Pals Ch 7.5 + Flashcards
What is the role of pop-off valves with a bag mask, and when does this need to be closed?
-Used so that excessive airway pressures are not used
-Need to be closed if performing CPR, since compressions will open it
What is a self inflating bag, and a flow inflating bag?
Self inflating are the ones used by EMS that will inflate by themselves
Flow inflating bags are the ones used by anesthesiologists, and inflate only with a flow of oxygen AND a good seal
What size (in mL) self inflating bags should be used with infants/children and adults?
500 mL for children
1000 mL for adults
When does the rest of the body catch up to occiput size, and a child no longer needs padding underneath their back for ventilation?
2 years
True or false: Bag mask ventilation can be used to assist a spontaneously breathing child
True
If a pt gets harder to bag, what three major etiologies should come to mind?
-PTX
-Airway obstruction
-Air stacking
Why might suctioning cause bradycardia?
Vagal stimulation
How do you measure an OPA?
Corner of the mouth to the angle of the jaw
What must be considered in children when applying an oxygen mask?
Increased agitation may worsen hypoxemia
What are the two major low flow oxygen delivery devices? High flow?
Low flow = nasal cannula, simple oxygen mask
High flow = Non-rebreather, high flow NC
What is the appropriate level of O2 flow rate for a NC?
4 L/min
What is the appropriate level of O2 flow rate for a simple face mask?
6-10 L/min
What is the appropriate level of O2 flow rate for a Non-rebreather?
10-15 L/min
What is the appropriate level of O2 flow rate for a high-flow NC?
4-40 L/min
What is the appropriate level of medication flow rate for a nebulizer? How long should they use the neb for?
-5-6 L/min
-8-10 minutes
What should be done if there are no infant sized pulse ox probes?
Attach adult sized one to hand of infant
What are the components of the DOPE mnemonic for sudden deterioration in the intubated patient?
Displacement of tube
Obstruction of tube
PTX
Equipment failure
What are the components of the SOAPME mnemonic for checklist prior to intubation?
Suction
Oxygen
Airway equipment
Pharmacologic agents
Monitoring equipment
What are the 4 monitoring devices needed prior to RSI?
-Monitor
-Pulse ox
-BP
-ETCO2
True or false: shock can be present with a normal BP
True
What is ScvO2? What are the two causes of a decrease in this number?
Venous oxygen content
-Decreased cardiac output
-Increased metabolic demand
Why can arrhythmias like heart blocks and junctional rhythms lead to decreased cardiac output?
Loss of appropriately timed atrial kick
Why are infants more dependent on HR to increased CO?
Because SV is fixed more so than in an adult
What are the three factors that determine SV?
Preload
Contractility
Afterload
Why does CVP not perfectly correlate to preload?
If right atrium has increased pressure (e.g. tPTX), then pressure will increased, but there will be no increase or even a decrease in preload
What does the body do when tissue perfusion is inadequate? How does this impair cardiogenic shock caused by increased afterload?
Constricts vessels, which will increase afterload, and worsen problem
What are two major causes of increased afterload in the child?
pHTN/HTN
Aortic stenosis
What happens to pulse pressure with hypovolemic shock?
Decreases
What defines compensated shock?
Decreased perfusion, but normal BP
What can you do to assess if an automated BP cuff is getting an accurate measurement, besides doing a manual check?
See if extremity is well perfused
What is the definition of hypotension in children 1-10- years of age (formula)?
Less than: 70+ (age *2)
What are the four major types of shock?
Obstructive
Cardiogenic
Distributive
Hypovolemic
Why is tachypnea a compensatory mechanism for blood loss?
Respiratory alkalosis to combat lactic acidosis from hypoxia
Why might SvO2 be decreased in septic shock?
-Maldistribution of blood flow
-Sepsis may cause inability to utilize O2 at cellular level
What happens to preload, contractility, and afterload with distributive shock?
-Preload = decreased
-Contractility = normal or decreased
-Afterload = variable
What happens to pulse pressure in distributive shock?
-If warm extremities = widened
-If cold extremities = narrow
What is the role of the adrenal glands in septic shock?
If infarcted or ischemic, will not produce the necessary catecholamines to maintain BP, worsening shock
What causes the decreased cardiac output with anaphylactic shock?
Increased pulmonary resistance
Neurogenic shock is caused by a loss of SNS activity at and above what spinal level?
T6
What happens with pulse pressure in neurogenic shock?
Increased
What happens to HR, afterload, and SVR with cardiogenic shock?
Tachycardia with high SVR and high afterload
How is tachypnea different in cardiogenic shock from other forms of shock?
Pulmonary edema in cardiogenic causes marked respiratory distress, while other forms/causes of shock have a “quiet” tachypnea
How can you differentiate cardiogenic shock from other forms of shock?
-S/sx of CHF
-Cyanosis
-Cool extremities
What is the role of volume resuscitation in cardiogenic shock?
Detrimental–give in small boluses of 5-10 mL/kg (about half normal amount)
What are the four major causes of obstructive shock?
-PE
-tPTX
-Cardiac tamponade
-Ductal dependent lesions
What happens to preload, contractility, and afterload with obstructive shock?
Preload = variable
Contractility = normal
Afterload = increased
What will be heard on auscultation of the heart with cardiac tamponade?
Muffled heart sounds
What is pulsus paradoxus? How do you determine this clinically?
-Decrease in SBP by more than 10 mmHg during inspiration
-Using a manual cuff, inflate the cuff. Deflate slowly, and listen for the first K sounds when child is exhaling. Note the second time when it is heard throughout the respiratory cycle. If this difference is greater than 10 mmHg, then you have it.
When do ductal dependent lesions typically present?
Within the first days to weeks of life
What are the ductal dependent heart syndromes that cause cardiogenic shock?
-Coarctation of the aorta
-Critical aortic stenosis
-Hypoplastic left heart
-Interrupted aortic arch
What are the distinguishing clinical features of cardiogenic shock from ductal dependent lesions?
-Difference in central vs peripheral pulses/BP
-3-4% higher O2 sat on right side
How can you distinguish cardiogenic shock from a PE clinically?
S/sx of right heart failure will be present
Which types of shock have labored breathing?
Cardiogenic and obstructive
Increasing tachycardia in a child = ?
Shock
What are the four main components of treating shock in a child?
-Maximize O2
-Improve cardiac output
-Reduce O2 demand
-Correct metabolic derangements
What are the three main drivers of increased O2 demand in children?
-Pain and anxiety
-Increased work of breathing
-Fever
Why should sedative agents be used cautiously in children in shock?
Will decrease endogenous stress response
What are the four major metabolic derangements in children in shock?
-Hypoglycemia
-Hypocalcemia
-Hyperkalemia
-Lactic acidosis
How does serum ionized Ca relate to pH?
Inversely
What is the relationship between K and H+ ions?
Cell will try to take up more H+, exchanging it with K+, meaning acidosis is often accompanied by hyperkalemia
What cause of acidosis is caused by HCO3 loss?
Diarrhea
When is IO access useful in shock?
Flat veins and quick need for fluids
What is the bolus amount in children, and how fast should it be given? What if cardiogenic shock?
20 mL/kg over 10-20 minutes
10 mL/kg if cardiogenic shock
What is the goal urinary output in infants, children, and adults?
Infants = 2 mL/kg/hr
Children = 1 mL/kg/hr
Adults = 0.5 mL/kg/hr
How many boluses of fluid do you give?
Reassess after each one, and titrate to response
Why get CBC with shock? (3 lab values and their significance)
-Hb = hemorrhage/hemolysis
-WBCs = sepsis
-Platelets = DIC
Why get glucose with shock? (3)
Sepsis
Adrenal insufficiency
Decreased production (liver)
Why get potassium with shock? (4)
-Renal dysfunction
-Acidosis
-Diuresis
-Adrenal insufficiency
Why get Ca with shock? (3)
-Sepsis
-transfusion/colloid hypocalcemia
-NaHCO3 use
Why get lactate with shock?
Measure and trend acidosis and treat it
Why get ABG with shock?
Determine etiology of shock (lactic acidosis, poisoning, anion gap)
Why get SvO2 with shock?
-If low, need to maximize O2 delivery
-If high, maldistribution
When should vasopressor be used in shock?
Only after several fluid boluses
Why are vasodilators helpful in cardiogenic shock?
Reduces SVR and afterload
What is Milrinone, and what is its effects?
Phosphodiesterase inhibitor
-Decreases SVR
-Improves coronary blood flow
-Improves contractility
What are the three major inotropes?
-Epi
-Dopamine
-Dobutamine
What vasodilator does not increased cardiac contractility?
Vasopressin
What may happen to a sick child with a bolus of fluids that is too much or too fast?
Pulmonary and/or peripheral edema
What can colloids cause that crystalloids cannot?
-Hypersensitivity rxns
-Coagulopathies
-Hypocalcemia (?)
What is the risk of giving fluids too fast with DKA?
Cerebral edema due to high osmolarity of blood