In the perioperative environment, diastolic dysfunction (DD) can be categorized as either severe, encompassing grades III and IV, or non-severe, including grades I and II.
Grade I patients require a focus on preserving normal sinus rhythm to support ventricular filling during diastole, given their reliance on atrial contraction due to delayed relaxation and an E/A ratio below 1. Aggressive hydration is essential to counteract the left ventricle's impaired relaxation.
Grade II DD, characterized by a pseudonormal pattern, demands careful fluid management due to their sensitivity to fluid changes, with the risk of mimicking grade I dysfunction under hypovolemia or advancing to grade III characteristics if overloaded.
Patients with grades III and IV DD are considered to have severe disease and pose a high perioperative risk due to consistently high left atrial pressures, which can lead to complications such as pulmonary edema, post-capillary pulmonary hypertension, and right ventricular systolic dysfunction. During surgeries with significant fluid shifts, vigilant monitoring through invasive methods or echocardiography is critical. For hypotension, the primary approach should involve vasopressor or inotropic therapy rather than fluid administration, given the potential for both systolic and diastolic dysfunction. Some inotropes may also improve ventricular relaxation and lower left atrial pressures. Strategies such as vasoconstriction can help manage blood volume by reducing vascular capacitance without additional fluids, potentially benefiting from diuretic therapy to normalize the pressure-volume relationship. Additionally, preload reduction techniques, like the valsalva maneuver, reverse trendelenburg positioning, or nitroglycerin use, may decrease left atrial pressures and adjust echocardiographic indicators back to a pseudonormal pattern.
In general, maintaining a normal to slightly slower heart rate is beneficial. This heart rate allows for extended diastolic filling time, crucial for a heart that fills poorly due to increased stiffness. The use of inotropes is usually not recommended and can potentially lead to further hemodynamic instability. Given that cardiac output (CO) is influenced significantly by both preload and heart rate (HR), marked decreases in blood volume or filling pressures, along with extremes in heart rate like bradycardia or tachycardia, and atrial arrhythmias, including atrial fibrillation or flutter, are often poorly tolerated.
For grades I and II and in cases of relatively short, minimally or moderately invasive surgeries where early postoperative walking is anticipated, administering a smaller fluid volume (e.g., less than 1 liter) is usually suitable for patients with heart failure, as opposed to the 1 to 2 liters commonly given to patients without heart failure during similar procedures. For more extensive invasive surgeries, a restrictive, zero-balance strategy that limits fluid intake is typically adopted, or a goal-directed method is used, where fluid is administered often alongside vasopressor or inotropic support to meet a specific hemodynamic target.
The effectiveness of avoiding general anesthesia in favor of neuraxial or regional techniques for patients with DD remains unclear due to a lack of supporting literature. However, informed assumptions suggest that patients, especially those with severe DD and compromised functional capacity, might benefit from alternative anesthetic methods. These techniques can potentially mitigate risks associated with general anesthesia, such as the effects of induction, positive pressure ventilation, the myocardial depressant properties of maintenance anesthetics, and the arrhythmogenic potential of neuromuscular blockade reversal agents.
Furthermore, it's crucial for clinicians to carefully consider the perioperative management of comorbid conditions common in DD patients, like coronary artery disease or atrial fibrillation, which may necessitate systemic anticoagulation. A thorough review of the patient's medication regimen is essential to determine if adjustments are necessary to align with the perioperative plan, ensuring safety and optimizing outcomes.
| Group | Main vulnerability | Perioperative priorities |
|---|---|---|
| Grade I | Delayed relaxation with reliance on atrial contraction (E/A <1) | Preserve normal sinus rhythm to support diastolic filling; aggressive hydration to counteract impaired LV relaxation |
| Grade II | Pseudonormal pattern with marked sensitivity to fluid changes | Careful fluid management: hypovolemia mimics grade I, overload advances toward grade III characteristics |
| Grades III–IV | Persistently high left atrial pressure → pulmonary edema, post-capillary pulmonary hypertension, right ventricular systolic dysfunction | Invasive or echocardiographic monitoring during large fluid shifts; treat hypotension with vasopressor (or, selectively, inotropic) therapy rather than fluid administration — some inotropes may improve ventricular relaxation and lower left atrial pressure, but routine inotrope use is usually not recommended and can worsen hemodynamic instability; consider preload reduction (valsalva, reverse Trendelenburg, nitroglycerin) |
| All grades — rate and rhythm | Cardiac output depends heavily on preload and heart rate | Aim for a normal to slightly slower rate to extend diastolic filling time; bradycardia, tachycardia, and atrial fibrillation or flutter are poorly tolerated |
| Fluid volume | Volume overload precipitates pulmonary congestion | Grades I–II, short minimally or moderately invasive cases with early postoperative walking expected: less than 1 liter, versus the 1–2 liters commonly given to patients without heart failure for similar procedures; more extensive surgery: restrictive zero-balance or goal-directed therapy with vasopressor or inotropic support |
