N-of-1 Trials to Promote Deprescribing in Older Adults With Transthyretin Cardiac Amyloidosis
试验速览
- 阶段
- 4 期
- 状态
- 已完成
- 入组人数
- 14
- 试验地点
- 1
- 主要终点
- The change in exercise capacity when on beta-blocker versus when off beta-blocker, as measured by peak oxygen consumption (VO2) during Cardiopulmonary Exercise Test (CPET).
研究概览
简要总结
The study team will generate preliminary data on whether patients with cardiac amyloidosis feel better when their beta-blocker is stopped. To achieve this objective, 20 N-of-1 trials (on vs. off) will be conducted, and the study team will subsequently interview participants to better understand their outcomes. Each subject will participate in 2 periods lasting between up to 6 weeks each based on each patient's health profile. We will also engage stakeholders to understand the acceptability and feasibility of deprescribing N-of-1 trials. The N-of-1 trials will be iteratively refined in real-time based on feedback.
详细描述
The intervention is an unblinded NIH Stage I of Behavioral Intervention Development trial, using a single-arm crossover withdrawal/reversal design (On [A] vs. Off [B]) with 2 periods, each period lasting up to 6 weeks, allowing for down-titration and washout. During the On (A) period, participants will be on their beta-blocker (or the highest dose they can safely tolerate), as previously prescribed to the subjects by their physician. During the Off (B) period, their beta-blockers will be down-titrated and subsequently discontinued (or at the lowest dose they can safely tolerate); we will decrease the dose of beta-blocker by 50% every week regardless of which beta-blocker they are on, similar to an algorithm used in a prior deprescribing trial.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Other
- 盲法
- None
入排标准
- 年龄范围
- 65 Years 至 —（Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Ambulatory adults age ≥65 years with TTR-cardiac amyloidosis (confirmed by PYP scan or biopsy)
- •Taking beta-blocker
排除标准
- •Other compelling indication(s) for beta-blockers:
- •Acute coronary syndrome, myocardial infarction or coronary artery bypass surgery in prior 3 years
- •Atrial arrhythmia with hospitalization for rapid ventricular response, prior 1 year
- •Heart rate >100 bpm within the prior 3 months
- •Atrial arrhythmia with ventricular rate >90 beats per minute within the prior 3 months
- •Systolic blood pressure readings >160 mmHg within the prior 1 month, unless classified as white coat hypertension/effect (e.g., migraine prevention, anxiety symptom management, hyperthyroidism, essential tumor reduction)
- •Clinical instability (N-of-1 trials are appropriate for stable conditions only)
- •Decompensated heart failure
- •Hospitalized in the past 30 days
- •Medication changes or procedures in the prior 14 days that could confound observations/data at Principal Investigator discretion
- •Anticipated medication changes or procedures in subsequent 3 months that could confound observations/data at PI discretion
- •Clinical instability from other medical issues
- •Estimated life expectancy <6 months
- •Moderate-severe dementia or psychiatric disorder precluding informed consent
- •Language barrier that will preclude informed consent and ability to comprehend study procedures
- •Non-compliance or inability to complete study procedures
- •Enrollment in a clinical trial not approved for co-enrollment
- •Any condition that, in Principal Investigator or treating physician's opinion, makes the patient unsuitable for study participation
研究组 & 干预措施
On-Off Sequence
This arm will follow an On-Off sequence. This is the only arm in the study. Subjects will begin in the On phase (Period 1), where they will be on their beta-blocker (or the highest dose they can safely tolerate) as previously prescribed to the subjects by their physician. Subjects will then continue to the Off phase (Period 2) where they will down-titrate their beta-blocker by 50% each week until they are completely off the drug (or the lowest dose they can safely tolerate) for a total of two weeks. At the end of Period 2, the subjects will have their End of Intervention visit to determine if they would like to continue or discontinue their beta-blockers for the foreseeable future.
干预措施: Beta blocker (Drug)
结局指标
主要结局
The change in exercise capacity when on beta-blocker versus when off beta-blocker, as measured by peak oxygen consumption (VO2) during Cardiopulmonary Exercise Test (CPET).
时间窗: End of Period 1 (Week 2, 3, 4, 5, or 6) and Period 2 (Week 8, 9, 10, 11, or 12)
To understand the changes in exercise capacity between the On and Off phase via a Peak oxygen consumption (VO2) Cardiopulmonary Exercise Test. Cardiopulmonary exercise testing (CPET) measures breath-by-breath oxygen production during symptom-limited exercise on a stationary bike or treadmill. This permits calculation of peak oxygen consumption (VO2). Percent predicted peak VO2 for body weight will also be calculated.
The change in patient-reported health status when on beta-blocker versus when off beta-blocker, as measured by Kansas City Cardiomyopathy Questionnaire (KCCQ-12).
时间窗: Baseline, End of Period 1 (Week 2, 3, 4, 5, or 6), End of Period 2 (Week 8, 9, 10, 11, or 12)
The Kansas City Cardiomyopathy Questionnaire (KCCQ-12) is a heart failure-specific health status survey. Questions are ranked on 5- to 7-point Likert scales, with higher scores indicating better health status.
The change in patient-reported quality of life when on beta-blocker versus when off beta-blocker, as measured by the EuroQol-5d Visual Analogue Scale.
时间窗: Baseline; End Period 1 (Weeks 2, 3, 4, 5, or 6), End of Period 2 (Weeks 8, 9, 10, 11, or 12)
The EuroQol-5D Visual Analogue System (EQ-5D VAS) indicates patient-perceived health on a vertical visual analogue scale. The scale ranges from 0, indicating poorest health, to 100, indicating best health.
次要结局
- Change in patient-reported quality of life when on beta-blocker, as measured by the Patient-Reported Outcome Measurement Information System-29 (PROMIS-29)(Baseline; Weekly for up to 12 weeks; End of Period 1 (Week 2, 3, 4, 5, or 6), Period 2 (Week 8, 9, 10, 11, or 12))