Correlation between Perfusion Index and Left Ventricular Output in Healthy Late Preterm Infants.

OBJECTIVE: The perfusion index (PI) is a noninvasive marker derived from photoelectric plethysmographic signals in pulse oximetry in the evaluation of peripheral perfusion. This study was aimed to determine the correlation between PI and left ventricular output (LVO) in healthy late preterm infants at 48th hour of life. STUDY DESIGN: With new generation pulse oximeter (MASIMO Rad 7 Oximeter) pre- and post-ductal PI values were recorded from healthy late preterm babies at the 48th hour of life. PI was determined simultaneously with LVO as measured by transthoracic echocardiography. RESULTS: A total of 50 late preterm babies were included in the study. The mean gestational age of the cases was 35.4 ± 0.7 weeks and the birth weight was 2,586 ± 362 g. Mean pre- and post-ductal PI values at the postnatal 48th hour of babies' life were found to be 2.0 ± 0.9 and 1.7 ± 1.1. The mean LVO value was 438 ± 124, LVO/kg 175 ± 50. When the LVO value was normalized according to the babies' body weight, there was no statistically significant correlation between the pre- and post-ductal PI and the LVO/kg value (r <0.2, p >0.05 in both comparisons). CONCLUSION: There was no correlation between pre- and post-ductal PI and LVO values in healthy late preterm infants. This may be due to the failure of the LVO, a systemic hemodynamic parameter, to accurately reflect microvascular blood flow due to incomplete maturation of the sympathetic nervous system involved in the regulation of peripheral tissue perfusion in preterm babies. KEY POINTS: · No correlation found between PI and LOV in preterm babies.. · LVO cannot adequately reflect peripheral blood flow.. · Sympathetic nervous system is immature in preterm infants..

Medial collateral ligament bursitis in a patient with knee osteoarthritis.

BACKGROUND: Medial collateral ligament (MCL) bursitis has been described as a distended and inflamed bursa between the superficial and deep portions of the MCL. It is a rare but important cause of medial knee pain. CASE DESCRIPTION: A 65-year-old woman with knee osteoarthritis (OA) presented with severe pain and swelling in her left knee. She did not have a traumatic injury. After a clinical examination, a slight decrease in the range of motion of the left knee, and a painful swelling and tenderness over the medial side of the knee and proximal tibia were detected. The pain was exacerbated by valgus stress test. The magnetic resonance (MR) imaging showed a distended bursa with internal septations beneath the superficial portion of the MCL. MCL bursitis was considered as diagnosis and an ultrasound-guided corticosteroid injection into the bursa was performed. RESULTS: There was a significant improvement in pain intensity in the follow-up examination. A repeated MR imaging 2 months later showed a marked improvement, and approximation of the deep and superficial portions of the MCL. CONCLUSIONS: MCL bursitis, which is a rare condition, must be considered for the differential diagnosis of increased medial knee pain in patients with knee OA. Corticosteroid injection is an effective and safe treatment modality for the management.