds and foods
- requires diet restrictions as they can cause dangerously high BP when taken with certain foods and meds
Effects of MAOIs
- changes in brain chemistry that are operational in depression
- an enzyme called monoamine oxidase is involved in removing the NTs norepinephrine, serotonin, and dopamine from the brain; MAOIs PREVENT this from happening which makes more of these brain chemicals available to affect changes in both cells and circuits that have been impacted by depression
Adverse Effects of MAOIs
few adverse effects
- orthostatic hypotension (most common)
- tachycardia
- dizziness
- insomnia
- anorexia
- blurred vision
- palpitations
List 4 MAOIs
- Isocarboxazid (Marplan)
- Phenelzine (Nardil)
- Selegiline (Emsam)
- Tranylcypromine (Parnate)
Describe clinical presentation of OD on MAOIs
- Signs of MAOI toxicity are non-specific
- Mild signs: agitation, diaphoresis, tachycardia, mild temp elevation
- Signs of moderate disease: altered mental stasus, tachypnea, vomiting, dysrhythmias, hyperthermia, HTN
- Seizure coma death
How do antipsychotic medications work?
- reduce/relieve symptoms of psychosis (delusions, hallucinations)
- main class of drugs used to treat people with schizophrenia (& for treating serious mental illness, behavioural problems or psychotic disorders)
- have been known as tranquilizers or neuroleptics
How they work:
- block dopamine receptors in the brain (limbic system, basal ganglia); areas associated with emotion, cognitive function, and motor function
- dopamine levels in the CNS are decreased with the result of tranquilizing effect in psychotic patients
Adverse effects of antipsychotic medications
- weight gain
- insomnia
- seizures
- hypotension
- dystonia (involuntary muscle movement)
Common antipsychotic medications (9)
considered atypical antipsychotics (new class) - have fewer side effects than typical antipsychotics (first gen antipsychotics)
- Abilify (aripiprazole)
- Clozaril (clozapine)
- Geodon (ziprasidone)
- Latuda (lurasidone)
- Risperdal (Risperidone)* #1
- Saphris (asenapine)
- Seroquel (Quetiapine)
- Zyprexa (olanzapine)
- Invega (paliperidone)
Clinical presentation of OD on anti-psychotics
- leads to unexplained death and cardiac toxicity
- ECG abnormalities
- QT Elongation (will end up with cardiac standstill)
- neuroleptic malignant syndrome (showing S/S of OD + fever - psychosis mixed with fevers, considered a medical emergency)
How do SSRIs work?
- Selective Serotonin Re-Uptake Inhibitor
- those who are depressed may have serotonin imbalances/dysfunction
- SSRI allows for more available serotonin by blocking reuptake, so more serotonin builds up between neurons (in the synapse) so that messages can be sent correctly
- called “selective” serotonin reuptake inhibitors because they specifically target serotonin
Common SSRIs
- Citalopram (Celexa) - 10 mg to start off, usually the first dx prescription (may also be prescribed for situational depression)
- Escitalopram (Lexapro)
- Fluoxetine (Prozac)
- Paroxetine (Paxil, Pexeva)
- Sertraline (Zoloft)
- Fluvoxamine (Luvox)
What are SNRIs and how do they work?
- group of meds that may be used in the treatment of depression, anxiety, panic disorder, and some other mood disorders
- usually prescribed if SSRis don’t work
How they work: blocks/delays the re-uptake of 5HT or NE (which are two NTs that are typically released at presynaptic nerves) ⇒ allows for build up of these in the synapse and tends to elevate mood
Common SNRIs
- Desvenlafaxine (Pristiq)
- Duloxetine (Cymbalta) also approved to treat anxiety and certain types of chronic pain
- Venlafaxine (Effexor XR)- Also approved to treat anxiety and panic disorder
Adverse effects of SNRIs
- Sedation
- Impotence
- Orthostatic hypotension
- In older patients: Dizziness, postural hypotension, constipation, delayed micturition edema, muscle tremors
Overdose of SNRIs/SSRIs
SHIVERS acronym: for serotonin syndrome
- Shivering
- Hyperreflexia and Myoclonus: spasmodic jerky contraction of muscles, especially notable in lower extremities
- Increased Temperature:
- Vital Sign Abnormalities: tachycardia, tachypnea, labile BP
- Encephalopathy: mental status changes (agitation, delirium, confusion)
- Restlessness: common due to excess 5HT activity
- Sweating: autonomic response to excess 5HT
- statistically will not lead to death from OD unless +++ doses)
Indications for second generation anti-depressants (SSRIs, SNRIs)
- depression
- bipolar disorder
- obesity
- eating disorders
- OCD
Common miscellaneous second generation anti-depressants
- trazodone (Desyrel, Oleptro)
- bupropion (Wellbutrin)
- nefazodone (Serzone)
- mirtazapine (Remeron)
thiothixene
what class of drug and brand name?
Navane; antipsychotic
Haloperidol
what class of drug and brand name?
Haldol; antipsychotic
Molindone
what class of drug and brand name?
Moban; antipsychotic
Loxapine
What class of drug and brand name?
Loxitane; antipsychotic
What are the two natural meds used for psychological treatment? What are they used for specfically?
1) St. John’s Wort
- used for depression, anxiety, sleep disorders, nervousness
- May cause GI upset, fatigue, dizziness, confusion, dry mouth, photosensitivity
- Severe interactions if taken with MAOIs and SSRIs; many other drug interactions
2) Ginseng
- 3 varieties; has been used for 5000+ years
- stress reduction, improvement in physical endurance and concentration
- may cause elevated BP, chest pain, palpitations, anxiety, insomnia, headache, GI symptoms
- significant toxicity if taken with anticoagulants, immunosuppressants, anticonvulsants and anti-diabetic drugs
What are benzodiazepines?
- CNS depressant
- formerly the most commonly prescribed sedative-hypnotic drugs
- nonbenzodiazepins current more frequently prescribed
- favourable drug effect profiles, efficacy, and safety
Indications for benzodiazepines
- sedation
- sleep induction
- skeletal muscle relaxation
- anxiety relief
- anxiety-related depression
- tx of acute seizure disorders
- treatment of alcohol withdrawal
- agitation relief
- balanced anesthesia
- moderate/conscious sedation
What are two of the most common medications given in pre-hospital setting that affects the GI/GU tract?
benadryl and gravol
Benadryl and Gravol have the same drug components. This means that if you’re having an allergic reaction/nausea, you can take either or. True or False.
True! but this also means that these are contraindications to each other (i.e. if someone was alelrgic and cannot take Benadryl, they cannot take Gravol either)
Common medications for GI/GU system.
1) anti-emetics (anti-emesis)
2) GERD
3) Uterotonics - for females (causes uterus to contract)*
4) Tocolytics - also for uterus (causes uterus to relax)*
*usually used when pregnancy related
Is nausea an illness?
No, usually pre-or post cursor to some other underlying cause/condition
Potential causes of nausea
- neurological (head injuries) - gravol would not work on these patients
- gastroenteritis - in food poisoning patients, you don’t want to suppress the vomiting because its the body’s protective mechanism to rid of toxins
- side effects of other medications
- chest pain
- motion sickness
- fainting
- low blood sugar
- GERD - due to stomach acid coming up
True or false. N//V is a female cardiac symptom
True
Common anti-emetics
- dimenhydrinate (Gravol)
- Ondansetron (Zofran)
As per Nausea/Vomiting Medical Directive (Auxillary), what are the indications, conditions, and contraindications for use of dimenhydrinate?
Indications: Nausea or vomiting
Conditions: Dimenhydrinate - requirements of weight ≥ 25kg and unaltered LOA
Contraindications:
- allergy/sensitivity to dimenhydrinate or other antihistamines
- overdose on antihistamines or anticholinergices or tricyclic antidepressants
As per Nausea/Vomiting Medical Directive (Auxillary), what is the treatment dosage with dimenhydrinate?
- Prior to IV administration, dilute dimenhydrinate (concentration of 50mg/1ml) 1:9 with normal saline or sterile water. If administered IM do not dilute
Would you use Zofran or Gravol for a palliative elderly patient with dementia?
Zofran would be given
components of gravol can cause worsening dementia, hallucinations, depression
What conditions is gravol used for and how does it work?
- used to prevent motion sickness and N/V; radiation therapy; Ménières disease (type of vertigo that causes ringing in ears); vertigo
- Works to relieve N/V by affecting the vomiting centre in the brain (can be triggered by vagal stimulation) and the inner ear