Cardiology
Expert discussions on heart failure, arrhythmias, interventional procedures, and cardiovascular risk management.
Recent Discussions
How do you use IVC caliber and collapsibility to guide decisions about diuresis?
I use IVC caliber in conjunction with my lung exam to assist with the assessment of right and left atrial pressures respectively. The IVC assessment has many caveats in different patient populations, and evaluation with POCUS can be done in two planes to better understand IVC shape.Caveats - IVC siz...
For atrial fibrillation patients with high risk of CVA who cannot tolerate full dose AC due to bleeding, do you consider low dose/extended dosing anticoagulation even if they do not meet age/GFR criteria for a dose reduction, if Watchman is not readily available as an option?
Most drugs, including anticoagulants, have a dose-response. Therefore, one could argue that even though DOACs were not studied at low doses, except in defined sub-groups such as the very elderly, using such a dose in other situations may have some benefit. The problem is that without data, we simply...
What is your approach to secondary stroke prevention in patients with atrial fibrillation and intracranial stenosis (>70%)?
The patient clearly needs to be on an anticoagulant for stroke prevention with atrial fibrillation and I would choose apixaban. If an antiplatelet is added to the apixaban, the risk of a major bleeding side effect is significantly increased. It is uncertain if apixaban is effective in reducing the r...
Would you ever consider switching a patient with an LVAD from warfarin to Eliquis, such as in the setting of recurrent GI bleeds?
In general, warfarin remains the agent of choice in VAD patients. However, in patients with INR non-adherence or recurrent GI bleeds, it is an option. In this situation, ensure that GI bleeding is stopped and start 2-3 days after warfarin is stopped. Monitoring with anti-factor Xa monitoring can be ...
How do you recommend mitigating the risks of using beta blocker and clonidine therapy in combination for management of hypertension?
Beta blockers vary in lipophilicity, which affects blood-brain barrier permeability. Propranolol and metoprolol readily cross the blood-brain barrier, while other beta-blockers like nebivolol do not. The CNS side effects of fatigue, depression, and insomnia are more likely to worsen if using a lipop...
Would you consider starting with 12 mg of adenosine rather than 6 mg in a hemodynamically stable patient with SVT?
I know of no data to support higher dose adenosine for SVT termination for any particular clinical scenario. There is a rationale for administering 12 mg if an initial 6 mg doesn't work. In any case, it hardly matters because adenosine is safe at either dose. Any changes in blood pressure or proarrh...
How do you counsel patients with postural orthostatic tachycardia syndrome (POTS) regarding safe and effective exercise regimens?
It depends on where they're starting from. If they're starting from scratch, I give them two recommendations: first is the Children's Hospital of Philadelphia protocol, and if they live in town, I refer them to our PT facility at Vanderbilt (The Dayani Center) to have our PT folks help them get star...
How do you use NT-proBNP in patients with chronic kidney disease or end-stage kidney disease, given that these conditions can affect NT-proBNP levels?
NT-proBNP is most useful for (a) diagnostic uncertainty in patients who present with dyspnea, and (b) prognostication in heart failure. It is released as a result of ventricular wall stress. In CKD, the clearance of NT-proBNP is impaired, leading to elevated levels. In late-stage CKD and ESRD, volum...
How soon following pacemaker implantation can patients safely undergo elective cardioversion?
That is a good question. From a technical standpoint, a cardioversion can be done at any time after a pacemaker implantation. In the past, we often did defibrillation threshold testing on patients on the EP lab table after implanting an ICD and sometimes they would require a shock externally. This w...
Do you recommend transitioning elderly patients from thiazide diuretics to alternative agents when managing hypertension given the increased concern for hyponatremia in this patient population?
In short, no.If hyponatremia from a thiazide occurs, which is rare (~2% among individuals in the intensive treatment arm of SPRINT), it is more likely to be in the first month after thiazide initiation. Hyponatremia occurring in an individual with chronic thiazide use very likely represents the pres...