Exam 1 Pre-Op Evaluation Flashcards
Goals of pre-op evaluation include
- Obtaining pt’s medical hx
- Formulate an assessment of pt’s peri-operative risk / mitigate risk
- Develop a plan for any clinical optimization
- Plan post-op pain management
- Lay out expectations for to patient.
What are the benefits of Pre-op Evaluation from the Patient’s standpoint?
- Reduce Anxiety
- Provide Education (Options)
- Discuss Meds
- Reduce Post-op Morbidity
- Answer Q’s
- Advocate what CRNAs do
What are the benefits of Pre-op Evaluation from Anesthesia’s standpoint?
- Learn Medical Conditions.
- Devise an anesthetic plan (Intra/Post-op)
- Time for consultants
- DNR
What are the benefits of Pre-op Evaluation from the surgeon/hospital’s standpoint?
- Decrease cost of peri-operative care
- Improve efficiency
- Decreases cancellation/delays
Surgical procedures performed under anesthesia requires _________.
Preoperative Evaluation
Correct diagnosis can be made in ____% of cases on the basis of history alone.
56%
What are the components of a medical history?
- Underlying condition requiring surgery
- Known medical problems/past medical issues
- Previous surgeries/anesthetic history
- Anesthetic related complications
- Review of systems
- Medications
- Allergies
- Tobacco/ETOH/Illicit drug use
- Functional capacity
What are some examples of anesthetic-related complications?
- MH
- AChesterase deficiency
- Difficult airway
- PONV
What is the formula for BMI in both metric and imperial
Metric (BMI = kg / m2)
Imperial (BMI = 703 x lbs / in2)
What BMI is considered underweight
BMI < 18.5
What BMI is considered normal
BMI 18.5 - 24.9
What BMI is considered overweight
BMI 25.0 - 29.9
What BMI is considered obese
BMI 30.0 and above
What are the components to emergent physical examination (AMPLE)?
- Allergies
- Medications
- Past Medical History
- Last Meal Eaten
- Events leading up to need for surgery/ procedure
What are the components of an airway examination?
- Mallampati classification
- Inter-incisors gap
- Thyromental distance
- Forward movement of mandible
- Range of cervical spine motion: flexion and extension
- Document loose or chipped teeth, tracheal deviation
Cardiovascular complications account for ____ perioperative mortalities
Almost half
What court case in 1957 established what the practice of informed consent was suppose to look like in the practice of modern medicine?
Salgo v Trustees of Leland Standford Hospital
What are the three goals of shared decision making?
- Communicating with pts about risk, benefits of possible interventions
- Elicit pt’s goals, values, and concerns
- Assist pts in how to conceptualize the risk and benefits/ how to approach the decision.
What are THREE types of DNR orders in the perioperative period, and what do they entail
- Full attempt at resuscitation
- Limited attempt at resuscitation defined with regard to specific procedures
a) May refuse certain resuscitation procedures
b) Anesthesia should inform pt/surrogate about which procedures are essential and not essential for the success of the anesthetic and proposed surgery - Limited attempt at resuscitation defined with regard to the pt’s goals and values
a) Allows anesthesia and surgical teams to use clinical judgement in determining appropriate resuscitation procedures
What is the percent chance of mortality in a high risk procedure?
Greater than 5%
What is the percent chance of mortality in an intermediate risk procedure?
1%-5%
What is the prediction tool used to estimate risk of cardiac complications after surgery?
Revised Cardiac Risk Index
What is the percent chance of mortality in a low risk procedure?
Less than 1%
What are examples of a high risk procedure?
- Aortic and major vascular
- Peripheral vascular
What are examples of an intermediate risk procedure?
- Intraabdominal surgery
- Intrathoracic surgery
- Carotid endarterectomy
- Head/neck surgery
What are the six components of the the Revised Cardiac Risk Index recommended by the American College of Cardiologist (ACC) and American Hospital Association (AHA)?
- High risk surgery
- Ischemic heart disease
- Hx of CHF
- Hx of cerebrovascular disease
- DM requiring insulin
- Cr > 2.0 mg/dL
What are examples of a low risk procedure?
- Ambulatory surgery
- Breast surgery
- Endoscopic procedures
- Cataract surgery
- Skin surgery
- Urologic surgery
- Orthopedic surgery
What is the purpose of a functional capacity assessment
- Assessment of cardiopulmonary fitness
- Estimates pt risk for major post-op morbidity or mortality
- Determines if further testing is necessary
A Revised Cardiac Index Score of 0 has a _______% risk of cardiac complications after surgery.
0.4%
A Revised Cardiac Index Score of 1 has a _______% risk of cardiac complications after surgery.
1.0%
A Revised Cardiac Index Score of 2 has a _______% risk of cardiac complications after surgery.
2.4%
A Revised Cardiac Index Score of >3 has a _______% risk of cardiac complications after surgery.
5.4%
What is functional capacity measured in?
METs (metabolic equivalent of task)
What situations would a surgery be considered an emergency?
Life or limb would be threatened if surgery did not proceed within 6 hours or less.
What situation will allow the patient to proceed to the surgery without pre-op cardiac assessment?
Emergent Surgery
What is a MET?
What is 1 MET = to?
What is the cut off?
MET is the rate of energy consumption
1 MET = 3.5 mL/kg/min
Greater than 4 METs
What 4 cardiac conditions will likely result in postponement of surgery?
- Acute coronary syndrome
- Decompensated heart failure
- Significant arrhythmia
- Severe valvular disease
What situations would a surgery be considered urgent?
Life or limb would be threatened if surgery did not proceed within 6 to 24 hours.
What situations would a surgery be considered time-sensitive?
Delay in surgery exceeding 1 to 6 weeks would adversely affect patient outcomes. (etc. EGD, colonoscopy)
What are the 6 steps in the preoperative cardiac risk assessment algorithm?
- Emergency surgery
- Active cardiac conditions
- Estimate risk of perioperative death or MI
- Assess functional capacity
- Assess whether further testing will impact care
- Proceed to surgery or consider alternative strategies
How many classes of ASA Physical Status are there?
6
What are the additional components Meyer Sakland added onto the ASA PS?
- The planned surgical procedure
- The ability and skill of the surgeon in the partciular procedure contemplated
- The attention to postoperative care
- The past experience of the anesthetist in similar circumstances
What type of individual will be classified as ASA 1?
A normal healthy patient.
Healthy non-smoker, little to no EtOH use.
What type of individual will be classified as ASA 2 ?
A pt with mild systemic disease.
Mild disease only, w/o substantial functional limitations: current smokers, social drinkers, pregnancy, BMI 30-40, well-controlled DM/HTN, mild lung disease.
What type of individual will be classified as ASA 3?
A pt with severe systemic disease
Substantive functional limitations: one or more moderate to severe disease.
Poorly controlled DM, HTN, COPD, morbid obesity BMI >40, hepatitis, severe EtOH, pacemaker, moderately reduced EF, ESRD w/ dialysis, premature infants <60 weeks, Hx (greater than 3 months) of MI, CVA, TIA, CAD/stents
What type of individual will be classified as ASA 4?
A patient with severe systemic disease that is a constant threat to their life
Recent (<3 months) MI, CVA, TIA, CAD/stents, ongoing cardiac ischemia, severe valvular disorder, severe reduced EF, sepsis, DIC, ARDS, ESRD w/o dialysis.
What type of individual will be classified as ASA 5?
A pt not expected to survive w/o operation.
Ruptured AAA, massive trauma, intracranial bleeding with mass effect, ischemic bowel with multi-organ dysfunction.
What type of individual will be classified as ASA 6?
A declared brain-dead patient whose organs are being removed for donor purposes.
What influences perioperative outcome in terms of the anesthesia provider?
- Provider characteristics
- Error in judgement
- Mishaps
What influences patient outcomes in terms of the entire surgery?
- Anesthesia
- Patient disease
- Errors in judgement
- Location of postoperative care
What should pre-op testing satisfy in order to be considered useful?
- Diagnostic efficacy
- Diagnostic effectiveness
- Therapeutic efficacy
- Therapeutic effectiveness
When is preop CBC/H&H warranted?
- Hx of increased bleeding, hematologic disorders, anti-coag therapy, poor nutritional status
- ASA-PS 3 or 4 undergoing intermediate-risk procedures
- All pts undergoing major procedures
When is preoperative Renal function testing warranted?
- DM, HTN, cardiac disease, dehydration, renal disease, fluid overload
- ASA-PS 3 or 4 undergoing intermediate-risk procedures
- ASA-PS 2, 3, or 4 undergoing major procedures
When are preoperative electrolyte labs warranted?
- Suspected undiagnosed or worsening condition that will affect peri-op management
- Renal or hepatic disease, malnutrition, malabsorption, ETOH abuse, HF, arrhythmias, medications that may cause an imbalance
When is preoperative liver function testing warranted?
- Liver injury and physical exam findings
- Hepatitis, jaundice, cirrhosis, portal HTN, biliary disease, gallbladder disease, bleeding disorders
- GI bleed (indirect)
When is preoperative coagulation testing warranted?
- Known or suspected coagulopathy indentified on pre-op eval
- Known bleeding disorder, hepatic disease, and anticoagulant use
- ASA-PS 3 or 4; undergoing intermediate, major or complex surgical procedures; known to take anticoagulant meds or chronic liver disease
When are preoperative serum glucose and HbA1c testing warranted?
- Known DM (or family Hx)
- Obesity (BMI >50)
- CV or intracranial disease
- Steroid history
When is preoperative urinalysis warranted?
Suspected UTI and unexplained fever or chills