Valve job W. Randolph Chitwood MD Professor and Chairman, Department of Surgery East Carolina University School of Medicine Greenville, NC Wylie Nifong MD Assistant Professor, Cardiothoracic Surgery East Carolina University School of Medicine Greenville, NC
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Valve job W. Randolph Chitwood MD Professor and Chairman, Department of Surgery East Carolina University School of Medicine Greenville, NC Wylie Nifong.
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Valve jobW. Randolph Chitwood MD
Professor and Chairman, Department of SurgeryEast Carolina University School of MedicineGreenville, NC
Wylie Nifong MDAssistant Professor, Cardiothoracic SurgeryEast Carolina University School of MedicineGreenville, NC
Despite rapid advances in minimally invasive techniques in other surgical specialties, cardiac surgeons have lagged behind in developing minimal access methods.
Cardiac surgery has traditionally been done through larger breast-bone incisions to allow full access to the heart.
Advances in less invasive cardiac surgery are now being made both in Europe and the United States.
The earliest minimally invasive procedures were done through smaller incisions, using the surgeon's eyes and hands.
Procedures then developed using videoscopic screens, but still using long instruments.
Minimally invasive proceduresCardiac surgery
Robotic surgery
Robotic or computer-enhanced operations are the next step.
Hand motions the surgeon makes while sitting at a console are transmitted through computer to instruments within the patient’s chest cavity.
Instead of long instruments, microwrists, extensions of the human wrist, are used to perform procedures.
From June 1996 to December 1998, 129 patients with non-ischemic mitral valve disease underwent 3D-video-assisted mitral valve surgery via a 4-cm right lateral minithoracotomy using femoro-femoral bypass and endoaortic clamping.
Group 1: port-access minimally invasive surgery the first 62 patients who underwent the procedure
Group 2: port-access robot-assisted solo surgery catheter design was modified and the procedure
was redefined and simplified after the initial 62 patients
the procedure was completed as robot-assisted solo surgery, without an additional assistant
2 years of mitral valve surgery
Mohr FW, et al. Eur J Cardiothorac Surg 1999;15(3):233-238
The German experience
Mohr FW, et al. Eur J Cardiothorac Surg 1999;15(3):233-238
ResultsGroup 1 (n=62)
Group 2 (n=67) p value
Time for surgery (min) 188 52 152 56 <0.005
Clamp time (min) 69 26 48 16 <0.002
Intubation time (h) 19 7 14 6 <0.002
ICU time (days) 2.3 1.6 1.3 0.9 <0.002
Hospitalization (days) 13 3 10 3 <0.002
Mean survival (95% CI)
Group 1 (n=62) 88.7%* at 804 35 days (735–873)
Group 2 (n=37) 97.0% at 568 12 days (553–600)
*partially procedure related (aortic dissection in 2 patients)
FDA-approved trial
The first Specific Investigational Device Exemption (IDE) clinical trials are being performed with the da Vinci device at the Ohio State University Medical Center in Columbus, Ohio, and at East Carolina University/Pitt Memorial Hospital in Greenville, North Carolina.
The FDA approved a protocol for 10 microvalve operations.
Microvalve surgery using the articulated wrist
A tiny camera with multiple lenses, inserted into the patient's chest, provides a 3-dimensional image of the heart.
The surgeon, at a nearby computer workstation, can see inside the chest through a viewport and uses a pair of joysticks to control the robotic arms.
Schematic illustration of a robotic operative setup. Surgeon seated at console operating on the master manipulator controlling motions of the robotic arms via computer interface.
The ultimate goals are to make cardiac surgery less debilitating and to shorten the recovery period.
With videoscopic procedures, the hospitalization period dropped from 7 days to 3.5 days.
With robotic devices, the hospitalization period will probably drop to 2.5–3 days.
Faster recovery
The AESOP scope
The FDA-approved AESOP (Automated Endoscope System for Optimal Positioning) is a single voice-controlled robotic arm that understands 23 simple commands such as "move up," "right," "left," "back," "return," and "move in."
Patients who had surgery with the AESOP did much better
significantly shorter stay in ICU
significantly reduced time on ventilator
significantly fewer blood transfusions
shorter hospital stay (mean of 3.8–3.9 days vs 8 days for conventional sternotomy incision)
Because patients had fewer complications and were discharged from hospital sooner, AESOP procedures actually cost 28%–33% less than standard mitral valve surgery.
Faster recovery and cost effective
Micro-mitral operation
The Micro-mitral operation begins with cardiopulmonary bypass established through femoral arterial and venous cannulas inserted under direct vision using the Seldinger technique.
The heart is accessed through a 6-cm right lateral minithoracotomy (or "instrumentation port") made in the 4th intercostal space at the anterior axillary line.
Either a 5-mm 2-dimensional endoscopic rod-lens camera with screen monitor or a 3-dimensional digital camera with a head-mounted display is used for intracardiac visualization and to guide instrument manipulation.
Aortic cross clamping is performed through the intact chest wall using a special transthoracic clamp with sliding rod design.