Miscellaneous Electrocardiographic Topics

Left bundle branch block: A rare ECG manifestation of hyperkalemia

“…Hyperkalemia produces a biphasic effect on arterio-venous (AV) conduction system, with mild hyperkalemia accelerating the AV conduction, and severe hyperkalemia (7.5 mEq/L) depressing it. 3 A high concentration of extracellular potassium slows impulse conduction through all cardiac tissue, which accounts for a number of ECG findings.…”

“…Poor correlation has been observed between serum potassium levels and any specific ECG finding and the sensitivity of ECG for diagnosis of hyperkalemia is poor. [1][2][3] At the same time, any ECG change in the clinical background of hyperkalemia should alert the clinician for carrying out the work-up for diagnostic confirmation. We report the occurrence of LBBB caused by hyperkalemia in a young lady with Chronic kidney disease (CKD).…”