Perbedaan Cardiothoracic Ratio (CTR) Normal antara Proyeksi Standar Foto Toraks dengan Proyeksi Anterio-Posterior (AP) Supine Ekspirasi Maksimal
Abstract: Cardiothoracic Ratio
(CTR) is used to determine the widening of the heart in radiology measurement.
CTR is measured by comparing the heart width to cavum thoracales in thorax PA
projection. However, not all patients can be examined by chest X-ray
examination with standard position (PA erect, maximal inspiration) because of
the ambulatory defect that make the patient can not stand in erect position.
Unfortunately, clinicians need the information about it. There is a different
normal index between CTR in standard position of chest X-ray and AP projection,
supine and maximal expiration. The aim after study is to determine the
difference between CTR index in chest X-ray PA erect, maximal inspiration with
AP projection supine, maximal expiration. This was a cross sectional study
conducted in Radiology Installation Dr. Sardjito Hospital, Jogjakarta on August
to October 2008. Subjects that recruited in this study have no radiologic
abnormalities, the radiograph Thorax result were examined and recorded in PA
erect and AP supine projection. Then measurement of the CTR done in those two
projection . Data were analyzed by a comparative descriptive method that
compared the mean value in PA erect and AP supine group using independent
sample t-test. From 150 subjects, 74 were men (49.3 %) and 76 were women
(50.7%). Mean age between these subject were 39.8 + 12.42 years old. The ratio of CTR in PA erect
projection, maximal inspiration was 0.43 ± 0.03 and in AP supine projection
0.52 ± 0.03 (p<0.05; CI 95%). The differences of CTR index in standard
position (PA erect, maximal
inspiration) with AP supine, maximal expiration projection were 0,09. Result:
found that CTR index of AP supine projection was< 0.59 similar with CTR index PA erect
projection (<0.5). The study implies that CTR index AP supine projection may
be used for patient who could not perform chest X-ray PA erect projection.
Penulis: Prasetyo Budi Dewanto
Kode Jurnal: jpkedokterandd090056
