1.1 Patient Health History, Physical Assessment & Medication Reconciliation

Patient Health History, Physical Assessment & Medication Reconciliation

Core Principle: In freestanding ambulatory surgery centers (ASCs), the preoperative health assessment is the primary clinical safety barrier separating successful same-day discharge from catastrophic intraoperative emergencies or unplanned hospital transfers. Because freestanding facilities lack overnight intensive care units, emergency response teams, and immediate on-site blood banks, the ambulatory perioperative nurse must execute rigorous, proactive risk stratification and medication reconciliation.

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The Ambulatory Surgery Context & Pre-Admission Screening

Ambulatory surgical care operates under high-efficiency workflows where rapid patient turnover must never compromise patient safety. Pre-admission screening (PAS) ideally begins 3 to 7 days prior to the scheduled operative date through structured telephonic or electronic health record (EHR) interviews, followed by an in-person, hands-on clinical baseline evaluation on the day of surgery.

The primary goals of the ambulatory preoperative assessment include:

1. Verifying Candidacy for Ambulatory Surgery: Confirming that the patient's acute surgical condition and underlying chronic comorbidities fit within the scope of care approved by the facility's credentialing and governing board.
2. Identifying Modifiable Physiological Risks: Uncovering unrecognized organ dysfunction, unstable cardiovascular disease, active infections, or malignant hyperthermia susceptibility.
3. Establishing Objective Physiological Baselines: Documenting resting vital signs, cognitive orientation, neurological status, skin integrity, and pain scores to serve as benchmarks for post-anesthesia recovery scoring (Aldrete and Post-Anesthesia Discharge Scoring System [PADSS]).
4. Preventing Day-of-Surgery Cancellations: Validating compliance with preoperative fasting (NPO guidelines), medical clearance recommendations, and medication withholding protocols.

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Baseline Vital Signs & Review of Systems (ROS)

Vital signs obtained upon admission establish the physiological benchmark for the entire perioperative episode. Any significant deviation from normal adult resting ranges warrants immediate investigation.

Systematic Review of Systems (ROS)

• Cardiovascular System: Evaluate functional capacity using Metabolic Equivalents (METs). A patient unable to achieve 4 METs (e.g., climbing a flight of stairs, walking briskly up a hill, or carrying groceries) carries an elevated risk of perioperative myocardial infarction. Inquire about coronary stents and the indication and date of PCI. Current perioperative guidance generally delays elective noncardiac surgery requiring antiplatelet interruption for at least 12 months after a drug-eluting stent placed for acute coronary syndrome and at least 6 months after a drug-eluting stent placed for chronic coronary disease; time-sensitive surgery may be considered at 3 months in selected cases. Surgery requiring interruption within 30 days of any recent stent is particularly hazardous. Coordinate all decisions with anesthesia, surgery, and cardiology.
• Respiratory System: Screen for asthma, chronic obstructive pulmonary disease (COPD), and smoking history. Specifically assess for any recent upper respiratory tract infection (URI) within the preceding 2 to 4 weeks. Active or recent viral URIs induce airway hyperreactivity that persists for up to 6 weeks, increasing the risk of perioperative laryngospasm, bronchospasm, and post-intubation desaturation by 2- to 5-fold, particularly in pediatric patients.
• Neurological & Musculoskeletal: Document baseline cognitive function, sensory-motor deficits, and joint limitations to guide regional block safety and prevent positional neuropraxia during surgical positioning.
• Endocrine & Renal: Inquire regarding diabetes mellitus, end-stage renal disease (ESRD), and hemodialysis schedules. For hemodialysis patients, surgery should ideally be scheduled on the day after dialysis (when fluid and electrolyte balances are optimal) and never immediately post-dialysis when systemic heparin remains active.

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Systematic Airway Assessment in Ambulatory Surgery

Airway complications represent the leading cause of anesthesia-related morbidity and mortality in outpatient surgery. Freestanding ASCs must be equipped with advanced airway infrastructure (video laryngoscopes, supraglottic rescue airways, surgical cricothyrotomy kits), but the perioperative nurse's frontline physical exam serves as the primary early warning system.

The Mallampati Classification

The Mallampati score evaluates the size of the tongue relative to the oral cavity, assessed with the patient seated upright, head in neutral position, mouth opened wide, and tongue fully protruded without phonation:

• Class I: Soft palate, fauces, uvula, and anterior and posterior tonsillar pillars are completely visible. Predicts easy visualization of the glottis.
• Class II: Soft palate, fauces, and uvula are visible; tonsillar pillars are hidden by the base of the tongue.
• Class III: Soft palate and base of the uvula are visible; uvular tip and pillars are completely obscured. Predicts moderate-to-high intubation difficulty.
• Class IV: Only the hard palate is visible; the soft palate is entirely obscured by the tongue base. Strong predictor of difficult direct laryngoscopy and mask ventilation.

Anatomical Measurements & Physical Airway Markers

• Thyromental Distance (TMD): Measured from the thyroid notch (Adam's apple) to the inner border of the mandibular mentum with the neck fully extended. A distance greater than 6.5 cm (approximately three adult fingerbreadths) is normal. A TMD less than 6.0 cm indicates an anterior larynx and a recessed mandible, preventing alignment of the pharyngeal and laryngeal axes during direct laryngoscopy.
• Sternomental Distance: Measured from the superior border of the manubrium sterni to the mentum with neck extended; values <12.5 cm correlate with difficult intubation.
• Inter-Incisor Distance (Mouth Opening): Normal opening is ≥4 cm (three fingerbreadths). An inter-incisor gap <3 cm precludes conventional laryngoscopic blade insertion.
• Cervical Spine Mobility: Normal atlanto-occipital extension is ≥35 degrees. Marked limitation (seen in severe cervical spondylosis, rheumatoid arthritis, prior spinal fusion, or ankylosing spondylitis) prevents the "sniffing position" necessary for direct vocal cord visualization.
• Dentition & Maxillofacial Anatomy: Document loose, chipped, capped, or missing teeth, permanent bridges, prominent maxillary incisors ("overbite"), micrognathia (receded chin), and macroglossia.

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Preoperative Anticoagulation, Antiplatelet & Herbal Management

Managing hemostasis requires balancing the catastrophic risk of perioperative surgical hemorrhage against the life-threatening hazard of arterial or venous thromboembolism. The perioperative nurse must reconcile every prescription, over-the-counter (OTC), and herbal compound.

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GLP-1 Receptor Agonists and Current Risk-Stratified Guidance

GLP-1 receptor agonists and dual GIP/GLP-1 agents can delay gastric emptying, but the current multi-society approach does not require a universal day-of-surgery or seven-day hold. Most patients may continue therapy. The team instead identifies patients at greatest risk of retained gastric contents: those in dose escalation, those with significant nausea, vomiting, abdominal pain, constipation, or bloating, those receiving higher doses, and those with another disorder that slows gastric emptying.

For an elevated-risk patient, the prescriber, surgeon, and anesthesia professional jointly weigh metabolic harm from withholding the drug against aspiration risk. Mitigation may include a liquid-only diet for 24 hours, point-of-care gastric ultrasound when available and the clinician is trained, modification of the anesthesia plan to reduce aspiration risk, or postponement when symptoms or escalation-phase risk are expected to improve. The nurse documents the medication, indication, dose, last dose, escalation status, symptoms, fasting intake, and the team’s decision. Do not independently discontinue diabetes therapy; coordinate glycemic management when a drug is withheld.

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Medication Reconciliation & Morning-of-Surgery Guidelines

The Joint Commission's National Patient Safety Goal (NPSG 03.06.01) requires accredited ambulatory surgery centers to maintain a formal, standardized medication reconciliation process across transitions of care. The perioperative nurse must compare the patient's comprehensive home medication list against the physician's perioperative orders to resolve discrepancies, duplications, and omissions.

Day-of-Surgery Medication Administration Protocol

Patients should take approved morning medications with a minimal sip of clear water (<30 mL / 1 ounce) at least 2 hours prior to scheduled arrival.

┌────────────────────────────────────────────────────────────────────────┐
│               MORNING-OF-SURGERY MEDICATION PROTOCOL                   │
├────────────────────────────────────┬───────────────────────────────────┤
│       TAKE (WITH SIP OF WATER)     │               HOLD                │
├────────────────────────────────────┼───────────────────────────────────┤
│ • Beta-Blockers (e.g., Metoprolol) │ • ACE Inhibitors (e.g., Lisinopril│
│   (Prevents rebound tachycardia)   │ • ARBs (e.g., Losartan)           │
│ • Calcium Channel Blockers         │   (Prevents profound vasoplegia)  │
│ • Anticonvulsants (e.g., Dilantin) │ • Diuretics (e.g., Furosemide)    │
│ • Statins (e.g., Atorvastatin)     │   (Prevents severe hypovolemia)   │
│ • Thyroid Hormone (Levothyroxine)  │ • Oral Hypoglycemics (Metformin)  │
│ • Acid Reducers (H2 blockers, PPIs)│ • SGLT2 Inhibitors (Hold 3-4 days)│
│ • Inhaled Bronchodilators / Steroids│ • SGLT2 inhibitors 3-4 days prior  │
└────────────────────────────────────┴───────────────────────────────────┘

• Beta-Adrenergic Blockers (e.g., Metoprolol, Atenolol): Must be continued on the morning of surgery. Abrupt withdrawal causes acute rebound sympathetic hypertension, tachycardia, and a 4-fold increase in perioperative myocardial infarction.
• ACE inhibitors and ARBs: Follow the authorized anesthesia and prescribing plan. Withholding about 24 hours before elevated-risk surgery may reduce intraoperative hypotension when the indication is hypertension, while continuation may be reasonable for heart failure with reduced ejection fraction. Avoid a universal rule divorced from indication and patient risk.
• Diuretics: Management is individualized. A morning dose may be withheld when hypovolemia or electrolyte disturbance is the concern, but patients using diuretics for heart failure or volume control require a specific plan rather than automatic omission.
• Sodium-Glucose Cotransporter-2 (SGLT2) Inhibitors (e.g., Empagliflozin, Dapagliflozin): Must be discontinued 3 to 4 days prior to surgery. SGLT2 inhibitors induce glucosuria and can trigger life-threatening euglycemic diabetic ketoacidosis (euDKA) under perioperative surgical stress, where severe ketoacidosis develops despite normal or only mildly elevated blood glucose levels (<250 mg/dL).