Disease relevance of Photoplethysmography

• The purpose of this study was to compare the utility of infrared photoplethysmography, intravenous fluorescein, and Doppler ultrasound in assessing intestinal ischemia in an operative canine model [1].
• To noninvasively assess the hemodynamic effects of VVI and DDD pacing modes we measured beat-to-beat arterial blood pressure during VVI and DDD pacing in 30 patients with complete heart block (CHB), using fingertip photoplethysmography [2].
• METHODS: In 36 patients with primary and secondary axillary-subclavian vein thrombosis were used a 4006 GE (Milwaukee, USA) colour duplex ultrasonography and an AV-1000 Hemodynamics instrument for the light reflection rheography for diagnosis and follow-up [3].

High impact information on Photoplethysmography

• METHODS: Twenty sexually functional women participated in 2 experimental conditions in which subjective (self-report) and physiological (vaginal photoplethysmography) sexual responses to erotic stimuli were measured following administration of either ephedrine sulfate (50 mg) or placebo in a randomized, double-blind, cross-over protocol [4].
• Similarly, a pharmacodynamic model was applied to the 7360 effect measurements, i.e. the decrease of peak blood pressure response to intravenous angiotensin challenge recorded by finger photoplethysmography [5].
• After six weeks on diet the vasodilator responses to acetylcholine and glyceryl trinitrate were measured by photoplethysmography of the rabbit ear [6].
• Noninvasive assessment of local nicotinate pharmacodynamics by photoplethysmography [7].
• Indirect systolic blood pressure was measured by photoplethysmography in unanesthetized mice fed either a basal or high salt diet, and found to be significantly higher in iNOS-deficient mice than in wild type controls at three months of age (P=0.038 (basal diet) and P=0.0005 (high salt diet)) [8].

Biological context of Photoplethysmography

• Vasodilatation elicited by topical application of methyl nicotinate was measured by photoplethysmography at various positions on human ventral forearm skin [9].
• EEG spectral entropy, heart rate, photoplethysmography and motor responses to skin incision during sevoflurane anaesthesia [10].
• The following parameters were studied without and with exposure to cold conditions: hemodynamics (finger photoplethysmography), red cell deformability (filtration test), various clotting variables (prothrombin activity, antithrombin III, plasma fibrinogen, partial thromboplastin time, thrombin time, thrombelastogram), and clinical symptomatology [11].

Associations of Photoplethysmography with chemical compounds

• Since none of these quantifies intestinal blood flow, we measured flow at the detection thresholds of Doppler ultrasound, photoplethysmography, and intravenously administered fluorescein, perfused the intestines at these threshold levels, and assessed histologic evidence of ischemic damage [12].
• In 20 patients scheduled for extracorporeal shock wave lithotripsy (ESWL), the onset of sympathetic blockade after epidural anaesthesia (catheter insertion at the presumed level L2-L3, and injection of 20 ml prilocaine 2% with epinephrine 5 micrograms/ml) was objectively evaluated by photoplethysmography [13].
• Photoplethysmography proved to be a very efficient and inexpensive method of studying the effects of pentoxifylline [14].
• Transmitted-light photoplethysmography (TLP) was applied to teeth in situ using a tungsten light, or one of two light-emitting diodes (LED) with peak wavelengths of 565 and 695 nm [15].
• In a randomized, placebo-controlled, crossover study, 15 ambulatory patients with Raynaud's phenomenon, treated for three weeks with ketanserin 80 mg/day and pentoxiphylline 1,200 mg/day, were evaluated by subjective symptom scores, daily frequency and duration of attacks, and photoplethysmography, at room temperature and after cold test [16].

Gene context of Photoplethysmography

• METHODS: We measured toe pressure (TSP) and ankle/brachial index (ABI) and recorded PW with photoplethysmography in 358 limbs of 182 patients [17].
• Sixty-nine patients with primary varicose veins, LSV reflux and SFJ incompetence, confirmed by duplex ultrasonography and photoplethysmography, were studied [18].
• Potential application of photoplethysmography technique in evaluating microcirculatory status of STAMP patients: preliminary report [19].
• We have examined 30 patients, who were diagnosed clinically and electromyographically as having idiopathic CTS, for the presence of RP using a cold provocation test with photoplethysmography [20].
• Photoplethysmography. Part 2. Influence of light source wavelength [21].

Analytical, diagnostic and therapeutic context of Photoplethysmography

• We performed a bicycle ergometer exercise test, continuously monitoring blood pressure via non-invasive finger photoplethysmography (Finometer, FMS, The Netherlands) [22].
• In addition, dermal blood flow was analyzed by acral photoplethysmography (APPG) and laser Doppler flowmetry (LDF) in the right ear lobe of five normal volunteers and during epinephrine supplemented Auto-TLA [23].

References