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IP4 > Exam 2: Critical Care > Flashcards

Exam 2: Critical Care Flashcards

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1
Q

What defines hemodynamic instability in shock?

A

SBP< 90mmHg

MAP< 65 mmHg

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2
Q

What are signs of poor tissue perfusion/anaerobic metabolism?

A

Lactate > 4mmol/L

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3
Q

What characterizes shock?

A

Hypo-perfusion of tissues leading to anaerobic metabolism (impaired cellular metabolism). This will lead to inadequate tissue perfusion, cellular injury and dysfunction and ultimately multiple organ failure.

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4
Q

What happens with impaired oxygen utilization?

A

Anaerobic metabolism kicks in leading to

  1. ATP stores reduced and decreased Na/K ATPase Pump usage and decreased amplitude of action potential.
  2. Increased Na leading to hypovolemia (fluid entering cells due to higher Na levels), cellular edema and leaking lysosomal enzymes (damages the cells more)
  3. Decreased fluid in vascular system (hypovolemia) which will lead to decreased O2 delivery causing the activation of clotting cascade, ATN, ARDS, DIC.
  4. Anaerobic metabolism leads to metabolic acidosis/acidemia causing membrane disruption, enzyme disassociation and decreased O2 carrying capacity
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5
Q

Impaired Glucose Utilization

A
  1. Decreased delivery of glucose will increase cortisol, growth hormone and catecholamine release.
  2. Leads to hyperglycemia and insulin resistance.
  3. Glycogenolysis, gluconeogenesis and lipolysis cause high energy costs that contribute to cell failure.
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6
Q

What are the issues with gluconeogenesis in shock?

A

Protein is not longer available to maintain cell structure, function, repair, replication.

  1. Decreased albumin leads to reduced osmotic pressure
  2. decreased immunoglobulins = immunosuppression
  3. alanine release produces lactate
  4. byproducts of ammonia and urea
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7
Q

What happens to muscle tissue as a result of gluconeogenesis in shock?

A

Muscle wasting (diaphragm and cardiac muscle)

  1. respiratory dysfunction (decreased O2/CO2 exchange)
  2. Myocardial dysfunction (decreased glucose delivery)
  3. Decreased removal of waste products
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8
Q

What is shock driven by?

A

Reduced cardiac output, reduced systemic vascular resistance, or both

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9
Q

How do you determine blood pressure?

A

CO x SVR

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10
Q

How do you determine cardiac output?

A

SV x HR

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11
Q

What determines central venous pressure (Preload)?

A

Pressure of blood returning to the heart through the venous system

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12
Q

How do you determine mean arterial pressure (MAP)?

A

MAP = (1/3)SBP + (2/3)DBP

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13
Q

What does MAP represent?

A

Average of systolic and diastolic pressure in the arterial system, it is a surrogate marker of issue perfusion.

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14
Q

How do you calculate SVR?

A

80* (MAP-CVP)/CO

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15
Q

What does SVR represent?

A

the total resistance of the circulatory system (the amount or resistance the heart must overcome to create forward flow)

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16
Q

What are the types of shock?

A

Cardiogenic, Hypovolemic, Neurogenic, Anaphylactic (distributive), Septic (distributive), Sustained shock

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17
Q

What is the etiology of cardiogenic shock?

A

(Problem with the pump) Decompensated HF, MI, PAH, PE, valvular dysfunction, dysrhythmias, myocarditis

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18
Q

How do we treat cardiogenic shock?

A

Inotrope, vasopressor, cautious diuresis, correct underlying cause.

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19
Q

What compensatory mechanisms occur in cardiogenic shock?

A

Increases to SVR (e.g. vasoconstriction) resulting in further cardiac output.

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20
Q

How do you treat hypovolemic shock?

A
  1. Stop bleeding/fluid loss,
  2. give fluids (crystalloid or colloid
  3. Blood Products: whole blood, or packed red blood cells+ platelets + fresh frozen plasma) (if needed)
  4. Vasopressors (temporize)
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21
Q

Etiology: Neurogenic shock

A

Profound vasodilation and lack of compensatory tachycardia.

  1. too much parasympathetic activity leading to bradycardia.
  2. too little sympathetic stimulation of vascular smooth muscle leading to decreased SVR.
    3: mostly caused by SCI: C-spine, high T-spine (T1-T6)
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22
Q

How do you treat neurogenic shock?

A
  1. Fluids
  2. Vasopressors (increase vascular tone)
  3. Inotropes (treat bradycardia)
  4. Stabilize spine if SCI
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23
Q

What is the etiology of anaphylactic shock?

A

Allergy leads to an immune/inflammatory response (IgE mediated), leads to vasodilation (decreased SVR) and vascular permeability (tissue edema/hypovolemia), extra-vascular smooth muscle constriction leading to bronchoconstriction/laryngospasm

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24
Q

How do you treat anaphylactic shock?

A
  1. Remove the antigen or anti-venom (if available)
  2. Glucocorticoids, antihistamines (blunt inflammatory response)
  3. Fluid resuscitation (correct hypovolemia)
  4. Epinephrine (vasoconstriction (alpha 1 agonist), bronchodilation (Beta 2 agonist))
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25
What is the etiology of septic shock?
Bacteremia leading to endo/exo-toxins, lipopolysaccharide (LPS) gram negative, peptidoglycan and lipoteichoic acid gram positive.
26
How do you treat septic shock?
1. Remove/suppress infection (ABX) 2. Fluids 3. Vasopressors 4. Source control (I&D, remove infected heart valve, debridement/amputation) 5. Renal replacement therapy, mechanical ventilation
27
What happens if a patient sustains shock for a long period of time?
Multi-organ dysfunction syndrome (MODS): progressive dysfunction of two or more organ systems resulting from uncontrolled inflammatory response to severe illness or injury
28
What are some common triggers that can lead to MODS?
- Severe trauma - Major surgery - Burns - Shock - Pancreatitis - AKI - ARDS
29
What are the three main types of shock?
Hypovolemic, cardiogenic, distributive
30
What is hypovolemic shock?
Decreased CO due to inadequate blood or plasma volume.
31
How is hypovolemic shock presented as?
Thirst, nausea, anxiousness, weakness, light headedness, dizziness, decrease UOP. Severe: tachycardia, elevated RR, hypotension, altered mental status
32
What types of fluids are given in hypovolemic shock?
Crystalloids (NS, LR, D5W, and 3% NaCl), Colloids (Albumin), blood products
33
How is NS and LR distributed into the body?
100% ECF, | 75% into the interstitial and 25% into the intravascular space.
34
How is D5W distributed into the body?
40% ECF and 60% ICF | 75% into the interstitial and 25% into the intravascular space (break down of the ECF)
35
How is Albumin 5% distributed in the body?
100% ECF | 100% interstitial
36
How is Albumin 25% distributed in the body?
100% ECF | 500% intravascular (concentrated albumin will pull fluid into the intravascular space)
37
When would we use D5W in hypovolemia?
Dehydration with minor s/s of volume deplesion
38
When would we use 3% NS in hypovolemia?
In addition to LR/NS, for head trauma. Caution due to osmolarity, risk of cellular crenation and damage
39
Why would we use packed red blood cells in shock?
To increase oxygen carrying capacity in blood.
40
Why would we use fresh frozen plasma in shock?
To replace the clotting factors
41
Why would we use platelets in shock?
To administer for thrombocytopenia
42
How does Cardiogenic shock present?
altered mental status, pulmonary edema, hypotension, weak pulses, cool extremities, decreased urine output
43
How do we diagnose cardiogenic shock?
Sustained hypotension (SBP <90), reduced Cl (<2.2 l/min/m2) with an elevated PCWP > 18 (pulmonary capillary wedge pressure)
44
How do we generally treat cardiogenic shock?
Fluid resuscitation (unless frank pulmonary edema is present), furosemide for pulmonary edema, correct rhythm abnormalities (Mg/K), consider vasopressor therapy. Avoid BB and CCB
45
How do we treat cardiogenic shock with STEMI pts?
PCI or CABG, fibrinolytic therapies for unstable patients, intra aortic balloon pump, alternative LV assist devices for circulatory support.
46
How is distributive shock defined as?
Excessive vasodilation resulting in impaired distribution of blood flow.
47
What is SIRS? What are the criteria?
Systemic Inflammatory response syndrome (SIRS), criteria (2 or more): - Temperature of >38.3 or <36 - HR >90 bpm - RR > 20 or mechanical vent - WBC >12,000 or <4,000 or >10% immature forms (bands)
48
How do you determine qSOFA?
2 or more: - RR >/= 22 - altered mentation SBP = 100 mmHg
49
How should you initially resuscitate a sepsis induced hypoperfusion?
- Measure lactate (repeat if elevated (>2 mmol/L) - Blood cultures and broad spectrum abx - fluids for hypotension or lactate >4 mmol/L - Vasopressors for MAP >/= 65 mmHg (to maintain 65 mmHg or greater)
50
At what rate and what types of fluids should a septic patient receive?
Crystalloids are preferred, 30 mL/kg Albumin may be used for pts with substantial requirements of crystalloids after initial resuscitation. CVP is used for fluid status (goal 8-12 mmHg or 12-15 if mechanically ventilated)
51
What is the target goal for vasopressor therapy in shock?
MAP >/= 65
52
Norepinephrine: Dose: Rate:
Dose: 0.02-3 ug/kg/min Rate: 4-30 ug/min
53
Why is norepinephrine considered first line therapy?
Increases MAP/SVR via vasoconstriction and causes little change in heart rate and stroke volume, may be a little more effective at reversing hypotension than dopamine
54
Vasopressin | Rate:
0.04 units/min, can do 0.03 units/min to NE to raise MAP or decrease NE >0.03-0.04 units/min is considered salvage therapy.
55
What are some considerations to think about with vasopressin?
increases BP in pts refractory to other vasopressors, antidiuretic properties via V2 receptors, may increase serum cortisol via V3 receptors (proinflammatory and increases BP), higher doses associated with cardiac, digital and splanchnic ischemia
56
Epinephrine Dose: Rate:
Dose: 0.01-0.5 mcg/kg/min Rate: 2-10 mcg/min
57
What's epinephrine's role in therapy?
Either added to possibly substituted for NE
58
What are some considerations to think about with epinephrine?
Decreases renal and splanchnic blood flow, increases lactate levels via stimulation of skeletal B2 receptors
59
Phenylephrine Dose: Rate:
Dose: 0.5-9 mcg/kg/min Rate: 40-300 mcg/min
60
Why would you use phenylephrine?
Not normally recommended. Only use if NE is associated with serious arrhythmias High CO and persistently low BP Salvage therapy
61
What are some considerations if thinking about using phenylephrine?
It's purely an alpha activator and the least likely drug to cause tachycardia. May decrease stroke volume (limited use)
62
Dopamine | Rate:
- 1-3 mcg/kg/min - 3-10 mcg/kg/min - 10-20 mcg/kg/min
63
What's dopamine's role in shock?
It is an alternate to NE when there is a low risk of tachyarrhythmias and absolute or relative bradycardia. - Do not use low doses for renal perfusion
64
What are some considerations when thinking of using dopamine?
- increases MAP and CO due to increase in stroke volume and HR. - may be useful with compromised systolic function, but causes more tachycardia and may be more arrhythmogenic than NE - Influences endocrine response via hypothalamic pituitary axis and has immunosuppressive effects
65
When can you use dobutamine?
myocardial dysfunction as suggested by elevated cardiac filling pressures and low CO. Ongoing signs of hypoperfusion despite adequate intravascular volume and adequate MAP
66
When should you use hydrocortisone therapy?
Hemodynamic instability despite fluid resuscitation and vasopressor therapy.
67
When should you initiate glucose control? What is the goal?
When two blood glucose measures are >180 mg/dL, target for = 180 mg/dl. Monitor q1-2 hours until glucose and insulin infusion is stable then every 4 hours thereafter.
68
When should you use stress ulcer prophylaxis?
W/ bleeding risk factors: | - coagulopathy (INR >1.5, platelets <50,000), mechanical ventilation >48 hours, and possibly hypotension.
69
What is an indication for rapid sequence intubation?
Aspiration, or loss of airway (protect the airway!)
70
What steps should you take for rapid sequence intubation?
Induction then paralyze
71
What are the types of induction meds?
Etomidate, Ketamine, midazolam, propofol
72
What is the onset and duration of etomidate?
Onset: 10-30 sec Duration: 4-10 min
73
What are some adverse effects of etomidate?
Adrenal insufficiency (controversial), myoclonic activity (brief, minimal)
74
What is the dosing for etomidate?
0.3 mg/kg
75
What is the dosing for Ketamine?
1.5 mg/kg (1-2 mg/kg)
76
What is the onset and duration for ketamine?
Onset: 45-60 seconds Duration: 10-20 minutes
77
What are some adverse effects of ketamine?
Increased HR, BP, caution with CV disease and hypertensive patients. increased intraocular pressure Increased ICP Bronchodilator (theoretical)
78
What is the dosing for midazolam?
0.3 mg/kg (0.1-0.3 mg/kg)
79
What is the onset and duration of midazolam?
Onset: 60-90 sec Duration: 30-80 minutes (up to several hours)
80
What are some adverse effects of midazolam?
Hypotension, respiratory depression, paradoxical agitation. Dose and patient response can vary.
81
What is the dosing for propofol?
1.5 mg/kg (1-2 mg/kg)
82
What is the onset and duration of propofol?
Onset: 15-45 sec Duration: 5-10 minutes
83
What are some adverse effects of propofol?
Hypotension, myocardial depressant and decreases in SVR, caution with egg allergy, reduces ICP
84
What are the types of paralytic medications?
Succinylcholine, rocuronium, vecuronium
85
What is the dosing for succinylcholine?
1.5 mg/kg
86
What is the onset and duration for succinylcholine?
Onset: 30-60 sec Duration: 6-10 min
87
What is the onset and duration for rocuronium?
Onset: 45-60 sec Duration: 45-70 minutes
88
What is the dosing for rocuronium?
0.6-1.2 mg/kg (usually around 1)
89
What are the adverse effects of succinylcholine?
Rhabdomyolysis, hyperkalemia, fasciculations, elevated intraocular pressure, malignant hyperthermia (rare), caution in pts with neuromuscular disease
90
What is the dosing for vecuronium?
0.1 mg/kg
91
What is the onset and duration for vecuronium?
onset: 120-180 s Duration: 40-60 min
92
What are some adverse effects of rocuronium?
longer onset compared to succinylcholine, few adverse effects.
93
What are some adverse effects of vecuronium?
longer onset compared to succinylcholine, few adverse effects.
94
How should you monitor pain in communicating patients?
Numeric rating scale
95
How can you monitor for pain in non communicative patients/
Behavioral pain scale, critical care pain observation tool
96
What is the gold standard for pain assessment?
Pt self assessment, also use vital signs to cure further assessments of pain
97
What is the first line treatment for non-neuropathic pain in acute settings?
Fentanyl, morphine, hydromorphone
98
How is fentanyl metabolized?
Hepatically, N-dealkylation, CYP3A4/5 substrate
99
How is morphine metabolized?
Hepatically, glucuronidation
100
How is hydromorphone metabolized?
hepatically, glucuronidation
101
What is the onset and duration of fentanyl?
onset: 1-2 minutes Duration: 30 min-1 hour
102
What is the onset and duration of morphine?
Onset: 5-10 min Duration: 4 hours
103
What is the onset and duration of hydromorphone?
Onset: 5-15 min Duration: 3-4 hours
104
What are the active metabolites for morphine?
6- and 3-glucuronide (respiratory depression)
105
How is fentanyl, morphine and hydromorphone excreted?
renally
106
When can fentanyl accumulate in the body?
with hepatic impairment
107
When can morphine accumulate in the body?
with renal/hepatic impairment
108
When can hydromorphone accumulate in the body?
in hepatic impairment
109
Which opioids can cause histamine release?
morphine, hydromorphone (minimally)
110
When should you avoid morphine?
Hemodynamic instability d/t histamine release
111
What are the major side effects of fentanyl?
resp depression, tachyphylaxis, constipation, chest wall rigidity and largygospasm.
112
What are the major side effects of morphine and hydromorphone?
respiratory depression and constipation.
113
What are some underlying causes of agitation?
Pain, delirium, hypoxemia, hypoglycemia, hypotension, withdrawal
114
What are some ways to nonpharmacologically treat patients with agiation/confusion?
minimize light and noise, cluster patient care activities, decrease stimuli at night
115
What is considered light sedation?
arousable, able to follow commands
116
What is considered deep sedation?
unresponsive to painful stimuli
117
How can you measure patient responsiveness/awareness during a daily sedation interruption?
Open eyes Maintain eye contact Squeeze hand/ stick tongue out wiggle toes (meet 3/4 of the requests). Restart meds at half dose
118
How can we reduce mechanical ventialation time?
- daily sedation interruption | - light sedation over deep sedation
119
What types of sedatives are preferred? why?
Non-benzodiazepines in mechanically ventilated patients. Reduces risk of delirium
120
When might you consider benzos in sedation therapy?
seizures, alcohol or benzo withdrawal
121
What is a contraindication against midazolam use?
Severe hepatic impairment.
122
How is midazolam metabolized?
Hepatic phase I
123
how is lorazepam metabolized?
Hepatic phase II, less affected by liver impairment
124
How is midazolam and lorazepam excreted?
Renally
125
What is some considerations for lorazepam?
risk of propylene glycol toxicity
126
What are the side effects for midazolam and lorazepam?
resp depression, paradoxical psychosis, hypotension
127
how is propofol metabolized?
hepatically
128
how is propofol excreted?
renally
129
what are the side effects of propofol?
resp depression, brady cardia, hypertriglyceridemia, hypotension, overfeeding, discolored urine, PRIS
130
what are the side effects of dexmedetomidine?
bradycardia, hypotension, loss of airway reflexes
131
how is dexmedetomidine metabolized and excreted?
hepatically metabolized and renally excreted
132
Does midazolam have active metabolites?
Yes, may accumulate in renal impairment
133
what considerations do you have to think about with dexmedetomidine?
minimal respiratory depression, cannot achieve deep sedation
134
what is the onset and half life of midazolam?
onset: 2-5 min | half life: 3-11 hr
135
what is the onset and half life of lorazepam
onset:15-20 min | half life: 8-15 hr
136
what is the onset and half life of propofol
onset: 1-2 min | half life: 3-10 min
137
what is the onset and half life of dexmedetomidine?
onset: 5-10 minutes duration: 1.8-3.1 hr
138
what is the mechanism of propofol infusion syndrome (PRIS)?
prolonged (>48 hours) of high dose administration (>70 mcg/kg/min) leading to dysfunction of mitochondria, fatty acid oxidation impairment, diversion of carb metabolism to fat substrate and propofol metabolite accumulation
139
what is the presentation of PRIS?
metabolic acidosis, hypertriglyceridemia, hypotension, arrhythmia, rhabdomyolysis, acute renal injury, hyperkalemia
140
what causes propylene glycol toxicity
accumulation of higher dosed lorazepam infusions (15-25 mg/hr), lower doses can also cause toxicity
141
how is propylene glycol toxicity presented as?
Metabolic acidosis, acute kidney injury, seizures
142
how can you monitor for glycol toxicity?
osmol gap >10-12 mOsm/L can help identify the accumulation
143
What causes DKA?
Absolute insulin deficiency leading to utilization of ketones for energy and causing ketoacidosis. Patient is also hyperglycemic.
144
What causes hyperosmolar hyperglycemic state (HHS)?
Relative insulin deficiency leading to minimal (or absent) ketogenesis. Hyperglycemia leads to loss of water and electrolytes (glycosuria) causing hyperosmolarity from dehydration and decreased fluid intake.
145
How do you diagnose for DKA?
``` Blood glucose >250 Arterial pH <7.3 Bicarb <18 Anion gap >10 Positive Ketones ```
146
How do you diagnose for HHS?
Blood glucose >600 | Serum osmolarity >320
147
What can cause euglycemic DKA?
SGLT-2 inhibitors, ketosis, acidosis
148
How do you calculate anion gap?
Na-Cl- HCO3 = anion gap
149
What is a normal anion gap? and defines metabolic acidosis?
Normal: 7-9 | Metabolic acidosis: >10-12
150
What is a normal serum osmolarity? What defines hyperosmolar?
Normal: 285-295 Hyperosmolar: >/= 320
151
how do you calculate serum osmolarity?
2(Na) + glu/18 + BUN/2.8 = serum osmolality
152
What are the treatment goals for DKA and HHS?
Rehydration, insulin, manage electrolyte and acid/base imbalances (consider bicarb in severe acidosis and prevent hypokalemia), Identify precipitating events (underlying infection, non-adherence, heavy drug/alcohol use)
153
How should you fluid resuscitate a patient for DKA or HHS?
- NS IV 15-20 ml/kg over the first hour - NS or 1/2 NS 250-500 ml/hr until blood glucose is normalized (NS if Na is low, 1/2 NS if Na is normal) - D5 in 1/2 NS at 125-250 ml/hr until DKA is resolved.
154
How do you calculate for corrected Na?
Measured Na + [(serum glucose- 100)/100] x1.6
155
What is the goal for potassium replacement in DKA and HHS?
4.0-5.0
156
When should you begin to replace potassium in DKA and HHS? How much should you administer?
when K< 5.2, 20-30 mEq K per L of fluid, (10 mEq is ~0.1 mEq/L), withhold insulin treatment if K <3.3 mEq/L
157
What should you do for an acid/base imbalance?
Acidosis usually will resolve with fluids and insulin. pH >/= 6.9 does not need any sodium bicarbonate. pH <6.9: 100 mEq of sodium bicarb in 400 ml sterile water with 20 mEq KCl administered at a rate of 200 ml/h for 2 h until the venous pH is >7.0
158
What is the initial insulin treatment for DKA and HHS?
0.1 units/kg IV bolus + 0.1 units/kg/hr continuous IV infusion or 0.14 units/kg/hr of continuous IV infusion (Goal is to decrease glucose by 50-75 mg/dl/hr)
159
When do you transition to the second step of insulin treatment for DKA and HHS?
DKA: glucose <200 mg/dL HHS: glucose <300 mg/dL
160
What is the second step of insulin in treating DKA and HHS?
Decrease to 0.02-0.05 units/kg/hr continuous IV infusion (also switch to D5 and 1/2 NS).
161
Where should you maintain blood glucose for DKA and HHS until resolution?
DKA: 150-200 HHS: 200-300
162
What determines resolution of DKA?
Serum glucose <200 pH >7.3 Anion gap closure <12 Serum bicarb >18
163
What determines resolution of HHS?
Normal osmolality, return to normal mental status
164
How should you transition to SQ insulin from IV after hyperglycemic crisis is resolved?
Dose: - insulin naiive: 0.5-0.8 units/kg/day - previous use: may use previous dose if adequate. Overlap IV and SQ insulin by 1-2 h to prevent the return to DKA/HHS Make sure patient can tolerate oral food
165
What are some adverse drug effects that can cause ADHF?
NSAIDs (AKI?), decongestants (hypertension, increased afterload), Alka-seltzer (high sodium), beta agonists (risk of exacerbation)
166
How do you calculate cardiac index? What is considered normal?
CI =CO/BSA | Normal CI = 2.8 - 4.2 L/min/m2

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