{"id":4648,"date":"2016-08-30T00:00:00","date_gmt":"2016-08-30T06:00:00","guid":{"rendered":"https:\/\/www.uchealth.org\/today\/2016\/08\/30\/new-uch-heart-failure-specialist-takes-the-pulse-of-lvads\/"},"modified":"2021-07-08T11:40:43","modified_gmt":"2021-07-08T17:40:43","slug":"new-uch-heart-failure-specialist-takes-the-pulse-of-lvads","status":"publish","type":"post","link":"https:\/\/www.uchealth.org\/today\/new-uch-heart-failure-specialist-takes-the-pulse-of-lvads\/","title":{"rendered":"New UCH heart failure specialist takes the pulse of LVADs"},"content":{"rendered":"
<\/div>

With the recent addition of William Cornwell, MD<\/a>, University of Colorado Hospital has expanded its team of advanced heart failure specialists, already the largest in the state. In addition to bolstering the team\u2019s clinical and educational expertise, Cornwell brings a strong interest in a promising new avenue of research for both UCH and UCHealth.<\/p>\n

Cornwell, 34, recently completed a five-year advanced heart failure fellowship at University of Texas Southwestern Medical Center in Dallas. During his time there, he specialized in cardiac transplantation and in left ventricular assist devices (LVADs), the mechanical circulatory support systems that play a crucial role in meeting what he called \u201cthe enormous unmet need\u201d of patients with failing hearts.<\/p>\n

\"\"
William Cornwell, MD, joined UCH\u2019s team of advanced heart failure specialists in July. He plans to study the effects of exercise on heart failure patients equipped with LVADs.<\/figcaption><\/figure>\n

His work led Cornwell to ponder a surprising potential downside of LVADs. He observed that the devices are designed to restore cardiac output to normal levels in patients with failing hearts. They are capable of pumping up to 10 liters of oxygenated blood to the body. Yet he saw that some patients with LVADs still had symptoms of heart failure and struggled with everyday activities.<\/p>\n

Paying at the pump<\/strong><\/p>\n

If the LVAD successfully does the job of a healthy heart, why should patients still have problems? One possible answer, Cornwell said, is that an LVAD leaves a patient without a defining feature of a real heart: a pulse.<\/p>\n

Literature shows that the lack of a pulse \u201ccan have subtle implications on the body,\u201d Cornwell said. These include changes in the structure of blood vessels that may increase the risk of strokes and gastrointestinal bleeding in LVAD patients.<\/p>\n

It\u2019s a surprising problem for heart failure specialists and other clinicians to be facing in 2016, Cornwell said. While other cardiac devices, such as defibrillators and pacemakers, respond to changes in heart rate during times of rest and exertion, even the most advanced LVADs \u201care just pumps,\u201d he said. \u201cThey can\u2019t account for needed increases in blood flow. They don\u2019t really talk to the heart.\u201d<\/p>\n

The building blocks are in place for Cornwell and his colleagues at UCH to deepen understanding of the chronic effects of pulseless blood flow in patients with LVADs. Cornwell has a five-year grant from the National Institutes of Health to study the effects of mechanical circulatory support devices on exercise capacity in heart failure patients. He\u2019ll have a research lab in the Clinical and Translational Research Center on the 12th floor of Anschutz Inpatient Pavilion 1 for that purpose.<\/p>\n

Heart of the matter<\/strong><\/p>\n

He\u2019ll also collaborate with Amrut Ambardekar, MD<\/a>, medical director of the Cardiac Transplant Program at UCH and a cardiovascular disease specialist with the CU School of Medicine. Ambardekar has worked with bioengineers at CU to measure the properties of blood vessels in patients fitted with LVADs who receive heart transplants. They use tissue rings taken from aortic and pulmonary vessels in the patients\u2019 damaged hearts, which otherwise would be discarded after transplant.<\/p>\n

The salvaged material has yielded valuable information about changes in the vessels that might be linked to the LVADs and the banishment of a normal pulse, Ambardekar said. For example, elasticity tests of the artery rings show that the tissue from LVAD patients is often stiffer and less resilient than might be expected with normal aging. The tests have also revealed rapid increases in scarring of the vessels, Ambardekar said.<\/p>\n

Cornwell is among the few clinicians nationally doing exercise studies on patients with LVADs, Ambardekar said. He believes the work will help to resolve some of the unanswered questions surrounding the long-term effects of the devices. It\u2019s also part of a broader examination of the \u201cunintended consequences of an engineering marvel,\u201d as Ambardekar put it.<\/p>\n

He noted that the original mechanical circulatory devices did generate a pulse in patients. But they were very large, difficult to handle, and not very durable. They generally broke down in 12 to 18 months, a testament to nature\u2019s exquisite engineering.<\/p>\n

\u201cThe heart is a very powerful machine,\u201d Ambardekar said.<\/p>\n

Revving up the research<\/strong><\/p>\n

The next generation of devices produced continuous flow, reducing the number of moving parts and increasingly their longevity many times over. But they eliminated the pulse, perhaps creating a new set of problems that the Heartmate 3, now in clinical trials at UCH and other institutions, attempts to address with so-called artificial pulse technology designed to imitate normal blood flow.<\/p>\n

For Cornwell, the ideal solution would be a device that responds to changes in a patient\u2019s activity and heart rate with the push of a button. He foresees working with cardiovascular specialists like Ambardekar, his heart failure colleagues, exercise physiologists, device manufacturers, bioengineers, and others interested in finding new treatment paths.<\/p>\n

\u201cThere are any number of experts in their respective fields here that I want to learn from,\u201d Cornwell said, citing as examples Michael Bristow, MD<\/a>, who participated in studies in the late 1990s<\/a> suggesting the effectiveness of beta blockers as therapy for class IV heart failure patients; and Wendy Kohrt, PhD, a leading researcher in exercise physiology and aging.<\/p>\n

New endeavors<\/strong><\/p>\n

Colorado is the latest stop along a road that beckoned Cornwell long ago. \u201cFor as long as I can remember, I wanted to be physician,\u201d he said. After earning his undergraduate degree in biochemistry at Ohio State University, he considered pursuing a PhD in that field, but decided in favor of his early aspiration and completed a residency in internal medicine at the University of Michigan.<\/p>\n

With a desire to apply his scientific knowledge in the service of improving lives, heart failure seemed a field ripe with possibilities, Cornwell said.<\/p>\n

\u201cIt\u2019s an incredibly dynamic environment with very high highs and very low lows,\u201d he said. He said he reminds himself that for each heart failure patient who survives to a successful transplant, there is a corresponding story of loss.<\/p>\n

\u201cWe can tell someone who is on death\u2019s door in a phone call, \u2018There is a heart for you,\u2019\u201d Cornwell said. \u201cBut for that to happen, someone else had to die.\u201d<\/p>\n

He\u2019ll spend the coming months caring for patients in the hospital and clinic, educating students and residents, and setting up the lab to conduct his research. In between, Cornwell said he plans to spend as much time outdoors as possible with wife Amanda and their three kids, ages 8, 6, and 1. They\u2019ve already had their first mountain fishing excursion, he said.<\/p>\n

He feels similarly settled in his professional choice. \u201cAs I look around, I see cardiology as a unique fusion of physiology and advanced technologies,\u201d Cornwell said. \u201cWhere cardiology will go over the course of my career will be fascinating.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

With the recent addition of William Cornwell, MD, University of Colorado Hospital has expanded its team of advanced heart failure specialists, already the largest in the state. In addition to bolstering the team\u2019s clinical and educational expertise, Cornwell brings a strong interest in a promising new avenue of research for both UCH and UCHealth. Cornwell, […]<\/p>\n","protected":false},"author":2143,"featured_media":3159,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[8],"tags":[84,495,3512],"class_list":["post-4648","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-cardiology","tag-electrophysiology","tag-heart-and-vascular-care-cardiovascular"],"acf":[],"yoast_head":"\nNew UCH heart failure specialist takes the pulse of LVADs - UCHealth Today<\/title>\n<meta name=\"description\" content=\"With the recent addition of William Cornwell, MD, University of Colorado Hospital has expanded its team of advanced heart failure specialists, already the largest in the state. 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