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心脏导管插入术 I：术前概述
心脏导管插入术是一种侵入性诊断技术，用于识别和评估心脏及主要血管的结构性和功能性疾病。该技术可用于诊断先天性心脏病、冠状动脉疾病、瓣膜性心脏病、冠状动脉痉挛，并评估心室功能。它有助于指导治疗决策，包括是否需要进行血运重建手术，如经皮冠状动脉介入（PCI）或冠状动脉旁路移植（CABG），以及其他干预措…
心脏导管插入术是一种用于识别和评估心脏及主要血管结构和功能疾病的侵入性诊断技术。
它有助于指导治疗决策，例如判断是否需要进行血运重建手术，如冠状动脉旁路移植术。
该操作包括通过大静脉（如股静脉）和大动脉（如桡动脉）插入导管，通常使用放射显影对比剂。
通过透视引导将这些导管插入右心和左心腔，该过程称为右心和左心导管插入术。
两者通常同时进行，但对于心肌活检等操作，单独进行右心导管术可能已足够。
在进行操作前，需检查患者既往是否对对比剂有不良反应。
患者需接受多种血液检测，以评估代谢和肾功能，包括血清电解质和肌酐水平。
进行基线凝血功能检查，例如凝血酶原时间和国际标准化比值，以指导手术过程中的抗凝剂量。
还需要进行全血细胞计数，包括血细胞比容水平，以监测术后失血情况。
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Q1: What is cardiac catheterization used to diagnose?
Cardiac catheterization is an invasive diagnostic technique that identifies and evaluates structural and functional diseases of the heart and major blood vessels. It diagnoses conditions such as congenital heart disease, coronary artery disease, valvular heart disease, and coronary spasms. The procedure also assesses ventricular function and measures intracardiac pressures and oxygen levels directly, helping guide treatment decisions including revascularization procedures.
Q2: How are catheters guided during cardiac catheterization?
Fluoroscopy guides catheters through major blood vessels into the heart's right and left chambers. Radiopaque catheters are inserted through a major vein, such as the femoral vein, and a major artery, such as the radial artery. Using contrast media and fluoroscopy enables visualization of the coronary arteries, delineation of heart chambers, and assessment of wall motion throughout the procedure.
Q3: What blood tests are required before cardiac catheterization?
Patients undergo blood tests to assess metabolic and renal function, including serum electrolytes and creatinine levels. Baseline coagulation studies such as prothrombin time and international normalized ratio guide anticoagulation dosage during the procedure. A complete blood count including hematocrit levels is also necessary to establish baseline values and monitor for blood loss post-procedure.
Q4: Why is contrast agent history important before the procedure?
Before cardiac catheterization, healthcare providers check for previous reactions to contrast agents to prevent allergic complications. Patients at risk for contrast-induced nephropathy, a typically reversible acute kidney injury, include those with chronic kidney disease, nephrotoxic medication use, dehydration, heart failure, and hypotension. Identifying these risk factors allows for appropriate preventive measures and patient monitoring.
Q5: What is the difference between right and left heart catheterization?
Right heart catheterization typically precedes left heart catheterization during the procedure. Right heart catheterization alone may suffice for specific procedures like myocardial biopsies or pulmonary artery pressure evaluations. Left heart catheterization requires a contrast agent to visualize coronary artery patency and evaluate left ventricular function, making it essential for comprehensive cardiac assessment.
Q6: What monitoring is critical during cardiac catheterization?
Continuous monitoring for dyspnea, chest pain, blood pressure changes, and ECG alterations is critical during the procedure, as these may indicate myocardial ischemia, hemodynamic instability, or arrhythmias. Patients receive one or more IV catheters to administer fluids and medications like sedatives and heparin. Resuscitation equipment must be easily accessible and ready for advanced cardiac life support.
Q7: How long is bed rest required after cardiac catheterization?
Post-procedure, patients require bed rest for 2 to 6 hours before ambulating. The length of bed rest depends on factors including catheter size, insertion site (femoral or radial artery), anticoagulation status, age, and bleeding disorders. Individual patient factors determine the specific duration needed to minimize complications such as hematoma formation or bleeding at the puncture site.