Quantitative radiocardiography in major pulmonary thromboembolism

Area of Science:

• Cardiology
• Radiology
• Pulmonary Medicine

Background:

• Major pulmonary thromboembolism (PTE) poses significant mortality risks.
• Accurate diagnosis and risk stratification are crucial for patient management.

Purpose of the Study:

• To evaluate quantitative radiocardiography for diagnosing PTE.
• To assess the utility of measuring pulmonary blood volume index (PVBI) and cardiac index (CI) in PTE patients.
• To determine if these measurements can predict mortality and monitor disease resolution.

Main Methods:

• Quantitative radiocardiographic studies were performed on 37 patients with confirmed major PTE.
• Radioactive 113mindium and a scintillation probe were used to measure PVBI and CI.
• Serial determinations of PVBI were conducted in survivors to assess resolution rates.

Main Results:

• Mean PVBI was significantly reduced in PTE patients (185 ml/sq m) compared to normal (310 ml/sq m).
• Low CI (less than 2.7 L/min/sq m) was the most significant correlate of mortality, observed in 47% of patients.
• Survivors showed a mean increase in PVBI of 27 ml/day, indicating disease resolution.

Conclusions:

• Quantitative radiocardiography is effective in diagnosing major PTE by detecting decreased PVBI.
• PVBI and CI measurements aid in assessing PTE severity and predicting mortality risk.
• This technique allows for monitoring the resolution rate of PTE.