Thermoregulation and Heart Rate Variability

Fleisher, Lee A.; Frank, Steven M.; Sessler, Daniel I.; Cheng, Christi; Matsukawa, Takashi; Vannier, Carole A.

doi:10.1042/cs0900097

Cited by 112 publications

(77 citation statements)

References 34 publications

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“…21) Changes in temperature regulation and the neuroendocrine system related to stress do occur postoperatively as well and could have also influenced HRV. 19,22) Immobility per se is unlikely to be of significance.…”

Section: Discussionmentioning

confidence: 99%

Diminished Circadian Rhythm of Heart Rate Variability After Aortic Surgery Appears to Be Independent of Myocardial Ischemia

Dworschak¹,

Lorenzl

Rapp

2003

Jpn Heart J

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SUMMARYImpaired heart rate variability (HRV) has been described postoperatively. Diminished HRV may be related to myocardial ischemia and potentially causes circulatory instability Cardiac ischemic events and a compromised cardiovascular function are not uncommon after aortic surgery. Circadian variation of HRV seems to be a prognostically more important parameter than HRV itself with respect to the development of cardiac dysfunction. We therefore investigated whether the diurnal rhythm of HRV is simultaneously altered postoperatively and the potential contribution of myocardial ischemia. After approval by the hospital ethics committee and having obtained informed consent, we studied 11 consecutive male patients undergoing elective aortic surgery. Patients were monitored with a Holter-ECG perioperatively. Spectral HRV measures (total, low, and high frequency power) were determined and night/day ratios calculated. Ischemic ECG changes were recorded and serum was sampled for troponin T analysis. A remarkable decline in circadian variation accompanied the decrease in all HRV parameters postoperatively. Five patients showed ECG changes suggestive of myocardial ischemia and two had increased levels of troponin T. These two patients showed greatly diminished HRV postoperatively with a similarly reduced circadian rhythm. We have demonstrated that the circadian rhythm of HRV is not preserved after aortic surgery. Diminished diurnal variability seems to be a general manifestation and myocardial ischemia may just be one contributing factor. An altered biorhythm in combination with stress related changes in the neuroendocrine system after surgery most likely have a more significant influence on the circadian rhythm of HRV. (Jpn Heart J 2003; 44: 645-654) Key words: Heart rate variability, Diurnal variation, Aortic surgery, General anesthesia, Myocardial ischemia, Troponin T STABILITY over a period of up to four months and reproducibility of HRV and its diurnal rhythm have been demonstrated in healthy adults and patients with From the

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Section: Discussionmentioning

confidence: 99%

Diminished Circadian Rhythm of Heart Rate Variability After Aortic Surgery Appears to Be Independent of Myocardial Ischemia

Dworschak¹,

Lorenzl

Rapp

2003

Jpn Heart J

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“…However, single reports from experimental studies are available. For example, Fleisher et al [27] demonstrated that the decreased temperature was associated with the increased VLF power spectrum…”

Section: Discussionmentioning

confidence: 99%

Physiological Reaction to Work in Cold Microclimate

Bortkiewicz

Gadzicka²,

Szymczak³

et al. 2006

International Journal of Occupational Medicine and Environmental Health

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Objectives: In Poland, occupational exposure to cold microclimate is quite common (5.1 workers/1000 occupationally active people). Reports on health effects of this exposure are rather scarce. The aim of the study was to evaluate the physiological reaction in workers occupationally exposed to cold microclimate. Materials and Methods: Examinations were performed in a group of 102 workers (41 women and 61 men) employed at cold storage units. The mean age in the group was 39.1 ± 9.9 years and the duration of employment under conditions of cold environment was over 12 years. The study population was divided into four groups, according to microclimate conditions (group I, ambient temperature -26°C; group II, 10-14°C; group III, 18-20°C, control group; and group IV, 0-10°C). The workers underwent the following procedures: general medical examinations, cold pressor test, ambulatory blood pressure monitoring, and heart rate variability (HRV) analysis (time-and frequency-domain parameters). Results: The results were adjusted for confounding factors (age, smoking and drinking habits). The analysis of HRV parameters did not reveal any significant differences between the study groups. However, systolic and diastolic blood pressure (BP) in the daytime and at night was significantly higher in group IV compared to group II. Mean heart rate (HR) in the daytime and at night and the BP and HR day/night ratio did not differ between the groups. The analysis of BP by gender revealed that in women, systolic BP during the day and at night was significantly higher in group IV than in group II. In the group of workers with hypertension (18 men and 5 women), men reacted to the cold pressor test either by increased or decreased BP while all the women reacted by the increased BP. Conclusions: Our findings indicated that in workers exposed to cold microclimate, the physiological reaction was dependent on gender and ambient temperature. Women seemed to be more sensitive to cold stress than men. However, this finding must be further investigated.

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“…Fleisher et al [31]showed that power at very low frequencies increases when reducing the core temperature of normal subjects, but remains unchanged when skin temperature is increased or decreased, thus suggesting a specific thermoregulatory influence on this component related to core hypothermia. To our knowledge, no data on the change of very-low-frequency power at increase of core temperature exist.…”

Section: Discussionmentioning

confidence: 99%

Cardiac Autonomic Function in Patients Suffering from Primary Focal Hyperhidrosis

Birner

Heinzl²,

Schindl³

et al. 2000

Eur Neurol

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Cardiac autonomic function in patients (n = 63) with primary focal hyperhidrosis and healthy controls (n = 28) was investigated by short-term frequency domain power spectral analysis of heart rate variability. The power of the very-low-frequency band (0.01–0.05 Hz) was significantly lower in patients with axillary hyperhidrosis than in controls. No differences between groups could be observed at investigation of the low-frequency band (0.05–0.15 Hz), which was a surprising finding because this band represents also sympathetic cardiac innervation. At the high-frequency band (0.15–0.5 Hz), which represents parasympathetic cardiac innervation, an interaction of type and position influencing spectral power was detected. Our highly interesting findings indicate that primary focal hyperhidrosis is based on a much more complex autonomic dysfunction than generalised sympathetic overactivity and seems to involve the parasympathetic nervous system as well.

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Thermoregulation and Heart Rate Variability

Cited by 112 publications

References 34 publications

Diminished Circadian Rhythm of Heart Rate Variability After Aortic Surgery Appears to Be Independent of Myocardial Ischemia

Diminished Circadian Rhythm of Heart Rate Variability After Aortic Surgery Appears to Be Independent of Myocardial Ischemia

Physiological Reaction to Work in Cold Microclimate

Cardiac Autonomic Function in Patients Suffering from Primary Focal Hyperhidrosis

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