Mechanical Cardiac Support With an Implantable Direct Cardiac Compression Device: Proof of Concept.

PURPOSE: We examined the hemodynamic effects of a new, implantable, direct cardiac assist device in an ovine heart failure model. DESCRIPTION: The device, which encompasses both left and right ventricles, is inserted through the pericardial apex and self-expands to encompass the heart without suturing. The intact pericardium anchors the device in place. The device has 2 concentric chamber layers: an internal chamber layer filled with fluid to conform to the heart and an external chamber layer filled with air that provides external compression and negative pressure to aid relaxation. EVALUATION: The device was implanted in 7 sheep with heart failure induced by microsphere embolization. Cardiac performance was assessed for 6 to 8 hours. The cardiac assist device provided cardiac systolic and diastolic assistance, as shown by pressure tracings of the left ventricle and aorta, pulmonary artery flow, and +dP/dt. Central venous pressure decreased during cardiac assistance. No anatomic damage was noted postmortem. CONCLUSIONS: Systolic and diastolic cardiac assistance can be achieved with this device that compresses and relaxes in synchrony with the native cardiac cycle.

Post-Acute Care Preparedness in a COVID-19 World.

Coronavirus disease 2019 (COVID-19) has led to a surge of patients requiring post-acute care. In order to support federal, state and corporate planning, we offer a four-stage regionally oriented approach to achieving optimal systemwide resource allocation across a region's post-acute service settings and providers over time. In the first stage, the post-acute care system must, to the extent possible, help relieve acute hospitals of non-COVID-19 patients to create as much inpatient capacity as possible over the surge period. In the second stage after the initial surge as subsided, post-acute providers must protect vulnerable populations from COVID-19, prepare treat-in-place protocols for non-COVID-19 admissions, and create and formalize COVID-19 specific settings. In the third stage after a vaccine has been developed or an effective prophylactic option is available, post-acute care providers must assist with distribution and administration of vaccinations and prophylaxis, develop strategies to deliver non-COVID-19 related medical care, and begin to transition to the post-COVID-19 landscape. In the final stage, we must create health advisory bodies to review post-acute sector's response, identify opportunities to improve performance going forward, and develop a pandemic response plan for post-acute care providers. J Am Geriatr Soc 68:1150-1154, 2020.

Genome sequencing in microfabricated high-density picolitre reactors.

The proliferation of large-scale DNA-sequencing projects in recent years has driven a search for alternative methods to reduce time and cost. Here we describe a scalable, highly parallel sequencing system with raw throughput significantly greater than that of state-of-the-art capillary electrophoresis instruments. The apparatus uses a novel fibre-optic slide of individual wells and is able to sequence 25 million bases, at 99% or better accuracy, in one four-hour run. To achieve an approximately 100-fold increase in throughput over current Sanger sequencing technology, we have developed an emulsion method for DNA amplification and an instrument for sequencing by synthesis using a pyrosequencing protocol optimized for solid support and picolitre-scale volumes. Here we show the utility, throughput, accuracy and robustness of this system by shotgun sequencing and de novo assembly of the Mycoplasma genitalium genome with 96% coverage at 99.96% accuracy in one run of the machine.