Systems and methods for selectively occluding the superior vena cava for treating heart conditions
Systems and methods are provided for treating conditions such as heart failure and/or pulmonary hypertension by at least partially occluding flow through the superior vena cava for an interval spanning multiple cardiac cycles. A catheter with an occlusion device is provided along with a controller that actuates a drive mechanism to provide at least partial occlusion of the patient's superior vena cava, which reduces cardiac filling pressures, and induces a favorable shift in the patient's Frank-Starling curve towards healthy heart functionality and improved cardiac performance. The system may include sensors to determine the degree of occlusion of the superior vena cava. The occlusion system may be used to reduce volume in a heart and facilitate a cardiac procedure. The occlusion system may be used to relieve an overloaded chamber during and/or after deploying a VAD.
1. A method for modulating a heart of a patient for performing a cardiac procedure, the method comprising:
inserting a catheter comprising a flow limiting element into a superior vena cava (SVC) of the patient such that the flow limiting element is disposed within the SVC;
actuating the flow limiting element within the SVC, thereby at least partially occluding the SVC;
measuring a parameter related to the heart of the patient to generate a measured parameter;
determining whether the measured parameter satisfies a predetermined threshold; and
performing the cardiac procedure at the heart of the patient if the measured parameter is determined to satisfy the predetermined threshold.
2. The method of claim 1 , wherein determining that the measured parameter satisfies the predetermined threshold occurs before performing any part of the cardiac procedure.
3. The method of claim 1 , wherein actuating the flow limiting element within the SVC occurs at a same time as performing at least a portion of the cardiac procedure.
4. The method of claim 1 , wherein actuating the flow limiting element within the SVC occurs prior to performing the cardiac procedure at the heart of the patient.
5. The method of claim 1 , wherein performing the cardiac procedure comprises implanting a clip at a heart valve.
6. The method of claim 1 , wherein performing the cardiac procedure comprises implanting an annuloplasty ring.
7. The method of claim 1 , wherein performing the cardiac procedure comprises implanting a valve prosthetic.
8. The method of claim 1 , wherein performing the cardiac procedure comprises implanting left ventricular assist device (LVAD).
9. The method of claim 1 , further comprising introducing a second catheter to the heart via an inferior vena cava (IVC) of the patient, the second catheter adapted for performing the cardiac procedure.
10. The method of claim 1 , further comprising introducing a second catheter to the heart via a superior vena cava (SVC) of the patient, the second catheter adapted for performing the cardiac procedure.
11. The method of claim 10 , wherein the second catheter is disposed within the catheter along at least a portion of the catheter.
12. The method of claim 1 , further comprising:
determining that the measured parameter does not satisfy the predetermined threshold; and
altering an actuation parameter after determining that the measured parameter does not satisfy a predetermined threshold.
13. The method of claim 12 , further comprising:
measuring a second parameter related to the heart of the patient to generate a second measured parameter; and
determining whether the second measured parameter satisfies the predetermined threshold.
14. The method of claim 13 , further comprising confirming that the second measured parameter satisfies a predetermined threshold, wherein confirming that the second measured parameter satisfies the predetermined threshold occurs before performing the cardiac procedure at the heart of the patient.
15. The method of claim 1 , further comprising de-actuating the flow limiting element and re-actuating the flow limiting element within the SVC, thereby at least partially occluding the SVC, prior to or during the cardiac procedure.
16. The method of claim 1 , wherein actuating the flow limiting element within the SVC stimulates the vagal nerve and increases urine flow of the patient.
17. The method of claim 1 , wherein determining the measured parameter comprises:
receiving a first signal from a first sensor disposed within the SVC;
receiving a second signal from a second sensor disposed within the SVC, wherein the first sensor is an electrode disposed on the catheter proximal to the flow limiting element and the second sensor is an electrode disposed on the catheter distal to the flow limiting element.
18. A method for reducing volume overload of a heart of a patient, the method comprising:
inserting a catheter comprising a flow limiting element into a superior vena cava (SVC) of a patient such that the flow limiting element is disposed within the SVC;
implanting a left ventricular assist device (LVAD) at a left ventricle of the patient;
actuating the flow limiting element within the SVC, thereby at least partially occluding the SVC; and
de-actuating the flow limiting element a period of time after implanting the LVAD.
19. The method of claim 18 , wherein actuating the flow limiting element reduces a pressure in the heart of the patient.
20. The method of claim 18 , wherein actuating the flow limiting element reduces a volume of fluid in the right ventricle.
21. The method of claim 18 , wherein actuating the flow limiting element within the SVC occurs while implanting the LVAD.
22. The method of claim 18 , wherein actuating the flow limiting element within the SVC occurs after implanting the LVAD.
23. The method of claim 18 , wherein actuating the flow limiting element comprises inflating a balloon within the SVC.
24. The method of claim 18 , further comprising:
determining a first signal from an accelerometer disposed on the catheter, the first signal indicative of the flow limiting element at least partially occluding the SVC,
wherein the flow limiting element is deactivated based on the first signal.
25. The method of claim 18 , further comprising:
receiving a first signal from a sensor disposed on the flow limiting element, the first signal indicative of contact between the SVC and the flow limiting element; and
wherein the flow limiting element is deactivated based on the first signal.
26. The method of claim 18 , further comprising:
generating light from using a first light disposed on the catheter proximal to the flow limiting element;
determining a first signal from a light sensor disposed on the catheter distal to the flow limiting element; and
determining a degree of occlusion of the flow limiting element based on the first signal.
27. The method of claim 18 , further comprising receiving a first signal from a stretch gauge disposed on one or more of the catheter and flow limiting element, the first signal indicative of a degree of occlusion by the flow limiting element,
wherein the flow limiting element is deactivated based on the first signal.