Esophageal temperature monitoring during radiofrequency catheter ablation: experimental study based on an agar phantom model.


:Although previous studies have established the feasibility of monitoring esophageal temperature during radiofrequency cardiac ablation using an esophageal temperature probe (ETP), some questions remain regarding its efficacy. The aims of this study were to study the effect of the location of the ETP on the temperature reached, and to test the characteristics of ETP as used in clinical practice. We constructed an agar phantom to model the thermal and electrical characteristics of the biological tissues (left atrium, esophagus and connective tissue). The ETP was positioned at 6.5 mm from an ablation electrode and at distances of 0, 5, 10, 15, 20 mm from the catheter axis. A thermocouple was located on the probe to measure the actual temperature of the external esophageal layer during the ablations (55 degrees C, 60 s). The mean temperatures reached at the thermocouple were significantly higher than those measured by the ETP (48.3 +/- 1.9 degrees C versus 39.6 +/- 1.1 degrees C). The temperature values measured with the ETP were significantly lower when the probe was located further from the catheter axis (up to 2.5 degrees C lower when the distance from the probe-catheter axis was 2 cm). The dynamic calibration of the ETP showed a mean value for the time constant of 8 s. In conclusion, the temperature measured by the ETP always underestimates the temperature reached in the thermocouple. This fact can be explained by the distance gap between the thermocouple and probe and by the dynamic response of the ETP. The longer the distance between the ETP and catheter axis, the higher is the temperature difference.


Physiol Meas


Rodríguez I,Lequerica JL,Berjano EJ,Herrero M,Hornero F




Has Abstract


2007-05-01 00:00:00














  • In vivo quantification of accumulating abdominal fluid using an electrical impedance tomography hemiarray.

    abstract::A new method to image and quantify intra-abdominal haemorrhage using electrical impedance tomography (EIT) was tested in vivo. Supine peritoneal dialysis patients were monitored using an 8-electrode hemiarray placed on the anterior abdomen. EIT measurements were recorded using the EPack II data acquisition system befo...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Tucker AS,Ross EA,Paugh-Miller J,Sadleir RJ

    更新日期:2011-02-01 00:00:00

  • Characteristic impedance: frequency or time domain approach?

    abstract:OBJECTIVE:Characteristic impedance (Zc) is an important component in the theory of hemodynamics. It is a commonly used metric of proximal arterial stiffness and pulse wave velocity. Calculated using simultaneously measured dynamic pressure and flow data, estimates of characteristic impedance can be obtained using metho...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Qureshi MU,Colebank MJ,Schreier DA,Tabima DM,Haider MA,Chesler NC,Olufsen MS

    更新日期:2018-01-31 00:00:00

  • Aging in autonomic control by multifractal studies of cardiac interbeat intervals in the VLF band.

    abstract::The heart rate responds dynamically to various intrinsic and environmental stimuli. The autonomic nervous system is said to play a major role in this response. Multifractal analysis offers a novel method to assess the response of cardiac interbeat intervals. Twenty-four hour ECG recordings of RR interbeat intervals (o...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Makowiec D,Rynkiewicz A,Wdowczyk-Szulc J,Zarczyńska-Buchowiecka M,Gałaska R,Kryszewski S

    更新日期:2011-10-01 00:00:00

  • Validity and reliability of a timed 5 km cycle ergometer ride to predict maximum oxygen uptake.

    abstract::The purpose of this study was to determine the validity and reliability of a timed 5 km cycle ergometer ride to predict maximum oxygen uptake (VO2max). Fifty-two healthy volunteers had their VO2max determined during a maximal treadmill run. They also performed a timed 5 km cycle ergometer ride. The resistance setting ...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章,随机对照试验


    authors: Buono MJ,Borin TL,Sjoholm NT,Hodgdon JA

    更新日期:1996-11-01 00:00:00

  • Home monitoring of within-breath respiratory mechanics by a simple and automatic forced oscillation technique device.

    abstract::Spirometry is the gold standard to determine the presence of airflow obstruction, but it requires volitional participation and needs qualified supervision. The forced oscillation technique (FOT) measures respiratory input impedance (Zrs) during spontaneous breathing and it could be useful for unsupervised monitoring o...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Dellacà RL,Gobbi A,Pastena M,Pedotti A,Celli B

    更新日期:2010-04-01 00:00:00

  • Fetal beat detection in abdominal ECG recordings: global and time adaptive approaches.

    abstract::We present a method for location of fetal QRS in maternal abdominal ECG recordings. This method's initial, global approach was proposed in the context of the 2013 PhysioNet/Computing in Cardiology Challenge where it was tested on the 447 four channel one-minute recordings.The first step is filtering to eliminate basel...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Rodrigues R

    更新日期:2014-08-01 00:00:00

  • A comparative study of several exciting magnetic fields for induced current EIT.

    abstract::In this study, the selection of coil configuration parameters (coil radius and coil centre shift) for induced current EIT using circular coils is investigated. An alternative coil configuration is suggested, which produces approximately linear (spatially) magnetic fields in order to strengthen the currents in the cent...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Gençer NG,Ider YZ

    更新日期:1994-05-01 00:00:00

  • Neural network analysis of oxygenation signals in infants during sleep.

    abstract::The use of artificial neural networks (ANNs) to interpret sleep monitoring signals is described. Recordings from ten infants with apparent life threatening episodes were assigned into training feedforward R-PROP networks. In order to separate good signal from artefact, 60 second time frames of SaO2 and TcPO2 signals w...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Taktak AF,Simpson S,Patel S,Meyer G

    更新日期:2000-08-01 00:00:00

  • Chasing the evidence: the influence of data segmentation on estimates of dynamic cerebral autoregulation.

    abstract:OBJECTIVE:Transfer function analysis (TFA) of dynamic cerebral autoregulation (dCA) requires smoothing of spectral estimates using segmentation of the data (SD). Systematic studies are required to elucidate the potential influence of SD on dCA parameters. APPROACH:Healthy subjects (HS, n = 237) and acute ischaemic str...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Panerai RB,Intharakham K,Haunton V,Minhas JS,Llwyd O,Lam M,Salinet ASM,Nogueira RC,Katsogridakis E,Maggio P,Robinson TG

    更新日期:2020-04-17 00:00:00

  • Cooperative dry-electrode sensors for multi-lead biopotential and bioimpedance monitoring.

    abstract::Cooperative sensors is a novel measurement architecture that allows the acquiring of biopotential signals on patients in a comfortable and easy-to-integrate manner. The novel sensors are defined as cooperative in the sense that at least two of them work in concert to measure a target physiological signal, such as a mu...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Rapin M,Proença M,Braun F,Meier C,Solà J,Ferrario D,Grossenbacher O,Porchet JA,Chételat O

    更新日期:2015-04-01 00:00:00

  • Impedance analyser module for EIT and spectroscopy using undersampling.

    abstract::In this paper we present the concept, the design and the test procedure for a DSP-based high-precision and high-performance wide-band (up to 10 MHz) bioimpedance analyser module for application in EIT or bioimpedance spectroscopy. The module implements a digital concept with appropriate signal conditioning hardware fo...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Dudykevych T,Gersing E,Thiel F,Hellige G

    更新日期:2001-02-01 00:00:00

  • In vitro measurements of respiratory mechanics during HFPV using a mechanical lung model.

    abstract::High-frequency percussive ventilation (HFPV) may be defined as flow-regulated time-cycled ventilation that creates controlled pressure and delivers a series of high-frequency subtidal volumes in combination with low-frequency breathing cycles. In recent years, the usefulness of HFPV has been clinically assessed as an ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Riscica F,Lucangelo U,Ferluga M,Accardo A

    更新日期:2011-06-01 00:00:00

  • Carotid flow rates and flow division at the bifurcation in healthy volunteers.

    abstract::In nine healthy subjects, magnetic resonance imaging was used to measure blood flow waveforms in the common (CCA), internal (ICA) and external (ECA) carotid arteries. Useful data were acquired from 14 carotid arteries in total. Flow rates were determined from regions of interest placed over the arteries in CINE-phase ...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Marshall I,Papathanasopoulou P,Wartolowska K

    更新日期:2004-06-01 00:00:00

  • A portable device with low-power consumption for monitoring mouse vital signs during in vivo photoacoustic imaging and photothermal therapy.

    abstract:OBJECTIVE:The aim of this study was to monitor the physiological changes and cytotoxic effects of exogenous contrast agents during photoacoustic imaging (PAI) and photothermal therapy (PTT). In this paper, a low-power telemetric device for mouse vital signs monitoring was designed and demonstrated. APPROACH:The power ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Phan DT,Phan TTV,Bui NT,Park S,Choi J,Oh J

    更新日期:2021-01-01 00:00:00

  • A clinical distortion index for compressed echocardiogram evaluation: recommendations for Xvid codec.

    abstract::This paper introduces a new clinical distortion index able to measure the decrease in diagnostic content in compressed echocardiograms. It is calculated using cardiologists' answers to a clinical testbed composed of two types of tests: one blind and the other semi-blind. This index may be used to compare clinical perf...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Alesanco A,Hernández C,Portolés A,Ramos L,Aured C,García M,Serrano P,García J

    更新日期:2009-05-01 00:00:00

  • Effect of body mass index (BMI) on estimation of extracellular volume (ECV) in hemodialysis (HD) patients using segmental and whole body bioimpedance analysis.

    abstract::The aim of the study was to investigate whether body mass index (BMI) influences the estimation of extracellular volume (ECV) in hemodialysis (HD) patients when using segmental bioimpedance analysis (SBIA) compared to wrist-to-ankle bioimpedance analysis (WBIA) during HD with ultrafiltration (UF). Twenty five HD patie...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Carter M,Morris AT,Zhu F,Zaluska W,Levin NW

    更新日期:2005-04-01 00:00:00

  • Differences in the microcirculatory effects of local skin surface contact pressure stimulation between acupoints and nonacupoints: possible relevance to acupressure.

    abstract::In the present study, laser Doppler measurement was used to quantitatively investigate the microcirculatory effects of contact pressure stimulation (PS) underneath the Hoku acupoint and its nearby nonacupoint, to improve the understanding of the mechanisms underlying acupressure therapy. A control group (no PS applied...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Hsiu H,Hsu WC,Chen BH,Hsu CL

    更新日期:2010-06-01 00:00:00

  • Age-related changes in pulse risetime measured by multi-site photoplethysmography.

    abstract:OBJECTIVE:It is accepted that changes in the peripheral pulse waveform characteristics occur with ageing. Pulse risetime is one important feature which has clinical value. However, it is unclear how it varies across the full age spectrum from child to senior and for different peripheral measurement sites. The objective...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Allen J,O'Sullivan J,Stansby G,Murray A

    更新日期:2020-08-11 00:00:00

  • Comparison of self-reported measure of sitting time (IPAQ) with objective measurement (activPAL).

    abstract::This study compared sitting time measured by a questionnaire (International Physical Activity Questionnaire; IPAQ) with concurrently measured objective sitting time from an accelerometer-based measure of thigh inclination (activPAL).Adults (n = 69), wore an activPAL for a week, and then completed the long-form 7 d rec...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Chastin SF,Culhane B,Dall PM

    更新日期:2014-11-01 00:00:00

  • Determination of Cole parameters in multiple frequency bioelectrical impedance analysis using only the measurement of impedances.

    abstract::Conventional bioimpedance spectrometers measure resistance and reactance over a range of frequencies and, by application of a mathematical model for an equivalent circuit (the Cole model), estimate resistance at zero and infinite frequencies. Fitting of the experimental data to the model is accomplished by iterative, ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Ward LC,Essex T,Cornish BH

    更新日期:2006-09-01 00:00:00

  • Predicting clinical ischaemia during awake carotid endarterectomy: use of the SJVO2 probe as a guide to selective shunting.

    abstract::Stroke is a major cause of disability within the western world. About 20% of strokes are a consequence of atheromatous narrowing of the origin of the internal carotid artery. Carotid endarterectomy has been shown to be an effective treatment for those with symptomatic and severe stenosis, provided the risk of death an...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Crossman J,Banister K,Bythell V,Bullock R,Chambers I,Mendelow AD

    更新日期:2003-05-01 00:00:00

  • Cardiac eigen imaging: a novel method to isolate cardiac activity in thoracic electrical impedance tomography.

    abstract:OBJECTIVE:As the global burden of cardiovascular disease increases, proactive cardiovascular healthcare by means of accurate, precise, continuous, and non-invasive monitoring is becoming crucial. However, no current device is able to provide cardiac hemodynamic monitoring with the aforementioned criterion. Electrical i...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Arshad SH,Murphy EK,Callahan JM,DeVries JT,Odame KM,Halter RJ

    更新日期:2020-10-06 00:00:00

  • Life-threatening false alarm rejection in ICU: using the rule-based and multi-channel information fusion method.

    abstract::False alarm (FA) rates as high as 86% have been reported in intensive care unit monitors. High FA rates decrease quality of care by slowing staff response times while increasing patient burdens and stresses. In this study, we proposed a rule-based and multi-channel information fusion method for accurately classifying ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Liu C,Zhao L,Tang H,Li Q,Wei S,Li J

    更新日期:2016-08-01 00:00:00

  • Effects of awareness and nociception on heart rate variability during general anaesthesia.

    abstract::During anaesthesia awareness and nociception are serious complications that may further lead to haemodynamic instability. Specific monitoring of depth of hypnosis and depth of analgesia based on heart rate variability (HRV) analysis is eligible to improve patient safety and reduce efforts in post-operative care. Conse...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Huhle R,Burghardt M,Zaunseder S,Wessel N,Koch T,Malberg H,Heller AR

    更新日期:2012-02-01 00:00:00

  • Airway resistance estimation by best fit analysis in very premature infants.

    abstract::Plethysmographic measurement of airway resistance (R(aw)) has been determined by single-point analysis, usually at 50% of maximum inspiratory flow (MIF). Computer-assisted (best fit) analysis, however, allows R(aw) to be calculated by applying a regression line to any portion of the plethysmograph pressure-flow loop. ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Thomas M,Greenough A,Blowes R,Rafferty GF,Calvert S,Marlow N,Peacock JL,Milner AD

    更新日期:2002-05-01 00:00:00

  • Causality in physiological signals.

    abstract::Health is one of the most important non-material assets and thus also has an enormous influence on material values, since treating and preventing diseases is expensive. The number one cause of death worldwide today originates in cardiovascular diseases. For these reasons the aim of understanding the functions and the ...

    journal_title:Physiological measurement

    pub_type: 杂志文章,评审


    authors: Müller A,Kraemer JF,Penzel T,Bonnemeier H,Kurths J,Wessel N

    更新日期:2016-05-01 00:00:00

  • A pH-mucosa area unit of measure to consider morphology of the oesophagus when evaluating oesophagitis.

    abstract::Gastro-oesophageal pH measurements are routinely carried out to quantify and determine if levels of acid reflux are responsible for symptoms. Although considered the 'gold standard', evidence suggests that pH measurements do not correlate well with the degree of oesophagitis seen during endoscopy. In this study the cu...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Haylett KR,Vales P,Lee SH,McCloy RF

    更新日期:2003-11-01 00:00:00

  • The effect of fracture and fracture fixation on ultrasonic velocity and attenuation.

    abstract::Measurement of the velocity of propagation and attenuation of ultrasound (200 kHz) is believed to be a useful non-invasive technique for assessing the mechanical properties of bone. A new method for the determination of ultrasound velocity and attenuation of longitudinal waves in cortical bone was used in vivo and in ...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Saulgozis J,Pontaga I,Lowet G,Van der Perre G

    更新日期:1996-08-01 00:00:00

  • Assessment of the dynamic interactions between heart rate and arterial pressure by the cross time-frequency analysis.

    abstract::In this study, a framework for the characterization of the dynamic interactions between RR variability (RRV) and systolic arterial pressure variability (SAPV) is proposed. The methodology accounts for the intrinsic non-stationarity of the cardiovascular system and includes the assessment of both the strength and the p...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Orini M,Laguna P,Mainardi LT,Bailón R

    更新日期:2012-03-01 00:00:00

  • Is dynamic cerebral autoregulation measurement using transcranial Doppler ultrasound reproducible in the presence of high concentration oxygen and carbon dioxide?

    abstract::Reliability of cerebral blood flow velocity (CBFV) and dynamic cerebral autoregulation estimates (expressed as autoregulation index: ARI) using spontaneous fluctuations in blood pressure (BP) has been demonstrated. However, reliability during co-administration of O2 and CO2 is unknown. Bilateral CBFV (using transcrani...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Minhas JS,Syed NF,Haunton VJ,Panerai RB,Robinson TG,Mistri AK

    更新日期:2016-05-01 00:00:00