Percutaneous Right Ventricular Assist Device Using the TandemHeart ProtekDuo: Real-World Experience

BACKGROUND

Acute right ventricular (RV) failure is challenging to treat and mechanical circulatory support devices are limited. The TandemHeart ProtekDuo (THPD; TandemLife) is a novel percutaneous RV assist device that can provide 4.0 liters per minute of blood flow through venovenous extracorporeal life support. It allows venous drainage from the right atrium and reinfusion of blood into the main pulmonary artery via internal jugular vein access. We aim to provide real-world insight into disease characteristics resulting in the use of THPD for mechanical support and enhance knowledge of best practice regarding clinical management weaning and removal/exit strategies.

METHODS

We retrospectively collected data of consecutive patients who received a THPD device at our center for acute RV failure between August 2015 and February 2018.

RESULTS

Eleven patients were diagnosed with acute RV failure and required placement of THPD. The hospital length of stay ranged from 12 to 223 days. The average length of support ranged from 11 to 154 days. We observed complications such as stroke (18.2%), sepsis (63.6%), massive gastrointestinal bleed (45.5%), and heparin-induced thrombocytopenia (54.5%). These patients received on average 85 units of blood products. Survival was 82% at 30 days and 72% at 180 days. Six of the patients were successfully weaned from the THPD devices and 1 patient required venovenous extracorporeal life support.

CONCLUSIONS

This real-world experience, despite high morbidity, continues to suggest benefits of THPD for patients with severe acute RV failure.

Duration of Dual Antiplatelet Therapy in Coronary Artery Disease: a Review Article

Dual antiplatelet therapy (DAPT) following an acute coronary syndrome or after placement of a coronary artery stent is superior to aspirin alone for prevention of atherothrombotic events but carries an increased bleeding risk. DAPT should be continued for at least 12 months based on current guidelines. Recent randomized trials demonstrate reduced ischemic events including myocardial infarction (MI), stroke, and death with continued DAPT for up to 30 months or longer, particularly in the post-MI population. However, this clinical benefit is accompanied by an increased risk of bleeding. Additional trials show mixed safety and efficacy with duration of DAPT of less than 12 months. The current data emphasizes the need to individualize DAPT duration at the patient level to balance the clinical benefits of a reduced risk of cardiovascular ischemic events with the greater risk of clinically significant bleeding. Patients at an increased risk of ischemic events and a lower risk of bleeding should be strongly considered for prolonged DAPT beyond the 1 year currently recommended in the practice guidelines.

Impact of Dietary Sodium Restriction on Heart Failure Outcomes

OBJECTIVES

This study sought to evaluate the impact of sodium restriction on heart failure (HF) outcomes.

BACKGROUND

Although sodium restriction is advised for patients with HF, data on sodium restriction and HF outcomes are inconsistent.

METHODS

We analyzed data from the multihospital HF Adherence and Retention Trial, which enrolled 902 New York Heart Association functional class II/III HF patients and followed them up for a median of 36 months. Sodium intake was serially assessed by a food frequency questionnaire. Based on the mean daily sodium intake prior to the first event of death or HF hospitalization, patients were classified into sodium restricted (<2,500 mg/d) and unrestricted (≥2,500 mg/d) groups. Study groups were propensity score matched according to plausible baseline confounders. The primary outcome was a composite of death or HF hospitalization. The secondary outcomes were cardiac death and HF hospitalization.

RESULTS

Sodium intake data were available for 833 subjects (145 sodium restricted, 688 sodium unrestricted), of whom 260 were propensity matched into sodium restricted (n = 130) and sodium unrestricted (n = 130) groups. Sodium restriction was associated with significantly higher risk of death or HF hospitalization (42.3% vs. 26.2%; hazard ratio [HR]: 1.85; 95% confidence interval [CI]: 1.21 to 2.84; p = 0.004), derived from an increase in the rate of HF hospitalization (32.3% vs. 20.0%; HR: 1.82; 95% CI: 1.11 to 2.96; p = 0.015) and a nonsignificant increase in the rate of cardiac death (HR: 1.62; 95% CI: 0.70 to 3.73; p = 0.257) and all-cause mortality (p = 0.074). Exploratory subgroup analyses suggested that sodium restriction was associated with increased risk of death or HF hospitalization in patients not receiving angiotensin-converting enzyme inhibitor or angiotensin receptor blocker (HR: 5.78; 95% CI: 1.93 to 17.27; p = 0.002).

CONCLUSIONS

In symptomatic patients with chronic HF, sodium restriction may have a detrimental impact on outcome. A randomized clinical trial is needed to definitively address the role of sodium restriction in HF management. (A Self-management Intervention for Mild to Moderate Heart Failure [HART]; NCT00018005).

Impact of Physical Inactivity on Mortality in Patients With Heart Failure

The impact of physical inactivity on heart failure (HF) mortality is unclear. We analyzed data from the HF Adherence and Retention Trial (HART) which enrolled 902 patients with New York Heart Association class II/III HF, with preserved or reduced ejection fraction, who were followed for 36 months. On the basis of mean self-reported weekly exercise duration, patients were classified into inactive (0 min/week) and active (≥1 min/week) groups and then propensity score matched according to 34 baseline covariates in 1:2 ratio. Sedentary activity was determined according to self-reported daily television screen time (<2, 2 to 4, >4 h/day). The primary outcome was all-cause death. Secondary outcomes were cardiac death and HF hospitalization. There were 196 inactive patients, of whom 171 were propensity matched to 342 active patients. Physical inactivity was associated with greater risk of all-cause death (hazard ratio [HR] 2.01, confidence interval [CI] 1.47 to 3.00; p <0.001) and cardiac death (HR 2.01, CI 1.28 to 3.17; p = 0.002) but no significant difference in HF hospitalization (p = 0.548). Modest exercise (1 to 89 min/week) was associated with a significant reduction in the rate of death (p = 0.003) and cardiac death (p = 0.050). Independent of exercise duration and baseline covariates, television screen time (>4 vs <2 h/day) was associated with all-cause death (HR 1.65, CI 1.10 to 2.48; p = 0.016; incremental chi-square = 6.05; p = 0.049). In conclusion, in patients with symptomatic chronic HF, physical inactivity is associated with higher all-cause and cardiac mortality. Failure to exercise and television screen time are additive in their effects on mortality. Even modest exercise was associated with survival benefit.

Impact of insurance carrier, prior authorization, and socioeconomic status on appropriate use of SPECT myocardial perfusion imaging in private community-based office practice

BACKGROUND

The impact of health insurance carrier and socioeconomic status (SES) on the adherence to appropriate use criteria (AUC) for radionuclide myocardial perfusion imaging (MPI) is unknown.

HYPOTHESIS

Health insurance carrier's prior authorization and patient's SES impact adherence to AUC for MPI in a fee-for-service setting.

METHODS

We conducted a prospective cohort study of 1511 consecutive patients who underwent outpatient MPI in a multi-site, office-based, fee-for-service setting. The patients were stratified according to the 2009 AUC into appropriate/uncertain appropriateness and inappropriate use groups. Insurance status was categorized as Medicare (does not require prior authorization) vs commercial (requires prior authorization). Socioeconomic status was determined by the median household income in the ZIP code of residence.

RESULTS

The proportion of patients with Medicare was 33% vs 67% with commercial insurance. The rate of inappropriate use was higher among patients with commercial insurance vs Medicare (55% vs 24%; P < 0.001); this difference was not significant after adjusting for confounders known to impact AUC determination (odds ratio: 1.06, 95% confidence interval: 0.62-1.82, P = 0.82). The mean annual household income in the residential areas of patients with inappropriate use as compared to those with appropriate/uncertain use was $72 000 ± 21 000 vs $68 000 ± 20 000, respectively (P < 0.001). After adjusting for covariates known to impact AUC determination, SES (top vs bottom quartile income area) was not independently predictive of inappropriate MPI use (odds ratio: 0.9, 95% confidence interval: 0.53-1.52, P = 0.69).

CONCLUSIONS

Insurance carriers prior authorization and SES do not seem to play a significant role in determining physicians adherence to AUC for MPI.