[Correlation of extracorporeal shock wave lithotripsy with mean arterial blood pressure and heart rate in patients with kidney stones]

Background: At present, although more than 90% of renal stones are treated at a success rate of 68-86% with extracorporeal shock wave lithotripsy [ESWL], complications such as the possible occurrence of hypertension are attributed to application of this technique

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Objective: The purpose of this study was to determine the correlation of ESWL with the mean arterial blood pressure and heart rate

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Methods: This analytical study was performed on 75 patients with kidney stones in Mashhad using non-probability and purposeful sampling. Blood pressure was measured at three stages before, during, and after lithotripsy in the supine position. The relationship between ESWL- related hypertension and autonomic neural activity was also evaluated by heart rate spectral analysis. Data was analyzed with t-test and one-way analysis of variance

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Findings: The mean arterial blood pressure increased from 93.30 +/- 9.73 to 98.30 +/- 12.63 in men and from 87.82 +/- 11.08 to 96.08 +/- 14.51 mmHg in women during lithotripsy and the difference was found to significant, statistically [P<0.001]. The incidence of diastolic pressure >/= 100 mmHg in patients with diastolic pressure less than 90 mmHg prior to lithotripsy was 7.5%

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Conclusion: These results indicate the risk of hypertension during lithotripsy however, the possible occurrence of hypertension following lithotripsy needs more prospective studies