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
- Answer Q’s
- Reduce Post-op Morbidity
- 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 - reverse for perioperative period
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 a _________ by the anesthesia provider.
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
- Allergies
- Medications
- Previous surgeries/anesthetic history
- Anesthetic related complications
- Review of systems
- Tobacco/ETOH/Illicit drug use
- Functional capacity
What are some examples of anesthetic-related complications?
- Difficult airway
- MH
- AChesterase deficiency
- 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?
- 1)Communicating and 2)helping pts conceptualize risk & benefits of possible interventions
- Elicit pt’s goals, values, and concerns
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
- Limited attempt at resuscitation defined with regard to the pt’s goals and values
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 worth 1 point of the the Revised Cardiac Risk Index recommended by the American College of Cardiologist (ACC) and American Hospital Association (AHA)?
- High risk surgery
- Hx of CHF
- Hx of cerebrovascular disease (CVD)
- Ischemic heart disease
- Cr > 2.0 mg/dL
- DM requiring insulin
More than 3 high risk of cardiac event
What are examples of a low risk procedure?
- Ambulatory surgery
- Breast surgery
- Cataract surgery
- Endoscopic procedures
- 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 4 additional components Meyer Sakland added onto the ASA PS?
Qualifiers on the medical side:
- 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, mild lung disease
w/o substantial functional limitations:
current smokers
social drinkers
pregnancy
BMI 30-40
well-controlled DM/HTN
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 chronic diseases:
- MI, CVA, TIA, CAD/stents >3 months
- Moderately reduce EF
- Pacemaker
- HTN
- COPD
- ESRD w/ dialysis
- DM; BMI >40
- Severe ETOH
- Premature infants <60 weeks
What type of individual will be classified as ASA 4?
- A patient with severe systemic disease that is a constant threat to their life
- Acutely severe disease:
- Recent (<3 months) MI, CVA, TIA, CAD/stents
- ongoing cardiac ischemia,
- severe valvular disorder,
- severe reduced EF,
- ARDS
- ESRD w/o dialysis.
- sepsis; DIC
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 & therapeutic efficacy & 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
- Any condition/situation that may cause an imbalance (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
- Liver problems symptoms : 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
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 indicated?
Suspected UTI and unexplained fever or chills