What are the advantages of clock position method to determine fetal heart axis for inexperienced resident physicians? A comparative study

Objective: Residency training programs are challenging for young physicians with heavy workloads. Although ultrasonography (USG) is an imaging method that is frequently used in obstetrics practice, some basic USG skills can be acquired late in this intensive learning process. Likewise determining the fetal heart axis is an elementary evaluation but can turn into a challenging and time-consuming process, especially for inexperienced clinicians. Material and Methods: Pregnant women between 20 and 37 weeks of gestation were recruited. Two observers assessed the axis of fetal heart by standard, Bronshtein and clock position methods. Fetal heart axis evaluation times were compared. Inter-observer and intra-observer agreements of the three methods were measured. One factor learning rates were calculated. Results: A total of 31 pregnant patients between the ages of 18 and 40 years were included in the study. Fetal heart axis evaluation time by the clock position method was shorter than the Bronshtein and standard method in both observers. Furthermore diagnostic accuracy for both observers was 100% with the clock position method, while this fell to 100% in observer-1 and 96.8% in observer-2 using the Bronshtein method. The clock position method was learned faster than either of the other methods. Conclusion: Clock position method is an easy and feasible method for inexperienced resident physicians in terms of learning and application to determine the fetal heart axis. The advantages of this method increase when patient numbers are higher.