PCCN Cardiovascular Review (20%): QTc Monitoring, Care After PCI and Heart Failure Exacerbations

Cardiovascular questions are the single biggest block on the PCCN, and its testable nursing actions read like a telemetry shift: watch the monitor, recover patients from the cath lab, and manage heart failure that won't stay compensated. This review covers those three areas in depth. It teaches from current references, which may be newer than some titles on AACN's exam bibliography, and it is not a substitute for your unit's protocols or a prescriber's orders. No doses are given.

What the PCCN cardiovascular category lists

The test plan in the PCCN Exam Handbook (Direct Care, July 2026) names 15 cardiovascular problems. Grouped by Passy for study:

The testable nursing actions for this category are: identify, interpret and monitor dysrhythmias, QTc intervals and ST segments; manage arterial lines, CVP and noninvasive hemodynamic monitoring; manage patients requiring ablation, arterial closure devices, arterial or venous sheaths, cardiac catheterization, cardioversion, defibrillation, pacemakers (single-chamber, dual-chamber, biventricular), a pericardial drain, PCI, TEE or ventricular assist devices; monitor hemodynamic status; and select leads for cardiac monitoring for the indicated disease process.

At 20%, the category is about 25 scored questions (Passy's arithmetic). Full prep at launch includes 168 planned Cardiovascular questions with an explanation for every option.

QTc monitoring on a progressive care unit

QTc monitoring is a telemetry skill the test plan names directly, and the American Heart Association's 2010 scientific statement on preventing torsade de pointes in hospital settings, written with the American College of Cardiology Foundation and endorsed by AACN, is a detailed bedside reference. Its key points:

• The formula. The Bazett correction divides the measured QT by the square root of the R-R interval in seconds, and when a QTc isn't otherwise labeled, it usually means Bazett. The statement warns that Bazett tends to produce overlong values at faster heart rates, particularly above 85 beats per minute, and that alternatives such as the Fridericia formula (dividing by the cube root) correct better at fast rates.
• The lead. Measure in a lead with a T wave of at least 2 mm and a clearly defined end, and use the same lead in the same patient over time, documenting which one.
• The method. Before and after a drug is started, keep everything consistent: the same recording device, lead, measurement tool and correction formula.
• The timing. A reasonable strategy, the statement says, is to document the QTc before and at least every 8 to 12 hours after a QT-prolonging drug is started, its dose is increased, or an overdose occurs, and more often if the QTc lengthens.
• The thresholds. Upper limits of normal (99th percentile) are about 470 ms for men and 480 ms for women, and a QTc above 500 ms is considered highly abnormal. After an at-risk drug, a QTc above 500 ms or a rise of at least 60 ms from the pre-drug baseline means prompt action is indicated.

A worked example (fictional). A patient's baseline QTc, by Bazett, is 450 ms. After a QT-prolonging drug is started, the QT measures 400 ms at a heart rate of 100/min, so the R-R interval is 0.60 seconds.

• Bazett: 400 ÷ √0.60 = 400 ÷ 0.775 ≈ 516 ms. That is above 500 ms and 66 ms above baseline.
• Fridericia, for comparison: 400 ÷ ∛0.60 = 400 ÷ 0.843 ≈ 474 ms.

The two numbers differ because the heart rate is fast, which is exactly where the statement says Bazett runs long. The lesson is not to pick the friendlier formula. The statement asks hospitals to set one method in protocol, and switching formulas partway through a trend breaks the consistency it calls for. By the Bazett trend this patient has crossed both thresholds, which is the point to report and act. Practicing that arithmetic until it is automatic pays off, and worked QTc calculations appear in planned PCCN telemetry scenarios.

What prompt action means. The AHA statement lists alternative drug therapy, a check for interacting drugs, bradycardia and electrolyte problems, and an external defibrillator ready at hand. Its summary of actions when signs of impending torsade appear is to stop the offending drug, replace potassium, give magnesium, consider temporary pacing to prevent bradycardia and long pauses, and move the patient to the highest level of ECG surveillance with immediate defibrillation available.

Who is at risk. The statement's risk factors in hospitalized patients include a QTc above 500 ms, more than one QT-prolonging drug, rapid IV infusion of such a drug, heart failure or myocardial infarction, older age, female sex, hypokalemia, hypomagnesemia, hypocalcemia, diuretic treatment, impaired liver metabolism of the drug, and bradycardia or pauses. Risk is greatest when several cluster in one patient.

Recognizing torsade de pointes. It is a polymorphic ventricular tachycardia whose QRS complexes twist around the baseline, typically starting after a short-long-short sequence of R-R intervals. The MSD Manual lists warning signs on the monitor: T- and U-wave fusion, repolarization changes after a pause, visible T-wave alternans, frequent polymorphic premature ventricular beats and repeated short runs of polymorphic VT. Runs often stop on their own but can degenerate into ventricular fibrillation, which needs unsynchronized defibrillation; the MSD Manual names IV magnesium, correction of hypokalemia, measures that raise the heart rate, and treating the cause.

ST segments and suspected ACS on a step-down unit

The MSD Manual's overview of acute coronary syndromes (reviewed July 2026) separates the three syndromes by symptoms, ECG and troponin:

Points that matter at the bedside, from the same source: the ECG should be done as soon as possible, within 10 minutes of presentation; a normal ECG taken while the patient is pain-free does not exclude unstable angina; repeat ECGs that show ST-T changes resolving or worsening make ischemia very likely; and some patients, particularly people with diabetes, have silent ischemia. An elevated troponin shows myocardial injury but not its cause.

Lead selection is itself a testable nursing action: "select leads for cardiac monitoring for the indicated disease process." This review doesn't teach it. AACN publishes two related practice alerts, "Accurate Dysrhythmia Monitoring in Adults" (its summary names electrode placement and lead selection) and "Ensuring Accurate ST-Segment Monitoring," on its Practice Alerts page; the full text is free with an AACN.org registration. For the stable-or-unstable decision in a tachycardia or bradycardia under the 2025 AHA guidelines, the published CCRN cardiovascular review has a full table, and the reasoning is the same on a step-down unit.

After cardiac catheterization or PCI

Access route. The MSD Manual's PCI chapter (reviewed July 2026) says the radial approach is preferred because it reduces discomfort, shortens time to ambulation and lowers some complications, such as bleeding and pseudoaneurysm. Femoral access is still used, and the test plan lists arterial and venous sheaths and arterial closure devices among the devices you must manage.

Access-site complications. From the MSD Manual's cardiac catheterization chapter (reviewed May 2026):

• Bleeding from the site usually resolves with compression, and mild bruising and small hematomas are common.
• A large or enlarging lump should be investigated with ultrasound to tell a hematoma from a pseudoaneurysm.
• A bruit at the site, with or without pain, suggests an arteriovenous fistula.
• Limb ischemia is also listed among access-site complications.

Retroperitoneal bleeding. A 2026 review of PCI vascular access complications in npj Cardiovascular Health describes it as an infrequent but serious complication of femoral access (reported in 0.025% to 0.9% of procedures), associated with higher 30-day mortality. Risk rises with female sex, low body weight, chronic kidney disease, COPD, cardiogenic shock, acute MI, large sheaths, a high femoral puncture, glycoprotein IIb/IIIa inhibitors, emergency procedures and periprocedural heparin, and the review notes that bleeding can track into the retroperitoneal space even after a puncture below the inguinal ligament. Management it describes: prompt fluid resuscitation, transfusion, reversal of anticoagulation when indicated, CT angiography if the patient is stable, and an immediate return to the catheterization lab if not. For the nurse, the practical point is to report hemodynamic change after a femoral procedure promptly, because the next step depends on how stable the patient is.

Kidneys. The MSD Manual's PCI chapter calls contrast-induced nephropathy a high risk with PCI relative to many other angiographic procedures. Its cardiac catheterization chapter defines contrast-induced acute kidney injury as a 25% to 50% rise in creatinine from baseline, or an absolute rise of 0.3 to 0.5 mg/dL, within 2 to 7 days of contrast, and lists preventive steps such as the lowest possible contrast dose, stopping nephrotoxic medications and volume expansion before and after contrast. This links to a renal testable action: initiating renal protective measures for nephrotoxic procedures.

Antithrombotic therapy. The PCI chapter notes that stent thrombosis can follow premature discontinuation of dual antiplatelet therapy, for example from nonadherence, which makes medication teaching part of post-PCI care. For PCI in patients with heparin-induced thrombocytopenia, which the test plan lists under Hematology, the chapter says bivalirudin or argatroban should be used in place of unfractionated heparin.

Heart failure exacerbations: the medication cautions

The MSD Manual's acute heart failure chapter (reviewed October 2025) classifies acute heart failure by perfusion ("warm" or "cold") and congestion ("dry" or "wet"). Its treatment goals include relieving symptoms and improving hemodynamics while avoiding hypokalemia, renal dysfunction and symptomatic hypotension, and it names loop diuretics, oral or IV, as the mainstay of decongestive therapy. Physical signs listed in the chronic heart failure chapter include jugular venous distention, an S3, crackles, hypoxemia, cool extremities with delayed capillary refill, a narrow pulse pressure and tachycardia.

The medication cautions worth knowing cold, all from the MSD Manual's heart failure medications chapter (reviewed October 2025):

For discharge teaching, the chronic heart failure chapter says daily morning weights help detect fluid retention early, and that a gain of more than 2 kg over a few days may let patients adjust their diuretic as instructed, but continued gain or symptoms mean seeking care. Numbers like the 36-hour washout are easy to lose, and planned flashcards on thresholds such as the 36-hour ACE inhibitor washout are part of full prep at launch.

TAVI, takotsubo and the other named topics

• TAVI (TAVR). The MSD Manual's aortic stenosis chapter (reviewed June 2025) says that, compared with surgical valve replacement, transfemoral TAVI has lower short-term mortality and less risk of stroke, major bleeding and atrial fibrillation, but more vascular complications, more paravalvular regurgitation and a greater need for permanent pacemaker implantation. Those are the complications to keep in mind when a TAVI patient reaches your unit.
• Takotsubo cardiomyopathy. The MSD Manual's dilated cardiomyopathy chapter describes stress (takotsubo) cardiomyopathy as acute left ventricular systolic dysfunction precipitated by a hyperadrenergic state, typically reversible, and a cause of abrupt presentations.
• Tamponade and hypertensive crisis. Both are on the PCCN list. The published CCRN cardiovascular review works through a tamponade vignette and the first-hour blood pressure arithmetic from the 2025 AHA/ACC guideline.

Your next step for PCCN cardiovascular study

Take the testable nursing actions list above and mark each item routine, occasional or never, as the PCCN study plan guide suggests. Then calculate three QTc values by hand from rhythm strips at work, using your unit's formula, and check them against the monitor. When you are ready to test yourself, the PCCN practice questions guide includes an original QTc item, and the free PCCN practice questions mix cardiovascular items with other test plan categories.