Pre-operative A ssessment Dr Gazi YILDIRIM. Goals of preoperative assessment History and physical examination to determine relevant tests and consultations.

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Presentation transcript:

Pre-operative A ssessment Dr Gazi YILDIRIM

Goals of preoperative assessment History and physical examination to determine relevant tests and consultations Guided by patient choice and medical risk factors choose a plan of care Informed consent Educate patient about anaesthesia, pain management and perioperative care Reduce patient care costs

Mortality related to anaesthesia Approx 1:26,000 anaesthetics One third of deaths are preventable Causes in order of frequency – inadequate patient preparation – inadequate postoperative management – wrong choice of anaesthetic technique – inadequate crisis management

Pre-operative investigations CBC :all patients. ECG : all patients > 40 years. Chest x-ray : all patients >30 years Liver functions : all patients. Hepatitis : ?all patients Echocardiogram : abnormal ECG, ischemic heart, heart failure.

Airway assessment Best done by an anaesthetist Certain features of concern – small mouth – poor dentition – limited neck mobility – scars/surgery/anatomical abnormalities – obesity

Mallampati scoring system

CLASSIFICATION OF OPERATION Class Definition Clean Operations in which no inflammation is encountered. The respiratory, alimentary or genitourinary tracts are not entered. There is no break in aseptic operating theatre technique.

CLASSIFICATION OF OPERATION Class Definition Clean-contaminated Operations in which the respiratory, alimentary or genitourinary tracts are entered but without significant spillage.

CLASSIFICATION OF OPERATION Class Definition Contaminated Operations where acute inflammation (without pus) is encountered. or where there is visible contamination of the wound. Examples include gross spillage from a hollow viscus during the operation or compound/open injuries operated on within four hours.

CLASSIFICATION OF OPERATION Class Definition Dirty Operations: In the presence of pus. where there is a previously perforated hollow viscus, or compound/open injuries more than four hours old.

PROBABILITY OF WOUND INFECTION BY TYPE OF WOUND AND RISK INDEX Risk Index Clean 1.0% 2.3% 5.4% Clean-contam. 2.1% 4.0% 9.5% Contaminated 3.4% 6.8% 13.2%

ASA CLASSIFICATION OF PHYSICAL STATUS 1 =A normal healthy patient 2 =A patient with a mild systemic disease 3 = A patient with a severe systemic disease that limits activity, but is not incapacitating 4 =A patient with an incapacitating systemic disease that is a constant threat to life 5 =A moribund patient not expected to survive 24 hours with or without operation

American Society of Anesthesiologists Patient Classification ASA 1 A normal, healthy patient. The pathological process for which surgery is to be performed is localized and does not entail a systemic disease. Example: An otherwise healthy patient scheduled for a cosmetic procedure.

American Society of Anesthesiologists Patient Classification ASA 2 A patient with systemic disease, caused either by the condition to be treated or other pathophysiological process, but which does not result in limitation of activity. Example: a patient with asthma, diabetes, or hypertension that is well controlled with medical therapy, and has no systemic sequelae

American Society of Anesthesiologists Patient Classification ASA 3 A patient with moderate or severe systemic disease caused either by the condition to be treated surgically or other pathophysiological processes, which does limit activity. Example: a patient with uncontrolled asthma that limits activity, or diabetes that has systemic sequelae such as retinopathy

American Society of Anesthesiologists Patient Classification ASA 4 A patient with severe systemic disease that is a constant potential threat to life. Example: a patient with heart failure, or a patient with renal failure requiring dialysis.

American Society of Anesthesiologists Patient Classification ASA 5 A patient who is at substantial risk of death within 24 hours, and is submitted to the procedure in desperation. Example: a patient with fixed and dilated pupils status post a head injury.

American Society of Anesthesiologists Patient Classification E Emergency status This is added to the ASA designation only if the patient is undergoing an emergency procedure. Example: a healthy patient undergoing sedation for reduction of a displaced fracture would be an ASA 1E

Summary of Fasting Recommendations to Reduce the Risk of Pulmonary Aspiration Ingested Material Minimum Fasting Period (hours) – Clear liquids 2 – Breast milk 4 – Infant formula 6 – Non-human milk 6 – Light meal 6

Risk factors for DVT Age >40 years Obesity Varicose veins High oestrogen pill Previous DVT or PE Malignancy Infection Heart failure / recent infarction Polycythaemia /thrombophilia Immobility ( bed rest over 4 days) Major trauma

Risk factors for DVT

Prophylaxis against DVT

Routine Preoperative care for the Adult Patient 1. Avoid taking aspirin or aspirin-containing products for 2 weeks prior to surgery unless approved by physician 2. Discontinue nonsteroidal anti-inflammatory medications 48 to 72 hours before surgery

3. Bring a list or container of current medications 4. Bring an adult escort who can drive if they are having an outpatient procedure with sedation or general anesthesia 5. Wear loose clothing that can easily be removed (eg, avoid clothing that pulls on and off over the head)

Routine Preoperative care for the Adult Patient 6. Instruct the patient to bathe/shower/shampoo the evening before or morning of surgery. Men should be cleanly shaved.

Routine Preoperative care for the Adult Patient 7. Instruct the patient on oral intake restrictions and medication schedule as ordered: a. NPO after midnight (including water) b. NPO after clear liquid or light breakfast if permitted c. AM meds with sip of water if ordered by physician/anesthesiologist

before going to the operating room he/she will have to remove: 1. Dentures/partial plates 2. Glasses/contact lenses 3. Appliances/prosthesis 4. Makeup/nail polish 5. Hairpins/hairpiece 6. Undergarments