Common Readmission Causes and Targeted Discharge Documentation
- The Society of Thoracic Surgeons (STS) tracks 30-day readmission as a quality metric in its cardiac surgery database, with CABG and valve surgery programs reporting readmission rates to STS as part of participation requirements. Per STS published data, the most frequently cited primary diagnoses at readmission after CABG include atrial fibrillation or flutter, pleural effusion requiring drainage, wound complications including deep sternal wound infection, and congestive heart failure. Each of these readmission categories has associated discharge documentation elements that can reduce the risk of readmission by improving patient recognition of early warning signs.
- Atrial fibrillation (AF) is the most common complication of cardiac surgery, occurring in 25 to 40 percent of patients after CABG and 40 to 60 percent of patients after valve surgery, per the American Association for Thoracic Surgery (AATS) guidelines on post-operative atrial fibrillation. Many patients develop AF after hospital discharge. Discharge instructions must address: the symptoms of AF the patient may notice (palpitations, irregular heartbeat, lightheadedness, shortness of breath, near-syncope), whether anti-arrhythmic medication was prescribed and the dosing and duration, whether anticoagulation was initiated and the specific drug and monitoring requirements, and under what circumstances the patient should call 911 versus contact the practice for suspected AF recurrence.
- Pleural effusion after cardiac surgery develops from pleural disruption during pericardiotomy and from the inflammatory response to cardiopulmonary bypass. Discharge instructions must specify the symptoms that may indicate a significant pleural effusion: progressive dyspnea on exertion that worsens over days, inability to lie flat, dry cough that does not resolve, and decreased exercise tolerance not explained by deconditioning. Instructions should distinguish these symptoms from the expected gradual improvement in respiratory function that characterizes normal cardiac surgery recovery. Patients warned about pleural effusion symptoms with a specific contact threshold detect effusions earlier and avoid progression to a size requiring thoracentesis under urgent conditions.
- Pericardial effusion and post-pericardiotomy syndrome (Dressler syndrome) are immune-mediated complications that typically present 1 to 6 weeks after cardiac surgery. Symptoms include pleuritic chest pain that improves with sitting forward, fever, malaise, and friction rub on auscultation. Discharge instructions should describe these symptoms and specify that they require prompt evaluation, both because post-pericardiotomy syndrome requires treatment and because pericardial effusion can progress to tamponade. Chest pain after cardiac surgery that differs from expected sternal incision discomfort, particularly pleuritic or positional chest pain, requires same-day evaluation rather than expectant waiting for a scheduled appointment.
Sternal Precautions and Wound Care Documentation
- Median sternotomy is used for the majority of cardiac surgical procedures and requires a healing period of 6 to 8 weeks before the sternum achieves structural stability sufficient for unrestricted upper extremity use. Sternal precautions are activity restrictions designed to prevent sternal wound dehiscence and deep sternal wound infection (DSWI) during this healing period. Discharge instructions must document the specific sternal precautions prescribed by the surgical team: the weight-bearing limit for each arm (typically no lifting more than 5 to 10 pounds), the prohibition on using the arms to push out of or lower into a chair, and the prohibition on driving during the precaution period. Generic instructions to avoid strenuous activity do not constitute adequate sternal precaution documentation.
- Deep sternal wound infection (DSWI) after median sternotomy is a serious complication with high morbidity, and early recognition depends on the patient knowing the specific signs to report. Discharge instructions must specify the wound monitoring requirements: inspect the sternal incision daily, report any redness extending beyond the incision margins, any separation of wound edges (dehiscence), any drainage from the incision, any clicking or instability of the sternum with movement, and any fever above 101 degrees Fahrenheit. Patients should be instructed to contact the surgical practice the same day they notice any of these signs. The Society of Thoracic Surgeons (STS) and the American Association for Thoracic Surgery (AATS) include wound surveillance in their post-operative care quality metrics.
- Leg wound care is relevant for patients who underwent saphenous vein harvest for bypass grafting. The saphenous vein harvest incision may extend from the ankle to the thigh depending on the number of grafts required. Discharge instructions must address: wound care for the harvest site including dressing change frequency, signs of harvest site infection, compression stocking use and duration (typically until edema resolves), leg elevation recommendations for the first 2 to 4 weeks to reduce edema, and activity restrictions for the leg. Harvest site wound complications, including cellulitis and lymphatic injury, are among the more common reasons for post-cardiac surgery outpatient visits and antibiotic prescriptions, and timely wound care instructions reduce their frequency.
- Endoscopic vein harvest (EVH) has largely replaced open vein harvest for saphenous vein graft collection and produces smaller portal site wounds at the knee and a single extraction incision. Discharge instructions for patients with EVH should address: care of the portal sites (typically covered with adhesive strips for 7 to 10 days), care of the extraction incision, signs of hematoma at the harvest site (sudden swelling and firmness at the harvest site in the first 48 hours), and the same compression and elevation guidance applicable to open harvest. Instructions that do not distinguish between open and endoscopic harvest create confusion about the number and location of wounds the patient should monitor.
Medication Reconciliation and Anticoagulation Documentation
- Cardiac surgery patients are typically discharged with a complex medication regimen that includes newly prescribed drugs for rhythm management, anticoagulation, antiplatelet therapy, heart failure management, and pain control. Medication reconciliation at discharge, comparing the patient's pre-operative medications to the discharge medication list and documenting all changes, is a Joint Commission National Patient Safety Goal (NPSG 03.06.01) and is required for accredited hospitals. The discharge medication list must document every drug by name, dose, frequency, and duration, and must explicitly note which pre-operative medications were stopped and why.
- Anticoagulation documentation is a high-stakes element of cardiac surgery discharge records. Patients who received valve replacement with a mechanical prosthesis require lifelong anticoagulation with warfarin. Discharge instructions must specify the target international normalized ratio (INR) range for the prosthesis implanted, the initial warfarin dose prescribed, the date of the first INR check after discharge, the monitoring frequency until therapeutic levels are achieved, dietary guidance on consistent vitamin K intake, and the contact pathway for an INR result outside the target range. Patients who do not receive specific INR monitoring instructions frequently present to emergency departments with supratherapeutic INR or thromboembolic events in the first 30 days after mechanical valve surgery.
- Direct oral anticoagulants (DOACs) are prescribed after cardiac surgery for some indications, including post-operative atrial fibrillation and pulmonary embolism. Discharge instructions must document: the specific DOAC prescribed (apixaban, rivaroxaban, or dabigatran), the dose and frequency, the planned duration of anticoagulation, and any dose adjustment requirements based on renal function. Patients must be instructed not to stop the medication without consulting the prescribing provider, because abrupt discontinuation in patients with a high embolic risk profile can result in stroke or thromboembolism.
- Beta-blocker therapy initiated after cardiac surgery requires specific instructions because abrupt discontinuation can precipitate rebound tachycardia and ischemia. Discharge instructions must document the beta-blocker prescribed, its dose, frequency, and duration, and must explicitly state not to stop the medication without physician guidance. Patients who cannot tolerate the prescribed dose should be instructed to contact the practice for a dose adjustment rather than stopping the medication entirely. The American College of Cardiology (ACC) and the American Heart Association (AHA) joint guidelines on perioperative beta-blocker therapy in cardiac surgery patients support continuation through the post-operative period, and document that abrupt discontinuation is associated with adverse cardiac events.
Post-Discharge Follow-Up and Cardiac Rehabilitation Documentation
- The timing and content of post-discharge follow-up visits are among the most consistently cited factors in cardiac surgery readmission prevention. STS quality improvement data support scheduling the first post-discharge follow-up visit within 7 to 10 days of hospital discharge for cardiac surgery patients. Discharge instructions must document the date, time, and location of the first follow-up appointment and must provide the contact information for the cardiac surgery office. Patients who do not have a scheduled follow-up appointment before leaving the hospital are substantially more likely to present to emergency departments with post-discharge symptoms than patients who have a scheduled appointment and a provider contact they can call.
- Cardiac rehabilitation is a class I indication (strongest recommendation level) in American College of Cardiology and American Heart Association (ACC/AHA) guidelines for patients after CABG and valve surgery. Cardiac rehabilitation reduces cardiovascular mortality, improves functional capacity, and reduces readmission rates per data reviewed in the ACC/AHA guidelines. Discharge instructions should document: whether a cardiac rehabilitation referral was made, the name and contact information of the cardiac rehabilitation program, and when the patient is expected to start (typically 4 to 6 weeks after surgery when the sternum has sufficient stability for supervised exercise), as well as what the patient can do in the interim to stay active within current functional limits.
- Activity restrictions after cardiac surgery must be communicated in specific, patient-understandable terms. Discharge instructions should specify: walking is encouraged beginning with short walks (5 to 10 minutes) on flat ground, increasing duration by 5 minutes daily as tolerated; climbing one flight of stairs is permitted; sexual activity may resume when walking two flights of stairs without symptoms is possible (a threshold specified in many ACC/AHA patient education materials); driving is prohibited while sternal precautions are in effect and while taking prescription opioid analgesics; and return to work is job-specific and requires clearance at a follow-up appointment. Instructions that say only to avoid strenuous activity leave patients unable to determine whether any specific activity falls within their restrictions.
- Weight and fluid monitoring after cardiac surgery requires specific patient education because daily weight gain is an early indicator of fluid retention that can precede symptomatic heart failure exacerbation by 2 to 3 days, allowing for earlier pharmacologic intervention. Discharge instructions should specify: weigh daily at the same time each morning before eating, using the same scale; contact the practice if weight increases by more than 2 pounds in one day or 5 pounds in one week (thresholds used in ACC/AHA heart failure management guidelines); and other symptoms requiring prompt contact include increasing shortness of breath, ankle swelling that is new or worsening, and orthopnea. Patients who do not receive weight monitoring instructions are more likely to present with decompensated heart failure requiring hospitalization rather than decompensation manageable with outpatient diuretic adjustment.