Extra Stuff Flashcards
Physical Exam Maneuvers:
What are the effects of
1) valsalva?
2) handgrip?
3) Squatting?
1) Valsalva reduces preload
2) Handgrip increases after load
3) Squatting increases preload
What are the components of a pre-thoracotomy evaluation? (3)
1) Respiratory mechanics: FEV1 and ppoFEV1
2) Cardiopulmonary reserve: VO2 Max, stair climbing, 6-minute walk test
3) Lung Parenchymal function: DLCO, PaO2, PaCO2
*Others: Split lung function studies, spirometry, exercise tolerance test, V/Q scan
Formula to estimate normal arterial PaO2 on room air?
Normal arterial PaO2 = 102 - (age/3)
In what ways can PFT’s be helpful, especially for pneumonectomy/lobectomy surgeries? (4)
1) Help predict post-op pulm function (ppoFEV1)
2) Identify risk of post-op pulmonary complications
3) Determine severity of COPD, obstructive, or restrictive disease
4) Determine if patient might benefit from bronchodilator therapy
predicted postoperative FEV1 cutoff value to remember?
<40% = higher risk of right heart failure, other pulmonary complications
What conditions may produce cyanosis in the first year of life? (Generally, 1 & 5 examples)
Generally: Any condition that result sin right to left shunting
1) Tetralogy of Fallot
2) Transposition of the great vessels
3) Truncus arteriosus
4) Tricuspid Atresia
5) Total anomalous pulmonary venous return
Drug dosing in obesity:
Propofol
Etomidate
Ketamine
Propofol: Induction = lean body weight, Maintenance = total body weight
Etomidate: Induction = lean body weight
Ketamine: Induction: Lean body weight
maintenance = ideal body weight
Drug Dosing in obesity:
Rocuronium
Vecuronium
Cisattacurium
Succinylcholine
Roc, Vec, and Cis: Induction dose = Ideal body weight
Succinylcholine: Induction = Total body weight
Infusion = Total body weight
Drug dosing in obesity:
Sugammadex
Neostigmine
Sugammadex: Total body weight or (IBW + 40%)
Neostigmine: Total body weight
Why Utilize a precordial or esophageal stethoscope?
May facilitate early detection of some critical events such as:
1) Cardiac arrhythmias
2) Laryngospasm
3) CHanges in CO and BP
Roller Pumps:
1) How is Flow produced?
2) Pros of roller pumps (2)
3) Cons of roller pumps (4)
1)partial compression of tubing by two roller heads produces forward flow
2) Pros:
- Not sensitive to preload or afterload,
- can delivery pulsatile flow,
- reliably produces a certain amount of flow based on pump speed
3) Cons:
- Increased shear damage to RBCs,
- potential to delivery entrained air,
- risk of overpressurization (rupture of tubing)
- risk of preload occlusion leading to pressure-induved CAVITATION
Centrifugal pumps:
1) How is flow produced?
2) Pros (3)
3) Cons (3)
1) Rotational force generates forward flow
2) Pros:
-less damage to RBCs
- Will stop if air is entrained (will NOT deliver air embolism)
- No risk of over pressurization or cavitation
3) Cons:
- Sensitive to changes in preload or afterload
- Can NOT generate pulsatile flow
- Only able to partially compensate for decreases in forward flow
1) What risks are associated with rapid sequence induction?
2) What strategies can help mitigate these risks?
1) Untitrated administration of an induction drug
- increased risk of exaggerated sympathetic response to laryngoscopy –> HTN
- Increased risk of hypotension
2) To mitigate risk:
- Administer lidocaine, opiates, ketamine during induction to attenuate sympathetic response to DL
- Be prepared to treat any hypotension that develops
What are the negative effects of metabolic alkalosis? (4)
1) Leftward shift of hemoglobin dissociation curve (decreased oxygen delivery to peripheral tissues)
2) Reduced ionized calcium
3) Increased risk of seizures
4) Decreased serum potassium (increased risk of arrhythmia)
Reasons to place a pulse ox on a neonate? (4)
1) If you anticipate the need for resuscitation
2) If PPV is required
3) If you need to use supplemental O2
4) If cyanosis is persistent after birth
Where to place a pulse ox on a neonate?
Right upper extremity (Pre-ductal saturation)
Neonatal resuscitation algorithm steps? (6)
6 main steps, continue along algorithm/escalate to next step if you don’t get expected response:
1) Assess neonate
2) Warm, dry, stimulate baby. Clear airway/suction oropharynx if needed
- if HR <100, apnea, gasping, or cyanosis
3) place RUE SpO2, start PPV (start with RA, titrate supplemental O2 as needed), consider EKG
-if HR remains <100, or unable to attain goal SpO2 with PPV
4) Intubate, titrate FiO2 to goal SpO2
-If HR remains <100, or drops <60 at any time
5) Start chest compressions, intubate if not already done, and establish venous access (umbillical vein catheter or IO)
-If HR remains <60
6) IV epi (10mcg/kg) or tracheal epi (100mcg/kg), treat hypovolemia with NS or type O- blood, consider pneumothorax
GSC Score: Motor Response?
1 to 6 (think V-6 motor)
6 = obeys commands (“squeeze my hand”)
5 = moves to localize pain
4 = withdraws from pain, but doesn’t localize
3 = Abnormal flexion (decorticate posturing)
2 = Abnormal extension (decerebrate posturing)
1 = No movement
GCS Score: Verbal response
1 to 5 (Roman numeral V for “verbal”)
5 = Alert/oriented to time, person, place
4 = confused
3 = inappropriate words
2 = incomprehensible sounds
1 = no response
GCS Score: eye opening?
1 to 4
4 = spontaneous eye opening
3 = eyes open to speech/verbal command
2 = eyes open to pain
1 = no response
GCS: Three components?
- Eye opening score, 1 to 4
- Verbal score, 1to 5
- Motor score, 1 to 6
Apgar Scoring: Criteria and how scored?
Appearance (skin color)
2 = Normal color
1= Blue-ish extremities (acrocyanotic)
0= blue, grey, or pale all over
Pulse (heart rate)
2 = >100
1 = <100
0 = absent
Grimace (reflex irritability
2 = pulls away, sneezes, or coughs with stim
1 = grimace with stim, but doesnt pull away
0 = no response to stim
Activity (Muscle tone)
2 = active, spontaneous movement
1 = arms/legs flex, but little movements
0 = flaccid tone/no movement
Respirations ( resp rate)
2 = normal rate/effort, good cry
1 = slow, irregular breaths, no cry
0 = absent
Indications for arterial line? (5)
1) Inability to use a BP cuff
2) Hemodynamic monitoring (tight BP control, anticipate instability or large fluid shifts, titrating vasoactive drugs)
3) Need for repeated/frequent blood sampling
4) Continuous cardiac monitoring (such as for bypass or cardiac surgery)
5) Diagnostic or interventional procedure (endovascular procedure, intra-aortic balloon pump counter-propulsion timing, etc.)
Contraindications for arterial line (5)
1) Absence of collateral circulation,
2) infection/burns over the site,
3) aneurysm,
4) AV malformation/fistula
5) Patient refusal
Factors that decrease MAC? (9)
1) Acute alcohol use
2) older age (6% decrease per decade over 40)
3) hyponatremia
4) hypothermia
5) anemia (esp. hgb <5)
6) Hypercarbia/acidosis
7) Hypoxia
8) Pregnancy
9) Other drugs/adjuncts (nitrous, opioids, benzos, propofol, alpha-2 agonists, lidocaine)
Does thyroid disease affect MAC?
NO.
Neither hyperthyroid nor hypothyroid has any effect on MAC
ASA Standard monitors?
1) Qualified anesthesia personnel who can interpret and respond appropriately to monitors
2) VOTC
- Ventilation: end tidal CO2 (capnography), Vent with inhalational gas analyzer, tidal volume measurement, disconnect alarm
- Oxygenation: Pulse Ox/SpO2, inspired oxygen analyzer with low level alarm
- Temperature: “Must be monitored with changes in body temp are expected through the duration of the case
- Circulation: Heart rate, BP (minimum q5 mins), continuous EKG
EKG: 3 lead vs. 5 lead?
- 3 lead: RA, LA, LL
Leads I, II, III (limb leads) - 5 lead: RA, LA, RL, LL, V5
Leads I, II, III, aVR, aVL, aVF, V5
Which EKG lead is best for monitoring heart rhythm?
Lead II = has best visibility of P-waves
Which EKG lead is best for monitoring for ischemia?
Lead V5 = most sensitive for ischemia (anterior and lateral ischemia)
Estimated blood volume:
Pre-term neonate?
100ml/kg
Estimated blood volume:
Term neonate?
90 ml/kg
Estimated blood volume:
Infant (3 - 12 months)?
80 ml/kg
Estimated blood volume:
Child ( 1 - 12 years)?
75 ml/kg
Estimated blood volume:
Adult?
70 ml/kg
Estimated blood volume:
Pregnant woman?
90 ml/kg