Reduction of Risk Potential: Practice Questions & Explanations

CARDIAC CATHETERIZATION via FEMORAL ARTERY ACCESS introduces a large catheter into the femoral artery. After removal, a small hole is left in a major artery — HEMORRHAGE and VASCULAR COMPLICATIONS are the primary post-procedure risks.

Priority post-procedure assessments:

Site inspection: bleeding (check directly and under the client — blood can pool under the client undetected); hematoma (expanding lump/discoloration at site — concerning if rapidly enlarging or causing neurovascular compromise).

Note: femoral access requires the client to keep the leg STRAIGHT and LIMIT movement for the prescribed period (typically 2-6 hours depending on closure method); VASCULAR STATUS of the affected extremity: PULSES (dorsalis pedis and posterior tibial pulses distal to the site — check every 15 minutes initially).

Circulation: COLOR (pale = arterial occlusion; cyanotic = venous obstruction); TEMPERATURE (should be warm — cold = reduced perfusion); CAPILLARY REFILL (<3 seconds = adequate); SENSATION AND MOVEMENT (numbness, tingling, weakness = neurovascular compromise).

Frequency: typically every 15 minutes for the first hour, every 30 minutes for the next hour, then every hour.

Complications to detect:

Bleeding: may be external or internal (retroperitoneal hematoma — may not be visible but presents with flank/back pain, hypotension, tachycardia, dropping H&H).

Arterial occlusion: absent or diminished distal pulse, pain, pallor, paresthesia, paralysis — 'the 5 P's of arterial occlusion'.

Pseudoaneurysm: pulsatile mass at site.

Arteriovenous fistula: palpable thrill at site.

Vasovagal: hypotension, bradycardia, nausea.

Report to RN: any absent or diminishing distal pulse; expanding hematoma; bleeding that doesn't stop with pressure; hypotension or tachycardia; extremity pallor, cyanosis, or coldness.

HYPOKALEMIA is defined as serum potassium below 3.5 mEq/L. Normal range: 3.5-5.0 mEq/L. A level of 2.9 mEq/L is SIGNIFICANTLY LOW and clinically concerning.

Clinical manifestations of hypokalemia:

Cardiac: most dangerous; PVCs (premature ventricular contractions); U WAVES on ECG (prominent — a U wave following the T wave is a classic ECG sign of hypokalemia); flattened T waves; prolonged QU interval; progression to ventricular tachycardia or ventricular fibrillation if severe.

Muscles: muscle weakness (legs first, ascending); muscle cramps; PARALYTIC ILEUS (lack of bowel sounds, abdominal distension, constipation); respiratory muscle weakness with very low K+.

Neurological: fatigue, lethargy, confusion.

Renal: polyuria (paradoxically, hypokalemia impairs the kidney's ability to concentrate urine).

Causes of hypokalemia: loop and thiazide diuretics (most common); vomiting; nasogastric suction; diarrhea; sweating; poor dietary intake; increased renal excretion (hyperaldosteronism, Cushing's syndrome); alkalosis (K+ shifts into cells).

Treatment: ORAL POTASSIUM REPLACEMENT (KCl tablets or liquid — better absorbed with food; GI irritating).

IV potassium: NEVER push IV K+ directly — can cause cardiac arrest; dilute in IV fluids (typically no more than 10-20 mEq/hr via peripheral line; higher concentrations require central line); cardiac monitoring during IV K+ administration.

Dietary sources: bananas, oranges, potatoes, leafy greens, tomatoes, beans. HYPERKALEMIA (contrast): K+ >5.0 mEq/L; PEAKED (TALL TENT) T WAVES on ECG; widened QRS; cardiac arrest risk; muscle weakness; causes: renal failure, ACE inhibitors, potassium-sparing diuretics, acidosis.

Pn role: report abnormal K+ immediately; administer replacement per order; monitor ECG; assess for symptoms; teach dietary sources.

Nasogastric tube feeding safety: confirming tube placement BEFORE each feeding is a CRITICAL PATIENT SAFETY STEP. A misplaced tube (in the respiratory tract) with feeding infusion can cause ASPIRATION, PNEUMONIA, and potentially DEATH.

Tube placement verification: RECOMMENDED — ASPIRATION AND pH TESTING: aspirate gastric contents; gastric contents have pH < 5 (acidic); intestinal fluid is 6-8; respiratory fluid is >7; confirm pH before each feeding; AUSCULTATION OF AIR ('whoosh' test — inserting air and listening) is NOT RELIABLE as a primary confirmation method and should not be used as the sole method — bowel sounds can be transmitted to the respiratory tract; RADIOGRAPHY (X-RAY): GOLD STANDARD for initial placement confirmation — mandatory after initial NG tube insertion; visual confirmation of tube tip in the stomach.

After initial x-ray confirmation: subsequent checks before each feeding use pH and aspiration.

Checking residual: after confirming placement, aspirate to measure GASTRIC RESIDUAL VOLUME (GRV) — how much feeding remains from previous feeding; high residual (typically >250-500 mL, per facility policy) may indicate delayed gastric emptying; follow facility protocol (may hold feeding, notify RN, or continue feeding depending on clinical situation); replace aspirate to avoid losing gastric acid and electrolytes.

Additional safety measures:

Position: elevate HOB 30-45° during feeding and 30 minutes after to reduce aspiration risk.

Rate: start slowly, advance per orders.

Flushing: flush tube with 30 mL water before and after feeding and medications; ASSESS for ASPIRATION SIGNS: coughing, choking, desaturation, respiratory distress.

Pn role: verify placement per protocol; check residual; position client; administer feeding as ordered; monitor for complications; flush appropriately.

FASTING BLOOD GLUCOSE test measures blood glucose after an adequate fasting period and is used to: SCREEN for diabetes (fasting glucose ≥126 mg/dL on two separate occasions = diabetes); DIAGNOSE impaired fasting glucose (prediabetes: 100-125 mg/dL); MONITOR glycemic control in known diabetics (less commonly than A1c now, but still used).

Fasting requirements: nothing to eat or drink (except WATER) for 8-12 hours before the test; water is allowed and encouraged (does not affect glucose; prevents dehydration which can concentrate the sample); no food, juice, coffee, milk, or caloric beverages; smoking may affect results (advise against).

Medication considerations: most oral medications can be taken with a small sip of water unless specifically contraindicated; insulin-dependent diabetics should hold morning insulin dose UNLESS fasting glucose is known (hypoglycemia risk); specific instructions from the provider take precedence.

Common lab tests and their requirements: FASTING (nothing except water, 8-12 hours): blood glucose, HbA1c (no special requirements actually, but many labs draw it fasting), lipid panel, iron studies.

No special prep: CBC, electrolytes, BMP, CMP (though many labs prefer early morning).

Timed samples: cortisol (AM/PM), ACTH, morning cortisol best drawn 8 AM.

Pn role: provide clear verbal AND written instructions; confirm the client understood (teach-back); document that instructions were given; confirm appointment time and location; advise the client to bring their glucose monitor if diabetic; if the client accidentally ate, inform the lab and the ordering provider before drawing — the fasting interpretation cannot be applied.

POST-THYROIDECTOMY COMPLICATIONS require vigilant monitoring in the immediate post-operative period.

Two priority concerns: (1) HYPOCALCEMIA / HYPOPARATHYROIDISM: The parathyroid glands (4 tiny glands on the posterior thyroid) are at risk of damage or inadvertent removal during thyroidectomy; if parathyroid function is lost, calcium regulation is disrupted; hypocalcemia develops within 24-72 hours; signs and symptoms: tingling/numbness around mouth and in extremities; POSITIVE TROUSSEAU'S SIGN (carpal spasm when BP cuff inflated above systolic for 3 minutes); POSITIVE CHVOSTEK'S SIGN (facial twitching when tapping facial nerve); muscle cramps; tetany; SEIZURES in severe hypocalcemia.

Treatment: IV calcium gluconate; oral calcium and vitamin D supplements long-term; (2) HEMORRHAGE AND AIRWAY COMPROMISE: The thyroid is highly vascular; bleeding into the surgical site can cause rapid hematoma expansion in the confined neck space; the hematoma can compress the trachea causing airway obstruction — this is a SURGICAL EMERGENCY; signs: rapidly expanding neck swelling; stridor; dyspnea; tracheal deviation.

Treatment: Emergency wound opening at the bedside if acute obstruction (emergency supplies kept at bedside); surgical return to OR.

Other complications: Laryngeal nerve damage causing hoarseness (recurrent laryngeal nerve injury — assessed by voice quality); thyroid storm if inadequately prepared pre-operatively.

POST-OPERATIVE URINARY RETENTION ASSESSMENT:

Normal: Most patients void within 6-8 hours after surgery.

Assessment first: Before inserting a catheter (invasive procedure), assess: palpate suprapubic area for distension and firmness; ask if patient feels urge to void; review total fluid intake (IV + oral) since surgery.

Bladder scanner: If available, perform bladder scan to quantify volume (>300-400 mL with inability to void = retention).

Conservative interventions: Offer bedpan or urinal in a private, comfortable position; run water audibly; apply warm compress to suprapubic area; ambulate to the bathroom if safe and ordered.

Catheterization threshold: Typically if conservative measures fail AND bladder volume >500 mL OR patient has significant discomfort.

Common causes: Anesthesia (bladder relaxation); opioid medications (urethral sphincter tone increased); lying flat (difficult to void for many people); anxiety.

Pn scope: Assess, implement conservative measures, report to RN for catheterisation orders.

Dvt recognition and initial response:

Classic dvt signs: Unilateral (one leg) calf pain; warmth; swelling (may see difference in leg circumference); redness; may be accompanied by low-grade fever; HOMAN'S SIGN (calf pain on dorsiflexion): historically taught but is UNRELIABLE and NOT recommended for diagnosis — but these symptoms together in a bedridden patient = high clinical suspicion.

Critical danger: If the thrombus (clot) dislodges from the calf vein, it travels up to the vena cava to the right heart to the pulmonary vasculature = PULMONARY EMBOLISM — potentially fatal.

Never massage: Massaging, pressing, or squeezing the area of a suspected DVT can cause embolisation.

Pn priority: DO NOT TOUCH OR MANIPULATE THE CALF; IMMEDIATELY notify the RN; immobilize the leg.

Anticipated orders: Duplex ultrasound of the leg (diagnostic); anticoagulation (heparin) if confirmed; elevation of leg with caution.

POST-OPERATIVE FEVER — TIMING-BASED APPROACH: DAY 1 (within 24 hours): ATELECTASIS (collapsed lung segments) is the most common cause; wound infections at this stage are nearly impossible (too early for bacteria to proliferate);

Treatment: Incentive spirometry (10 deep breaths every hour); early ambulation; pain management to allow deep breathing.

Day 3-5: WIND (pneumonia), WATER (urinary tract infection from catheter), WOUND (surgical site infection beginning to develop), WALKING (DVT/PE).

Day 5-7: WOUND infection peaks; IV site infection (phlebitis, catheter infection); DEEP VEIN THROMBOSIS fever; LATE (weeks): Internal abscess, deep wound infection.

Incentive spirometry rationale: Surgery + anesthesia → splinting (shallow breathing from pain) + reduced respiratory drive → alveolar collapse → microatelectasis → fever as inflammatory response + bacterial colonisation of collapsed areas → pneumonia if untreated. Early ambulation and breathing exercises prevent this cascade.

Post-lumbar puncture care:

Positioning: Flat (supine or prone) 4-8 hours per order — the evidence for preventing post-LP headache with positioning has evolved (some studies suggest not clearly beneficial) but most institutions still recommend flat positioning; the rationale: CSF leaks through the dural puncture site when upright; lying flat reduces pressure differential.

Post-lp headache: Most common complication; worst when upright, relieved when flat; typically occurs 24-48 hrs post-procedure.

Treatment: Fluids (increases CSF production); caffeine (vasoconstrictive, reduces headache); blood patch (definitive treatment if severe — autologous blood injected at puncture site to seal the leak).

Monitoring: Vital signs; neurological status; headache assessment; check puncture site for CSF leak or haematoma.

Additional post-lp care: Encourage PO fluids if not restricted; monitor sensation/movement in lower extremities; report any numbness, weakness, or bowel/bladder changes immediately.

Oral iron supplementation teaching:

Most common adverse effect: GI distress — nausea, constipation, stomach cramps; dark/black stools (expected, not a sign of GI bleeding unless bright red).

Managing gi effects: Take with small amount of food to reduce nausea (reduces absorption slightly but improves adherence); increase fluid and fibre intake; stool softener may be ordered; start at lower dose and increase gradually.

Maximising absorption: Vitamin C (ascorbic acid) significantly increases iron absorption — orange juice, tomato juice, or vitamin C supplement with the dose; avoid coffee, tea, milk, calcium supplements, antacids within 2 hours (inhibit absorption).

Different formulations: Ferrous sulphate (most common); ferrous gluconate (more expensive, gentler on GI).

Liquid form: Use a straw to prevent tooth staining.

Patient education: Expected black stools; expected mild GI upset initially; do not stop without notifying provider; takes 4-8 weeks to see improvement in fatigue/haemoglobin.

Post-thyroidectomy complications:

Hypocalcaemia: Parathyroid glands (regulate calcium) may be inadvertently removed or devascularised during thyroid surgery.

Earliest signs: Perioral tingling, finger and toe numbness/tingling; CHVOSTEK'S SIGN: Tap the facial nerve at the cheek — positive if facial muscles twitch (abnormal); TROUSSEAU'S SIGN: Blood pressure cuff inflated above systolic — positive if carpopedal spasm occurs.

Progression: Muscle cramps → tetany → laryngospasm (airway emergency) → seizures → cardiac dysrhythmias.

Nursing response: Notify RN immediately; anticipate: serum calcium level; IV calcium gluconate at bedside; cardiac monitoring.

Additional post-thyroid monitoring: Airway patency (haematoma can compress the trachea); hoarseness (recurrent laryngeal nerve injury — if worsening, notify); thyroid storm (rare — fever, tachycardia, hypertension, agitation).

Nursing scope: Assess for all post-op complications; be prepared for airway emergency (tracheotomy tray at bedside for first 24 hrs per facility protocol).

Air embolism:

Cause: Air enters the central venous system through the central line during tubing changes, disconnections, or catheter removal.

Signs: Sudden onset dyspnoea, chest pain, decreased SpO2, tachycardia, 'millwheel' murmur (churning sound from air in heart).

Emergency response: CLAMP the line immediately to stop further air entry; LEFT LATERAL TRENDELENBURG (Durant's manoeuvre): Positions the right atrium above the right ventricular outflow tract — traps air in the right atrium rather than allowing it to obstruct the pulmonary outflow.

Oxygen: High-flow 100% O2 (increases nitrogen washout — air is primarily nitrogen).

Call for help: This is a life-threatening emergency.

Prevention: Keep all central line connections Luer-locked; use air-elimination filters; have patient hold breath during tubing changes (Valsalva manoeuvre); use chlorhexidine prep and technique to minimise opening time.

Comparison: Pneumothorax (from central line insertion) presents differently — unilateral breath sounds, tracheal deviation, diagnosed by CXR.

CAUTI PREVENTION (one of the most common healthcare-associated infections):

Key measures: Keep drainage bag BELOW bladder level (prevents backflow of contaminated urine); maintain a CLOSED drainage system (don't disconnect unnecessarily); secure the catheter to prevent movement and urethral trauma; daily perineal hygiene with soap and water; ensure unobstructed urine flow (no kinks/dependent loops).

Early removal: The single most effective CAUTI prevention is removing the catheter as soon as it's no longer medically necessary — each catheter day increases infection risk.

Avoid: Routine catheter irrigation (introduces pathogens); routine catheter changes (unnecessary manipulation); breaking the closed system.

LPN role: Maintain the system, monitor for infection signs (cloudy/foul urine, fever, suprapubic pain), advocate for removal during rounds.

HYPOGLYCEMIA TREATMENT — THE 15-15 RULE: For a CONSCIOUS client able to swallow with blood glucose < 70 mg/dL: GIVE 15g fast-acting carbohydrate: 4 oz (1/2 cup) fruit juice or regular soda; 3-4 glucose tablets; 1 tablespoon honey or sugar; 8 oz milk; WAIT 15 minutes; RECHECK blood glucose; REPEAT if still < 70; Once normalized, provide a complex carb + protein snack if next meal is > 1 hour away (prevents rebound hypoglycemia); UNCONSCIOUS or unable to swallow: Do NOT give oral anything (aspiration risk); give IM/SubQ glucagon or IV dextrose (D50); NEVER give insulin to a hypoglycemic patient — insulin lowers glucose further; HOLD scheduled insulin and notify provider when glucose is low;

Hypoglycemia signs: shakiness, sweating, tachycardia, hunger, confusion, irritability; severe: seizures, loss of consciousness; LPN role: recognize and treat per protocol, recheck, notify RN.

C. DIFF HAND HYGIENE — A CLASSIC NCLEX POINT: C. difficile forms SPORES that are resistant to alcohol — alcohol-based hand sanitizers do NOT kill C. diff spores; SOAP AND WATER required — the mechanical action of washing physically removes spores from hands; ALWAYS wash with soap and water before and after C. diff patient contact, even if gloves were worn (gloves can have micro-tears, and removal can contaminate hands); CONTACT PRECAUTIONS for C. diff: gown and gloves; dedicated equipment; private room (or cohort with other C. diff patients);

Environmental cleaning: C. diff spores survive on surfaces — use a sporicidal agent (bleach-based) for room cleaning (regular disinfectants don't kill spores).

Transmission: Fecal-oral; spores spread via contaminated hands and surfaces.

Risk factors: Recent antibiotic use (disrupts normal gut flora), hospitalization, advanced age; this soap-vs-sanitizer distinction is tested on nearly every NCLEX exam.

Home fall prevention:

Environmental modifications: Remove throw rugs (major trip hazard) or secure with non-slip backing; Adequate lighting throughout, especially night lights from bed to bathroom (most home falls happen at night going to the bathroom); Install grab bars in bathroom (near toilet and in shower/tub); non-slip mats in tub/shower; Keep walkways clear of clutter, cords, and furniture; Handrails on both sides of stairs; Keep frequently used items within easy reach.

Personal measures: Non-slip footwear (not socks alone, not loose slippers); rise slowly (orthostatic hypotension); use assistive devices as prescribed (cane, walker); medication review (sedatives, antihypertensives, diuretics increase fall risk).

Fall statistics: Falls are the leading cause of injury death in adults 65+; hip fractures from falls carry high morbidity and mortality; LPN role: provide home safety teaching, identify fall risk factors, recommend modifications and PT/OT referral.