Search Results - "Yeragani, Vikram Kumar"

Decreased coherence in higher frequency ranges (beta and gamma) between central and frontal EEG in patients with schizophrenia: A preliminary report by Yeragani, Vikram Kumar, Cashmere, David, Miewald, Jean, Tancer, Manuel, Keshavan, Matcheri S.

“…Schizophrenia is associated with a dysfunction of cognitive integration that may be due to abnormalities in inhibitory neural circuitry. A previous study found…”
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Diminished chaos of heart rate time series in patients with major depression by Yeragani, Vikram Kumar, Rao, K.A.Radha Krishna, Smitha, M.Ramesh, Pohl, Robert B., Balon, Richard, Srinivasan, K.

“…Background: Depression and anxiety have been linked to serious cardiovascular events in patients with preexisting cardiac illness. A decrease in cardiac vagal…”
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Increased pulse-wave velocity in patients with anxiety: implications for autonomic dysfunction by Yeragani, Vikram Kumar, Tancer, Manuel, Seema, K.P., Josyulab, Krishnapriya, Desai, Nagaraj

“…Decreased vagal function is associated with vascular dysfunction. In this study, we compared vascular indices and correlated heart rate and QT variability…”
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Heart rate and QT interval variability: abnormal alpha-2 adrenergic function in patients with panic disorder by Yeragani, Vikram Kumar, Tancer, Manuel, Uhde, Thomas

“…Anxiety disorders are associated with an increase in cardiovascular mortality. Studies using heart rate (HR) and QT interval variability measures suggest a…”
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Decreased nonlinear complexity and chaos during sleep in first episode schizophrenia: a preliminary report by Keshavan, Matcheri S., Cashmere, J.David, Miewald, Jean, Yeragani, Vikram Kumar

“…Schizophrenia is characterized by disturbed sleep architecture. It has been thought that sleep abnormalities may underlie information processing deficits…”
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Nonlinear measures of respiration: respiratory irregularity and increased chaos of respiration in patients with panic disorder by Yeragani, Vikram Kumar, Radhakrishna, Rao K A, Tancer, Manuel, Uhde, Thomas

“…Respiratory irregularity has been previously reported in patients with panic disorder using time domain measures. However, the respiratory signal is not…”
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Paroxetine decreases respiratory irregularity of linear and nonlinear measures of respiration in patients with panic disorder. A preliminary report by Yeragani, Vikram Kumar, Rao, Radhakrishna, Tancer, Manuel, Uhde, Thomas

“…Previous studies indicate that serotonin reuptake inhibitors do not appear to have serious cardiac side effects. However, the effects of these agents on…”
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Decreased chaos and increased nonlinearity of heart rate time series in patients with panic disorder by Rao, Radhakrishna K.A, Yeragani, Vikram Kumar

“…In this study, we investigated measures of nonlinear dynamics and chaos of heart rate time series in 30 normal control subjects and 36 age-matched patients…”
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Nonlinear measures of QT interval series: novel indices of cardiac repolarization lability: MEDqthr and LLEqthr by Yeragani, Vikram Kumar, Radhakrishna Rao, K.A.

“…In this study, we investigated nonlinear measures of chaos of QT interval time series in 28 normal control subjects, 36 patients with panic disorder and 18…”
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Twenty-four-hour QT interval variability: increased QT variability during sleep in patients with panic disorder by Yeragani, Vikram Kumar, Pohl, Robert, Balon, Richard, Jampala, V C, Jayaraman, Anusha

“…Recent studies on beat-to-beat QT interval variability (QTV) have shown that it can be used as a noninvasive measure of cardiac repolarization lability. It is…”
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Nonlinear measures of heart rate time series: influence of posture and controlled breathing by Radhakrishna, R.K.A., Narayana Dutt, D., Yeragani, Vikram Kumar

“…In this study, we investigated measures of nonlinear dynamics and chaos theory in regards to heart rate variability in 27 normal control subjects in supine and…”
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Heart rate time series: decreased chaos after intravenous lactate and increased non-linearity after isoproterenol in normal subjects by Yeragani, Vikram Kumar, Rao, Radhakrishna, Jayaraman, Anusha, Pohl, Robert, Balon, Richard, Glitz, Debra

“…In this study, we reanalyzed our previous heart rate time series data on the effects of intravenous sodium lactate ( n=9) and intravenous isoproterenol ( n=11)…”
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Exaggerated differences in pulse wave velocity between left and right sides among patients with anxiety disorders and cardiovascular disease by Yeragani, Vikram Kumar, Kumar, Rahul, Bar, Karl Juergen, Chokka, Pratap, Tancer, Manuel

“…To compare the left-right differences in pulse wave velocity (PWV) measures in normal controls and patients with anxiety disorders and cardiac disease. Pulses…”
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Effect of nortriptyline and paroxetine on measures of chaos of heart rate time series in patients with panic disorder by Yeragani, Vikram Kumar, Rao, Radhakrishna

“…Tricyclic antidepressants have notable cardiac side effects, and this issue has become important due to the recent reports of increased cardiovascular…”
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Relationship between Beat-to-Beat Variability of RT-Peak and RT-End Intervals in Normal Controls, Patients with Anxiety, and Patients with Cardiovascular Disease by Yeragani, Vikram Kumar, Berger, Ronald, Desai, Nagaraj, Bar, Karl Juergen, Chokka, Pratap, Tancer, Manuel

“…Background: Some studies suggest that it is important to take the end of “T” wave to quantify QT‐interval variability, which signifies cardiac repolarization…”
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CIRCADIAN CHANGES IN THE QT VARIABILITY INDEX IN THE BEAGLE DOG by Nolan, Emily R, Girand, Michael, Bailie, Marc, Yeragani, Vikram Kumar

“…SUMMARY 1. QT variability is a non‐invasive marker of cardiac repolarization lability and a higher QT variability is associated with sudden death. No data…”
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Effect of mechanical coronary reperfusion on QT dispersion in acute coronary syndrome by Chander, Sumeet, Kumar, Rahul, Jorapur, Vinod, Desai, Nagaraj, Rao, Medha, Yeragani, Vikram Kumar

“…The time for cardiac repolarization and homogeneity of repolarization on surface electrocardiogram is denoted by QT interval and QT dispersion, respectively…”
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Significant difference in beat-to-beat QT interval variability among different leads by Yeragani, Vikram Kumar, Tancer, Manuel E, Glitz, Debra, Uhde, Thomas, Desai, Nagaraj

“…QT interval on the surface electrocardiogram (ECG) reflects the time for repolarization of myocardium, and QTc prolongation is strongly associated with sudden…”
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