Primary Care
Physician perspectives on preventive care, chronic disease management, and evidence-based primary care practice.
Recent Discussions
Is it safe to combine mycophenolate and adalimumab for management of pulmonary sarcoidosis in a patient that could not tolerate methotrexate?
Combination therapy is often required in patients with sarcoidosis. Combination of adalimumab with other immunosuppressants, such as methotrexate, leflunomide, azathioprine, or mycophenolate, can be used, with close monitoring of labs (CBC, CMP) and for infections.
How is transferrin saturation a reliable indicator for any parameter if serum iron is not reliable?
The question is a very good question. The Fe/TIBC must be drawn on an overnight fast including any vitamin pills containing iron. Otherwise, the serum iron is speciously elevated which in turn speciously elevates the TSAT. If those conditions are met, the TSAT is as good as the transferrin receptor ...
How reliable is the FRAX score for assessing risk of osteoporotic fractures?
FRAX model predictions are moderately good. One commonly used measure of a prediction tool's robustness is the C-statistic, which is a generalized analogue of the area under the curve. No predictive value yields C = 0.5, while perfect prediction yields c = 1.0. There are different FRAX models for di...
Should dopamine agonist treatment stop in pregnant patients with recurrent prolactinoma despite prior surgery?
That depends on the size of the residual adenoma, the distance from the optic chiasm, and on the responsiveness of the adenoma to cabergoline. If patient had surgery, I am assuming that was poorly responsive to DA. Sometimes it is prudent to stop during the first trimester, and re-start after organo...
Should oral combined contraceptives be held prior to overnight dexamethasone suppression test to rule out Cushings?
Yes, they should be stopped for one month due to an increase in cortisol levels secondary to oral estrogen-increasing CBG. However, many women will still suppress while on OCP. Therefore, an alternative approach is to do the test while on OCP and to repeat it off OCP if the test is abnormal.
How would you treat a patient with combined pre- and post-capillary pulmonary hypertension after successfully optimizing post-capillary pressures through a valvular intervention?
No good data here. First, if I'm contemplating treating this group with pulmonary vasodilators at all, I would like to see repeat RHC demonstrating precapillary pulmonary hypertension with a low wedge. Fixing the valvular disease may help with left-sided function, but many of these patients have dev...
What work-up do you recommend in patients with early-onset dementia?
After a thorough history (especially drugs, alcohol and Family Hx) - would do: imaging study, TSH, B12 level and consider genetic labs and CSF for early onset dementia.
Does biotin interfere with the measurement of other metabolites of the Vitamin D pathway outside of the 25-hydroxy Vitamin D assay?
Biotin interferes with chemiluminescent assays. Assays using LCMS to measure 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D, and 24,25-dihydroxyvitamin D are not affected.
Do you prefer assessing cystatin C or creatinine when monitoring a patient’s eGFR who is receiving chemotherapy for malignancy?
If the patient is on a drug known to interfere with creatinine handling in the renal tubules (e.g. abemaciclib), then I will intermittently check the cystatin C to differentiate true AKI from pseudo-hypercreatinemia since these drugs can also cause true AKI.
What is your approach to lab and imaging monitoring in a patient with an elevated creatinine following a unilateral nephrectomy?
One should expect some elevation in serum creatinine after unilateral nephrectomy in the majority of patients. Hyperfiltration seems to be universal but is often not complete. Over time, the serum creatinine stabilizes and often improves some but likely not to baseline. I would repeat serum creatini...