Sağlıklı Çocuklarda Kalp Hızı Değişkenliği

ÖZET Amaç: Kalp hızı değişkenliği (KHD), kalbin otonomik fonksiyon durumunu değerlendirmede kullanılan noninvaziv bir yöntemdir. Bu çalışmanın amacı, sağlıklı çocuklarda kalp hızı değişkenliğini değerlendirmekti. Gereç ve Yöntem: 51 sağlıklı çocuk çalışmaya dahil edildi. Tüm olguların KHD, 24 saatlik Holter görüntüleme verileri kullanılarak değerlendirildi. KHD, beş zaman bağımlı (SDNN, SDNN-indeks, SDANN, RMSSD, pNN50) ve dört frekans bağımlı (LF, HF, VLF, LF/HF oranı) indeksler hesaplanarak ölçüldü. Bulgular: Çalışmaya dahil edilen 51 sağlıklı çocuğun yaş ortalamaları 10.78 ± 3.80 yıl (yaş aralığı 4-17 yıl) idi. Kız ve erkek cinsiyeti arasında kalp hızı parametrelerinde istatistiksel olarak anlamlı farklılık tespit edilmedi. KHDnin SDNN, SDNN-indeks, SDANN-indeks, LF, VLF, total güç parametreleri, yaş ile anlamlı pozitif korelasyon gösterdi (r:0.301, p:0.032; r:0.278 p:0.048; r:0.335 p:0.016; r:0.334 p:0.017; r:0.361 p:0.009; r: 0.321 p:0.021; sırasıyla). Vücut kitle indeksi ve kalp hızı değişkenliği parametreleri arasında korelasyon saptanmadı. Sonuç: Vagal aktiviteyi gösteren kalp hızı değişkenliği parametreleri kız ve erkek çocuklar arasında anlamlı farklılık göstermedi. Çocuklarda KHD parametrelerinin çoğunluğu yaş arttıkça artmıştır. Noninvaziv bir yöntem olan KHD, olası kardiyak aritmi riskini değerlendirmek için kullanılabilir.

Heart Rate Variability in Healthy Children

Objective: Heart rate variability (HRV) is a noninvasive method used to assess the status of autonomic function of the heart. The aim of this study was to evaluate HRV in healthy children. Material and Method: 51 healthy children were included in the study. HRV of all subjects were evaluated using the data in 24 hours Holter monitoring. HRV was measured by calculating five time-domain (SDNN, SDNN-indeks, SDANN, RMSSD, pNN50), and four frequency-domain (LF, HF, VLF, LF/HF ratio) indices. Results: The mean age of 51 healthy children included in the study was 10.78 ± 3.80 years (range 4-17 years). There was no statistically significant difference in the heart rate parameters detected between females and males. SDNN, SDNN-index, SDANN, LF, VLF, total power parameters of the heart rate variability showed a significant positive correlation with age (r:0.301, p:0.032; r:0.278 p:0.048; r:0.335 p:0.016; r:0.334 p:0.017; r:0.361 p:0.009; r: 0.321 p:0.021; respectively).There was no correlation detected between body mass index and the parameters of HRV. Conclusion: HRV parameters denoting vagal activity did not show significantly difference between female and male children. The majority of HRV parameters increased with increasing age. HRV which is a noninvasive method could be used to evaluate the risk of the possible cardiac arrhythmia.

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