Cardiac catheterization nursing: pre-, peri-, and post-procedure care

Cardiac catheterization is an invasive cardiac procedure in which a flexible catheter is threaded into the coronary arteries or heart chambers via femoral or radial arterial access. Nurses manage preparation, monitoring, and recovery. The post-procedure phase — particularly site assessment, vascular integrity, and contrast clearance — is where nursing judgment has the greatest impact on patient outcomes. This guide covers every step: what the procedure involves, how femoral and radial access differ, how to prepare the patient, what to watch for during and after the procedure, and how to teach the patient before discharge.

Quick-reference summary

What cardiac catheterization is

Cardiac catheterization is both a diagnostic tool and a treatment platform. A cardiologist inserts a catheter through an arterial access point — the femoral artery in the groin or the radial artery at the wrist — and advances it under fluoroscopic guidance to the coronary arteries or heart chambers.

Diagnostic uses:

• Coronary angiography — iodine-based contrast dye is injected through the catheter to visualize coronary artery anatomy and identify stenoses or occlusions. This is the gold standard for diagnosing coronary artery disease (CAD).
• Left heart catheterization — measures pressures inside the left ventricle and across the aortic valve; assesses ejection fraction; evaluates valvular disease.
• Right heart catheterization — a separate procedure using a Swan-Ganz catheter advanced through venous access to measure pulmonary artery pressures and cardiac output. Often used in heart failure workup.

Interventional uses:

• Percutaneous coronary intervention (PCI) — umbrella term for procedures that restore coronary blood flow. Includes balloon angioplasty and stent placement.
• Percutaneous transluminal coronary angioplasty (PTCA) — a balloon catheter is inflated at the stenosis to compress plaque against the arterial wall and widen the lumen.
• Coronary stenting — a mesh metallic stent (bare metal or drug-eluting) is deployed at the site of the lesion after PTCA to scaffold the vessel open and reduce re-stenosis. Drug-eluting stents (DES) release antiproliferative agents (paclitaxel, sirolimus) to minimize smooth muscle re-growth.
• Primary PCI — emergency PCI performed during an ST-elevation myocardial infarction (STEMI) to re-open the culprit artery. Door-to-balloon time under 90 minutes is the target.

The nurse’s role spans from pre-procedure preparation through post-procedure recovery, and is distinct from — but coordinated with — the cardiologist and cath lab technician roles.

Femoral vs radial access — comparison

Allen test for radial access: Before radial catheterization, the cardiologist performs an Allen test to confirm ulnar collateral perfusion. The nurse should understand the purpose: both radial and ulnar arteries are occluded simultaneously; radial pressure is released; if the hand flushes pink within 5–7 seconds, ulnar collateral flow is adequate and radial access is safe. A modified Allen test using pulse oximetry is also used. A failed Allen test means the patient should not have radial access on that side.

Pre-procedure nursing preparation

Thorough preparation prevents procedural complications. Complete the following before the patient leaves the floor.

History and assessment

• Allergies — ask specifically about iodine contrast dye, shellfish (high-iodine content correlates with contrast reaction risk), povidone-iodine (Betadine), latex, and all medications. Document allergy type and reaction.
• Contrast allergy pre-medication — patients with prior contrast reactions typically receive a corticosteroid + antihistamine protocol (e.g., prednisone 50 mg PO 13h, 7h, and 1h before; diphenhydramine 50 mg IV/IM 1h before; some protocols add a H2 blocker). Confirm orders are written and administered.
• Renal function — obtain baseline BMP/CMP. Creatinine and eGFR before contrast exposure are critical. Notify cardiologist of elevated creatinine — pre-hydration protocol may be ordered (normal saline 1 mL/kg/h starting 12h before and continuing 6–12h after; or sodium bicarbonate protocol per facility policy). Contrast-induced nephropathy (CIN) risk rises sharply when eGFR falls below 30.
• Anticoagulation review — note all anticoagulants and antiplatelet agents. Warfarin is often held several days pre-procedure (target INR <1.8 or per cardiologist order). Novel oral anticoagulants (DOACs) — apixaban, rivaroxaban, dabigatran — are typically held 24–48 hours. Aspirin and P2Y12 inhibitors (clopidogrel, ticagrelor, prasugrel) may be continued or pre-loaded depending on whether PCI is anticipated — clarify with cardiology.
• Metformin — hold metformin on the day of the procedure and for 48 hours after contrast exposure. Contrast dye reduces renal clearance of metformin, increasing the risk of lactic acidosis. Restart only after renal function is confirmed stable. (See Contrast section below.)
• Baseline assessment — bilateral radial pulses, bilateral pedal pulses (mark with pen if faint), baseline neurological status, and skin assessment at the access site.
• Peripheral IV access — 18-gauge or larger catheter (20-gauge minimum), typically in the antecubital fossa of the non-dominant arm (or non-access arm for radial cases). IV patency is essential for moderate sedation and emergency medication access. See the IV insertion guide for placement technique.
• Cardiac monitoring — place ECG leads and confirm monitoring is active before transport.

Consent and communication

• Confirm informed consent is signed and dated.
• Verify the patient understands the procedure, sedation plan, and possible complications.
• Confirm the patient has a responsible adult for transport and overnight monitoring if going home same-day.

NPO status

Standard NPO is typically 4–8 hours before the scheduled procedure time (clear liquids may be permitted up to 2 hours before per anesthesia guidelines, but confirm with your facility protocol). NPO reduces aspiration risk during moderate sedation.

Site preparation

• Clip — do not shave — hair at the access site (groin for femoral, wrist for radial). Shaving creates micro-abrasions that increase infection risk.
• Clean the site with chlorhexidine gluconate per facility policy.
• Remove nail polish from fingers of the access hand (radial) to allow pulse oximetry readings post-procedure.

Bladder preparation

Encourage the patient to void before going to the cath lab. Prolonged bed rest after femoral access makes voiding difficult, and a distended bladder is uncomfortable during recovery. Some patients receive a urinary catheter if a prolonged or complex procedure is anticipated; this is typically a cardiologist/anesthesia decision.

Intraoperative nursing role

Most cardiac catheterizations are performed in a dedicated catheterization laboratory. Floor nurses are not typically present in the cath lab. However, nurses who work in cath lab settings, cardiac step-down units receiving patients from the lab, or who send patients to the lab should understand what happens during the procedure.

In the cath lab, the circulating nurse or cath lab nurse:

• Reviews allergies, consent, and pre-medication administration before the patient enters.
• Places monitoring leads, pulse oximetry, and a blood pressure cuff (on the non-access arm).
• Establishes a second large-bore IV if needed.
• Administers moderate sedation agents (midazolam, fentanyl — or per anesthesia protocol) and monitors level of consciousness, respiratory status, and vital signs throughout.
• Assists the cardiologist in sterile draping of the access site.
• Documents contrast volume administered (cumulative load affects nephropathy risk).
• Monitors the ECG for ischemic changes during contrast injection or balloon inflation (transient ST elevation during balloon inflation is expected; persistent changes are not).
• Has emergency medications and a defibrillator immediately available. Ventricular fibrillation can occur during contrast injection into the right coronary artery. See cardioversion and defibrillation nursing for emergency cardioversion readiness.
• Communicates with the patient throughout — reassuring, monitoring for contrast reaction symptoms (flushing, throat tightening, urticaria).
• At procedure end, oversees sheath removal or dressing/band application and prepares the patient for transport.

Post-procedure nursing care — femoral access

The femoral post-procedure period demands systematic assessment. Vascular complications at the femoral access site are the leading cause of post-cath morbidity.

Sheath management and hemostasis

Arterial sheaths are typically 5–8 French. Sheath removal and hemostasis may be achieved by:

1. Manual compression — direct firm pressure applied to the femoral access site for 15–20 minutes after sheath removal. The nurse or cardiologist applies pressure 1 cm above the skin puncture site (over the vessel itself, not just the skin entry point). After release, inspect every 5–10 minutes for re-bleeding or hematoma formation.

2. Mechanical compression device — a FemoStop or C-clamp device applies regulated pressure over the puncture. The nurse manages the device — confirm correct placement over the vessel, adjust pressure as ordered, and follow facility deflation protocol.

3. Vascular closure devices — Angioseal (collagen plug + anchor), Perclose (suture-mediated closure), and StarClose (nitinol clip) allow earlier ambulation by achieving hemostasis at the time of sheath removal in the lab. Post-procedure, still assess the site — closure devices can fail, thrombose, or cause local inflammation. The cardiologist will document which device was used.

Positioning and bed rest

• Patient lies flat or with head of bed ≤30° until the designated bed rest period ends.
• The affected leg must remain straight — no hip flexion greater than 30°. Hip flexion kinks the femoral artery and risks re-bleeding.
• Instruct the patient not to raise the head independently (which engages abdominal muscles) and not to bend the knee on the access side.
• Bed rest duration: typically 2–6 hours depending on sheath size, anticoagulation status, and whether a closure device was used. Closure devices typically allow ambulation at 1–2 hours; manual compression sites typically require 4–6 hours.

Groin assessment: recognizing vascular complications

Assess the groin site with each vital sign check (Q15min × 4, Q30min × 2, Q1h until stable). Look for:

Distal pulse and circulation assessment

Check the dorsalis pedis (top of foot) and posterior tibial (posterior to medial malleolus) pulses on the access side with every vital sign check. Compare to the contralateral (non-access) leg and to the baseline documented before the procedure. Use a Doppler probe if pulses are not palpable.

Assess for the 6 Ps of acute limb ischemia (compartment syndrome/limb ischemia watch):

1. Pain — severe, disproportionate to the procedure
2. Pallor — pale or mottled skin on the affected extremity
3. Pulselessness — absent or diminished distal pulses
4. Paresthesia — tingling or numbness in the foot/toes
5. Paralysis — inability to move toes or foot
6. Poikilothermia (Polar) — the limb feels cold compared to the contralateral side

Any combination of these findings — particularly the first four — is a vascular emergency. Notify the cardiologist and anticipate emergent vascular surgery consultation. For a detailed compartment syndrome nursing reference, see compartment syndrome nursing.

Ambulation criteria after femoral access

Before allowing the patient to ambulate:

• Sheath has been removed (or closure device placed).
• Hemostasis is confirmed — no active bleeding or expanding hematoma.
• Bed rest period has elapsed per cardiologist order.
• Vital signs are stable.
• Pedal pulses are intact.

When first ambulating: assist the patient to a sitting position slowly (orthostatic hypotension is common post-sedation and after prolonged supine positioning), dangle legs at bedside for 1–2 minutes, then ambulate with assistance. Inspect the groin immediately after the patient stands — increased abdominal and femoral pressure with standing can re-open the site.

Post-procedure nursing care — radial access

Radial access has significant advantages: lower major bleeding rates, no bed rest requirement, and earlier patient comfort. The nursing assessment focus shifts from groin to wrist and hand.

TR Band protocol

The TR (transradial) Band is an inflatable compression band applied over the radial access site immediately after the cardiologist removes the sheath. The band uses air pressure to maintain hemostasis while preserving enough residual flow to prevent radial artery occlusion.

Gradual deflation method (patent hemostasis protocol): The goal is to reduce compression incrementally while maintaining hemostasis — this preserves radial artery patency. Typical facility protocol:

1. Band applied in cath lab; air volume documented (commonly 12–18 mL air).
2. At 1 hour: remove 2–3 mL air. Observe site for 5 minutes.
3. Every 30–60 minutes thereafter: remove 2–3 mL more. Observe after each reduction.
4. At each deflation step: inspect for bleeding or ooze. If bleeding occurs, re-inflate 2 mL and wait another 30 minutes before attempting deflation again.
5. Band typically fully removed at 2–4 hours post-procedure.
6. After band removal: cover with a small gauze dressing for 1–2 hours.

Never deflate the TR Band rapidly — abrupt decompression risks hematoma formation and radial artery occlusion.

Radial access assessment

After each deflation step and with every vital sign check, assess:

• Radial pulse — should be palpable distal to the band. Absence of radial pulse suggests occlusion or excessive compression.
• Capillary refill — should be <3 seconds in all fingers of the access hand.
• Hand color and warmth — should match the contralateral hand. Pallor, cyanosis, or cold hand requires immediate reassessment.
• Sensation — patient should report normal sensation in all fingers. Numbness or tingling may indicate nerve compression from the band or hematoma.
• Wrist/forearm hematoma — inspect and palpate for swelling extending proximal to the band. Mark the borders of any hematoma and document time.

Radial artery occlusion

Radial artery occlusion (RAO) is the most common complication of transradial access, occurring in approximately 1–5% of cases. Most are asymptomatic because ulnar collateral flow (confirmed by Allen test pre-procedure) maintains hand perfusion. However, RAO eliminates future radial access on that side and is associated with rare cases of hand ischemia.

Risk factors for RAO include:

• Small radial artery diameter relative to sheath size
• Tight compression (non-patent hemostasis technique)
• Prolonged compression time
• Diabetes
• Female sex

Patent hemostasis — the gradual deflation protocol described above — is the primary nursing intervention to prevent RAO.

Vital sign monitoring

Monitor and document vital signs per facility protocol. A common post-cardiac catheterization monitoring schedule is:

• Every 15 minutes × 4 (first hour)
• Every 30 minutes × 2 (next hour)
• Every 1 hour until stable discharge criteria met (or per cardiologist order)

With each vital sign check, assess: access site (bleeding, hematoma), distal pulse (femoral: pedal pulses; radial: radial/hand), urine output, level of consciousness (sedation recovery), and ECG rhythm.

When to notify the cardiologist immediately:

• Systolic BP <90 mmHg or >180 mmHg, or significant change from baseline
• Heart rate <50 or >120 bpm
• New ST-segment changes on monitoring (stent thrombosis consideration)
• Chest pain after the procedure (must distinguish post-procedural discomfort from ischemia)
• Active bleeding or expanding hematoma at the access site
• Absent pedal pulses or signs of limb ischemia
• Symptoms of contrast reaction (urticaria, bronchospasm, hypotension)
• Urine output <0.5 mL/kg/h (oliguria suggesting CIN)

For management of cardiac arrhythmias post-procedure, have ACLS protocols and emergency equipment ready.

Contrast dye: nephropathy prevention and reaction management

Contrast-induced nephropathy (CIN)

Iodine-based contrast agents are directly nephrotoxic — they cause renal tubular injury through ischemic and oxidative mechanisms. CIN is defined as a rise in serum creatinine of ≥0.5 mg/dL (or ≥25% increase from baseline) within 48–72 hours of contrast exposure, in the absence of another cause.

Nursing actions to prevent CIN:

• Obtain a baseline creatinine and eGFR before the procedure. Document clearly.
• Ensure pre- and post-hydration is ordered and administered — IV normal saline (0.9% NaCl) is the most evidence-supported agent. Sodium bicarbonate infusions are used at some centers.
• Post-procedure: maintain IV fluids as ordered to ensure brisk diuresis and dilute contrast load.
• Monitor urine output hourly (or with each vital sign check). Oliguria (<0.5 mL/kg/h) should be reported promptly.
• Check a repeat BMP at 24–48 hours post-procedure if the patient is at risk (pre-existing CKD, diabetes, heart failure, large contrast volume, multiple contrast exposures). See AKI nursing and CKD/ESRD nursing for broader renal management context.
• Hold metformin 48 hours post-contrast. Contrast reduces GFR transiently, slowing metformin clearance and raising the risk of biguanide-induced lactic acidosis. Restart metformin only after repeat creatinine confirms stable renal function.
• Educate the patient on fluid intake after discharge — encourage oral hydration for 24 hours.

High-risk patients for CIN:

• eGFR <60 mL/min/1.73 m² (risk increases significantly below eGFR 30)
• Diabetes mellitus
• Dehydration or volume depletion
• Heart failure with reduced ejection fraction
• Large contrast volume (>100 mL)
• Prior CIN

Contrast reaction recognition and management

Contrast reactions range from mild to life-threatening. Know the timing:

Immediate reactions (within minutes of injection):

Delayed reactions (1 hour to 1 week post-exposure): skin rashes, flu-like symptoms, and pruritis can occur. These are typically managed with antihistamines and steroids and are rarely life-threatening. Patients should be counseled to contact their provider if they develop new symptoms after discharge.

For patients with a documented prior contrast reaction, the pre-medication protocol (corticosteroids + diphenhydramine) must be confirmed before the procedure — see the pre-procedure section above. See anaphylaxis nursing for full epinephrine and anaphylaxis management protocols.

Anticoagulation reversal

During femoral PCI, heparin is administered to prevent catheter-related thrombus formation (activated clotting time [ACT] target 250–300 seconds for PCI). If the ACT is not adequate before sheath removal, protamine sulfate may be used to reverse heparin (1 mg protamine per 100 units of unfractionated heparin administered in the prior 2–4 hours). Protamine has its own risks — anaphylaxis, hypotension, and bradycardia — so it is administered slowly (over 10 minutes) with resuscitation equipment available.

For patients on direct thrombin inhibitors (bivalirudin is commonly used in PCI), there is no reversal agent — the anticoagulant effect wanes with the drug’s half-life.

See anticoagulation nursing for comprehensive anticoagulation monitoring and reversal guidance.

Resuming medications post-procedure

Discharge teaching

Discharge education after cardiac catheterization must be specific, actionable, and written. Patients are discharged within hours of the procedure (same-day in uncomplicated diagnostic cases) or the following morning after PCI. Cognitive effects of sedation can impair retention — provide written instructions and confirm the patient has a responsible adult with them.

Activity restrictions

Femoral access:

• Avoid lifting objects heavier than 10 pounds for 5 days.
• No strenuous activity or exercise for 5 days.
• No soaking the groin site (no baths, hot tubs, or swimming) until healed — showers are permitted.
• May resume light walking immediately; avoid hills and stairs on day 1.

Radial access:

• Avoid heavy wrist use (lifting, gripping) for 24–48 hours while the puncture site heals.
• No soaking the wrist site for 24 hours.
• Driving restriction: no driving for 24 hours post-moderate sedation — regardless of access site.

Site care

• Keep the dressing clean and dry for 24 hours.
• After 24 hours, remove the dressing and wash gently with soap and water.
• A small bruise at the access site is normal and will resolve over 1–2 weeks.
• Some firmness under the skin is normal in the first week.

Warning signs: when to call the cardiologist

Instruct the patient to call the cardiologist’s office (non-emergency) if they notice:

• A small amount of bright red bleeding that stops with 10–15 minutes of direct pressure
• Slowly expanding mild bruising at the access site
• Low-grade fever (<101°F) in the first 24 hours
• Mild swelling at the site

Warning signs: when to call 911

Instruct the patient to call 911 immediately for:

• Active bleeding that does not stop with 10–15 minutes of firm pressure
• Sudden large hematoma (rapid swelling at groin or arm)
• Chest pain, shortness of breath, or palpitations (stent thrombosis or ischemia)
• Leg or arm that becomes cold, pale, numb, or painful (limb ischemia)
• Signs of stroke (sudden facial droop, arm weakness, speech difficulty)
• High fever (>101.5°F) or signs of infection at the site (warmth, pus, spreading redness)
• Any difficulty breathing, throat tightening, or new rash (delayed contrast reaction)

Medication reminders

• Remind the patient explicitly: metformin is held 48 hours after the procedure.
• Emphasize dual antiplatelet therapy compliance if a stent was placed — stopping aspirin or the P2Y12 inhibitor early dramatically increases the risk of in-stent thrombosis.
• Confirm the patient has all prescriptions filled before discharge.
• Provide written follow-up appointment date.

20 NCLEX high-yield tips

1. First action post-femoral cath — assess the access site (groin) and check bilateral pedal pulses. Pulse assessment always precedes other interventions.

2. Retroperitoneal hematoma is a silent killer — look for hypotension, tachycardia, and flank/back pain with no visible groin hematoma. It is not obviously visible. Treat as a hemorrhagic emergency.

3. Allen test before radial access — confirms ulnar collateral flow. A failed Allen test is a contraindication to radial access on that side.

4. TR Band deflation is gradual — never remove all air at once. The patent hemostasis technique preserves radial artery patency.

5. Metformin hold is 48 hours post-contrast — not just day-of. Restart only after stable creatinine is confirmed. The risk is lactic acidosis.

6. 6 Ps of limb ischemia — Pain, Pallor, Pulselessness, Paresthesia, Paralysis, Poikilothermia. Any combination = vascular emergency; call cardiologist now.

7. Pseudoaneurysm = pulsatile mass at groin — do not apply unguided compression. Notify cardiologist; ultrasound and thrombin injection are the interventions.

8. AV fistula = bruit at access site — auscultate the groin post-procedure. A new bruit suggests an arteriovenous communication.

9. Vital sign monitoring frequency — Q15min × 4, Q30min × 2, Q1h until stable. Know this schedule for the NCLEX.

10. HOB restriction (femoral) — keep ≤30° and leg straight until bed rest is complete. Hip flexion causes the femoral artery to kink and can re-open the site.

11. Contrast nephropathy prevention — hydration is the primary preventive intervention. IV normal saline pre- and post-procedure. Hold metformin.

12. Priority after PCI for STEMI — door-to-balloon time target is ≤90 minutes. This is a time-critical performance metric.

13. Antiplatelet therapy after stent — dual antiplatelet therapy (aspirin + P2Y12 inhibitor) is non-negotiable after stent placement. Stopping early causes stent thrombosis.

14. Radial artery occlusion is usually asymptomatic — because ulnar collateral flow (verified by Allen test) maintains hand perfusion. But it eliminates future radial access on that side.

15. Protamine reverses heparin — 1 mg per 100 units unfractionated heparin. Administer slowly (over 10 minutes); anaphylaxis and hypotension are risks.

16. Pre-procedure contrast allergy protocol — prednisone (or methylprednisolone) + diphenhydramine. Must be given before procedure — not just available.

17. Urine output monitoring post-contrast — goal ≥0.5 mL/kg/h. Oliguria post-procedure signals possible CIN — notify cardiologist.

18. Drug-eluting stent vs bare metal stent — drug-eluting stents require longer dual antiplatelet duration (12+ months typical) vs bare metal stents (typically 1 month minimum for elective cases).

19. Driving restriction = 24 hours post-moderate sedation — applies regardless of access site (femoral or radial). This is a sedation effect, not a vascular restriction.

20. Creatinine check at 48 hours post-contrast — critical for at-risk patients (CKD, diabetes, heart failure). CIN typically peaks at 48–72 hours post-exposure.

20 NCLEX-style scenario questions

Clinical sources

This article draws on the following authoritative sources:

• American Heart Association / American College of Cardiology PCI guidelines (2021 update)
• Society for Cardiovascular Angiography and Interventions (SCAI) consensus documents on transradial access and hemostasis
• Kern M, Sorajja P, Lim MJ. The Cardiac Catheterization Handbook, 6th ed. Elsevier, 2015
• ACR Manual on Contrast Media (American College of Radiology, current edition)
• Brunner & Suddarth’s Textbook of Medical-Surgical Nursing, 15th ed. (Hinkle & Cheever)
• UpToDate: “Contrast-induced nephropathy”; “Vascular complications of femoral artery catheterization”; “Transradial approach to cardiac catheterization”
• Lippincott Nursing Center clinical practice resources on post-catheterization care
• ACC/AHA Guideline on the Management of Patients with Non-ST-Elevation Acute Coronary Syndromes