Introduction to Paramedic Practice - Week 1 + 2 (Cardiac arrest, communication, vital signs + Primary survey and infection control) Flashcards

(97 cards)

1
Q

WEEK 1 - Cardiac arrest, communication and vital signs

Resus theory - What is a cardiac arrest?

A

The cessation of effective cardiac output (Which is the amount of blood pumped around the body every minute). This means the patient’s heart has stopped, and is clinically ‘dead’.

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2
Q

Cardiac arrest - NOTES (resus theory)

  • A patient without a heart beat does not move blood and oxygen around the body
  • This means tissues become hypoxic and begin to die
  • The longer tissues go without oxygen the more cells will die
  • The longer it takes to restart a heart the worse the patients prognosis will be
A
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3
Q

Resus Theory- What signs might indicate a cardiac arrest?

A
  • Bystanders doing CPR
  • A pale or grey patient
  • Central cyanosis (bluish colour due to lack of oxygen)
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4
Q

Resus Theory - What does the ‘Thoracic pump theory’ describe?

A
  • When you do CPR you aim to compress the chest by a third with every compression
  • If you decrease the volume of the chest cavity you increase the pressure.
  • That means the pressure on the heart increases forcing blood out the heart into circulation.
  • Your circulatory system only flows one way – that how its built and you’ll cover it in human body systems
  • When you release the compression the pressure returns to normal but now there is no blood filling the heart- so blood is drawn into the heart to fill the space: ready for the next compression.
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5
Q

Resus Theory - What does the ‘Cardiac pump theory’ refer to?

A
  • The heart is located between the spine and the sternum
  • As you perform compressions you press the sternum towards the spine, consequently the heart is compressed between the two structures.
    As the heart gets compressed blood gets forced out and as you release the compression the heart refills.
  • Remember it’s a one way system.
  • Current thinking is that both mechanisms (this and thoracic pump theory) probably contribute to effective CPR
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6
Q

Resus theory - Concept - Vectors: Notes

Force is a vector: it has both a magnitude and a direction
Contrast to a scaler such as height or speed
Adding vectors: Force in the same direction
Adding vectors Force in two directions

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7
Q

Resus Theory - Application: Compressions:

A

First of all, arms straight and lock your elbows or you end up using your biceps and triceps too.

If you align your shoulders over the patient the force you apply goes directly down, into their sternum. You pivot on your hips.
As a bonus you get to add the weight of your own toros and shoulders to the compression meaning you don’t have to work as hard.

If you don’t align your shoulders above the torso, the force goes in at an angle, you don’t get the full benefit from your own body weight and you have to use more of your arm muscles to compensate. This gets tiring after a while and your compression quality starts to suffer.

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8
Q

Resus Theory: Application (compressions) Does it even matter?

CPR is mainly performed by flexion and extension through the hip joint.
If you are not positioned properly you are not able to utilize some of your major muscle groups. If your not over the patient you cant engage your pectoralis major.
If you are kneeling too far back you don’t get to use your legs or your core.
Its not that you cant still do effective compressions, you can but you will tire more quickly and all the power has to come from your arms.
It takes about 30kg of pressure to compress a chest. As you tire your compressions become ineffective.

A
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9
Q

Resus Theory: Concept: Rate of compressions

A

NZ resuscitation council recommends between 100 and 120 beats per minute. This is based on how many people survive out of hospital cardiac arrest and what rate seems to offer the best chance

We teach 110 beats per minute, right in the middle of that range. If you add one extra or skip one that gives you a little wiggle room rather than sitting on one extreme or another

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10
Q

Resus theory - What is the acceptable depth of compressions?

A

5cm, or about 1/3 of the thoracic cavity

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11
Q

Resus theory - Normal sinus rhythm: NOTES

A

Normal pathway of the electrical impulse
Originates in the Sino Atrial (SA) node
Intrinsic rate of 60-100 beats per minute
Do not defibrillate

(P wave, QRS complex, T wave)

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12
Q

Resus Theory - Cardiac arrest arrythmias: What are the four arryhthmias focussed on in 1st year paramedicine?

A
  1. Ventricular Tachycardia (VT)
  2. Ventricular Fibrillation
  3. Pulseless Electrical Activity (PEA)
  4. Asystole
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13
Q

Resus Theory - Cardiac arrest arrythmias: Ventricular tachycardia:

Shark tooth appearance
Fast heart rate (originates in the ventricles, not the atria)
Treatment; defibrillation

A
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14
Q

Resus Theory - Cardiac arrest arrythmias:
Pulseless electrical activity:

Organised electrical activity with no detectable output
Do not defibrillate – The electrical activity is already working normally even though there is no cardiac output.
Treatment: look for and treat reversible causes

A
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15
Q

Resus Theory - Cardiac arrest arrythmias:
Pulseless electrical activity:

What is the only way to differentiate a normal sinus rhythm from PEA?

A

To see if you can palpate a pulse (usually carotid or femoral). In the absence of a pulse, you know you are working with PEA over normal sinus rhythm.

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16
Q

Resus Theory - Cardiac arrest arrythmias:
Asystole:

Complete absence of electrical activity (no pulse)
Poor prognosis
Do not defibrillate – This rhythm has no electrical activity, defibrillation will have no effect
Treatment: look for and treat reversible causes

A
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17
Q

Resus Theory - What are the reversible causes of a cardiac arrest (4H’s and 4T’s)?

A
  • Toxins
  • Tension pneumothorax (air in pleural space)
  • Thrombosis (blood clot in vessel)
  • Tamponade (compression of heart due to blood/fluid in heart cavity/pericardial space)
  • Hypoxia (lack of oxygen)
  • Hypokalemia (potassium based)
  • Hypo/erthermia (temp)
  • Hypovolemia (volume of blood in circulation)
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18
Q

Resus Theory - Primary vs Secondary Arrest:

What is a primary cardiac arrest?

A

When the heart stops beating due to a mechanical or electrical failure of the heart. A heart attack or dysrhythmia causing cardiac arrest would be examples of primary cardiac arrest

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19
Q

Resus theory - Primary vs Secondary arrest:

What is a secondary cardiac arrest?

A

Any non-cardiac problem which causes the heart to cease functioning is a secondary cardiac arrest. If a person drowns or chokes or asphyxiates, they will be unable to inspire oxygen. A lack of oxygen will cause a lack of ATP which will eventually cause the heart to stop beating. Stabbings, poisonings and drownings are all examples of secondary cardiac arrest

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20
Q

Resus Theory - Primary Vs Secondary arrest:

Additional NOTES

Primary Arrest
- Cardiac Cause
- Priority is defibrillation and compressions
- Ratio of 30:2

Secondary Arrest
- Non – Cardiac Cause
- Priority is ventilations
- Look for reversable causes
- Ratio of 15:2

A
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21
Q

Resus Theory - Cardiac arrest

  • ‘Pit crew’ approach:

Use defined roles
Team leader
Airway/ breathing clinician
Chest compressions
Clear communication
Flattened hierarchy

A
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22
Q

What are the three overt signs of a cardiac arrest?

A
  • Unconscious
  • Abnormal or NO breathing
  • Absence in signs of circulation (central cyanosis or pale/grey in colour)
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23
Q

What is the average amount of blood pumped around the body per minute (at rest)?

A

5 litres a minute

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24
Q

Vital signs: Respiratory rate - What is respiratory rate?

A

The amount of times someone breathes in one minute

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Vital signs: Respiratory rate - How can a respiratory rate be measured?
By observing, palpating or listening to a patient's breathing, and counting each breath
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Vital signs: Respiratory rate - When would you prioritize taking a shorter albeit less accurate respiratory rate (i.e over the course of 15 seconds x4 rather than over the span of 1 minute)?
If the patient is extremely unwell. In this case speed may be prioritised over accuracy
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Vital signs: Respiratory rate - What is the normal healthy respiratory rate for a healthy adult patient?
12-20 breaths per minute
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Vital signs: Respiratory rate - What is a slow/fast respiratory rate called?
Slow = under 12 breaths per minute (bradypnea) Fast = over 20 breaths per minute (tachypnea)
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Vital signs: Respiratory rate - When measuring a respiratory rate, what other things should you be looking out for?
Consider the depth of respiration (deep or shallow), and the effort required to inhale and exhale)
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Vital Signs: Oxygen saturation and delivery - What is the oxygen flow rate for nasal prongs?
1-4 L per minute
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Vital Signs: Oxygen saturation and delivery - What is the oxygen flow rate for a simple oxygen mask? (also called acute or hudson mask)
6 L per minute
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Vital Signs: Oxygen saturation and delivery - What is the oxygen flow rate for a nebuliser mask?
8 L per minute
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Vital Signs: Oxygen saturation and delivery - What is the oxygen flow rate for a reservoir mask? (also may be called a non-rebreather mask)
10 L per minute
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Vital Signs: Oxygen saturation and delivery - What is the oxygen flow rate for a manual ventilation bag? (also called bag valve mask or IPPV - intermittent positive pressure ventilation
10 L per minute
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Vital signs: Oxygen What do red blood cells contain?
Haemoglobin
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Vital signs: oxygen What is haemoglobin? What does it do?
Haemoglobin is a protein found in red blood cells. Oxygen binds reversibly to haemoglobin, enabling it to be transported around the body. It also binds reversibly to carbon dioxide, to transport this gas out of the body.
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Vital signs: Oxygen How much blood does it take to dissolve: - 0.3ml of oxygen
100mls of blood
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Vital signs: Oxygen - How much oxygen can be carried in the haemoglobin of 100mls of blood?
About 20.1 mls
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Vital Signs: Oxygen - Pulse Oximetry: What is a normal Spo2 reading for most people?
94% or higher
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Vital signs: oxygen - Pulse Oximetry: What does a pulse oximetry measure?
- A pulse oximeter shines both red light and infrared light through a patients finger and detects how much light has been absorbed - This is displayed as a percentage of how many haemoglobin molecules in the blood have an oxygen bound to them This comes as oxygenated haemoglobin absorbs more infared light than deoxygenated haemoglobin, and deoxygenated haemoglobin absorbs more red light than oxygenated haemoglobin.
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Vital Signs: Oxygen - Pulse oximetry: What are the main limitations of Spo2?
- Poor perfusion may reduce the amount of blood flow to the extremities. In this case, if less blood flow (and therefore oxygen) reaches the Spo2 probe, it may give a low reading - Dark nail polish/dark pigmentation may inhibit the probes ability to detect light absorption - Carbon monoxide binds ALMOST irreversibly to haemoglobin. It absorbs similar levels of light to oxygen, resulting in an erroneous reading. - Remember all the pulse oximeter does is measure the percentage of haemoglobin with oxygen attached, SO if there are few red blood cells but all of them have an oxygen bound to them, the SpO2 will be 100% - Haemoglobin contains iron. Anaemia or low iron levels inhibit haemoglobin production. - Bleeding patients have a reduced blood volume but may have a normal SpO2 reading
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Vital Signs: Oxygen - Pulse oximetry: What does Spo2 actually stand for?**
Peripheral oxygen saturation S = saturation P = Peripheral O2 = Oxygen
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Vital Signs: Oxygen - What is cyanosis?
Blueness of the skin resulting from a deficiency of oxygen in the circulating blood... The oxygen deficiency turns the haemoglobin a reddish-violet colour, which is lightened to blue-violet as it shows through the white dermal collagen. - Cyanosis is a sign of severe hypoxia, and is most commonly seen in the lips or extremities
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Vital Signs: Oxygen - What are the four main types of hypoxia?
1. Hypoxic hypoxia (not enough oxygen is being inhaled). Caused by a decrease in inhaled oxygen An example would be a patient with an inadequate respiration rate 2. Pulmonary hypoxia (ventilation perfusion mismatch). Caused by a mismatch in ventilation (the amount of oxygen reaching the alveoli) and perfusion (the amount of blood reaching the alveoli). An example would be an embolism or blockage of blood vessels perfusing the lungs resulting in blood which was unable to reach the lungs to get reoxygenated. This might result in deoxygenated blood returning to circulation. 3. Stagnant hypoxia (oxygen is not being transported to the lungs). Occurs when there is abnormally low blood flow to the lungs. An example would be cardiac arrest where the heart muscle is unable to pump blood 4. Cellular hypoxia (oxygen can't bind to haemoglobin). Occurs when heamoglobin is not able to bind with oxygen This can occur in carbon monoxide poisoning
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Vital Signs: Oxygen - Indications: NOTES - Oxygen should usually only be administered if the patient has an SpO2 less than 92% on air, airway obstruction, or a specific indication as described within these guidelines (CPG1.16) - In some conditions such as carbon monoxide poisoning oxygen may be specifically indicated - Oxygen is administered for poor perfusion, dyspnoea or hypoxia. - A normal SpO2 does not indicate a lack of need for oxygen
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Vital Signs: Oxygen - Contraindications NOTES - There are no contraindications for oxygen - Oxygen is a drug and should only be given when needed - High flow oxygen may cause vasoconstriction particularly in smaller arteries which can impede blood flow into tissues - Hyperoxia may also enhance inflammatory processes
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Vital Signs: Oxygen What is hypercarbia?
- High levels of carbon dioxide CO2. - This can lower the Ph of the blood, causing it to become too acidic (*as it links with water creating carbonic acid)* - Normally high carbon dioxide levels cause a person to inhale. Some patients normally have a higher than usual carbon dioxide level. These patients are incentivised to inhale by oxygen levels. - Providing high flow oxygen to these patients may decrease their respiration rate.
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Vital Signs: Oxygen - Hypercarbia NOTES - Patients with Chronic Obstructive Pulmonary Disorder (COPD), morbid obesity or who are on home oxygen are at risk of developing hypercarbia when given high flow oxygen These patients normally have an SpO2 of 88-92% - Oxygen administration should be titrated to keep the patient in this range or to whatever their normal SpO2 is (if known
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Vital Signs: Oxygen - Confined Spaces NOTES Oxygen administration in a confined space increases atmospheric oxygen concentration Oxygen promotes combustion Increasing the concentration of oxygen from 21% to 24% may significantly increase the risk to staff from fire or explosion
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Vital Signs: Oxygen - What is bleomycin? How does it affect oxygen sensitivity?
Bleomycin is a chemotherapy drug. It causes lifelong sensitivity to high concentrations of oxygen High flow oxygen may cause lung damage to patients who have previously been treated with bleomycin Titrate the oxygen administered to maintain an Spo2 reading of between 88-92%
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Vital signs - Oxygen: What is the point of a nebuliser mask? What is its flow rate of oxygen per minute?
The point of a nebuliser mask is to deliver aerolised medications using oxygen to deliver them. It has a flow rate of 8 L per minute of oxygen.
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Vital Signs - Capnography: What is capnography used for?
To detect carbon dioxide which is exhaled by a patient. This can provide additional information on the depth and rate of respiration. Capnography measures a patients end tidal carbon dioxide and displays it as a graph against time (waveform) This can be used to provide real time feedback on airway and breathing interventions and can assist in diagnosing some diseases
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Vital signs - Capnography: What is a normal end tidal of carbon dioxide?
35-45mmHg (millimetres of mercury)
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Vital Signs - Capnography When is capnography recommended/mandatory?
- recommended if: A bag valve mask is used to ventilate a patient - mandatory if an endotracheal tube has been placed
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Vital Signs - Capnography What is ETCO2?
- End tital carbon dioxide - This measures the carbon dioxide that is exhaled with each breath
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Vital signs - Capnography How does a capnograph work?
Carbon dioxide absorbs infrared light. A capnograph shines an infrared light across the exhaled air. The amount of light which was absorbed will indicate the amount of carbon dioxide in the breath APPLICATION: Capnography can be measured via nasal capnography or a probe may be attached to a breathing tube
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Vital Signs: Capnography - selected waveforms (e.g on a graph see ppt)
- Respiratory baseline (should be 0) - Expiratory upstroke - Alveolar plateau - Measured ETCO2 (point at top right on graph) - Inspiratory downstroke
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Vital Signs - Capnography: Sudden loss of waveform NOTES If you are ventilating a patient and notice a sudden absence of a capnography waveform you need to check on your patient urgently This means that carbon dioxide is not reaching the sensor This may be caused by a break in the circuit between your patient and the sensor If there is no break your patient may have gone into cardiac arrest
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Vital Signs - Capnography: CPR When a person is receiving ventilation during CPR you will often see a normal looking waveform with a lower ETCO2 Low ETCO2 values can be a predictor of mortality during CPR as ETCO2 under 10mmHg after 20 minutes of CPR are associated with poor rates of survival
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Vital Signs - Capnography: ROSC NOTES A sudden increase in ETCO2 during CPR may predict a Return Of Spontaneous Circulation (ROSC) Compressions should continue until the next rhythm analysis where palpation of a pulse may confirm that ROSC has occurred
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Vital Signs - Capnography: Uses of capnogrpahy NOTES
If you are ventilating a patient and the ETCO2 is increasing, consider increasing your ventilation rate to compensate for this If an endotracheal tube or supraglottic airway has been inserted capnography can be used to confirm it has been correctly placed A sudden drop in ETCO2 and a loss of waveform may indicate poor ventilation technique when using a bag valve mask to ventilate a patient When resuscitating a patient a sudden increase in ETCO2 may indicate a return of spontaneous circulation
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Vital Signs - Heart Rate: What is considered a normal heart rate in adults?
60-100BPM
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Vital Signs - Heart Rate: What are the terms used to describe either low or high heart rate?
Tachycardia - Fast heart rate (over 100BPM) Bradycardia - Slow heart rate (under 60BPM)
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Vital signs - Heart Rate: What else should you determine when palpating a heart pulse (other than number of beats)?
The regularity. Is it regular, irregular, or regularly irregular
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Vital Signs - Capillary Refill Time (CRT): What is CRT used to measure?
A persons perfusion
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Vital Signs - Capillary Refill Time (CRT): Where is a CRT usually measured on a patient?
A finger, but this can be done on a patient's toes, forehead or sternum also
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Vital Signs - Capillary Refill Time (CRT): How do you measure a CRT?
Compress an area of tissue for about 5 seconds, until the tissue turns pale. Measure the amount of time taken for colour to return to the tissue. - NOTE: In a healthy adult this should be under two seconds. - A prolonged CRT indicates poor perfusion
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Vital Signs - Blood pressure: - Mostly intuitive, see slideshow for notes if required
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Vital Signs - Three lead ECG: NOTES: An electrocardiogram (ECG) is a graph of the electrical activity of the heart against time. This can be detected through defibrillator pads or through ECG leads (see back of flashcard)...
ECG leads can measure the electrical activity of the heart but cannot deliver a shock to the patient. ECG leads can be attached to the wrists and ankles of a patient. Alternatively they can be attached on the left and right of the thorax below the clavicle and on the left and right side of the lower abdomen. Leads must be placed either on the limbs or the thorax not a combination of the two
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Vital Signs - Three Lead ECG: What is important about the placement of ECG leads?
The combination of leads (e.g LL, RL, RA, LA) must be placed either on the limbs or on the thorax of the body; not a combination of the two. e.g the RA can be placed either on the wrist or below the clavicle on the thorax, and the LL lead can be placed either on the ankle or lower left abdomen
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Vital Signs - GCS: What does the glasgow coma scale measure?
The level of a patient's consciousness
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Vital Signs -GCS: How many components make up the GCS scale? What are they?
Three: 1. Eye opening (scored out of 4) 2. Verbal response (scored out of 5) 3. Motor skills (scored out of 6) - When recording a GCS scale, it is important to incnlude the total GCS score (out of 15), as well as the scores assigned to each component specifically.
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Vital Signs - GCS: (eye opening) What are the four possible categorical outcomes of 'eye opening' on the GCS scale? *one being the worst*
4. Spontaneous 3. To speech 2. To pain 1. None
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Vital Signs - GCS: (verbal response) What are the five possible categorical outcomes of 'best verbal response' on the GCS scale? *one being the worst*
5. Oriented 4. Confused 3. Inappropriate 2. Incomprehensible 1. None
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Vital Signs - GCS: (motor skills) What are the six possible categorical outcomes of 'motor skills' on the GCS scale? *with one being the worst*
6. Obeying 5. Localising (*person moves purposefully towards the source of pain - indicating a higher level of brain function rather than pure reflexive movement) 4. Withdrawal (*person pulls away but does not try to stop it - not as purposeful*) 3. Flexing (* in response to pain person flexes/BENDS arms, clenches fists, flexes arms and extends legs, abnormal movement indicating brain damage) 2. Extending (in response to pain, person EXTENDS arms and legs - severe brain damage*) 1. None - (*indicated deep unconsciousness or death)
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Vital Signs - Blood Glucose Level (BGL): What is the device that measures blood glucose called?
A glucometer
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Vital Signs - Blood Glucose Level (BGL): What is the range of a normal bgl reading?
between 3.5-7mmolL
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What is someone with too little BGL or too high a BGL called?
Too low - (below 3.5mmol/L = Hypoglycaemic) Too high - (above 7mmol/L) = HJyperglycaemic)
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Vital Signs - Stroke assessment: When does a stroke occur?
When blood flow to the brain has been disrupted. This can be caused by bleeding or a blockage in the blood vessels that supply the brain.
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Vital signs - Stroke assessment:
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Vital Signs - Stroke assessment: What does the FAST acronym used to summarise the stroke signs stand for?
F - Face (check patient for asymmetry or facial droop. They may have altered sensations or numbness to one side) A - Arms (Ask the patient to raise both arms and keep them elevated for 10 seconds with their eyes closed. If an arm drifts downwards, or there is a reduce in sensation or power to one side, it may be a stroke) S - Speech (The patient may have lost the ability to speak, speech may be slurred or difficult to understand. They may struggle to identify the words they want to say, or know which words but may be unable to use them) T - TIME
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Vital Signs - Pupils What is the average span of a pupil in size?
Between 2-5mm
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Vital Signs - Pupils What are small or constricted pupils called? What can cause this?
Miosis - They may be caused by bright lights, parasympathetic stimulation, some kinds of brain injury, or some medications such as opiates
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Vital Signs - Pupils What are large or dilated pupils called? What can cause this effect?
Mydriasis - They may be caused by darkness, sympathetic stimulation, some brain injuries and some medications such as anticholinergic's or methanphetamine
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Vital Signs - Pupils What can uneven pupil sizes indicate?
Severe brain injury - particularly in the presence of a head injury
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Vital Signs - Pupils What is the consensual pupillary reflex?
- When a light is shone into the eye the illuminated pupil should constrict. This is the direct pupillary reflex. - Both pupils should constrict even though only one is illuminated. The ability of both pupils to constrict in response to the illumination of only one eye is called the consensual pupillary reflex
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Vital Signs - What can a slow or 'sluggish' constriction of the pupil in resposne to light indicate?
Increased intracranial pressure + potentially brain damage, particularly in repsonse to brain trauma
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Vital Signs- Temperature NOTES: A patient with a high temperature may have an infection or hyperthermia. A patient with a low temperature may have hypothermia. In an adult patient temperature is normally measured using a tympanic thermometer. In a healthy patient a temperature should be between 36.5 and 37.5 degrees Celsius.
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COMMMUNICATION SECTION: mainly intuitive, go back to notes if need to ****
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WEEK 2: Primary Survey: What is the purpose of doing a primary survey when we first arrive to a patient?
To ascertain how sick our patient is. It allows you to quickly identify a cardiac arrest, or whether the patient is time critical. Ideally a primary survey should be completed within 90 seconds. To help us do this in complex and high-stress situations, we use a structured approach using a 'Find-It, Fix-It, Move-On' algorithm.
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Primary survey - What does the ABC stand for in the primary survey table?
Airway Breathing Circulation
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Primary survey - What is the find it, fix it, move on for airway in a primary survey?
Find it: Look, listen, jaw tone Fix it: Back blows, chest compressions, position, suction, adjuncts, head tilt, jaw thrust Move on: Patent, noiseless, self maintained, with or without supported with clinical assistance
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Primary survey - What is the find it, fix it, move on for breathing in a primary survey?
Find it: Rate, colour, Spo2 Fix it: Positioning, oxygen, ventilation Move on: Adequate volume, rate, with or without supported with clinical assistance
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Primary survey - What is the find it, fix it, move on for circulation in a primary survey?
Find it: Rate, colour, CRT, pulse strenght Fix it: Positioning, Autotransfusion Move on: Adequate perfusion and rate with or without clinical assistance
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What is the full acronym for a primary survey? What does it mean?
DRC-ABC D - Danger (check if there is any danger to the scene, and whether it is safe to proceed) R - Response (check AVPU scale for initial level of consciousness) - is patient in cardiac arrest RESUS C - Catastrophic breathing (CONTROL). Use pressure and tourniquets to stop bleeding A - Airway - Use positioning/manoeuvres, suction and airway adjuncts B - Breathing - Use masks, oxygen therapy and ventilation equipment C - Circulation - use positioning/autotransfusion (elevated legs)
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Primary Survey - Response: NOTES
- The Glasgow Coma Scale (GCS) is a means of determining a patients level of consciousness which is covered in the vital signs content. - In the primary survey we need a more rapid tool to quickly identify if a patient is conscious or unconscious. - We use the AVPU tool to make this assessment. This is faster but less comprehensive than the GCS. Using the AVPU scale a patient will fall into one of four categories: Alert: The patient is not unconscious. Their eyes open spontaneously, they may react or speak as you approach. They could be completely oriented or very confused. If they appear aware of their environment they are alert. Voice: The patient is not alert. They make no response to your approach. Their eyes do not open spontaneously. They could be asleep or unconscious. If the patient responds to your voice whether it is a normal speaking voice or a shout they are considered responsive to voice. Pain: The patient is not alert and has not responded even to a shout. The next step is the application of a painful stimulus. This is normally applied using a firm pressure to squeeze the trapezius muscle. If the patient responds to this stimulus they are considered responsive to pain Unresponsive: If the patient has not reacted at all to voice or painful stimulus they are considered unresponsive. This indicates a profoundly unconscious person.
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