[2025-10-01T17:46:10.989496] [QUERYOME] Starting research for query 361: 'Instructions:
 Answer the question below. First, respond with the single best option letter (A, B, C, or D). Then provide a concise reasoning (1–3 sentences). Use both the retrieved evidence and your own medical knowledge to choose the most accurate answer.

Question:
ECG shows a mean axis of 90 degrees. In which of the following would be present the maximum voltage of R wave?

Options:
A. III
B. I
C. aVF
D. aVL'
[2025-10-01T17:46:11.030247] [PI] Starting research for query: 'Instructions:
 Answer the question below. First, respond with the single best option letter (A, B, C, or D). Then provide a concise reasoning (1–3 sentences). Use both the retrieved evidence and your own medical knowledge to choose the most accurate answer.

Question:
ECG shows a mean axis of 90 degrees. In which of the following would be present the maximum voltage of R wave?

Options:
A. III
B. I
C. aVF
D. aVL'
[2025-10-01T17:46:11.032468] Saving text to bench_final/run1/medmcqa/medmcqa_1921/pi_initial_prompt.txt
[2025-10-01T17:46:11.038372] [PI] Calling o3 for initial analysis...
[2025-10-01T17:46:19.672626] [PI] Reasoning iteration 1
[2025-10-01T17:46:19.674232] [PI reasoning] **Clarifying ECG Mean Axis**

I need to address the mean electrical axis of 90 degrees, which indicates that the vector is directed inferiorly, aligning with aVF. The normal hexaxial reference shows Lead I at 0°, Lead II at +60°, Lead III at +120°, aVF at +90°, aVL at -30°, and aVR at -150°. Since the axis most aligned with the mean vector has the highest R wave amplitude, the correct answer is aVF (option C). It’s straightforward physiology, but I’ll keep in mind the possibility of citing a standard ECG reference if needed.
[2025-10-01T17:46:19.676918] [PI] Executing function call 1: hybrid_search
[2025-10-01T17:46:19.678588] [PI] Function arguments: {'query': 'mean electrical axis 90 degrees corresponds to lead aVF highest R wave', 'k': 5, 'faiss_weight': 0.7, 'bm25_weight': 0.3, 'use_rrf': True}
[2025-10-01T17:46:19.681134] Saving JSON to bench_final/run1/medmcqa/medmcqa_1921/pi_iteration_1_tool_call_2_hybrid_search.json
[2025-10-01T17:46:21.365084] [PI] Function hybrid_search executed successfully
[2025-10-01T17:46:21.367414] Saving JSON to bench_final/run1/medmcqa/medmcqa_1921/pi_iteration_1_tool_result_2_hybrid_search.json
[2025-10-01T17:46:21.386562] [PI] Continuing reasoning with 1 function responses...
[2025-10-01T17:46:27.365341] [PI] Reasoning iteration 2
[2025-10-01T17:46:27.367227] [PI] No function calls found in response
[2025-10-01T17:46:27.368912] [PI] No more function calls - research complete
[2025-10-01T17:46:27.371124] Saving text to bench_final/run1/medmcqa/medmcqa_1921/pi_final_answer.txt
[2025-10-01T17:46:27.389887] [QUERYOME] Query completed successfully
