The PulSentry blog
Evidence-led writing on cardiac tamponade, pulsus paradoxus, and what a pulse oximeter waveform can reveal, for clinicians, and for anyone trying to understand the science.
What is pulsus paradoxus? A clinician's guide
The definition, how it is measured, the conditions it accompanies, when it is absent, and how the same signal appears on the pulse oximeter waveform.
Read → Clinical explainerWhy echocardiography misses post-surgical tamponade
After cardiac surgery, transthoracic echo is far less sensitive than many expect. What the evidence shows, and why the post-discharge window is a blind spot.
Read → ReimbursementThe 2026 Medicare RPM CPT code guide
99453, 99454, 99457, 99458, 99091, and the new 99445, what each pays, the day-count thresholds, and how short post-discharge monitoring fits.
Read →FFT and power spectral density of the PPG waveform, explained
How a pulse-oximeter signal is transformed into the frequency domain, and what the pulsus index measures.
Coming soonCardiac tamponade after cardiac surgery: incidence, timing, detection
How often it happens, when it presents, and which patients are most at risk.
Coming soonTamponade after Watchman, ablation, and transseptal procedures
Iatrogenic tamponade risk in structural-heart and electrophysiology procedures, and the monitoring window that matters.
Coming soon