Jul 15, 2020 · Waveform illustrations from authoritative publications demonstrating the inconsistent characterization of triphasic, biphasic, and monophasic waveform descriptors.

Feb 28, 2022 · Doppler waveforms refer to the morphology of pulsatile blood flow velocity tracings on spectral Doppler ultrasound. Waveforms differ by the vascular bed (peripheral, cerebrovascular, and visceral circulations) and the presence of disease.

Waveform characteristics are traditionally defined as multiphasic (triphasic, biphasic) and monopha-sic. The purpose of this investigation is to evaluate whether sonography professionals correctly clas-sify waveforms into these three categories.

Biphasic Waveforms The most beneficial ICD innovation, from a viewpoint of defibrillation efficacy, was the development of the biphasic defibrillation waveform (Figure 115-4). This waveform consists of the capacitor discharge divided into two phases of opposite polarity.

Today, biphasic defibrillation has largely replaced monophasic as the superior method, so much so that monophasic devices are no longer manufactured. The newest AED to hit the market, the Avive Connect AED™, uses biphasic waveform.

An atypical 2-step—rather than single curve—pattern of clot formation, which is typical of disseminated intravascular coagulation (DIC), and detected by dynamic waveform analysis of changes in light transmission or absorption (LT/A), which occurs with coagulation.

Biphasic waveforms with phase-2 capacitors of 1⁄3times that of phase 1 provided the highest defibrillation efficacy (stored energy and voltage) compared with corresponding monophasic and biphasic waveforms with the same capacitors in both phases except for waveforms with a 30-mF phase-1 capacitor.

In recent years biphasic waveforms have become more commonly used for defibrillation than monophasic waveforms. Biphasic waveforms are characterised by an initial positive current flow followed by a reversal to negative current flow.

The Stryker biphasic waveform (BTE) has been studied in nearly 2X as many cardiac arrest patients as all other manufacturers’ biphasic waveforms combined, across a wide range of impedances.*

Patients with implant-biphasic waveform inpatients needing cardioversion or edepicardial, pericardial, intr cardiac, or subcutaneous defibrillation for ventricular tachycardia (VT) orven- defibrillator patch electrodes were excluded.