<prompt> Heart block is seen in -HypermagensemiaHypomagnesemiaHypernatremiaHypocalcemia  <response>: Ans. is i.e., Hypermagnesemia o Hypermagnesemia slows the heart and leads to heart block.o Hypomagesemia leads to cardiac arrhythmias like SVT and VT.HypermagnesemiaHypomagnesemiaInhibits PTH releaseInhibits calcium reabsorptionResistance to PTHDecreased production of vitamin D3Vasodilation : HypotensionTetanyNeuromuscular blockade : DTK inhibitedVertigoataxianystagmusRespiratory failure : Decreased respiratory rateDepression-psychosisBowel sounds reducedileus Pupils dilated Heart rate decreasedHeart rate increasedECG : PR, qRS and QT prolongationPR and QT prolongation with T wave inversion 