Comparison between the traditional anticoagulant warfarin and novel oral anticoagulants reveals the predictable pharmacokinetic and pharmacodynamic characteristics of the latter, with minimal influence from food and other medications, often eliminating the need for routine coagulation monitoring. As a representative of these novel oral anticoagulants, the Xa factor inhibitor rivaroxaban is widely used in the anticoagulant therapy of pulmonary embolism patients. Common adverse events associated with rivaroxaban include severe blood clots (such as pulmonary embolism) and bleeding events. This medication undergoes hepatic and renal dual-mode metabolism, with drug concentrations being influenced by both liver and kidney function. Studies indicate that in patients with impaired kidney function, using the recommended dose can lead to overdosing and increased risk of bleeding. Guidelines suggest that patients with mild renal impairment (creatinine clearance 50-80 mL/min) or moderate renal impairment (creatinine clearance 30-49 mL/min) do not require adjustment of rivaroxaban doses. For patients with severe renal impairment (creatinine clearance 15-29 mL/min), limited clinical data suggests significantly elevated blood drug concentrations with rivaroxaban, indicating its avoidance. For patients with impaired liver function: rivaroxaban is contraindicated in patients with coagulation abnormalities and clinically relevant bleeding risks, including those with Child-Pugh B and C stage cirrhosis. CYP3A4 and P-gp inhibitors elevate rivaroxaban blood concentrations, particularly evident in cases of renal impairment.

Elderly patients, characterized by declining renal function with age, multiple comorbidities, and polypharmacy, exhibit numerous uncertainties, often experiencing either over-anticoagulation or inadequate anticoagulation. Phase I clinical studies of rivaroxaban in healthy elderly individuals confirmed significant increases in pharmacodynamic parameters (Xa factor inhibition rate, PT) compared to younger individuals. The AUC (area under the curve) of Xa factor inhibition rate in the elderly was 41% higher than in younger individuals. This study attributed the results to declining renal function in the elderly. Population pharmacokinetic studies also confirm that after the age of 65, the complete clearance rate of rivaroxaban decreases annually by 1.05-1.5%.

Therefore, there's no unified recommendation in clinical practice regarding the necessity of adjusting corresponding dosing regimens in different patient types, especially when adverse events occur. While rivaroxaban typically does not require coagulation monitoring in most cases, in elderly patients, particularly those on multiple medications, there is a clinical need to identify suitable laboratory monitoring indicators to measure its anticoagulant efficacy, further assessing the optimal dosage for the elderly population to balance bleeding and recurrence risks. Clinical pharmacological studies indicate that the pharmacokinetic and pharmacodynamic characteristics of drugs in different populations can provide a basis for optimizing dosing regimens. Thus, this study aims to provide a basis for optimizing dosing regimens in the clinical practice of elderly high-risk patients in China through an exploration of the pharmacokinetic and pharmacodynamic indicators.